مسرد بيئي U

المعجم البيئي مشروع قيد العمل يحتاج إلى ترجمة وإضافات

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• U.S. Filter Former name of USFilter Corp.
• UAQI Uniform Air Quality Index.
• UARG Utility Air Regulatory Group
• UBC Uniform Building Code.
• UBlock™ Air/water .lter underdrain by Tetra Process Technologies.
• UCC See “ultra clean coal (UCC).”
• UCCI Urea-formaldehyde foam insulation.
• UCL Upper control limit.
• UDMH Unsymmetrical dimethyl hydrazine.
• UEL Upper explosive limit.
• UF See “ultra.ltration (UF).”
• UFL Upper .ammability limit.
• UFRV See “unit .lter run volume (UFRV).”
• UFW See “unaccounted-for water (UFW).”
• UHMW Ultrahigh-molecular-weight.
• UHR Filter Dual media sand .lter by Idreco USA, Ltd.
• UIC See “Underground Injection Control (UIC).”
• UL® Underwriters Laboratories, Inc.
• ullage The amount that a container or tank lacks of being full.
• Ultima Nonmetallic sludge collector .ight by Budd Co.
• ultimate BOD (BODu) The amount of oxygen required to completely satisfy the

• carbonaceous and nitrogenous biochemical oxygen demand.

• ultimate strength The stress calculated on the maximum value of the force and the original area of the cross section which causes fracture of the material. Ultimer® Acrylamide polymer for sedimentation and sludge conditioning by Nalco
• Chemical Co. Ultipleat® High .ow .ltration element by Pall Corp. Ultipor III® Coreless .lter elements by Pall Corp. ultra clean coal (UCC) Coal that is washed, ground into .ne particles, and chem­
• ically treated to remove sulfur, ash, silicone, and other substances. Ultrabar™ Ultra.ltration barrier process by F.B. Leopold Co., Inc. Ultracept® Oil water separators by Jay R. Smith Mfg. Co. UltraChem™ Membrane for oily waste applications by Membrex, Inc. Ultradome® Domed, aluminum tank cover by Ultra.ote Corp. ultra.ltration (UF) A low pressure (200-700 kPa, 20-100 psi) membrane .ltration
• process which separates solutes in the 20 to 1000 angstrom (up to 0.1 micron)
• size range. UltraFlex® LPDE containment liner by SLT North America, Inc. Ultra.ow Programmable open-channel .ow measurement device by Monitek
• Technologies, Inc. Ultra-Guard Ultraviolet disinfection system by UV Systems Technology, Inc. Ultramix™ High ef.ciency mixer motor by Lightnin. ultrapure water Water with a speci.c resistance higher than 1 megohm-cm. UltraScrub Wet scrubber by Tri-Mer Corp. Ultrasep Ion exchange membrane for pressure driven processes by Ionics, Inc. ultrasonic Acoustic waves with frequencies above 20 kHz, not audible to the
• human ear. ultrasonic .owmeter A measurement device that transmits and receives sound
• waves through the .ow to determine liquid .ow rate. UltraStrip Air stripper by GeoPure Continental. Ultra-Sweep™ Spiral blade clari.er by Hi-Tech Environmental, Inc. Ultratest Polyelectrolyte used to enhance liquid/solid separation by Ashland
• Chemical, Drew Industrial. Ultra-Urban™ Stormwater runoff .lter screen by AbTech Industries. ultraviolet light (UV) Light rays beyond the violet region in the visible spectrum,
• invisible to the human eye. Ultrex Tubular membrane diffuser by Aeration Research Company. Ultrion SVC® Low molecular weight organic coagulant by Nalco Chemical Co. Ultrox® Organic destruction process using ultraviolet light and oxidants by USFil­
• ter/Industrial Wastewater Systems. unaccounted-for water (UFW) The fraction of water fed into a water distribution
• system which is not registered by the customers’ meters. unburned lime Another term for “calcium carbonate.” uncon.ned aquifer An aquifer containing water that is not under pressure. underdrain Flow collection and backwash water distribution system used to sup­
• port the .lter bed in most granular media .lters. Also called “.lter bottom.” under.ow The concentrated solids removed from the bottom of a tank or basin.

• Underground Injection Control (UIC) The program under the Safe Drinking Water Act that regulates the use of wells to pump .uids into the ground.
• underground storage tank (UST) A tank used to contain accumulations of reg­ulated substances with 10% or more of its volume underground.
• UNEP United Nations Environment Program.
• Uni-Dose™ Electronic metering pump by Liquid Metronics, Inc.
• Uni.ap Cast urethane .ap valve by Ashbrook Corp.
• Uni.ow Sloped bottom settling tanks equipped with chain and .ight sludge col­lector by USFilter/Envirex.
• uniformity coef.cient Method of characterizing .lter sand where the uniformity coef.cient is equal to the sieve size in millimeters that will pass 60% of the sand divided by that size passing 10%.
• UniMag™ Closed pipe .ow meter by Isco, Inc.
• UniMix Vertical or horizontal .occulation unit by Walker Process Equipment.
• Uni-Pac Water treatment equipment products by Cochrane Inc.
• Unipak™ Induced gas .otation system by Unicel, Inc.
• UniPro™ Reverse osmosis pump system by David Brown Union Pump Co.
• Unipure Heavy metals package waste removal system by Unipure Corp.
• Uni-Scour Dual media .lter with self-contained backwash storage by Smith & Loveless, Inc.
• Unisweep™ Filter surface wash system by Roberts Filter Group.
• Unisystem® Activated sludge wastewater treatment system by Aeration Industries, Inc.
• unit .lter run volume (UFRV) The amount of liquid .ltered between back­washes expressed as the product of the .lter run length and the .ltration rate.
• Unitank® Continuous .ow wastewater treatment system by Seghers Better Tech­nology USA.
• Unitech Evaporator and crystallizer product line by Graver Co.
• United States Filter USFilter.
• Unitherm™ Thermal VOC oxidation unit by Dürr Environmental, Inc.
• Unitube Suction-type sludge removal system for circular clari.ers by USFil­ter/Envirex.
• Uni-Vayor Sludge removal conveyor by the former Bowser-Briggs Filtration Co.
• Univer Chemicals used to determine water hardness by Hach Co.
• Universal® Sand .lter underdrain by F.B. Leopold Co., Inc.
• Universal RAI® Rotary positive blowers by Dresser Industries/Roots Division.
• Universal Screen Reciprocating rake bar screen by Meurer Industries, Inc.
• universal treatment standards (UTS) Rule addressing sampling methods of metal constituents in hazardous wastes for compliance with treatment standards.
• Universal Venturi Tube™ Flow measurement device by BIF.
• universal wastes Wastes that include used, nonlead acid batteries, recalled pesti­cides, and mecury-containing thermostats.
• UniversaLevel Continuous liquid level transmitter by Ametek Drexelbrook Engi­neering Co.
• Unizone Ozone generators by Praxair-Trailigaz Ozone Co.

• unleaded gasoline Gasoline containing very little or no “tetraethyl lead” anti­knock additives.
• Unox® A pure oxygen, activated sludge wastewater treatment process by Lotepro Corp (Western Hemisphere) and Linde-KCA-Dresden GmbH.
• unreasonable risk Under the Federal Insecticide, Fungicide, and Rodenticide Act, that is any unreasonable risk to man or the environment, taking into account the medical, economic, social, and environmental costs and bene.ts of any pesticide.
• unsaturated zone The area above the water table where soil pores are not fully saturated, although some water may be present.
• unstable Condition describing an element or compound that reacts spontaneously to form other elements or compounds.
• Upcore™ Up.ow countercurrent regeneration process and resins by Dow Chem­ical Co.
• UPE® Universal Process Equipment Co.
• up.ow clari.er Clari.er where .occulated water .ows upward through a sludge blanket to obtain .oc removal by contact with .occulated solids in the blanket.
• up.ow .lter Granular media .lter characterized by an upward .ow of liquid through the .lter bed.
• UPS Uninterruptible power supply.
• upset An unexpected disturbance of a process or operation.
• uptake The absorption or ingestion of an element or compound in an organism or substance.
• UPW Ultrapure water.
• urban runoff Stormwater from city streets and adjacent domestic or commercial properties which carries pollutants of various kinds into the sewer systems and receiving waters.
• urea A soluble nitrogen compound that is a component of mammalian urine.
• urease An enzyme that converts urea in urine into ammonia.
• USAID U.S. Agency for International Development.
• USC Uni.ed soil classi.cation.
• USCM U.S. Conference of Mayors.
• USDA U.S. Department of Agriculture.
• USDW Underground sources of drinking water.
• USEPA See “Environmental Protection Agency (EPA).”
• user fee Fee collected from only those persons who use a particular service, as compared to one collected from the public in general.
• USF USFilter.
• USFS United States Forest Service.
• USGS U.S. Geological Survey.
• USP U.S. Pharmacopeia.
• USPHS U.S. Public Health Service.
• USP-puri.ed water Water meeting USP-quality requirements that has been puri.ed by distillation, ion exchange, or other suitable processes from water complying with the U.S. EPA’s drinking water regulations and contains no added substances.
• UST See “underground storage tank (UST).”

• UTS See “universal treatment standards (UTS).”

• U-tube manometer See “manometer.”
• UV See “ultraviolet light (UV).”
• UV254 A measure of water’s ultraviolet absorption at a 254 nanometer wavelength which is considered representative of the humic content of natural organic matter and a surrogate for disinfection byproduct precursors.
• UV3000™ Package ultraviolet water and wastewater disinfection system by Trojan Technologies, Inc.
• UV4000™ Ultraviolet wastewater disinfection system by Trojan Technologies, Inc.
• UV8000™ Medium and low pressure ultraviolet water disinfection system by Trojan Technologies, Inc.
• Uvaster® UV disinfection system by USFilter.
• UVOX Ultraviolet oxidation.
• UVT™ Universal venturi tube .ow measurement by BIF

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