wet air oxidation (WAO) Process where sludge and compressed air are pumped into a pressurized reactor and heated to oxidize the volatile solids without vaporizing the liquid. wet bulb temperature The temperature reading taken from a thermometer with a wetted wick surrounding its bulb. wet electrostatic precipitator (WESP) An electrostatic precipitator whose col- lecting electrodes are rinsed with water to remove particulates. wet scrubber An air pollution control device used to remove particulates and fumes from air by entraining the pollutants in a water spray. wet steam Steam containing water droplets. wet weather flow The flow in a combined sewer during snowmelt and rain events. wet well A chamber in which water or wastewater is collected and to which the suction of a pump is connected. Wetec™ Wet aeration installation system by Aeration Technologies, Inc. wetlands Surface areas including swamps, marshes, and bogs which are inundated or saturated by groundwater frequently enough to support a prevalence of vegetation adapted for life in saturated soil conditions. wetlands treatment A wastewater treatment system using the aquatic root system of cattails, reeds, and similar plants to treat wastewater applied either above or below the soil surface. wetness index The precipitation for a given year expressed as a ratio of the mean annual precipitation. wetted perimeter The length of wetted contact area between a stream of flowing water and the channel that contains it. WFI See “water for injection (WFI).” Wheeler Sand filter underdrain by Roberts Filter Group. Whirl-Flo ® Solids handling vortex pump by ITT A-C Pump. Whirl-Wet-AG Airborne dust collector by Tri-Mer Corp. Whispair ® Rotary blower and gas pump product line by Dresser Industries/Roots Division. white goods Large household appliances such as stoves, refrigerators, or washing machines which are discarded as wastes. white water Filtrate from a paper- or board-forming machine, usually recycled for density control. Whitewater Dissolved air flotation system by Water Resources Group, Inc. WhiteWater™ Low profile air strippers by QED Environmental Systems, Inc. WHM ® Bulk chemical handling products by USFilter/Zimpro. WHO World Health Organization. whole effluent toxicity (WET) The aggregate toxic effect of an effluent measured directly by a toxicity test. WHPP Wellhead protection program. Wiese-Flo ® Self-cleaning filter screen by USFilter/Headworks Products. wildlife refuge An area designated for the protection of wild animals, within which hunting and fishing are either prohibited or strictly controlled. Willett Pump Electro/hydraulic ram pump by USFilter/Dewatering Systems. © 2001 by CRC Press LLC William Green Former screening equipment manufacturer acquired by Brackett Geiger. Willowtech ® Sludge mixer/blender by Ashbrook Corp. windage emission Emission of vapors resulting from wind blowing through a free- vented tank and educting some of the saturated vapors. windbreak A row of trees planted on level land as protection against winds and erosion. Windjammer™ Brush aerator by United Industries, Inc. windrow composting A composting method where municipal wastewater solids are arranged in long triangular-shaped piles, called windrows, which are mechanically turned and remixed periodically. Windrow-Mate Compost odor control system by NuTech Environmental Corp. Winklepress ® Belt filter press by Ashbrook Corp. (U.S.), and Gebr. Bellmer GmbH (Europe). Winkler titration A standard iodometric titration method of determining the dis- solved oxygen level of a water or wastewater. wire-to-wire efficiency The efficiency of a pump and motor together. witching See “dowsing.” WLM See “working level month (WLM).” work A force acting over a distance measured in joules or foot-pounds. work exchanger A mechanical energy recovery device where the energy of one fluid stream is transferred to another fluid. working level month (WLM) A unit of measure used to determine cumulative exposure to radon. working load An allowable recommended tensile load for chains used on convey- ors, screens, or other applications of low relative speeds. worm A shank having at least one complete thread around the pitch surface. worm gear A gear with teeth cut on an angle to be driven by a worm; used to connect nonparallel, nonintersecting shafts. WPCF Water Pollution Control Federation. Former name of “Water Environment Federation (WEF).” WPCP Water pollution control plant. WQA Water Quality Act of 1987. WQS Water Quality Standard. WRDA Water Resources Development Act. WRI World Resources Institute. Wring-Dry Internally fed rotary fine screen by Schlueter Co. WSA™ Former name of BG-WSA, Inc. WSF Water soluble fraction. WSRA Wild and Scenic Rivers Act. WSTA Water Science and Technology Association. WSTB Water Sciences and Technology Board. WTP Water treatment plant. WTS Former name of product group integrated into USFilter/Industrial Wastewater Systems. WW Wastewater. © 2001 by CRC Press LLC WWEMA Water and Wastewater Equipment Manufacturers Association. WWF World Wildlife Fund. WWTF Wastewater treatment facility. WWTP Wastewater treatment plant. Wyss ® Fine bubble diffuser by Parkson Corp. X X-20™ Thin film composite reverse osmosis membrane by TriSep Corp. XCELL™ Cell-less filter by USFilter/Davco. xenobiotic A description for any chemical compound that is foreign, and usually harmful, to the body of a living organism or biosystem. Xentra Continuous emissions analyzer by Servomex Co. xeric An organism that requires very little moisture to sustain life. xeriscape A landscape design used in arid climates that utilizes native and drought- tolerant plants in conjunction with water conservation techniques. X-Flo™ Crossflow-type plastic trickling filter media by the former American Surfpac Corp. XLP™ Rotary positive blower by Dresser Industries/Roots Division. XL-Plus ® Solid bowl centrifuge by Baker Process. XOtherm™ Spray cooling system by Environmental Dynamics Inc. XP See “explosion proof (XP).” X-Pruf™ Explosion proof portable submersible pump by Crane Pumps & Systems. xQy A design stream flow condition that describes the lowest flow that will occur for (x) consecutive days not more than once every (y) years. See also “7Q10.” XR-5 ® Containment geomembrane lining by Seaman Corp. X-ray fluorescence A technique used in the analysis of water-formed deposits and heavy metals or corrosion products in water. Xtractor™ Sludge removal process by USFilter/Davco. xylene The common name for dimethylbenzene, a volatile organic compound used as a solvent and insecticide. Chemical formula is C 6 H 4 (CH 3 ) 2 . Y yard waste Grass clippings, leaves, and miscellaneous vegetative matter. yellow cake One of the final precipates in uranium extraction. Yellow Jacket™ Floating hydrocarbon detection device by QED Environmental Systems, Inc. yellow water Water colored as a result of the presence of iron, also called “red water.” © 2001 by CRC Press LLC yellow-boy Iron oxide flocculent usually observed as orange-yellow deposits in surface streams with excess iron content. yield The amount of a material produced by a process or chemical reaction. yield point The stress at which a substance undergoes significant change without an increase in applied stress. Z Z Chlor™ Chlorine and sulfite measurement and control unit by Bailey-Fischer & Porter. ZD See “zero discharge (ZD).” zebra mussel Freshwater mollusk that can foul water intake systems, treatment plants, and piping by attaching itself to a solid structure, eventually restricting flow. ZeeWeed ® Membrane bioreactor technology by Zenon Environmental, Inc. Zenobox Membrane filtration system by Zenon Environmental, Inc. Zenofloc Polymer control system for belt filter press by Zenon Environmental, Inc. ZenoGem ® Membrane bioreactor treatment process for tertiary treated wastewater by Zenon Environmental, Inc. Zeo-Karb ® Sulfonated coal cation exchange process by USFilter/Warren. Zeol™ Rotor concentrator for VOC abatement by Munters Zeol Corp. zeolite Minerals or synthetic resins that have ion exchange capabilities. zeolite softening Water softening process using a zeolite resin bed to accomplish ion exchange. Zeo-Rex ® Oxidizing filter for iron and manganese removal by USFilter/Warren. Zephyr ® Cartridge-type air filter by Farr Co. Zephyr™ Induced air flotation system by Aeromix Systems, Inc. zero discharge (ZD) A facility that discharges no material to the environment. zero liquid discharge (ZLD) A facility that discharges no liquid effluent to the environment. zero ODP Zero ozone depletion potential. zero order reaction A reaction in which the rate of change is independent of the concentration of the reactant. zero population growth (ZPG) The situation where the birthrate is constant and equal to the death rate. zero soft water Water having less than 1.0 grain per gallon as calcium carbonate. Zerofuel Fluidized bed sludge incinerator by Seghers Better Technology USA. zeta potential (ZP) The voltage differential between the surface of the diffuse layer surrounding a colloidal particle and the bulk liquid beyond. Zetag ® Cationic polyelectrolytes by Ciba Specialty Chemicals. Zeta-Pak Cartridge filter by Alsop Engineering Co. Zickert Product line of Waterlink, Inc. ZID See “zone of initial dilution (ZID).” © 2001 by CRC Press LLC Zimmerman Process Wet air oxidation process by USFilter/Zimpro. Zimpress Plate and frame sludge press by USFilter/Zimpro. Zimpro Environmental Former name of USFilter/Zimpro. Zimpro Process Thermal sludge conditioning process by USFilter/Zimpro. ZLD See “zero liquid discharge (ZLD).” Z-list OSHA’s tables of toxic and hazardous air contaminants. Z-metal Pearlitic malleable iron chain material by USFilter/Envirex. ZOC See “zone of contribution.” ZOI See “zone of incorporation.” zone of aeration The comparatively dry soil or rock located between the ground surface and the top of the water table. zone of contribution (ZOC) The area surrounding a pumping well that includes all areas that supply water to recharge the well. zone of incorporation (ZOI) The depth to which soil on a landfarm is plowed or tilled to receive wastes. zone of initial dilution (ZID) The part of a lake or river where a discharge from an outfall first mixes with the receiving waters. zone of saturation The portion of the earth’s crust below the water table where the pores are filled with water at greater than atmospheric pressure. zooglea A gelatinous matrix developed by growing bacteria associated with trick- ling filter beds and activated sludge floc. zooplankton Small aquatic animals that possess little or no means of propulsion. ZP See “zeta potential (ZP).” ZPG See “zero population growth (ZPG).” ZRL Zero risk level. © 2001 by CRC Press LLC MANUFACTURERS DIRECTORY A.B. Marketech, Inc. 9708 N. Range Line Rd. Mequon, WI 53092 Phone: 262-255-7448 Fax: 262-241-3443 A.O. Smith Engineered Products 2101 S. 21st St. Parsons, KS 67357 Phone: 316-421-0200 Fax: 316-421-9122 www.tectank.com A-C Compressor Corp. 401 E. South Island St. Appleton, WI 54915 Phone: 920-738-3080 Fax: 920-738-3141 www.accompressor.com Abanaki Corp. 17387 Munn Rd. Chagrin Falls, OH 44022 Phone: 440-543-7400 Fax: 440-543-7404 www.abanaki.com ABB Air Preheater, Inc. P.O. Box 372 Wellsville, NY 14895 Phone: 716-593-2700 Fax: 716-593-2721 www.abb.com ABB Raymond 650 Warrenville Rd. Lisle, IL 60532 Phone: 630-971-2500 Fax: 630-971-1076 ABS Pumps, Inc. 140 Pond View Dr. Meriden, CT 06450 Phone: 203-238-2700 Fax: 203-238-0738 www.abspumpsusa.com AbTech Industries 4110 N. 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Terrace Cape Coral, FL 3 390 4 Phone: 94 1-540-7766 Fax: 94 1-540-0076 © 2001 by CRC Press LLC Hitachi Maxco, Ltd 1630 Cobb International Rd Kennesaw, GA 30152 Phone: 770-424 -93 50 Fax: 770-424 -91 45 www.hitmax.com Hitachi Metals America, Ltd 2400 Westchester Ave Purchase, NY 10577 Phone: 91 4- 694 -92 00 Fax: 91 4- 694 -92 79 Huber+Suhner AG CH-8330 Pfaffikon, Switzerland Phone: 41- 195 2-2211 Fax: 41- 195 2-2552 www.hubersuhner.com... www.dorr-oliver.com Goodtech ASA P.O Box 4 29 N-1301 Sandvika, Norway Phone: 47-6755- 199 9 Fax: 47-6755- 199 0 www.goodtech.no Glegg Water Conditioning Co 29 Royal Rd Guelph, Ontario, Canada N1H 1G2 Phone: 5 19- 836-0500 Fax: 5 19- 836 -93 73 www.glegg.com Goodwin Pumps of America One Floodgate Rd Bridgeport, CT 08014 Phone: 6 09- 467-3636 Fax: 6 09- 467-4841 GLI International 90 20 W Dean Rd Milwaukee, WI 53224 Phone:... Houston, TX 77008 -99 81 Phone: 713-8 69- 0361 Fax: 713-8 69- 7332 www.dynatrolusa.com © 2001 by CRC Press LLC Azur Environmental 2232 Rutherford Rd Carlsbad, CA 92 008-8883 Phone: 760-438-8282 Fax: 760-438- 298 0 www.azurenv.com B.F Goodrich Co 99 11 Brecksville Brecksville, OH 44141 Phone: 216-447-5000 Fax: 216-447-5250 Badger Meter, Inc P.O Box 581 390 Tulsa, OK 74158 Phone: 91 8-836-8411 Fax: 91 8-832 -99 62 Bailey... 661 09- 099 9 Phone: 91 3-371-5000 Fax: 91 3-371-2272 www.pentairpump.com Fairfield Service Co 240 Boone Ave Marion, OH 43302 Phone: 740-387-3335 Fax: 740-387-48 69 www.fairfieldengineering.com © 2001 by CRC Press LLC Farr Co 3501 Airport Rd Jonesboro, AR 72401 Phone: 870 -93 3-8048 Fax: 800-222-6 891 www.farrco.com FE3, Inc P.O Box 808 Celina, TX 750 09 Phone: 97 2-382-2381 Fax: 97 2-382-3211 www.fe3.com Fen-Tech Environmental, . Box 599 Peru, IL 61354-0 599 Phone: 815-223-1500 Fax: 815-224-6 697 www.caruschem.com CASS Water Engineering, Inc. 17671 Cowan, Ste. 150 Irvine, CA 92 614-6031 Phone: 94 9-474- 393 3 Fax: 94 9 -95 5-2021 www.sbrcass.com Catalytic. 561-844-5246 Ag Environmental Products LLC 98 04 Pflumm Rd. Lenexa, KS 66215 Phone: 91 3- 599 - 691 1 Fax: 91 3- 599 -2121 www.soygold.com Ag-Chem Equipment Co. 5720 Smetana Dr. Minnetonka, MN 55343 -96 88 Phone: 612 -93 3 -90 06 Fax:. 216-447-5250 Badger Meter, Inc. P.O. Box 581 390 Tulsa, OK 74158 Phone: 91 8-836-8411 Fax: 91 8-832 -99 62 Bailey Polyjet P.O. Box 8070 Fresno, CA 93 747 Phone: 5 59- 252-4 491 Fax: 5 59- 453 -90 30 © 2001 by CRC Press LLC