Aqua-TrimM Tray-type air stripper by Delta Cooling Towers, Inc quaTurbo Surface aerator and mixer products by AquaTurbo Systems Aquavap Vapor compression type evaporator by Licon, Inc Aqua-View Particle measuring system by Particle Measuring Systems, Inc Aquaward Tablet feeder disinfection system by Exceltec International Corp Aquazur V Rapid sand gravity filter by Infilco Degremont, Inc. aqueduct A conduit for carrying running water. aqueous Something made up of, similar to, or containing water. aqueous chlorine Term used to describe chlorine or chlorine cor solved in water, often mistakenly called"liquid chlorine. aqueous solution A solution in which water is the solvent. aquiclude A low-permeability underground rock formation that absorbs water slowly but will not allow its free passage aquifer A subsurface geological formation containing a large quantity of water. aquifuge An underground layer of impermeable rock that will not allow the free passage of groundwater Aquilair' Oxidation process for removal of voC compounds from wastewater by USFilter/Kruger(North America) and OTV. AQuirm Sulfide control product by USFilter/Davis Process AquorM Potassium permanganate by Nalon Chemical, distributed by American International Chemical. Inc. Land capable of being farmed Applicable or relevant and appropriate requirements. Cleanup standards control standards and other substantive environmental protection requirements, Arc Screen TM Self cleaning curved bar screen by Infilco Degremont, unr vs criteria, and limitations promulgated under federal, state, and local lay ARCC American Rivers Conservation Council Archimedes' principle The principle of buoyancy which states that the force on a submerged body acts vertically upward through the center of gravity of the displaced fluid and is equal to the weight of the fluid displaced Archimedes’ screw pump See“ screw pump archipelago A group or chain of many islands. arctic Characteristic of the region, climate, or vegetation north of the Arctic Circle Arctic Circle An imaginary circle parallel to the equator at latitude 6634 north Arcticaer High speed surface aerator with submersible motor by USFilter/Aerator area source Any small source of non-natural air pollution that is released over a relatively small area but which cannot be classified as a point source, including vehicles and other small engines, small businesses and household activities Argo Scientific Former name of BetzDearborn-Argo District ARI Sulfur recovery and odor control product line by USFilter/Gas Technologies ARI See"average rainfall intensity(ARD) AriaN Water treatment system by Pall Corp Aries Filtration air scour technology by roberts Filter Group. arithmetic mean The sum of a set of observations divided by the number of observations
Aqua-Trim™ Tray-type air stripper by Delta Cooling Towers, Inc. AquaTurbo® Surface aerator and mixer products by AquaTurbo Systems. Aquavap Vapor compression type evaporator by Licon, Inc. Aqua-View Particle measuring system by Particle Measuring Systems, Inc. Aquaward® Tablet feeder disinfection system by Exceltec International Corp. Aquazur V® Rapid sand gravity filter by Infilco Degremont, Inc. aqueduct A conduit for carrying running water. aqueous Something made up of, similar to, or containing water. aqueous chlorine Term used to describe chlorine or chlorine compounds dissolved in water, often mistakenly called “liquid chlorine.” aqueous solution A solution in which water is the solvent. aquiclude A low-permeability underground rock formation that absorbs water slowly but will not allow its free passage. aquifer A subsurface geological formation containing a large quantity of water. aquifuge An underground layer of impermeable rock that will not allow the free passage of groundwater. Aquilair® Oxidation process for removal of VOC compounds from wastewater by USFilter/Krüger (North America) and OTV. AQuit™ Sulfide control product by USFilter/Davis Process. Aquox™ Potassium permanganate by Nalon Chemical, distributed by American International Chemical, Inc. arable Land capable of being farmed. ARAR Applicable or relevant and appropriate requirements. Cleanup standards, control standards and other substantive environmental protection requirements, criteria, and limitations promulgated under federal, state, and local laws. Arc Screen™ Self cleaning curved bar screen by Infilco Degremont, Inc. ARCC American Rivers Conservation Council. Archimedes’ principle The principle of buoyancy which states that the force on a submerged body acts vertically upward through the center of gravity of the displaced fluid and is equal to the weight of the fluid displaced. Archimedes’ screw pump See “screw pump.” archipelago A group or chain of many islands. arctic Characteristic of the region, climate, or vegetation north of the Arctic Circle. Arctic Circle An imaginary circle parallel to the equator at latitude 66°34′ north. Arcticaer High speed surface aerator with submersible motor by USFilter/Aerator Products. area source Any small source of non-natural air pollution that is released over a relatively small area but which cannot be classified as a point source, including vehicles and other small engines, small businesses and household activities. Argo Scientific Former name of BetzDearborn-Argo District. ARI Sulfur recovery and odor control product line by USFilter/Gas Technologies. ARI See “average rainfall intensity (ARI).” Aria™ Water treatment system by Pall Corp. Aries™ Filtration air scour technology by Roberts Filter Group. arithmetic mean The sum of a set of observations divided by the number of observations
Arm& Hammer Sodium bicarbonate by Church Dwight Co Inc. Armco Former sluice gate manufacturer acquired by Hydro Gate Corp Arna Ultraviolet disinfection system by Arlat, Inc aromatics A group of hydrocarbon compounds, including benzene, containing a closed ring structure array (1)A staged arrangement of membrane elements in a system. (2)A group of solar collection devices arranged in a suitable pattern to efficiently collect Arro-Care Reverse osmosis maintenance and support services by USFilter/Rock Arro-Cleaning Membrane care services by USFilter/Rockford Arrowhead Water treatment product line by USFilter/Rockford arroyo A stream or watercourse that is often di ARSM Air regulated siphon by John Meunier, Inc arsenic A naturally occurring element that is toxic to humans at very low levels Chemical formula is as Artco Applied Regenerative Technologies Co artesian water Bottled water from a well that taps a confined aquifer which is located above the normal water table artesian well A well with sufficient pressure to produce water without pumping rthropod Any of the largest phylum of invertebrate animals including insects nd crustaceans having segmented bodies, exoskeletons, and jointed legs ngn pairs. Arus Andritz Former name of Andritz-Ruthner. Inc. ASA Algae sweep automation system by Ford Hall Co, Inc ASB Aerated stabilization basin asbestos A mineral fiber, positively identified as a carcinogen, that does not con duct heat or electricity and formerly in wide use in the building industry for thermal insulation, soundproofing, roofing, and electrical insulation asbestos cement pipe Pipe manufactured of a mixture of asbestos fiber and port asbestos-containing material Construction materials that contain more than one percent asbestos. asbestos-containing waste materials(ACWM) Mill tailings or any waste that contains commercial asbestos and is generated by a source covered by the Clean air Act Asbestos neshaps asbestosis A chronic lung disease caused by exposure or inhalation of asbestos as-built drawings The original plans and specifications prepared for construction d corrected to reflect how a facility was actually built or installed. A-scale sound level(dBA) A modification of the decibel scale that approximates the sensitivity of the human ear used to note the instensity or annoyance of noise pollution. ASCE American Society of Civil Engineers Asdor Former name of USFilter/Asdor
Arm & Hammer® Sodium bicarbonate by Church & Dwight Co. Inc. Armco Former sluice gate manufacturer acquired by Hydro Gate Corp. Arna® Ultraviolet disinfection system by Arlat, Inc. aromatics A group of hydrocarbon compounds, including benzene, containing a closed ring structure. array (1) A staged arrangement of membrane elements in a system. (2) A group of solar collection devices arranged in a suitable pattern to efficiently collect solar energy. Arro-Care® Reverse osmosis maintenance and support services by USFilter/Rockford. Arro-Cleaning® Membrane care services by USFilter/Rockford. Arrowhead® Water treatment product line by USFilter/Rockford. arroyo A stream or watercourse that is often dry. ARS™ Air regulated siphon by John Meunier, Inc. arsenic A naturally occurring element that is toxic to humans at very low levels. Chemical formula is As. arsenicals Pesticides containing arsenic. Artco Applied Regenerative Technologies Co. artesian water Bottled water from a well that taps a confined aquifer which is located above the normal water table. artesian well A well with sufficient pressure to produce water without pumping. arthropod Any of the largest phylum of invertebrate animals including insects and crustaceans having segmented bodies, exoskeletons, and jointed legs occurring in pairs. Arus Andritz Former name of Andritz-Ruthner, Inc. ASA Algae sweep automation system by Ford Hall Co., Inc. ASB Aerated stabilization basin. asbestos A mineral fiber, positively identified as a carcinogen, that does not conduct heat or electricity and formerly in wide use in the building industry for thermal insulation, soundproofing, roofing, and electrical insulation. asbestos cement pipe Pipe manufactured of a mixture of asbestos fiber and Portland cement. asbestos-containing material Construction materials that contain more than one percent asbestos. asbestos-containing waste materials (ACWM) Mill tailings or any waste that contains commercial asbestos and is generated by a source covered by the Clean Air Act Asbestos NESHAPS. asbestosis A chronic lung disease caused by exposure or inhalation of asbestos fibers. as-built drawings The original plans and specifications prepared for construction and corrected to reflect how a facility was actually built or installed. A-scale sound level (dBA) A modification of the decibel scale that approximates the sensitivity of the human ear used to note the instensity or annoyance of noise pollution. ASCE American Society of Civil Engineers. Asdor Former name of USFilter/Asdor
ASDWa Association of State Drinking Water Administrators aseptic The state of being free of pathogenic organisms ash The nonvolatile inorganic solids that remain after incineration Ashaire Aerator product line by USFilter/Aerator Products Ashbrook-Simon-Hartley Former name of Ashbrook Corp. Ashfirm a process to stabilize heavy metals in sludge and ash by Ashland Chem ical. Drew Industrial ASHRAE American Society of Heating, Refrigeration, and Air Conditioning Asiatic clam A fresh water clam originally found in Southeast Asia and introduced n the U.s. in 1938 ASME American Society of Mechanical Engineers Aspergillus fumigatus Airborne fungi that may result from composting opera asphalt-rubber A mixture of ground rubber and bituminous concrete used as a pavement interlayer to reduce stress and prevent cracking asphyxiant A vapor or gas such as carbon monoxide that can cause unconscious- ness or death by suffocation. Aspi-JettM Aspirating aerator by Aqua-Aerobic Systems, Inc. aspirating aerator Aeration device using a motor driven propeller to draw atmo- spheric air into the turbulence caused by the propeller to cause the formation small bubbles aspirator A hydraulic device that creates a negative pressure by forcing liquid through a restriction and increasing the velocity head. AsQC American Society for Quality Control ASR See"atmosphere supplying respirator(ASR) assay A test for a particular chemical or effect. assigned protective factor(APF) Respirator designation indicating how much contaminant will be reduced with proper respiratory fit and wear. An APF of 5 indicates that if a cubic meter of air contains 10 mg of contaminant, the effective exposure would be 10/5 or 2 mg/cu m assimilable organic carbon(AoC) The portion of dissolved organic carbon that is easily used by microbes n sourc assimilation The ability of a body of water to purify itself of pollutants. assimilative capacity The ability of a water body to receive wastewater and materials without deleterious effects on aquatic life or the humans who AST Aboveground storage tanks ASTM American Society for Testing and Materials Astrasand Continuously cleaned sand filter by Astraco Water Engineering Astraseparator Inclined plate settler by Astraco Water Engineering asymmetric membrane Membranes that are not reversible and can only desai- nate efficiently in one direction Asymmetrirm Membrane cartridge filter by USFilter/Filtration Separation AT Ozone generator by Ozonia North America. ATAD See"autothermal thermophilic aerobic digestion(ATAD)
ASDWA Association of State Drinking Water Administrators. aseptic The state of being free of pathogenic organisms. ash The nonvolatile inorganic solids that remain after incineration. Ashaire Aerator product line by USFilter/Aerator Products. Ashbrook-Simon-Hartley Former name of Ashbrook Corp. Ashfix™ A process to stabilize heavy metals in sludge and ash by Ashland Chemical, Drew Industrial. ASHRAE American Society of Heating, Refrigeration, and Air Conditioning Engineers. Asiatic clam A fresh water clam originally found in Southeast Asia and introduced in the U.S. in 1938. ASME American Society of Mechanical Engineers. Aspergillus fumigatus Airborne fungi that may result from composting operations which may cause human ear, lung, and sinus infections. asphalt-rubber A mixture of ground rubber and bituminous concrete used as a pavement interlayer to reduce stress and prevent cracking. asphyxiant A vapor or gas such as carbon monoxide that can cause unconsciousness or death by suffocation. Aspi-Jet™ Aspirating aerator by Aqua-Aerobic Systems, Inc. aspirating aerator Aeration device using a motor driven propeller to draw atmospheric air into the turbulence caused by the propeller to cause the formation of small bubbles. aspirator A hydraulic device that creates a negative pressure by forcing liquid through a restriction and increasing the velocity head. ASQC American Society for Quality Control. ASR See “atmosphere supplying respirator (ASR).” assay A test for a particular chemical or effect. assigned protective factor (APF) Respirator designation indicating how much contaminant will be reduced with proper respiratory fit and wear. An APF of 5 indicates that if a cubic meter of air contains 10 mg of contaminant, the effective exposure would be 10/5 or 2 mg/cu m. assimilable organic carbon (AOC) The portion of dissolved organic carbon that is easily used by microbes as a carbon source. assimilation The ability of a body of water to purify itself of pollutants. assimilative capacity The ability of a water body to receive wastewater and toxic materials without deleterious effects on aquatic life or the humans who consume the water. AST Aboveground storage tanks. ASTM American Society for Testing and Materials. Astrasand® Continuously cleaned sand filter by Astraco Water Engineering. Astraseparator® Inclined plate settler by Astraco Water Engineering. asymmetric membrane Membranes that are not reversible and can only desalinate efficiently in one direction. Asymmetrix™ Membrane cartridge filter by USFilter/Filtration & Separation. AT® Ozone generator by Ozonia North America. ATAD See “autothermal thermophilic aerobic digestion (ATAD)
Atara Former manufacturer of digester gas mixing equipment whose product line was acquired by Infilco Degremont, Inc ATDIM Autotherm aerobic sludge digestion system by CBI Walker, Inc. Athos Wet air oxidation process by USFilter/Kruger(North America) and OTV ATI Analytical Technology, Inc aTL Aero Tec laboratories Inc Atlantes Chemical Systems Former name of Hoffland Environmental, Inc ATLASM Advanced technology lagoon aeration system by Environmental atm See“ atmosphere atmometer An instrument used to measure the evaporative capacity of the air. atmosphere (1) The gaseous region that surrounds the earth. (2)A unit of pressure equal to 1.0333 kg/sq cm or 14.7 psi. Abbreviated"atm. atmosphere supplying respirator(Asr) A respirator which supplies air or oxy gen to the user. atmospheric corrosion Corrosion resulting from exposure to the atmosphere atmospheric pressure The force exerted by the weight of the atmosphere above the point of measurement. At sea level, this pressure equals 101.3 kPa (14.7 psi), 760 mm(29.9 inches)of mercury column, or 10.3 m(33. 9 feet)of ater column Atochem Former name of elf Atochem North america inc. atoll A circular reef enclosing a shallow lagoon atom The smallest unit of an element that retains the characteristics of that element Atomeratora Pressure aerator for iron oxidation by USFilter/General Filter atomic absorption spectrophotometry(Aa) A highly sensitive instrumental technique for measuring trace quantities of elements in water atomize To divide a liquid into extremely fine particles atomizer An instrument through which a liquid is sprayed to ce a fine mist ATP (1) Average transmembrane pressure. (2)See"adenosine triphosphate (ATP). (3)See"advanced treatment plant(ATP) ATPTM Aerobic thermophilic process sludge treatment system by CBI Walker, Inc ATSM Sorbent media product line by Engelhard Corp ATSDR Agency for Toxic Substances and Disease Registry. attached growth process See"fixed film process attainment area A geographic area in which the levels of a criteria air pollutant meet the health-based National Ambient Air Quality Standard for that pollutant. attenuation The process by which a compound is reduced in concentration over time through absorption, adsorption, degradation, dilution, and/or transformation. attractant A chemical or agent that lures insects or other pests by stimulating their sense of smell AU See"animal unit (AU Auger Monster Modular screen/grinder/solids removal unit for wastewater head works system by JWC Environmental Aurora UVTM Ultraviolet disinfection system by Calgon Carbon Corp Austgen-Biojet Former name of ABJ product group of Sanitaire Corp AutosM Stack sampling system by Andersen Instruments, Inc
Atara Former manufacturer of digester gas mixing equipment whose product line was acquired by Infilco Degremont, Inc. ATD™ Autotherm aerobic sludge digestion system by CBI Walker, Inc. Athos Wet air oxidation process by USFilter/Krüger (North America) and OTV. ATI Analytical Technology, Inc. ATL® Aero Tec Laboratories, Inc. Atlantes Chemical Systems Former name of Hoffland Environmental, Inc. ATLAS™ Advanced technology lagoon aeration system by Environmental Dynamics Inc. atm See “atmosphere.” atmometer An instrument used to measure the evaporative capacity of the air. atmosphere (1) The gaseous region that surrounds the earth. (2) A unit of pressure equal to 1.0333 kg/sq cm or 14.7 psi. Abbreviated “atm.” atmosphere supplying respirator (ASR) A respirator which supplies air or oxygen to the user. atmospheric corrosion Corrosion resulting from exposure to the atmosphere. atmospheric pressure The force exerted by the weight of the atmosphere above the point of measurement. At sea level, this pressure equals 101.3 kPa (14.7 psi), 760 mm (29.9 inches) of mercury column, or 10.3 m (33.9 feet) of water column. Atochem Former name of Elf Atochem North America, Inc. atoll A circular reef enclosing a shallow lagoon. atom The smallest unit of an element that retains the characteristics of that element. Atomerator® Pressure aerator for iron oxidation by USFilter/General Filter. atomic absorption spectrophotometry (AA) A highly sensitive instrumental technique for measuring trace quantities of elements in water. atomize To divide a liquid into extremely fine particles. atomizer An instrument through which a liquid is sprayed to produce a fine mist. ATP (1) Average transmembrane pressure. (2) See “adenosine triphosphate (ATP).” (3) See “advanced treatment plant (ATP).” ATP™ Aerobic thermophilic process sludge treatment system by CBI Walker, Inc. ATS™ Sorbent media product line by Engelhard Corp. ATSDR Agency for Toxic Substances and Disease Registry. attached growth process See “fixed film process.” attainment area A geographic area in which the levels of a criteria air pollutant meet the health-based National Ambient Air Quality Standard for that pollutant. attenuation The process by which a compound is reduced in concentration over time, through absorption, adsorption, degradation, dilution, and/or transformation. attractant A chemical or agent that lures insects or other pests by stimulating their sense of smell. AU See “animal unit (AU).” Auger Monster® Modular screen/grinder/solids removal unit for wastewater headworks system by JWC Environmental. Aurora UV™ Ultraviolet disinfection system by Calgon Carbon Corp. Austgen-Biojet Former name of ABJ product group of Sanitaire Corp. Auto5™ Stack sampling system by Andersen Instruments, Inc
Auto Belt Rotary vacuum filter formerly offered by Walker Process Equipment. autochthonous A rock formation, organic matter, or substance that is produced or originates in the place where it is found autoclave a device that sterilizes materials by exposure to pressurized steam. Auto-Clean Dissolved oxygen sensor by Analytical Technology, Inc. Auto-Cleanse Self-cleaning pump station with differential pressure activated flush valve by ITT Flygt Corp Autocon Product group integrated within USFilter/Control Systems Auto-Dor Controlled aeration weir by Purestream, Inc autogenous combustion Burning that occurs when the heat of combustion of a wet organic material or sludge is sufficient to vaporize the water and maintain combustion without auxiliary fuel. autogenous temperature Equilibrium temperature in sludge combustion where the eat input from the fuel equals the heat losses, and combustion is self-supporting autoignition temperature The minimum temperature at which a substance ignites without application of a flame or spark. Auto-Jer Pressure leaf filter by USFilter/Whittier Autojust Automatic feedwell gate controller for circular sludge collectors by USFilter/Aerator Products automatic sampling Collecting samples of prescribed volume over a defined time period by an apparatus designed to operate remotely without direct manual control auto-oxidation A self-induced oxidation process. Autopress High throughput automatic filter press by USFilter/Dewatering Systems Auto-PulseTM Tubular backpulse filter by USFilter/Whittier Auto-Rakee Reciprocating rake bar screen by Franklin Miller, Inc autoreactive A compound that is reactive under normal conditions and does not equire heat, additional compounds, or a change in conditions Auto-Retreat Automatic bar screen control system by Infilco Degremont, Inc. AutoSD/M Portable, computer-based silt density index instrument by King Lee Auto-Shellam Granular media filter by USFilter/Whittier Auto-ShokTM Tube-type vertical pressure leaf filter by USFilter/Whittier. Auto-SkimmerIM Skimmer used to remove floating hydrocarbons from water wells by Science Application International Corp autothermal thermophilic aerobic digestion(ATAD) A biological digestion sys- tem that converts soluble organics to lower-energy forms through anaerobic fermentative, and aerobic processes at thermophilic temperatures autothermic combustion See"autogenous combustion. Autotravel Traveling bridge sludge collectors by Simon-Hartley, Ltd. Autotrol Rotating biological contactors product line by USFilter/Envirex autotroph Organism that derives its cell carbon from carbon dioxide Auto-Vac Rotary drum filter by Alar Engineering Corp autoxidation A spontaneous process in which a compound is oxidized, usually in the presence of oxygen, but other compounds can act as electron acceptors
AutoBelt Rotary vacuum filter formerly offered by Walker Process Equipment. autochthonous A rock formation, organic matter, or substance that is produced or originates in the place where it is found. autoclave A device that sterilizes materials by exposure to pressurized steam. Auto-Clean Dissolved oxygen sensor by Analytical Technology, Inc. Auto-Cleanse Self-cleaning pump station with differential pressure activated flush valve by ITT Flygt Corp. Autocon Product group integrated within USFilter/Control Systems. Auto-Dox Controlled aeration weir by Purestream, Inc. autogenous combustion Burning that occurs when the heat of combustion of a wet organic material or sludge is sufficient to vaporize the water and maintain combustion without auxiliary fuel. autogenous temperature Equilibrium temperature in sludge combustion where the heat input from the fuel equals the heat losses, and combustion is self-supporting. autoignition temperature The minimum temperature at which a substance ignites without application of a flame or spark. Auto-Jet® Pressure leaf filter by USFilter/Whittier. Autojust Automatic feedwell gate controller for circular sludge collectors by USFilter/Aerator Products. automatic sampling Collecting samples of prescribed volume over a defined time period by an apparatus designed to operate remotely without direct manual control. auto-oxidation A self-induced oxidation process. Autopress High throughput automatic filter press by USFilter/Dewatering Systems. Auto-Pulse™ Tubular backpulse filter by USFilter/Whittier. Auto-Rake® Reciprocating rake bar screen by Franklin Miller, Inc. autoreactive A compound that is reactive under normal conditions and does not require heat, additional compounds, or a change in conditions. Auto-Retreat Automatic bar screen control system by Infilco Degremont, Inc. AutoSDI™ Portable, computer-based silt density index instrument by King Lee Technologies. Auto-Shell™ Granular media filter by USFilter/Whittier. Auto-Shok™ Tube-type vertical pressure leaf filter by USFilter/Whittier. Auto-Skimmer™ Skimmer used to remove floating hydrocarbons from water wells by Science Application International Corp. AutoTherm™ Aerobic thermophilic digestion system by CBI Walker, Inc. autothermal thermophilic aerobic digestion (ATAD) A biological digestion system that converts soluble organics to lower-energy forms through anaerobic, fermentative, and aerobic processes at thermophilic temperatures. autothermic combustion See “autogenous combustion.” Autotravel Traveling bridge sludge collectors by Simon-Hartley, Ltd. Autotrol Rotating biological contactors product line by USFilter/Envirex. autotroph Organism that derives its cell carbon from carbon dioxide. Auto-Vac® Rotary drum filter by Alar Engineering Corp. autoxidation A spontaneous process in which a compound is oxidized, usually in the presence of oxygen, but other compounds can act as electron acceptors