مسرد بيئي M

المعجم البيئي مشروع قيد الإنجاز يحتاج ترجمة وإضافات

A - B - C - D - E - F - G - H - I - J - K - L - M - N - O - P - Q - R - S - T - U - V - W - X - Y - Z

m3 See “cubic meter (m3).”
mA Milliampere.
MacerAcer™ Screenings conditioning equipment by Brackett Geiger.
macerate To chop or tear.
Macho Monster® In-channel sewage grinder by JWC Environmental.
MacPac Chemical feed package by Milton Roy Co.
Macro-Cat Ion exchange resin by Sybron Chemicals, Inc.
macroencapsulation Isolation of waste by embedding or surrounding it with a material that acts as a barrier between the waste and air, water, or other materials.
macro.oc Destabilized .oc particle that is too large to penetrate a granular media .lter bed.
macrofouling The biological fouling of a water system with macroorganisms including clams, barnacles, and mussels.
Macrolite® Ceramic .lter media by Kinetico Engineered Systems, Inc.
macroorganisms All organisms larger than microscopic and visible to the unaided eye.
macrophyte A type of macroscopic plant life.
macroporous resin An ion exchange resin with a high resistance to oxidation and organic fouling used primarily in applications with high molecular weight organic matter.
macroreticular resin An ion exchange resin having a pore structure even after drying.
macroscopic Capable of being seen with the naked eye.

MACT See “maximum achievable control technology (MACT).”
MACTherm® Regenerative oxidizer by Applied Regenerative Technologies Co.
MADAM Methacryloyl ethyl dimethyl amine.
MAF Million acre feet.
Magicblock™ Fluid control system by Osmonics, Inc.
Magna Rotor aerator by Lakeside Equipment Corp.
Magna Cleaner™ Liquid cyclone by Andritz-Ruthner, Inc.
Magna.oc® Coagulant aid by Ciba Specialty Chemicals
Magnasol® Inorganic and organic coagulant products by Ciba Specialty Chemicals
MagneClear® Magnesium hydroxide water treatment products by Martin Marietta Specialties, Inc.
magnetite A black, iron oxide mineral also known as “lodestone.”
Magni.oc® Polyelectrolyte used to enhance liquid/solid separation by Cytec Industries, Inc.
Magnum Ultraviolet disinfection equipment by Atlantic Ultraviolet Corp.
Magnum® Belt .lter press by Parkson Corp.
Magnum™ Catalytic oxidizer by Megtec Systems, Inc.
Magox® Magnesium oxide by Premier Chemicals.
Mahr™ Mechanically cleaned bar screen by Headworks, Inc.
makeup water Fluid introduced in a recirculating stream to maintain an equilibrium of temperature, solids concentration, or other parameter(s).
malathion A common organophosphate insecticide.
M-alkalinity See “methyl orange alkalinity.”
Mallard Bridge-mounted clari.er scum removal system by NSW Corp. (U.S.) and Copa Group (U.K.).
malodor An odor which causes annoyance or discomfort to the public and which has been determined to be objectionable.
Mammoth® Brush aerator by USFilter/Zimpro.
mandatory recycling Programs which by law require consumers to separate trash so that some or all recyclable materials are recovered for recycling rather than going to land.lls.
manganese greensand See “greensand.”
Manganex Process Manganese greensand .ltration process by Roberts Filter Group.
Manhattan Process High rate .ltration process by Roberts Filter Group.
manhole See “personnel access opening.”
manifest A form used to identify the origin, quantity, and composition of a hazardous waste during its transportation from the point of generation to the point of .nal treatment or disposal.
manifest system Tracking of hazardous waste from generation through disposal with accompanying documents known as manifests.
mannich polymer Sludge conditioning polymer produced by using a formaldehyde catalyst to promote a chemical reaction to create the organic compound.
Manning’s formula Formula used to measure .ow in an open channel based on the cross-sectional area of the .owing stream and the hydraulic radius, slope, and roughness of the channel.

manometer A u-tube device .lled with a liquid used to measure pressure differ
entials in liquids or gases. Manor® Filter press by Simon-Hartley, Ltd. Manu-Matic Manual pressure leaf .lter cleaning system by USFilter Corp. Manver Chemical composition used in analysis of water hardness by Hach Co. Manville Filtration Former name of Celite Corp. manway See “personnel access opening.” MARD™ Motor-actuated rotary distributor for trickling .lters by USFilter/Gen
eral Filter. marine sanitation device Any equipment or process installed on board a vessel
to receive, retain, treat, or discharge sewage. Marox Pure oxygen wastewater treatment system by USFilter/Zimpro. MARS Membrane-controlled biological wastewater treatment technology by
USFilter/Krüger. marsh gas Methane gas produced by the anaerobic decomposition of organic
matter in wetland areas. Also called “swamp gas.” marshland An area of soft wet land vegetated by reeds and grasses. masking The blocking out or covering of a sound or smell with another. Maspac® Plastic packing media by Clarkson Controls & Equipment Co. mass balance An analysis that delineates changes that take place in a reactor or system
by quantifying system inputs and outputs. Also known as “material balance.” mass burn Solid waste incineration of garbage with a minimum of pretreatment
or sorting. mass loading The total amount of mass of a constituent .owing into a system. mass spectrometer An instrument used for the analysis of organic materials in envi
ronmental samples by sorting ions according to their masses and electrical charges. Master-Flo Bladder pump by American Sigma, Inc. material balance See “mass balance.” Material Safety Data Sheet (MSDS) Data sheet containing descriptive informa
tion required by OSHA for hazardous materials. materials recovery facilities (MRFs) A central facility where recycled materials are prepared and sorted. maturation pond An aerobic waste stabilization pond used for polishing treated
wastewater ef.uent. MAX™ Reverse osmosis system product line by USFilter. MaxAir™ Wide band coarse bubble diffuser by Environmental Dynamics Inc. Max.o™ Mixer by S&N Airo.o, Inc. Maxi-Flo® Pressurized sand .lter product line by USFilter Corp. Maxim® Seawater conversion evaporator by Beaird Industries, Inc. Maximizer Dewatering sludge press by Goodnature Products, Inc. MaxiMizer® Solid bowl centrifuge by Alfa Laval Separation, Inc. maximum achievable control technology (MACT) The level of air pollution
control technology required by Clean Air Act.
maximum contaminant level (MCL) The maximum permissible level of a contaminant in water delivered to the free .owing outlet of the ultimate user of a public water system.

maximum contaminant level goal (MCLG) The maximum level of a contaminant, including an adequate safety margin, at which no known or anticipated adverse effect on human health would occur.
maximum residual disinfectant level (MRDL) The maximum level of disinfectant added for treatment that may not be exceeded at a consumer’s tap without the possibility of adverse health effects.
Maxipress Former name of J-Belt belt .lter press by USFilter/Dewatering Systems.
Maxi-Rotor Rotary brush aerator by USFilter/Krüger.
MaxiSep Oil/water separator by Hydro-Flo Technologies, Inc.
Maxi-Strip® Hydraulic venturi stripper for VOC removal by Hazleton Environmental, Inc.
Maxi-Tank™ Tank sump by Hazleton Environmental, Inc.
Maxi-Yield™ Polymer blending system by USFilter/Wallace & Tiernan.
Max-Load™ Cartridge .lter by Ronningen-Petter.
Max-Pak™ Plastic packing media by Jaeger Products, Inc.
Maz-O-Rator Solids grinder by Robbins & Myers, Inc.
MBAS See “methylene blue active substance (MBAS).”
MBBR™ Moving bed bio.lm reactor by Waterlink Biological Systems.
MBR See “membrane bioreactor (MBR).”
MBS® Molecular bonding system to stabilize heavy metals by Solucorp Industries Corp.
Mc® Propeller .owmeter by McCrometer, Inc.
MCC Motor control center.
McGinnes-Royce Manufacturer of screening equipment whose product line was acquired by USFilter/Rex & Link-Belt Products.
MCL See “maximum contaminant level (MCL).”
MCLG See “maximum contaminant level goal (MCLG).”
m-ColiBlue24™ Laboratory coliform test broth by Hach Co.
MCRT See “mean cell residence time (MCRT).”
MDI Metered dose inhaler.
MDL See “method detection limit.”
MDTOC Minimum detectable threshold odor concentration.
ME Multiple effect. See “multiple effect distillation.”
me See “milliequivalent (me).”
mean cell residence time (MCRT) The average time that a microbial cell remains in an activated sludge system. It is equal to the mass of cells divided by the rate of cell wasting from the system.
mean .ow The arithmetic average .ow at a given point for a speci.ed period of time.
mean sea level (MSL) The average sea level for all stages of the tide.
mean velocity The average velocity of a .uid .owing in a channel, pipe, or duct, determined by dividing the discharge by the cross sectional area of the .ow.
meander One of a naturally occurring series of bends or curves in a river, usually formed on a .oodplain composed of unconsolidated alluvium.
meander belt The outermost limits of a .oodplain along which a stream meanders.
MEB Multiple effect boiling. See “multiple effect distillation.”

mechanical aeration The mechanical agitation of water to promote mixing with
atmospheric air. mechanical coupling A pipe coupling that does not require threading. mechanical draft cooling tower A cooling tower that depends on fans for intro
duction and circulation of its air supply.
mechanically emulsi.ed oil A classi.cation of a free oil and water mixture subjected to severe turbulence where the oil droplets are in a range of 10 to 40 microns in size.
MECO® Mechanical Equipment Co., Inc.
Mectan™ Grit chamber by John Meunier, Inc.
MED See “multiple effect distillation (MED).”
media Granular .ltration or absorption material or ion exchange resin products

used to form barriers to the passage of certain solids or molecules that are suspended or dissolved in water or wastewater. “Media” is the plural form of “medium.”
medical waste Any solid waste generated in the diagnosis, treatment, or immuni
zation of humans or animals. Medina® Bioremediation products by Medina Products Bioremediation Division. medium The material used in a .lter to form a barrier to the passage of certain
suspended solids or dissolved molecules. medium-size water system A water system that serves 3300 to 50,000 persons. Megacell™ Rectangular dissolved air .otation system by Krofta Engineering Corp. megaliter (ML) A unit of volume equal to 1 million liter. Megatron™ Ultraviolet water puri.cation system by Atlantic Ultraviolet Corp. Megos® Ozone generation system by Capital Controls Co. MEK Methyl ethyl ketone. Mekor® Corrosion inhibitor chemical additive by Ashland Chemical, Drew Industrial. Mella.er Inclined plate clari.er by Industrial Filter & Pump Mfg. Co. melt water Water derived from the melting of ice and snow. meltdown A defect in a nuclear reactor cooling system which results in an over
heating of the reactor core and eventual melting of fuel rods. melting point The temperature at which a solid changes to a liquid. Mem*Recon™ Reverse osmosis membrane reconditioning product by King Lee
Technologies. Membio® Aerobic biological digester by USFilter/Memcor. Membralox® Ceramic membrane .lters by USFilter/Rockford. Membrana™ Cartridge .lter housing by Osmonics. membrane A thin barrier that permits passage of particles of a certain size or of
a particular physical or chemical property.
membrane bioreactor (MBR) A modi.cation of the activated sludge wastewater treatment process employing membrane .ltration in place of conventional secondary clari.ers.
membrane contactor A device that permits mass transfer between a gaseous phase and liquid phase of a material without dispersing one phase into another. membrane diffuser Fine bubble aeration diffuser with perforated .exible plastic membranes.

membrane .lter (1) A paper-like .lter with small pore sizes that is capable of retaining bacteria for use in the laboratory examination of water. (2) A pressure-driven micro.ltration or ultra.ltration membrane .lter.
membrane processes Processes including reverse osmosis, electrodialysis, and ultra.ltration that use membranes to remove dissolved material or .ne solids.
membrane softening A water softening process that utilizes semi-permeable nano.ltration or reverse osmosis membranes to remove hardness constituents such as calcium and magnesium from water.
MembraPro® Ceramic membrane micro.ltration system by USFilter Corp.
Membrastill™ Pharmaceutical water system by USFilter/Rockford.
Memclean® Chemical solution used to clean micro.ltration membranes and systems by USFilter/Memcor.
Memcor® Continuous micro.ltration systems by USFilter/Memcor.
Memexx™ Membrane .ltration system by WesTech Engineering Inc.
Memloy Micro.ltration membrane product by USFilter/Memcor.
Memory-Flex™ Check valve by Val-Matic Valve & Manufacturing Corp.
Memstor Membrane storage agent by King Lee Technologies.
Memtec Micro.ltration product line by USFilter/Memcor.
Memtek® Micro.ltration membrane products by USFilter/Industrial Wastewater Systems.
Memtrex™ Pleated .lters by Osmonics, Inc.
Memtrol Micro.ltration control system by USFilter/Memcor.
meniscus The curved upper surface of a column of liquid.
Mensch™ Reciprocating rake bar screen by Vulcan Industries, Inc.
MeOH Common abbreviation for “methanol.”
MEP See “multiple extraction procedure (MEP).”
meq/L See “milliequivalents per liter.”
mercaptans Organic compounds, or thioalcohols (thiols), containing sulfur and noted for their disagreeable odor.
Merco® Centrifuge by Alfa Laval Separation, Inc.
mercury A heavy metal element that when absorbed or ingested by humans is excreted from the body very slowly and can be lethal in very low concentrations.
Merlin® Progressing cavity pump by MGI Pumps, Inc.
Mer-Made Filter leaves for vacuum diatomite .lters by Mer-Made Filter, Inc.
Mesa-Line® Portable submersible pump by Crane Pumps & Systems.
mesh The number of openings per lineal inch, measured from the center of 1 wire or bar to a point 1. (25.4 mm) distant.
mesocosm A physically con.ned, self-maintaining, multitrophic experiment for discerning processes involved in the fate and transformation of nutrients into organic matter.
mesophiles Bacteria that grow best at temperatures between 25 and 40°C.
mesophilic digestion Anaerobic sludge digestion within a mesophilic range of approximately 25 to 40°C.
mesophyte A plant that grows under typical or moderate amounts of atmospheric water supply.
mesosphere The level of the earth’s atmosphere that exists above the stratosphere.

mesothelioma A fatal form of cancer caused by exposure to asbestos.
mesotrophic lake A lake between the oligotrophic and eutrophic stages that remains aerobic, although a substantial depletion of oxygen has occurred in the hypolimnion.
metabolism The chemical and physical processes of living organisms which include the biological conversion of organic matter to cellular matter and gaseous byproducts.
metabolites Any substances produced by biological processes, such as those from pesticides.
MetaGuard™ Powdered antiscalant and stabilizer for reverse osmosis systems by Professional Water Technologies, Inc.
metal In general those elements that easily lose electrons to form positive ions.
metal .nishing wastes Wastewater from electroplating, galvanizing, and other metal .nishing operations that may be characterized by the presence of acids, caustics, and metal contaminants.
metal salt coagulants Salts of alum and iron commonly used as water treatment coagulants.
Metal-Drop™ Flocculant/coagulant by Kem-Tron.
metalimnion The middle layer of a thermally strati.ed lake or reservoir.
MetalWeave® Stainless steel fabric tank baf.es by Baker Process.
metastasis The spreading of disease from one part of the body to another.
meter The basic SI unit of length equivalent to approximately 39.37 inches, or the distance traveled by light in a vacuum in 1/299,792,458 seconds. Also called “metre.”
metering pump A pump used to provide controlled injection of a chemical additive into a .uid .ow.
metes and bounds A description of the measurements and boundaries of a tract of land beginning at a given point in the boundary of the tract to be described, then the recitation of the courses (directions) and distances from point to point entirely around the tract.
Metex® An anaerobic process for the removal of heavy metals by Lotepro Corp. (Western Hemisphere) and Linde-KCA-Dresden GmbH.
methane A colorless, odorless combustible gas that is the principle byproduct of anaerobic decomposition of organic matter in wastewater. Chemical formula is CH4.
methane formers See “methanogens.”
methanogens Group of anaerobic bacteria responsible for conversion of organic acids to methane gas and carbon dioxide. Also known as “methane formers.”
methanol A solvent often used as a supplemental carbon source during denitri.cation. Chemical formula is CH3OH.
methemoglobinemia Disease occurring primarily in infants who ingest water high in nitrates. Also called “blue baby syndrome.”
Method 18 An EPA test method which uses gas chromatographic techniques to measure the concentration of volatile organic compounds in a gas stream.

Method 24 An EPA reference method to determine density, water content, and total volatile content of coatings.
Method 25 An EPA reference method to determine the VOC concentration in a gas stream.
method detection limit (MDL) The constituent concentration that when processed through the complete method produces a sample with a 99% probability that it is different from the blank.
methoxychlor Pesticide that causes adverse health effects in domestic water supplies and is toxic to freshwater and marine aquatic life.
methyl The monovalent hydrocarbon radical CH3, usually existing only in combination with other atoms.
methyl orange A color indicator used in acid and base titrations.
methyl orange alkalinity A measure of the total alkalinity of an aqueous solution determined through titration with a methyl orange color indicator.
methylate To replace one or more hydrogen atoms in a molecule with a methyl group.
methylene blue active substance (MBAS) Anionic surfactants which react with methylene blue to form a chloroform-soluble complex.
Metito Arabia Former name of USFilter/Metito.
metre See “meter.”
metric ton A unit of mass equal to 1000 kilogram or approximately 2204 pounds. Also called “tonne.”
Metrol™ Seawater injection product line by Baker Hughes Process Systems.
MEVA Product line of Waterlink Inc.
MF See “micro.ltration (µF).”
MFS Minimum functional speci.cation.
MFT Membrane .lter technique.
mg See “milligram (mg).”
mg/L See “milligrams per liter.”
mg/L as CaCO3 See “calcium carbonate equivalent (mg/L as CaCo3).”
mgd Million gallons per day.
mgid Million gallons (Imperial) per day.
mho Unit of measurement for conductivity equal to the reciprocal of resistivity (ohm).
MHSA Mine Health Safety Administration.
MHT® Magnesium hydroxide by Dow Chemical Co.
miasma Vapor rising from marshes, polluted water, or decaying organic matter which was once mistakenly thought to poison and infect the air causing malaria and other diseases.
MIB Abbreviation for the trace organic 2-methylisoborneol which produces an earthy/musty odor in surface waters. Chemical formula is C11H20O.
MIC® Mazzei Injector Corp.
Micrasieve™ Pressure-fed .ne static screen by Andritz-Ruthner, Inc.
Micro Fine Ultra.ltration system by USFilter/Memcor.
Micro/2000® Residual chlorine, chlorine dioxide, and potassium permanganate analyzer by USFilter/Wallace & Tiernan.

microbe An organism observable only through a microscope. Also called “microorganism.” microbial pesticide A microorganism that is used to control a pest, but of mini
mum toxicity to man. Microbics Former name of Azur Environmental. microbiocide See “biocide.” MicroBiotic™ Carbon bio.ltration system by Geoenergy International Corp. Microbloc Carbon bed VOC control system by USFilter/Westates. Micro-Carbon® Filter cartridge with wound carbon batt by USFilter/Filtration &
Separation. Microcat® Microbial additive for use in biological wastewater treatment by Bio
science, Inc. Microchem™ Tablet chlorinator by Mooers Products, Inc. microclimate The localized climate conditions within an urban area or neighbor
hood. MicroDAF Dissolved air .otation by the former Princeton Clearwater. microelectronic water See “electronic-grade water.” microencapsulation Isolation of a waste material by mixing it with a material
which then cures or converts to a solid, nonleaching barrier. Microenfractionator™ Soil mixing technology by H&H Eco Systems, Inc. microfauna Animals not visible to the naked eye. MicroFIBR Skid-mounted bio.ltration system by AMETEK Rotron Bio.ltration. MicroFID™ Portable FID by PerkinElmer Instruments. micro.ltration (MF) A low pressure (100-400 kPa, 15-60 psi) membrane .ltra
tion process which removes suspended solids and colloids generally larger
than 0.1 micron diameter. Micro.oat® Dispersed air .otation system by Aeration Industries, Inc. micro.oc Destabilized .oc particle that permits in-depth penetration of a granular
media .lter bed to optimize the .lter’s solid retention capacity. Micro.oc® Water treatment product line of USFilter/Micro.oc. microfouling The biological fouling of a water system with microorganisms
including algae, fungi, and bacteria. Microgap™ Ozonation equipment by Osmonics, Inc. microgram (µg) A unit of mass equal to one-millionth of a gram. micrograms per cubic meter (µg/m3) A measure of the concentration of partic
ulate or gaseous matter in air, commonly used in reporting air pollution data. micro-irrigation A water management irrigation technique using a micro-sprinkler or drip irrigation system to minimize water runoff. Micro-Klean™ Wastewater treatment equipment product by Alar Engineering
Corp. MicroMass Dissolved air .otation unit by Komline-Sanderson Engineering Corp. Micro-Matic® Rotating microscreen by USFilter/Industrial Wastewater Systems. MicroMAX® Physical separation system by Micronair LLC. Micromesh Strainer Microscreen by Lakeside Equipment Corp. micrometer (µm) See “micron (µ).” micromho A unit measure of conductivity equal to one millionth of a mho.

micron (µ) A unit of length equal to one-millionth of a meter. Also called “micrometer.” micron rating The term applied to a .lter medium to indicate the particle size above which all suspended solids will be removed throughout the rated capacity. Micronizer™ Fine bubble dissolved air .otation device by the former Microlift Systems, Inc. microorganism An organism observable only through a microscope. Also called “microbe.” Micro-Pi® Pressure fed rotary screen by Andritz-Ruthner, Inc. (Western Hemi
sphere) and USFilter/Contra-Shear. Micro-Polatrol® Cathodic protection power units by Corrpro Waterworks, Inc. MicroPore Aeration mixing systems by Environmental Dynamics Inc. MicroPurge® Low-.ow sampling by QED Environmental Systems, Inc. microscope An instrument used for visual magni.cation of small objects. microscreen A surface .ltration device consisting of a rotating drum with a .ne
mesh screen .xed to its periphery. As water .ows through the interior of the
drum, solids are retained by the mesh for removal by a high pressure spray wash. Microsep® Ballasted Floc Reactor by USFilter/General Filter. Micro-Sieve Microscreen formerly offered by Passavant. microsporidia Spore-forming protazoan parasites recognized as pathogens of
insects, .sh, birds, and mammals. microstrainer See “microscreen.” Micro-T Turbidimeter with remote station monitoring by HF Scienti.c, Inc. Microtox® Acute toxicity test by Azur Environmental. Microtuff™ Microporous, vibrating diffuser by Clear-Flo International. Microza™ Hollow .ber membrane .ltration systems by Pall Corp. midge .y An insect that may infest a water system and whose larvae, known as
“blood worms,” feed on algae, protozoans, and decaying vegetation. Midi-Rotor Rotary brush aerator by USFilter/Krüger. midnight dumping The deliberate and illegal disposal of sludge or other waste
materials at an unauthorized, nonpermitted location. MightyPure™ Ultraviolet water puri.cation system by Atlantic Ultraviolet Corp. mil A unit of measure equal to one-thousandth of an inch. MIL Military Speci.cation. milk of lime A lime slurry formed by mixing water with calcium hydroxide. mill To grind or crush. mill scale An oxide coating formed on steel when heated in connection with hot
working or heat treatment. Millennium™ Regenerative thermal oxidizer system by Megtec Systems, Inc. milliequivalent (me) One-one thousandth of an equivalent weight. milliequivalents per liter (meq/L) An expression indicating the concentration of
a solute which is calculated by dividing the concentration in milligrams per
liter by the equivalent weight of the solute. milligram (mg) A unit of mass equal to one-thousandth of a gram. milligrams per liter (mg/L) A common unit of measurement of the concentration
of a material in solution.

milliliter (mL) A unit of volume equal to one cubic centimeter. Milliscreen™ Internally fed rotary .ne screen by Andritz-Ruthner, Inc. (Western Hemisphere) and USFilter/Contra-Shear. mineral A naturally occurring inorganic material having a de.nite chemical composition and structure. mineral acidity Acidity caused by the presence of hydrochloric, sulfuric, nitric,
and other inorganic mineral acids. mineral acids Inorganic acids including hydrochloric, nitric, and sulfuric acid. mineral water Water containing a minimum of 250 mg/L of total dissolved solids
and which come from a source tapped at one or more boreholes or springs originating from a geologically and physically protected underground source. mineralization The conversion of an organic material to an inorganic form by
microbial decomposition. Mini Monster® Low wastewater .ow solids reduction unit by JWC Environmental. Mini Osec Electrolytic chlorination system by USFilter/Wallace & Tiernan. MiniBUS™ Ultra.ltration membrane cartridge by Cuno Separations Systems
Division. MiniChamp Chemical induction unit by USFilter/Stranco. MiniDisk™ Cloth media wastewater .lter by Aqua-Aerobic Systems, Inc. Minigas® Multi-gas detector by Neotronics of North America. Mini-Ject® Pneumatic ejector lift station by Smith & Loveless, Inc. Mini-Magna Rotor aerator by Lakeside Equipment Corp. Minimax Dewatering pressure .lter by Larox Inc. Mini-Maxi Dissolved air .otation unit by Tenco Hydro, Inc. Mini-Milli™ Internally fed rotary .ne screen by Andritz-Ruthner, Inc. (Western
Hemisphere) and USFilter/Contra-Shear. Mini-Miser™ Multiple feed dewatering system by Recra Environmental. Minipure™ Ultraviolet water puri.cation system by Atlantic Ultraviolet Corp. Mini-Ring Random packing media by USFilter/General Filter. Mini-San Tablet feeder disinfection system by Exceltec International Corp. Miniseries™ Packaged desalination plant by Matrix Desalination, Inc. minors Publicly owned treatment works with .ows less than 1 million gallons per
day. Minotaur™ Activated carbon product by Calgon Carbon Corp. Miox® Oxidant product line by Miox Corp. miscible Capable of being mixed. MIST Fine bubble diffuser by Aeromix Systems, Inc. mist eliminator A device used to remove entrained droplets of water from a vapor
stream produced during evaporation. Mist Pro™ Odor control system by NuTech Environmental Corp. MistGard™ Oil mist collector by Monsanto Enviro-Chem Systems, Inc. Mist-Master® Mesh pad mist eliminators by ACS Industries, Inc. mitigation Measures taken to reduce adverse impacts on the environment. mitochondria Subcellular structures that contain genetic material and enzymes
which produce ATP to provide energy for cell metabolism. Mixaerator Static mixing aerators by JDV Equipment Corp.

MixAirTech MixAir Technologies, Inc.
Mixco Batch mixer by Lightnin.
mixed bed demineralizer Ion exchange demineralizer containing strong-acid and strong-base resins in a single vessel.
mixed liquor The mixture of wastewater and activated sludge undergoing aeration in the aeration basin.
mixed liquor suspended solids (MLSS) Suspended solids in the mixture of wastewater and activated sludge undergoing aeration in the aeration basin.
mixed liquor volatile suspended solids (MLVSS) The volatile fraction of the mixed liquor suspended solids.
mixed low-level radioactive waste (MLLW) Low-level radioactive waste that also contains hazardous constituents.
mixed media .lter Granular media .lter utilizing two or more types of .lter media of different sizes and speci.c gravities, usually silica sand, anthracite and ilmenite, or garnet.
Mix.o™ Aeration injection and dissolution system by Praxair, Inc.
mixing zone Limited area where initial dilution of a discharge takes place, water quality changes may occur, and certain water quality standards may be exceeded.
Mix-Mate® Multistage polymer mixing system by Neptune Chemical Pump Co.
mixotroph Bacteria that do not grow in either anaerobic or highly oxygenated water.
ML See “megaliter (mL).”
mL See “milliliter (mL).”
MLLW See “mixed low-level radioactive waste (MLLW).”
MLM™ Heat recovery media for regenerative thermal oxidation systems by Lantec Products, Inc.
MLSS See “mixed liquor suspended solids (MLSS).”
MLTSS Mixed liquor total suspended solids. See “mixed liquor suspended solids (MLSS).”
MLVSS See “mixed liquor volatile suspended solids (MLVSS).”
mobile source Any nonstationary source of air pollution such as cars, trucks, motorcycles, buses, airplanes, locomotives.
MobileFlow® Mobile water treatment system by Ecolochem, Inc.
MobileRO Trailer mounted reverse osmosis system by Ecolochem, Inc.
Mobius Fine mesh belt screen by Pro-Ent, Inc.
modeling A quantitative or mathematical simulation which attempts to predict or describe the behavior or relationships that result from a physical event.
MoDo-Chemetics Former name of Kvaerner Chemetics.
Mod-U-Flo Round bottom clari.er by Osmonics, Inc.
Modu.ow Concrete gravity sand .lter by Smith & Loveless, Inc.
Modulab® High purity water systems by USFilter Corp.
Modular Aquarius® Modular water treatment plant by USFilter/Micro.oc.
Modulozone Skid-mounted ozone generator by Praxair-Trailigaz Ozone Co.
Modu-Plex Wet well pump station by Smith & Loveless, Inc.
ModuStor™ Bolted steel tank by ModuTank, Inc.
MOE Margin of exposure.

molality The number of moles of solute per kilogram of solvent.
molarity The number of moles of solute per liter of solution.
mole (1) The molecular weight of a substance containing an Avogadro’s number of atoms or molecules. (2) A massive harborwork, breakwater, or jetty.
molecular weight The weight of a molecule that may be calculated as the sum of the atomic weights of its constituent atoms.
molecular weight cutoff (MWCO) The smallest compounds that are generally rejected in a membrane .ltration process.
molecule The smallest division of a compound that still retains or exhibits all the properties of the substance.
mollusk A group of invertebrate animals with a soft, unsegmented body protected by a shell.
Molpure® Hollow .ber .ltration membranes by Celgard LLC.
Molsep® Hollow .ber .ltration membranes by Celgard LLC and Daicen Membrane Systems Ltd.
molten salt reactor A thermal treatment unit that rapidly heats waste in a heat-conducting .uid bath of carbonate salt.
Molyver Reagent chemicals used to determine molybdenum concentration in water by Hach Co.
MOM Management, operating, and maintenance.
monel A nickel alloy containing approximately 30% copper and having good mechanical and corrosion-resistant properties.
monitoring well A well used to obtain samples for analysis or to measure groundwater levels.
Monkey Screen Reciprocating rake bar screen by Brackett Geiger.
Mono® Pump products by Mono.o.
Monobelt® Filter press by Waterlink/Aero-Mod Systems.
Monoblock Carbon bed VOC control system by USFilter/Westates.
Monocluster Package water treatment plant by Graver Co.
Monod equation A mathematical equation that describes the relationship between biomass production and the concentration of growth-limiting substrate.
Mono-Ferm Iron and manganese removal gravity .lter by Graver Co.
mono.lament A single synthetic .ber of continuous length used in woven mesh or cloth.
mono.ll A solid waste disposal facility containing only one type or class of waste.
Mono.o Progressing cavity pump by MGI Pumps, Inc.
Mono.o® Screenings grinder by Mono.o.
Mono-Floc® Gravity sand .lter with coagulant feed system by Graver Co.
Mono.or® Cast-in-place .lter underdrain by In.lco Degremont, Inc.
Monolift® Vertical, progressing cavity groundwater pump by Mono.o.
monolithic underdrain A concrete .lter underdrain whose piers and .oor are poured in place at one time.
monomedia .lter A granular media .lter utilizing a single size and type of .lter media.
monomer The basic molecule of a synthetic resin or plastic.

monomictic Relatively deep lakes and reservoirs which do not freeze over during the winter months and undergo a single strati.cation and mixing cycle during the year.
Mono-Pak Concrete gravity .lter by Graver Co.
Mono-Pilot® Coagulant control center using a pilot .lter column by USFilter/Micro.oc.
Monorake Traveling bridge raking mechanism for rectangular clari.ers by GL&V/Dorr-Oliver, Inc.
Monoscour® High solids gravity sand .lter by Graver Co.
MonoSparj Coarse bubble diffuser by Walker Process Equipment.
Monosphere™ Ion exchange resin by Dow Chemical Co.
Monovalve® Filter Gravity sand .lter by Graver Co.
Monozone® Ozone generation system by Capital Controls Co.
Montreal Protocol A 1987 international agreement to phase out CFCs and replace them with HFCs. The full agreement name is the “Montreal Protocol on Substances That Deplete the Ozone Layer.”
moraine A mass of stone and earth carried by a glacier and deposited on land after a glacier recedes.
morbidity Rate of disease incidence.
mortality rate The number of deaths per 100,000 people in a population.
MOS Margin of safety.
most probable number (MPN) Statistical analysis technique based on the number of positive and negative results when testing multiple portions of equal volume.
mother liquor The concentrated solution that remains after evaporation or crystallization. See also “bittern.”
motive steam High pressure steam used to operate a steam-jet ejector or thermocompressor.
MotoDip Motorized slotted skimmer pipe by Walker Process Equipment.
mouth feel A series of sensations such as aftertaste, astringent, burning, chalky, metallic, and .at which are usually easier to taste than to smell but cannot be strictly described as “tastes.”
moving bed .lter A granular media .lter that continuously cleans and recycles .lter media while the .lter continues to operate.
Moyno® Pump product line by Moyno Industrial Products.
MP Melting point.
MPA Microscopic particulate analysis.
MPN See “most probable number (MPN).”
MPRox Process Organic destruction process for spent caustic wastewaters by MPR Services, Inc.
MPVT™ Multi-purpose vertical turbine pump by Patterson Pump Co.
MQL Method quantitation limit. Generally the same as “estimated quantitation limit.”
MRDL See “maximum residual disinfectant level (MRDL).”
MRDLG Maximum residual disinfectant level goal.

MRF Press Belt .lter press by Idreco USA, Ltd.
MRFs See “materials recovery facilities (MRFs).”
MRL Maximum residue limit.
M-roy Metering pump products by Milton Roy Co.
MS Diffuser Medium bubble diffuser by Enviroquip, Inc.
MSBR Modi.ed sequencing batch reactor.
MSD Musculoskeletal disorder.
MSDS See “Material Safety Data Sheet (MSDS).”
MSF See “multistage .ash evaporation (MSF).”
MSF-BR Multistage .ash evaporation, brine recirculation.
MSF-OT Multistage .ash evaporation, once-through.
MSL Mean sea level.
MSW Municipal solid waste.
MSWLF Municipal solid waste land.ll.
MT® Reverse osmosis membrane cleaners by B.F. Goodrich Co.
MTBE Methyl-tertiary-butyl-ether.
MTBF Mean time between failures.
MTD Maximum tolerated dose.
MTP Maximum trihalomethane potential.
MTS Wastewater treatment equipment product link of Waterlink Biological Systems.
MTS® Trailer-mounted mobile treatment system for industrial wastewater treatment applications by Graver Co.
MTTR Mean time to repair/replace.
MTZ Mass transfer zone.
MUC Maximum use concentration.
muck soils Earth made from decaying plant materials.
MUD Municipal Utility District.
mud balls Agglomerations of .oc, solids, and .lter media in a .lter bed which may grow into a larger mass and reduce .ltration ef.ciency.
mud .at A muddy, .at low-lying tidal area.
mud valve A valve used to drain sediment from the bottom of a sedimentation basin.
Muf.n Monster® Wastewater solids reduction unit by JWC Environmental.
muf.er A device used to reduce or deaden noise.
mulch A protective ground covering of compost, wood chips, sawdust, or other organic matter.
Multdigestion Two-stage digestion system formerly offered by Dorr-Oliver, Inc.
Multicell® Multiple cell gravity .lter by USFilter/General Filter.
Multi-Chem® NOx destruction system by Tri-Mer Corp.
multiclone A set of individual cyclone separators arranged in parallel to remove particulate matter from air emissions.
Multicoil Indirect sludge drying system by Kvaerner Eureka USA.
Multicone Aluminum induction cascade aerator used to strip gases or aerate water supply by In.lco Degremont, Inc.
Multicrete® Monolithic .lter underdrain system by USFilter/General Filter.

MultiDraw Circular clari.er with pumped suction sludge removal system using
multiple nozzles by Walker Process Equipment. Multi.o Flow distribution nozzle for rotary distributors by Amwell, Inc. Multi.o® Pump column used with jet aeration system by USFilter/Jet Tech. MultiFlow Skid mounted water treatment system by Ecolochem, Inc. Multi-Flow PVC biological .lter media formerly offered by B.F. Goodrich Co. Multi-Jet™ Submersible self-aspirating aerator by Waterlink Biological Systems. Multilogger Water instrumentation device for measuring multiple parameters by
Stevens Water Monitoring Systems. Multi-Mag™ Electromagnetic .owmeter by Marsh-McBirney, Inc. multimedia .lter Granular media .lter utilizing two or more types of .lter media
of different sizes and speci.c gravities, usually silica sand, anthracite and
ilmenite, or garnet. Multi-Pack™ Oil/water coalescers by Mercer International, Inc. Multipass® Sludge dryer by USFilter/Envirex. Multiple Barrier Filtration Filtration system by USFilter/General Filter. multiple effect distillation (MED) A thin .lm evaporation process where the
vapor formed in a chamber, or effect, condenses in the next, providing a heat source for further evaporation. multiple extraction procedure (MEP) Procedure used to simulate the leaching a waste will undergo from repetitive precipitation of acid rain on a material. multiple hearth furnace A furnace or incinerator consisting of numerous hearths
which is used to incinerate organic sludges or recalcinate lime. multiple stage .ash evaporation See “multistage .ash evaporation (MSF).” Multi-Point Level controller by Drexelbrook Engineering Co. Multiport Valve™ Valve used to manipulate .lter backwashing and rinsing by
USFilter/Rockford. MultiRanger Level and volume measurement device by Milltronics, Inc. multistage .ash evaporation (MSF) A desalination process where a stream of
brine .ows through the bottom of chambers, or stages, each operating at a successively lower pressure, and a proportion of it .ashes into steam and is then condensed.
Multi-Tech® Chemical feed, contact .occulation, and .ltration process by USFil
ter/General Filter. Multi-Turi® Wet scrubber with high energy venturi by CMI-Schneible Co. Multiwash® Sand .ltration process using combined air/water backwash by USFil
ter/General Filter. Multi-Wash® Wet scrubber by CMI-Schneible Co. Multi-Zone Anaerobic digestion system by USFilter/Zimpro. Muncher® Sewage grinder products by Mono.o. Munchpump® Packaged pump/grinder assembly by Mono.o. municipal waste The combined solid and liquid waste from residential, commer
cial, and industrial sources. municipal wastewater treatment plant Treatment works designed to treat municipal wastewater.

Muni.o Positive displacement rotary lobe sludge pump by Envirotech Pumpsystems. Munox Bacterial innoculant for wastewater treatment, soil, and groundwater reme
diation by Osprey Biotechnics. Münster Trash rake cleaning mechanism by Landustrie Sneek BV. muntz metal A brass containing approximately 60% copper and 40% zinc. muriatic acid Chemical formula is HCl, also known as “hydrochloric acid.” MUS Minimum ultimate strength. Mushroom Ventilator Cast iron air diffuser by the former Knowles Mushroom
Ventilator Co. mutagen A material that causes genetic change when interacting with a living
organism. mutagenic A chemical or agent with properties that cause mutation or dis.guring. Mutrator® Packaged pumping/grinding station by Mono.o. MVC Mechanical vapor compression. See “vapor compression evaporation (VC).” MVR Mechanical vapor recompression. See “vapor compression evaporation
(VC).” MW Megawatt. MWCO See “molecular weight cutoff (MWCO).” Mx® Magmeter by McCrometer, Inc. Mycelx® Chemical coating with an af.nity for organic compounds by Mother
Environmental Systems, Inc. mycotoxin A toxin produced naturally by molds or fungus. Mystaire® Air scrubber systems by Misonix, Inc

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