مسرد بيئي H

المعجم البيئي مشروع قيد العمل يحتاج ترجمة وإضافة بنود

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H. pylori See “Heliobacter pylori.”
H2O See “water.”
H2O2 See “hydrogen peroxide.”
H2S See “hydrogen sul.de.”
HA Health advisory.
ha See “hectare (ha).”
HAA See “haloacetic acid (HAA).”
HAA5 The sum of the concentration of .ve haloacetic acid compounds which

include mono-, di-, and trichloroacetic acids and mono- and dibromoacetic acids.

HAA6 The sum of the concentration of six haloacetic acid compounds which include mono-, di-, and trichloroacetic acids, mono- and dibromoacetic acids, and bromochloroacetic acid.
HAAFP Haloacetic acid formation potential.
habitat The place where a human, animal, plant, or microorganism population lives, and its surroundings, both living and nonliving.
Hach One pH Electrode by Hach Co.
hadal zone The ecological zone of the ocean .oor that lies in a deep trench below the abyssal zone, generally deeper than 6000 meters.
Halberg Digester draft tube sludge mixer by Sterling Fluid Systems (USA).
half life The time required for half of the atoms of a particular radioactive substance to transform or decay to another nuclear form.
half life, chemical The time required for the concentration of a chemical being tested to be reduced to one half of its initial value.
halides A compound containing a halogen.
haloacetic acid (HAA) A type of disinfection byproduct formed during the chlorination of water containing natural organic matter.
halocline A well-de.ned salinity gradient in an ocean.
halogen One of the chemical elements of the group containing .uorine, chlorine, bromine, iodine, and astatine.
halogenated organic compounds (HOC) Compounds having a halogen-carbon bond.
halon Bromine-containing compounds with long atmospheric lifetimes whose breakdown in the stratosphere causes depletion of ozone.
halophyte Plants capable of living in salt water or salty soil.
Hamburg Rotor Surface aerator by Brackett Geiger.
HammerHead™ Groundwater pump by QED Environmental Systems, Inc.
hammermill A device with hammer-like arms used to shred or grind solids to facilitate further treatment or disposal.
handler A facility that accumulates and generates universal wastes or receives and/or sends universal wastes to a destination facility.
HAP Hazardous air pollutant.
HAPEMS Hazardous Air Pollutant Enforcement Management System.
HAPPS Hazardous Air Pollutant Prioritization System.
Harbor Bosun Dye tablets by Formulabs, Inc.
Harborlite® Perlite material by Celite Corp.
hard water Alkaline water containing dissolved salts that interfere with some industrial processes and prevent soap from sudsing.
HaRDE® Electrostatic precipitator by Wheelabrator Air Pollution Control, Inc.
Hardinge Manufacturer of traveling bridge .lter whose product line was acquired by In.lco Degremont, Inc.
hardness The total concentration of calcium and magnesium ions in water expressed as calcium carbonate.
hardpan A compacted, impermeable layer of soil at or near the surface.
Hastelloy® Corrosion resistant, nickel-based alloy by Haynes International, Inc.

HATREMS Hazardous and Trace Emissions System.
HAV Hepatitis A virus.
Hawker Siddeley Brackett Former parent company of Brackett Geiger.
Hazardous and Solid Waste Amendments (HSWA) The 1984 amendments to RCRA regulating underground tank storage and land disposal of certain hazardous wastes.
hazardous area, class 1 Locations where .ammable gases or vapors may be present in the air in suf.cient quantities to produce explosive or ignitable mixtures.
hazardous material A solid, liquid, or gaseous material that is detrimental to human health.
Hazardous Ranking System (HRS) The method used to evaluate the relative potential of hazardous substance releases to cause health or safety problems or ecological or environmental damage.
hazardous waste Any waste or combination of wastes which pose a substantial present or potential hazard to human health or living organisms because they are nondegradable, persistent in nature, or may otherwise cause detrimental cumulative effects.
Hazen-Williams coef.cient A roughness coef.cient related to the in.uence of pipe material on the velocity characteristics of a .uid.
HAZMAT Hazardous materials.
HAZOP Hazard and operability study.
HAZWOPER Hazardous Waste Operations and Emergency Response.
HBV Hepatitis B virus.
HC (1) Hydrocarbon. (2) Hazardous constituents.
HCFCs See “hydrochloro.uorocarbons (HCFCs).”
HCV Hepatitis C virus.
HDPE See “high density polyethylene (HDPE).”
HDT (1) Hydraulic detention time. (2) Highest dose tested in a study.
HDXLPE High density crosslinked polyethylene.
head (1) A measure of the pressure exerted by a .uid expressed as the height of an enclosed column of the .uid which could be balanced by the pressure in the system. (2) The source or upper end of a system, e.g., headwater.
header A pipe manifold .tted with several smaller lateral outlet pipes.
headloss The difference in water level between the upstream and downstream sides of a treatment process attributed to friction losses. Sometimes called “pressure drop.”
headwater The source or upper reaches of a stream.
headworks The initial structure and devices located at the receiving end of a water or wastewater treatment plant.
HEAL Human exposure assessment location.
health advisory level A nonregulatory health-based reference level of chemical traces in drinking water at which there are no adverse health risks when ingested over various periods of time.
health assessment An evaluation of available data on existing or potential risks to human health posed by a Superfund site.

hearth The bottom of a furnace upon which waste materials are exposed to the .ame.
heartwood The oldest, dense wood in the center of a tree which often contains an accumlation of resins and oils.
heat balance An accounting of the distribution of a system’s heat loss and heat gain.
heat exchanger A device used to transfer heat from one substance to another. See also “shell-and-tube heat exchanger.”
heat island An urban phenomenon where air pollutants and the heat from a combination of tall buildings, concrete pavement, and other materials combine to create a localized haze dome that traps rising hot air resulting in higher temperatures and air pollution.
heat of condensation The amount of heat released when a vapor changes state to a liquid.
heat of sublimation The amount of energy required to convert ice directly to a vapor.
heat of vaporization The amount of heat required to change a volume of liquid to a vapor.
heat pump A device for transferring heat from a cooler reservoir to a hotter one by mechanical means involving the compression and expansion of a .uid.
heat recovery The capture and use of heat that would otherwise be lost as waste heat.
heat sink Any material that is used to absorb heat.
Heat Systems Former name of Misonix, Inc.
heat tracing The electrical or steam heating of piping and equipment to prevent freezing.
heat transfer The transfer of heat from one body to another by means of radiation, conductance, or convection.
heat value The quantity of heat that can be released from a sludge per unit mass of the sludge solids.
Heatamix Heating and recirculation system for anaerobic sludge digesters by Simon-Hartley, Ltd.
heater treater Oil .eld produced water treatment unit used to break water-in-oil emulsions with heat and chemicals.
HeatX Anaerobic digester gas heating unit by Walker Process Equipment.
heavy metals Metals that can be precipitated by hydrogen sul.de in an acid solution and which may be toxic to humans above certain concentrations.
heavy water Water with a hydrogen isotope having an atomic weight of 2.
hectare (ha) A unit of area equal to 10,000 square meters. One hectare is equal to 2.471 acres.
HEEB High-energy electron beam irradiation.
HEI Health Effects Institute.
Hela-Flow Plastic laterals for water and wastewater treatment by Liquid-Solids Separation Corp.
Helaskim Helical surface skimmer by Walker Process Equipment.
HeliCarb Carbon dioxide contactor by CBI Walker, Inc.

Heliclean® Open channel spiral screen with screenings washer by Waterlink Sep
arations, Inc. Helico Screw type screenings press by In.lco Degremont, Inc. Heli.ow® Spiral tube bundle heat exchangers by Graham Manufacturing Co. helio-A pre.x referring to the sun or sunlight. Heliobacter pylori A bacterium that causes stomach ulcers and has been identi.ed
as an emerging waterborne health threat. Also known as H. pylori. Heli-Press Screenings compactor by Vulcan Industries, Inc. Helisieve Plus™ Septage receiving station by Waterlink Separations, Inc. Helisieve® Open channel spiral screen by Waterlink Separations, Inc. HeliSkim Helical surface skimmer by Walker Process Equipment. HeliThickener Interrupted .ight screw conveyor for sludge collectors by Walker
Process Equipment. Helixpress Screenings dewatering press/conveyor by Waterlink Separations, Inc. Hellmut Geiger Former name of Brackett Geiger. helminth A parasitic worm. HEM Human exposure modeling. hemi-hydrate A crystalline compound having one molecule of water of crystal
lization per two molecules of compound.
Henry’s Law The weight of any gas that will dissolve in a given volume of a liquid at constant temperature is directly proportional to the pressure that the gas exerts above the liquid.
HEPA .lter See “high ef.ciency particulate air .lter (HEPA).”
hepatitis An acute viral disease which results in liver in.ammation and may be

transmitted by direct contamination of a water supply by sewage. heptachlor An insecticide banned for use on food products and seed treatment. herb A seed plant whose stem is not woody and whose leaves, stems, or roots are
often used for seasoning, medicine, or fragrance. herbicide A synthetic organic compound used to control plant growth. Hercules Screening equipment product line of Moyno Industrial Products. Hercules® Pressure leaf .lters by Liquid-Solids Separation Corp. HES Huntington Environmental Systems, Inc. heterotrophic bacteria Bacteria that derives it’s cell carbon from organic carbon;
most pathogenic bacteria are heterotrophic bacteria. heterotrophic plate count (HPC) A laboratory method of determining the level of heterotrophic bacteria in a sample. Formerly known as “standard plate count.” Hevi-Duty Traveling water screen replacement parts products by USFilter/Rex & Link-Belt Products. hexavalent chrome A toxic form of chrome used in plating operations, usually
reduced to the trivalent form and precipitated as a hydroxide. HFCs See “hydro.uorocarbons (HFCs).” HGL Hydraulic grade line. HHC Highly hazardous chemical. HHE Human health and the environment. HHW Household hazardous waste. Hi-Cap® High rate thickener by Baker Process.

Hidrostal Screw/centrifugal impeller pump by Envirotech Pumpsystems.
Hi-Flo® Depth .lter and water softener products by Culligan International Corp.
HiFlo™ Thickener by WesTech Engineering, Inc.
Hi-GARD® Rotary trickling .lter by USFilter/General Filter.
high density polyethylene (HDPE) A synthetic organic material often used as land.ll liner because of its low permeability.
high ef.ciency particulate air .lter (HEPA) A .ltering system capable of trapping and retaining at least 99.97% of all monodispersed particles 0.3 micrometer in diameter or larger.
High Flux Series™ Membrane cleaning products for restoring membrane .ux by King Lee Technologies.
high performance liquid chromatography (HPLC) Instrumental technique for measuring trace levels of organics by means of UV adsorption.
High Resolution Redox® Disinfection and dechlorination control technology by USFilter/Stranco.
high velocity air .lter (HVAF) An air pollution control .ltration device for the removal of sticky, oily, or liquid aerosol particulate matter from exhaust gas streams.
High-Flux TF™ Oil control chemical for use in membrane treatment system by King Lee Technologies.
high-level radioactive waste (HLW) The highly radioactive waste material resulting from the reprocessing of spent fuel, the spent fuel itself, and much of the waste generated from nuclear weapons production, with activities measured in curies per liter.

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