环境工程词典：Environmental Enginering Dictionary and Directory（Thomas M.Pankratz）

Environmental Enginering Dictionary Directory Thomas M.Pankratz LEWIS PUBLISHERS Boca Raton London New York Washington.D.C

ibrary of Congress Cataloging- in- Publication Data Pankratz, Tom M. Environmental engineering dictionary and directory /Thomas M. Pankratz. ISBN 1-56670-543-6(alk. pape 1. Environmental engineening--Dictionaries. 2. Brand name products--Dictionaries 3 Trademarks-. Dictionaries. 4. Environmental engineering .Directories. L. Title TD9P362000 00-044356 This book contains inform from authentic and highly regarded sources. Reprinted material is quoted with permission. a indicated. A wide variety of references are listed. Reasonable efforts have been made le data and information, but the author and the publisher cannot assume responsibility for th all materials or for the consequences of their us Neither this book rt may be reproduced or transmitted in any form or by any means, electronic mechanical, including photocopying, microfilming, and recording, or by any information storage or retrieval system, without prior permission in writing from the publisher. he nt of CRC Press LLC does not extend to copying for general distribution, for promotion, fo creating new works, or for resale. Specific permission must be obtained in writing from CRC Press LLC for such copying Direct all inquiries to CRC Press LLC, 2000 N.w. Corporate Blvd., Boca Raton, Florida 33431 Trademark Notice: Product or corporate names may be trademarks or registered trademarks, and are used only for identification and explanation, without intent to infringe. 2001 by CRC Press LLC Lewis Publishers is an imprint of CRC Press LLC No claim to original U.S. Government works IntemationalStandard Book Number1-56670-543-6 Library of Congress Card Number 00-044356 Printed in the United States of America 12345 0 Printed on acid-free

This book contains information obtained from authentic and highly regarded sources. Reprinted material is quoted with permission, and sources are indicated. A wide variety of references are listed. Reasonable efforts have been made to publish reliable data and information, but the author and the publisher cannot assume responsibility for the validity of all materials or for the consequences of their use. Neither this book nor any part may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopying, microfilming, and recording, or by any information storage or retrieval system, without prior permission in writing from the publisher. The consent of CRC Press LLC does not extend to copying for general distribution, for promotion, for creating new works, or for resale. Specific permission must be obtained in writing from CRC Press LLC for such copying. Direct all inquiries to CRC Press LLC, 2000 N.W. Corporate Blvd., Boca Raton, Florida 33431. Trademark Notice: Product or corporate names may be trademarks or registered trademarks, and are used only for identification and explanation, without intent to infringe. © 2001 by CRC Press LLC Lewis Publishers is an imprint of CRC Press LLC No claim to original U.S. Government works International Standard Book Number 1-56670-543-6 Library of Congress Card Number 00-044356 Printed in the United States of America 1 2 3 4 5 6 7 8 9 0 Printed on acid-free paper Library of Congress Cataloging-in-Publication Data Pankratz, Tom M. Environmental engineering dictionary and directory / Thomas M. Pankratz. p. cm. ISBN 1-56670-543-6 (alk. paper) 1. Environmental engineering--Dictionaries. 2. Brand name products--Dictionaries. 3. Trademarks--Dictionaries. 4. Environmental engineering--Directories. I. Title. TD9 .P36 2000 628--dc21 00-044356

Preface This book has been written to help professionals, students, and lay people identify the increasing number of terms in the fields of environmental engineering and More than 8000 terms, acronyms, and abbreviations applying to wastewater, potable water, industrial water treatment, seawater desalination, air pollution, incin- eration. and hazardous waste remediation have been defined The most unique feature of this book is the inclusion of more than 3000 trade marks and brand names. Many of these commercial terms for proprietary products or processes are so common or descriptive that they have fallen into general use This confusion is compounded by the fact that many terms contain similar prefixes (e. g, bio-, enviro-, hydra-, hydro-, etc. )and it is often difficult to tell them apart. This book originates from Screening Equipment Handbook, first published in 1988, whose glossary contains a list of screening-related trademarks and brand names along with their company affiliation. Even though that list was relatively short, a surprisingly large number of companies had come and gone or changed their names through mergers or acquisitions. This led to an expanded directory entitled, The Dictionary of Water and Wastewater Treatment Trademarks and Brand Names, published in 1991, and which contained 1200 commercial terms The Concise Dictionary of Environmental Engineering followed in 1996. In addition to the 2200 commercial terms, it was further expanded to include 3000 generic environmental engineering terms. Shortly after it was published, the envi ronmental equipment manufacturing industry began a consolidation led by USFilter Waterlink, Baker Hughes, ITT, F.B. Leopold, and others that has resulted in changes to 43% of the terms included in the 1996 edition During the research for this book, many other books, magazines, dictionaries, glossaries, buyer's guides, catalogs, brochures, and technical papers were reviewed to locate new terms and their definitions. Although there are too many references to list, I would like to acknowledge the help of these publications and their authors In addition to technically reviewing this book, John B. Tonner was especially helpful with his suggestions, advice, research assistance, and computer wizardry RegardlessofwhenIwouldcallJohnwasalwaysavailabletohelpHiswww.world- wide-water com Web site also proved to be a valuable research tool. I would like to acknowledge the libraries that were used in my research. They include the M D. Anderson Library at the University of Houston, the Helen Hall Library in League City, Ter Houston Public Library Central Branch, and the library at King Fahd University of Petroleum and Mining in Dhahran, Saudi Arabia. I also recognize USFilter and Alfa-Laval for their support. I'm grateful for the assistance of the many friends and colleagues who suggested new terms and challenged old ones, helped with definitions, provided

Preface This book has been written to help professionals, students, and lay people identify the increasing number of terms in the fields of environmental engineering and science. More than 8000 terms, acronyms, and abbreviations applying to wastewater, potable water, industrial water treatment, seawater desalination, air pollution, incin￾eration, and hazardous waste remediation have been defined. The most unique feature of this book is the inclusion of more than 3000 trade￾marks and brand names. Many of these commercial terms for proprietary products or processes are so common or descriptive that they have fallen into general use. This confusion is compounded by the fact that many terms contain similar prefixes (e.g., bio-, enviro-, hydra-, hydro-, etc.) and it is often difficult to tell them apart. This book originates from Screening Equipment Handbook, first published in 1988, whose glossary contains a list of screening-related trademarks and brand names along with their company affiliation. Even though that list was relatively short, a surprisingly large number of companies had come and gone or changed their names through mergers or acquisitions. This led to an expanded directory entitled, The Dictionary of Water and Wastewater Treatment Trademarks and Brand Names, published in 1991, and which contained 1200 commercial terms. The Concise Dictionary of Environmental Engineering followed in 1996. In addition to the 2200 commercial terms, it was further expanded to include 3000 generic environmental engineering terms. Shortly after it was published, the envi￾ronmental equipment manufacturing industry began a consolidation led by USFilter, Waterlink, Baker Hughes, ITT, F.B. Leopold, and others that has resulted in changes to 43% of the terms included in the 1996 edition. During the research for this book, many other books, magazines, dictionaries, glossaries, buyer’s guides, catalogs, brochures, and technical papers were reviewed to locate new terms and their definitions. Although there are too many references to list, I would like to acknowledge the help of these publications and their authors. In addition to technically reviewing this book, John B. Tonner was especially helpful with his suggestions, advice, research assistance, and computer wizardry. Regardless of when I would call, John was always available to help. His www.world￾wide-water.com Web site also proved to be a valuable research tool. I would like to acknowledge the libraries that were used in my research. They include the M.D. Anderson Library at the University of Houston, the Helen Hall Library in League City, Texas, the Houston Public Library Central Branch, and the library at King Fahd University of Petroleum and Mining in Dhahran, Saudi Arabia. I also recognize USFilter and Alfa-Laval for their support. I’m grateful for the assistance of the many friends and colleagues who suggested new terms and challenged old ones, helped with definitions, provided encouragement

or assisted in the book's production Some of these people include Robert w. Brown Gordon Carter, Bill Copa, Chad Dannemann, Jim Force, Jack Gardiner, Duane Germenis, Stacie Jones, John Meidl, Mack Moore, Chad Pankratz, Bill Perpich, Barb Petroff, Jim Symons, Mark Wilson, and Joe Zuback Like the first edition, published in 1996, much of my work on this book took place while traveling; the rest was done in the evenings and weekends. I would never have been able to finish without the continued patience and support of my wife, Julie. and our children. Chad. Sarah. Mike and Katie. This book is dedicated to my wife, Julie Lynn Pankratz, and our grandson, Gabriel R Suarez, who was born the same day this book was completed. Tom p ratz

or assisted in the book’s production. Some of these people include Robert W. Brown, Gordon Carter, Bill Copa, Chad Dannemann, Jim Force, Jack Gardiner, Duane Germenis, Stacie Jones, John Meidl, Mack Moore, Chad Pankratz, Bill Perpich, Barb Petroff, Jim Symons, Mark Wilson, and Joe Zuback. Like the first edition, published in 1996, much of my work on this book took place while traveling; the rest was done in the evenings and weekends. I would never have been able to finish without the continued patience and support of my wife, Julie, and our children, Chad, Sarah, Mike, and Katie. This book is dedicated to my wife, Julie Lynn Pankratz, and our grandson, Gabriel R. Suarez, who was born the same day this book was completed. Tom Pankratz

Introduction This dictionary contains terms used in the fields of environmental engineering and environmental science, and the definitions provided relate to their use in an envi ronmental context only The commercial terms represent company brand names or trademarks, and have been italicized to differentiate them from the technical terms in general usage Whenever appropriate, the use of TM or has been included following the name of the entry, although terms may be registered trademarks even though they do not include either symbol. It is also possible that some of the entries listed as trademarks may not be registered or properly used by the manufacturers listed in connection with them Brand names and trademarks often evolve and take different forms variati n the use of capitalization, hyphens, or symbols often occur over time. The repre sentation of the words included in this book reflects the latest version seen in use and are assumed to be the preferred form. Commercial acronyms are included if they are registered trademarks or com- monly used abbreviations of company names. Nonregistered product model numbers and trademarks that are the same as the name of a company are not always included Many definitions were extrapolated from stories, advertisements, or product bro- chures and were not directly corroborated by the company listed as being responsible The company name included in the definition of a commercial term usually represents the company that manufactures that particular product or process. In some cases, the listed company may only market, distribute, or license the product. In several instances. the same brand has been listed more than once to describe different products or processes from different companies. The author is unaware of any dispute involving these cases and is simply reporting that the companies identified have used the term for the product described. In some cases, the term may be dormant, obsolete, or no longer available from the company listed Company addresses, phone numbers, and e-mail addresses listed in the Manu- facturer's Directory were confirmed over a period of several years. Some contact information may have changed, especially with the recent telephone area code hanges in many parts of the U.S. Readers are cautioned that an incorrect phone number, address, or e-mail address does not mean that a company is no longer in business There are a few cases where a company whose name is listed in a definition is not included in the Manufacturers Directory. If current contact information for a company could not be located, the out-of-date information was not included Terms have been arranged alphabetically using current word processing software

Introduction This dictionary contains terms used in the fields of environmental engineering and environmental science, and the definitions provided relate to their use in an envi￾ronmental context only. The commercial terms represent company brand names or trademarks, and have been italicized to differentiate them from the technical terms in general usage. Whenever appropriate, the use of ™ or ® has been included following the name of the entry, although terms may be registered trademarks even though they do not include either symbol. It is also possible that some of the entries listed as trademarks may not be registered or properly used by the manufacturers listed in connection with them. Brand names and trademarks often evolve and take different forms. Variations in the use of capitalization, hyphens, or symbols often occur over time. The repre￾sentation of the words included in this book reflects the latest version seen in use and are assumed to be the preferred form. Commercial acronyms are included if they are registered trademarks or com￾monly used abbreviations of company names. Nonregistered product model numbers and trademarks that are the same as the name of a company are not always included. Many definitions were extrapolated from stories, advertisements, or product bro￾chures and were not directly corroborated by the company listed as being responsible for the term. The company name included in the definition of a commercial term usually represents the company that manufactures that particular product or process. In some cases, the listed company may only market, distribute, or license the product. In several instances, the same brand name has been listed more than once to describe different products or processes from different companies. The author is unaware of any dispute involving these cases and is simply reporting that the companies identified have used the term for the product described. In some cases, the term may be dormant, obsolete, or no longer available from the company listed. Company addresses, phone numbers, and e-mail addresses listed in the Manu￾facturer’s Directory were confirmed over a period of several years. Some contact information may have changed, especially with the recent telephone area code changes in many parts of the U.S. Readers are cautioned that an incorrect phone number, address, or e-mail address does not mean that a company is no longer in business. There are a few cases where a company whose name is listed in a definition is not included in the Manufacturer’s Directory. If current contact information for a company could not be located, the out-of-date information was not included. Terms have been arranged alphabetically using current word processing software

In general, terms related to plumbing, household products, computer programs, or software have not been included All of the terms have been listed in good faith. A reasonable attempt has been made to confirm all definitions and, in the case of commercial terms, verify the companies responsible for the listings. The author apologizes for any omissions or errors If you are aware of any changes or additions that should be included in subse quent editions, please send them to Tom Pankratz, P.O. Box 75064, Houston, Texas USA,77234-5064

In general, terms related to plumbing, household products, computer programs, or software have not been included. All of the terms have been listed in good faith. A reasonable attempt has been made to confirm all definitions and, in the case of commercial terms, verify the companies responsible for the listings. The author apologizes for any omissions or errors. If you are aware of any changes or additions that should be included in subse￾quent editions, please send them to Tom Pankratz, P.O. Box 75064, Houston, Texas USA, 77234-5064

Foreword The areas of environmental engineering and sciences and their related business activities have grown to the point that they overlap the professional and private lives of almost everyone As environmental issues become more complicated, so does the vocabulary required to understand and discuss them. This Environmental Engineer- ing Dictionary and Directory defines many terms that did not even exist a decade ago My own field of water reclamation and reuse is an example of a relatively new area of environmental engineering that has fostered the introduction of many new terms and technologies When considering advanced treatment of municipal and industrial wastewaters a repeated thesis has been that such a high quality effluent should be put to beneficial use rather than simply wasted. Today, technically proven treatment and purification processes exist to provide treated water of almost any quality desired. This offers a realistic framework for considering water reclamation and reuse in many parts of the world that are experiencing water shortages. Nonpotable water reuse applications such as agricultural and landscape irrigation, toilet flushing in large office buildings, and water for aesthetic and environmental purposes have become major options for planned water reuse Water reuse provides innovative and alternative options for agriculture, munic ipalities, and industries. However, water only one alternative in planning to meet future water resource needs. Conservation, efficient management and use of existing water supplies, and the development of new water resources based on watershed management or seawater desalination are examples of other alternatives As the field of environmental engineering continues to develop, so will the vocabulary required for its discussion and study. Our need to understand the envi- ronment and to better appreciate our relationship with nature is greater now than at any time in our history. Thus Toms book is particularly timely and relevant. Takashi asano, Ph.D. PE Adjunct Professor Department of Civil and Environmental Engineering

Foreword The areas of environmental engineering and sciences and their related business activities have grown to the point that they overlap the professional and private lives of almost everyone. As environmental issues become more complicated, so does the vocabulary required to understand and discuss them. This Environmental Engineer￾ing Dictionary and Directory defines many terms that did not even exist a decade ago. My own field of water reclamation and reuse is an example of a relatively new area of environmental engineering that has fostered the introduction of many new terms and technologies. When considering advanced treatment of municipal and industrial wastewaters, a repeated thesis has been that such a high quality effluent should be put to beneficial use rather than simply wasted. Today, technically proven treatment and purification processes exist to provide treated water of almost any quality desired. This offers a realistic framework for considering water reclamation and reuse in many parts of the world that are experiencing water shortages. Nonpotable water reuse applications, such as agricultural and landscape irrigation, toilet flushing in large office buildings, and water for aesthetic and environmental purposes have become major options for planned water reuse. Water reuse provides innovative and alternative options for agriculture, munic￾ipalities, and industries. However, water reuse is only one alternative in planning to meet future water resource needs. Conservation, efficient management and use of existing water supplies, and the development of new water resources based on watershed management or seawater desalination are examples of other alternatives. As the field of environmental engineering continues to develop, so will the vocabulary required for its discussion and study. Our need to understand the envi￾ronment and to better appreciate our relationship with nature is greater now than at any time in our history. Thus Tom’s book is particularly timely and relevant. Takashi Asano, Ph.D., P.E. Adjunct Professor Department of Civil and Environmental Engineering University of California at Davis

A a See"Angstrom(A) A&I Alternative and Innovative A/0 Wastewater treatment process for biological removal of nitrogen by USFil A2/0 Biological treatment process for phosphorus and nitrogen removal by USFil- ter/ Kruger A'CTM Biological wastewater treatment system by Baker Process- Municipal Division A /R Photocatalytic process to destroy VOCs by Trojan Technologies, Inc AA See"atomic absorption spectrophotometry(AA) AAEE American Academy of Environmental Engineers aaP Asbestos action program. AAPCo American ssociation of pesticide control officials AAQS Ambient air quality standard AARC Alliance for Acid Rain Control aa American association for the advancement of science ABA1o00 Alumina oxide for phosphate reduction by Selecto, Inc ABA2000 Alumina oxide for lead and heavy metals removal by Selecto, Inc ABA8000 Alumina oxide for fluoride removal by Selecto, Inc abandoned well A well whose use has been permanently discontinued or which is in a state of such disrepair that it cannot be used for its intended purpose abatement Reducing the degree or intensity of, or eliminating, pollution abattoir A place where animals are slaughtered for their meat and meat byproduct ABC Filter Automatic backwashable cartridge filter by USFilter/Rockford Abcor Ultrafiltration membrane product by Koch Membrane Systems, Inc. ABF Activated bio-filtration wastewater treatment system by Infilco Degremont ABF Traveling bridge type automatic backwashing gravity sand filter by Aqua- Aerobic Systems, Inc. abiocoen All of the geologic, climatic, and other nonliving elements of an eco- system. abiotic Nonliving elements in the environment. ABJM ABJ product group of Sanitaire Corp ablation The combined processes of glacial melting and evaporation which results in a net loss of ice The lower part of a glacier where the net loss of ice exceeds the net ABs (1) Acrylonitrile-butadiene-styrene. A black plastic material, used in the man- ufacture of pipes and other components (2) Alkyl-benzene-sulfonate. A sur- factant formerly used in synthetic detergents that resisted biological breakdown

A Å See “Angstrom (Å).” A&I Alternative and Innovative. A/O® Wastewater treatment process for biological removal of nitrogen by USFil￾ter/Krüger. A2/O® Biological treatment process for phosphorus and nitrogen removal by USFil￾ter/Krüger. A2C™ Biological wastewater treatment system by Baker Process — Municipal Division. A·I·R Photocatalytic process to destroy VOCs by Trojan Technologies, Inc. AA See “atomic absorption spectrophotometry (AA).” AAEE American Academy of Environmental Engineers. AAP Asbestos Action Program. AAPCO American Association of Pesticide Control Officials. AAQS Ambient air quality standards. AARC Alliance for Acid Rain Control. AAS American Association for the Advancement of Science. ABA1000® Alumina oxide for phosphate reduction by Selecto, Inc. ABA2000® Alumina oxide for lead and heavy metals removal by Selecto, Inc. ABA8000® Alumina oxide for fluoride removal by Selecto, Inc. abandoned well A well whose use has been permanently discontinued or which is in a state of such disrepair that it cannot be used for its intended purpose. abatement Reducing the degree or intensity of, or eliminating, pollution. abattoir A place where animals are slaughtered for their meat and meat byproducts. ABC Filter™ Automatic backwashable cartridge filter by USFilter/Rockford. Abcor® Ultrafiltration membrane product by Koch Membrane Systems, Inc. ABF Activated bio-filtration wastewater treatment system by Infilco Degremont, Inc. ABF Traveling bridge type automatic backwashing gravity sand filter by Aqua￾Aerobic Systems, Inc. abiocoen All of the geologic, climatic, and other nonliving elements of an eco￾system. abiotic Nonliving elements in the environment. ABJ™ ABJ product group of Sanitaire Corp. ablation The combined processes of glacial melting and evaporation which results in a net loss of ice. ablation zone The lower part of a glacier where the net loss of ice exceeds the net gain. ABS (1) Acrylonitrile-butadiene-styrene. A black plastic material, used in the man￾ufacture of pipes and other components. (2) Alkyl-benzene-sulfonate. A sur￾factant formerly used in synthetic detergents that resisted biological breakdown

absolute filter rating A filter rating which indicates that 99.9% of the particles larger than a specified size will be removed by the filter absolute humidity The total amount of water vapor present in the air, measured n grams per cubic meter. absolute pressure The total pressure in a system, equal to the sum of the gage pressure and atmospheric pressure absolute purity water Water with a specific resistance of 18.3 megohm-cm at absolute zero The lowest temperature possible: 0 on the Kelvin scale or approx imately -273C(459.7F). absorbate A substance used to soak up another substance. absorbed dose The amount of a chemical that enters the body of an exposed absorbent Any substance that exhibits the properties of absorption absorption The process of transferring molecules of gas, liquid, or a dissolved substance to the surface of a solid where it is bound by chemical or physical absorption field a trench or pit filled with gravel or loose rock designed to absorb epic tank effluent. ABw Traveling bridge type gravity sand filter by Infilco Degremont, Inc abyssal zone A zone of deep oceanic waters, generally deeper than 2000 meters and between the hadal and bathyal zones where light does not penetrate AC See"activated carbon AC Industrial wastewater treatment unit by Colloid Environmental Technologies ACA American conservation association acaricide A pesticide used to kill spiders, ticks, or mites ACBM Asbestos-containing building material Accelapak Modular water treatment plant by Infilco Degremont, Inc Accelator@ Solids contact clarifier with primary and secondary mixing zones by nfilco Degremont, Inc. Accelo Hi-Cap Filter underdrain block formerly offered by Infilco Degremont Accelo-Biox Modular wastewater treatment plant by Infilco Degremont, Inc Accel-o-FacTM Sewage treatment plant design by Lake Aid Systems acceptable risk The level of risk associated with minimal adverse effects, usually determined by a risk analysis Access Analytical Former name of IDEXX Laboratories, Inc. accessory species Species found in less than half but more than one quarter of the area covered by a plant community accident site The location of an unexpected occurrence, failure or loss, either at a plant or along a transportation route, resulting in a release of hazardous materials climatization The physiological and behavioral adjustments of an organism to changes in its Accofloco lon exchange media by Colloid Environmental Technologies Co

absolute filter rating A filter rating which indicates that 99.9% of the particles larger than a specified size will be removed by the filter. absolute humidity The total amount of water vapor present in the air, measured in grams per cubic meter. absolute pressure The total pressure in a system, equal to the sum of the gage pressure and atmospheric pressure. absolute purity water Water with a specific resistance of 18.3 megohm-cm at 25°C. absolute zero The lowest temperature possible; 0° on the Kelvin scale or approx￾imately –273°C (– 459.7°F). absorbate A substance used to soak up another substance. absorbed dose The amount of a chemical that enters the body of an exposed organism. absorbent Any substance that exhibits the properties of absorption. absorption The process of transferring molecules of gas, liquid, or a dissolved substance to the surface of a solid where it is bound by chemical or physical forces. absorption field A trench or pit filled with gravel or loose rock designed to absorb septic tank effluent. ABW® Traveling bridge type gravity sand filter by Infilco Degremont, Inc. abyssal zone A zone of deep oceanic waters, generally deeper than 2000 meters and between the hadal and bathyal zones where light does not penetrate. AC See “activated carbon.” AC® Industrial wastewater treatment unit by Colloid Environmental Technologies Co. ACA American Conservation Association. acaricide A pesticide used to kill spiders, ticks, or mites. ACBM Asbestos-containing building material. Accelapak® Modular water treatment plant by Infilco Degremont, Inc. Accelator® Solids contact clarifier with primary and secondary mixing zones by Infilco Degremont, Inc. Accelo Hi-Cap Filter underdrain block formerly offered by Infilco Degremont, Inc. Accelo-Biox® Modular wastewater treatment plant by Infilco Degremont, Inc. Accel-o-Fac™ Sewage treatment plant design by Lake Aid Systems. acceptable risk The level of risk associated with minimal adverse effects, usually determined by a risk analysis. Access Analytical Former name of IDEXX Laboratories, Inc. accessory species Species found in less than half but more than one quarter of the area covered by a plant community. accident site The location of an unexpected occurrence, failure or loss, either at a plant or along a transportation route, resulting in a release of hazardous materials. acclimatization The physiological and behavioral adjustments of an organism to changes in its environment. Accofloc® Ion exchange media by Colloid Environmental Technologies Co

accretion The increase in size of an inorganic body by the addition or accumulation of particles ACCU Air sampler by Rupprecht Patashnick AccuguardM Automated pH electrode cleaning and calibration module by bie. Accu-Mag Electromagnetic flow meter by USFilter/Wallace Tiernan accumulation zone The upper part of a glacier where net gain in ice exceeds the accumulator A tank installed in a circulating water system to allow for fluctuations in flow, temperature, pressure, or other variations in operation. AccuPac Cross-corrugated surface media for biological wastewater treatment by Brentwood Industries. Inc Accura- flo Flumes for measuring flows by Composite Structures Accu-TabTM Tablet chlorination system by Hammonds and PPG Industries, Inc Accuvac Chemical reagents in vacuum vials for chemical analysis of fluids by Hach Co ACE rule See"Any Credible Evidence rule(Ace rule). acetaldehyde An organic chemical formed during the disinfection of water, most commonly associated with the use of ozone as disinfectant. Chemical formula is Ch.CHo acetic acid A weak, organic acid contained in vinegar and used in the manufactur f organic chemicals and plastics. Also called"ethanoic acid. Chemical for mula is Ch cooH acetone A colorless, volatile liquid used in organic synthesis and as a commercial solvent. Chemical formula is CH, COCH ACFM Actual cubic feet per minute ACFTD Air cleaner fine test dust. Dust used to calibrate particle counters ACGIH American Conference of Governmental Industrial Hygienists ACH (1) See"air changes per hour(ACH). (2) See"aluminum chlorohydrate (ACH) AC American Concrete institute acid (1)A substance that can react with a base to form a salt. (2)A substance that can donate a hydrogen ion or proton acid deposition See“ acid rain?” acid mine drainage Drainage of water from areas that have been mined for coal or other mineral ores, usually having a low ph due to contact with sulfur- bearing material acid neutralizing capacity (ANC) Measure of the ability of water or soil to resist changes in pH acid rain Precipitation having an unusually low pH, generally attributed to the absorption of sulfur dioxide pollution in air. Also known as"acid de acid shock The biological disruption of an aquatic system that results from rapid acidification acid-forming bacteria Microbes that can metabolize complex organic compounds under anaerobic conditions, leading to the production of methane acidic The condition of water or soil that contains a sufficient amount of acid substances to lower the ph below 7.0

accretion The increase in size of an inorganic body by the addition or accumulation of particles. ACCU® Air sampler by Rupprecht & Patashnick. Accuguard™ Automated pH electrode cleaning and calibration module by BIF. Accu-Mag Electromagnetic flow meter by USFilter/Wallace & Tiernan. accumulation zone The upper part of a glacier where net gain in ice exceeds the net loss. accumulator A tank installed in a circulating water system to allow for fluctuations in flow, temperature, pressure, or other variations in operation. AccuPac® Cross-corrugated surface media for biological wastewater treatment by Brentwood Industries, Inc. Accura-flo® Flumes for measuring flows by Composite Structures. Accu-Tab™ Tablet chlorination system by Hammonds and PPG Industries, Inc.. Accuvac Chemical reagents in vacuum vials for chemical analysis of fluids by Hach Co. ACE rule See “Any Credible Evidence rule (ACE rule).” acetaldehyde An organic chemical formed during the disinfection of water, most commonly associated with the use of ozone as disinfectant. Chemical formula is CH3CHO. acetic acid A weak, organic acid contained in vinegar and used in the manufacture of organic chemicals and plastics. Also called “ethanoic acid.” Chemical for￾mula is CH3COOH. acetone A colorless, volatile liquid used in organic synthesis and as a commercial solvent. Chemical formula is CH3COCH3. ACFM Actual cubic feet per minute. ACFTD Air cleaner fine test dust. Dust used to calibrate particle counters. ACGIH American Conference of Governmental Industrial Hygienists. ACH (1) See “air changes per hour (ACH).” (2) See “aluminum chlorohydrate (ACH).” ACI American Concrete Institute. acid (1) A substance that can react with a base to form a salt. (2) A substance that can donate a hydrogen ion or proton. acid deposition See “acid rain.” acid mine drainage Drainage of water from areas that have been mined for coal or other mineral ores, usually having a low pH due to contact with sulfur￾bearing material. acid neutralizing capacity (ANC) Measure of the ability of water or soil to resist changes in pH. acid rain Precipitation having an unusually low pH, generally attributed to the absorption of sulfur dioxide pollution in air. Also known as “acid deposition.” acid shock The biological disruption of an aquatic system that results from rapid acidification. acid-forming bacteria Microbes that can metabolize complex organic compounds under anaerobic conditions, leading to the production of methane. acidic The condition of water or soil that contains a sufficient amount of acid substances to lower the pH below 7.0