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Advances in Hazardous Industrial Waste Treatment
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© 2009 by Taylor & Francis Group, LLC
72307_C000.indd i 7/23/2008 7:10:55 PM
© 2009 by Taylor & Francis Group, LLC
EDITED BY
LAWRENCE K. WANG
NAZIH K. SHAMMAS
YUNG-TSE HUNG
CRC Press is an imprint of the
Taylor & Francis Group, an informa business
Boca Raton London New York
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© 2009 by Taylor & Francis Group, LLC
MATLAB® is a trademark of The MathWorks, Inc. and is used with permission. The MathWorks does not warrant the
accuracy of the text or exercises in this book. This book’s use or discussion of MATLAB® software or related products
does not constitute endorsement or sponsorship by The MathWorks of a particular pedagogical approach or particular
use of the MATLAB® software.
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© 2009 by Taylor & Francis Group, LLC
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Library of Congress Cataloging-in-Publication Data
Advances in hazardous industrial waste treatment / edited by Lawrence K. Wang, Nazih K. Shammas,
Yung-Tse Hung.
p. cm.
Includes bibliographical references and index.
ISBN-13: 978-1-4200-7230-3
ISBN-10: 1-4200-7230-7
1. Factory and trade waste. 2. Hazardous waste. 3. Hazardous waste site remediation. I. Wang,
Lawrence K. II. Shammas, Nazih K. III. Hung, Yung-Tse. IV. Title.
TD897.A38 2008
628.4’2--dc22 2008008265
Visit the Taylor & Francis Web site at
http://www.taylorandfrancis.com
and the CRC Press Web site at
http://www.crcpress.com
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© 2009 by Taylor & Francis Group, LLC
v
Contents
Preface ........................................................................................................................................ vii
About the Editors ...................................................................................................................... ix
Contributors .............................................................................................................................. xi
Chapter 1 Characteristics of Hazardous Industrial Waste .................................................... 1
Nazih K. Shammas
Chapter 2 Soil Remediation .................................................................................................. 35
Ioannis Paspaliaris, Nymphodora Papassiopi, Anthimos Xenidis,
and Yung-Tse Hung
Chapter 3 Remediation of Soils Contaminated with Metals ................................................ 87
Nazih K. Shammas
Chapter 4 Treatment of Wastes from Metal Finishing Industry ........................................... 139
Nazih K. Shammas and Lawrence K. Wang
Chapter 5 Leachate Treatment Using Bioremediation .......................................................... 175
Azni Idris, Katayon Saed, and Yung-Tse Hung
Chapter 6 Remediation of Sites Contaminated by Hazardous Wastes ................................. 193
Lawrence K. Wang, Nazih K. Shammas, Ping Wang, and Robert LaFleur
Chapter 7 Enzymatic Removal of Aqueous Pentachlorophenol ........................................... 273
Khim Hoong Chu, Eui Yong Kim, and Yung-Tse Hung
Chapter 8 Remediation of Sites Contaminated by Underground Storage
Tank Releases ....................................................................................................... 291
Lawrence K. Wang, Nazih K. Shammas, Ping Wang, and Nicholas L. Clesceri
Chapter 9 Biological Treatment Processes for Urea and Formaldehyde
Containing Wastewater ........................................................................................ 363
José Luis Campos Gómez, Anuska Mosquera Corral,
Ramón Méndez Pampín, and Yung-Tse Hung
Chapter 10 Hazardous Waste Deep-Well Injection ................................................................ 385
Nazih K. Shammas and Lawrence K. Wang
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© 2009 by Taylor & Francis Group, LLC
vi Contents
Chapter 11 Waste Management in the Pulp and Paper Industry ............................................ 461
Nazih K. Shammas
Chapter 12 Treatment of Nickel-Chromium Plating Waste .................................................... 517
Nazih K. Shammas, Lawrence K. Wang, Donald B. Aulenbach,
and William A. Selke
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© 2009 by Taylor & Francis Group, LLC
vii
Preface
Environmental managers, engineers, and scientists who have had experience with industrial and
hazardous waste management problems have noted the need for a handbook series that is comprehensive in its scope, directly applicable to daily waste management problems of specifi c industries,
and widely acceptable by practicing environmental professionals and educators.
Many standard industrial waste treatment and hazardous waste management texts adequately
cover a few major industries, for conventional in-plant pollution control strategies, but no one book,
or series of books, focuses on new developments in innovative and alternative cleaner production
technologies, waste minimization methodologies, environmental processes, design criteria, effluent
standards, performance standards, pretreatment standards, managerial decision methodology, and
regional and global environmental conservation.
The entire Industrial and Hazardous Wastes Treatment book series emphasizes in-depth
presentation of environmental pollution sources, waste characteristics, control technologies, management strategies, facility innovations, process alternatives, costs, case histories, effluent standards,
and future trends for each industrial or commercial operation, such as the metal plating and finishing industry or the photographic processing industry, and in-depth presentation of methodologies,
technologies, alternatives, regional effects, and global effects of each important industrial pollution
control practice that may be applied to all industries, such as industrial ecology, pollution prevention,
in-plant hazardous waste management, site remediation, groundwater decontamination, and stormwater management.
In a deliberate effort to complement other industrial waste treatment and hazardous waste
management texts published by Taylor & Francis and CRC Press, this book, Advances in Hazardous
Industrial Waste Treatment, covers many new industries and new waste management topics, such as
characteristics of industrial hazardous wastes, soil remediation, treatment of metal finishing industry
wastes, leachate treatment using bioremediation, remediation of sites contaminated by hazardous
wastes, enzymatic removal of aqueous pentachlorophenol, remediation of sites contaminated by
underground storage tank releases, biological treatment of wastes containing urea and formaldehyde, hazardous waste deep-well injection, waste management in the pulp and paper industry, and
treatment of nickel-chromium plating waste, are presented in detail. Special efforts were made to
invite experts to contribute chapters in their own areas of expertise. Since the field of industrial
hazardous waste treatment is very broad, no one can claim to be an expert in all industries, and so
collective contributions are better than a single author’s presentation for a handbook of this nature.
This book is to be used as a college textbook as well as a reference book for the environmental
professional. It features the major metal manufacturing, forming, coating and finishing industries
and hazardous pollutants that have significant effects on the environment. Professors, students, and
researchers in environmental, civil, chemical, sanitary, mechanical, and public health engineering
and science will find valuable educational materials here. The extensive bibliographies for each
metal-related industrial waste treatment or practice should be invaluable to environmental managers
or researchers who need to trace, follow, duplicate, or improve on a specifi c industrial hazardous
waste treatment practice.
A successful modern industrial hazardous waste treatment program for a particular industry
will include not only traditional water pollution control but also air pollution control, noise control,
soil conservation, site remediation, radiation protection, groundwater protection, hazardous waste
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© 2009 by Taylor & Francis Group, LLC
viii Preface
management, solid waste disposal, and combined industrial–municipal waste treatment and management. In fact, it should be a total environmental control program. Another intention of this handbook
is to provide technical and economical information on the development of the most feasible total
environmental control program that can benefi t both industry and local municipalities. Frequently,
the most economically feasible methodology is a combined industrial–municipal waste treatment.
Lawrence K. Wang, New York
Nazih K. Shammas, Massachusetts
Yung-Tse Hung, Ohio
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© 2009 by Taylor & Francis Group, LLC
ix
About the Editors
Lawrence K. Wang has over 25 years of experience in facility design, plant construction, operation, and management. He has expertise in water supply, air pollution control, solid waste disposal,
water resources, waste treatment, hazardous waste management and site remediation. He is a retired
dean/director of both the Lenox Institute of Water Technology and Krofta Engineering Corporation,
Lenox, Massachusetts, and a retired VP of Zorex Corporation, Newtonville, New York. Dr. Wang is
the author of over 700 papers and 17 books, and is credited with 24 U.S. patents and 5 foreign
patents. He received his BSCE degree from National Cheng-Kung University, Taiwan, ROC, his MS
degrees from both the University of Missouri at Rolla and the University of Rhode Island at
Kingston, and his PhD degree from Rutgers University, New Brunswick, New Jersey.
Nazih K. Shammas is an environmental expert, professor and consultant for over forty years.
He is an ex-dean and director of the Lenox Institute of Water Technology, and advisor to Krofta
Engineering Corporation, Lenox, Massachusetts. Dr. Shammas is the author of over 250 publications and eight books in the field of environmental engineering. He has experience in environmental
planning, curriculum development, teaching and scholarly research, and expertise in water quality
control, wastewater reclamation and reuse, physicochemical and biological treatment processes and
water and wastewater systems. He received his BE degree from the American University of Beirut,
Lebanon, his MS from the University of North Carolina at Chapel Hill, and his PhD from the
University of Michigan at Ann Arbor.
Yung-Tse Hung has been a professor of civil engineering at Cleveland State University since 1981.
He is a Fellow of the American Society of Civil Engineers. He has taught at 16 universities in
eight countries. His primary research interests and publications have been involved with biological
wastewater treatment, industrial water pollution control, industrial waste treatment, and municipal
wastewater treatment. He is now credited with over 450 publications and presentations on water and
wastewater treatment. Dr. Hung received his BSCE and MSCE degrees from National Cheng-Kung
University, Taiwan, and his PhD degree from the University of Texas at Austin. He is the editor of
International Journal of Environment and Waste Management, International Journal of
Environmental Engineering, and International Journal of Environmental Engineering Science.
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© 2009 by Taylor & Francis Group, LLC
xi
Contributors
Donald B. Aulenbach
Lenox Institute of Water Technology
Lenox, Massachusetts
and
Rensselaer Polytechnic Institute
Troy, New York
Khim Hoong Chu
Department of Chemical and
Process Engineering
University of Canterbury
Christchurch, New Zealand
Nicholas L. Clesceri
Rensselaer Polytechnic Institute
Troy, New York
Anuska Mosquera Corral
Department of Chemical Engineering
School of Engineering
University of Santiago de Compostela
Santiago de Compostela, Spain
José Luis Campos Gómez
Department of Chemical Engineering
School of Engineering
University of Santiago de Compostela
Santiago de Compostela, Spain
Yung-Tse Hung
Department of Civil and Environmental
Engineering
Cleveland State University
Cleveland, Ohio
Azni Idris
Department of Chemical and Environmental
Engineering
Universiti Putra Malaysia, Serdang
Selangor, Malaysia
Eui Yong Kim
Department of Chemical Engineering
University of Seoul
Seoul, Korea
Robert LaFleur
Rensselaer Polytechnic Institute
Troy, New York
Ramón Méndez Pampin
Department of Chemical Engineering
School of Engineering
University of Santiago de Compostela
Santiago de Compostela, Spain
Nymphodora Papassiopi
School of Mining Engineering and Metallurgy
National Technical University of Athens
Athens, Greece
Ioannis Paspaliaris
School of Mining Engineering and Metallurgy
National Technical University of Athens
Athens, Greece
Katayon Saed
Building and Environmental Division
School of Engineering
Ngee Ann Polytechnic
Singapore
William A. Selke
Lenox Institute of Water Technology and
Krofta Engineering Corporation
Lenox, Massachusetts
Nazih K. Shammas
Lenox Institute of Water Technology and
Krofta Engineering Corporation
Lenox, Massachusetts
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© 2009 by Taylor & Francis Group, LLC
xii Contributors
Lawrence K. Wang
Lenox Institute of Water Technology and
Krofta Engineering Corporation
Lenox, Massachusetts
and
Zorex Corporation
Newtonville, New York
Ping Wang
Center of Environmental Sciences
University of Maryland
Annapolis, Maryland
Anthimos Xenidis
School of Mining Engineering and
Metallurgy
National Technical University of Athens
Athens, Greece
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© 2009 by Taylor & Francis Group, LLC
1
1 Characteristics of Hazardous
Industrial Waste
Nazih K. Shammas
CONTENTS
1.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
1.2 Hazardous Waste Identification Process . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
1.3 Exclusions from Solid and Hazardous Wastes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.3.1 Recycled Materials . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
1.3.2 Secondary Materials . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
1.3.3 Sham Recycling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
1.3.4 Exemptions from Hazardous Wastes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
1.4 Definition of Hazardous Waste . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
1.4.1 Hazardous Waste Listings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
1.4.2 Hazardous Waste Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
1.4.3 Listed Hazardous Wastes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
1.4.4 Listing Criteria . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
1.4.5 The F List: Wastes from Nonspecific Sources . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
1.4.6 The K List: Wastes from Specific Sources . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
1.4.7 The P and U Lists: Discarded Commercial Chemical Products . . . . . . . . . . . . . . 21
1.5 Characteristic Hazardous Wastes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
1.5.1 Ignitability . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
1.5.2 Corrosivity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
1.5.3 Reactivity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
1.5.4 Toxicity Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
1.6 Wastes Listed Solely for Exhibiting the Characteristic of Ignitability,
Corrosivity, or Reactivity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
1.7 The Mixture and Derived-from Rules . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
1.7.1 Background . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
1.7.2 Listed Hazardous Wastes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
1.7.3 Characteristic Wastes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
1.7.4 Waste Listed Solely for Exhibiting the Characteristic of Ignitability,
Corrosivity, or Reactivity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
1.7.5 Mixture Rule Exemptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
1.7.6 Derived-from Rule Exemptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
1.7.7 Delisting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
1.8 The Contained-in Policy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
1.9 Regulatory Developments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
1.9.1 The Hazardous Waste Identification Rules . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
1.9.2 Final Hazardous Waste Listing Determinations . . . . . . . . . . . . . . . . . . . . . . . . . . 31
1.9.3 Proposed Revision to Wastewater Treatment Exemption for
Hazardous Waste Mixtures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
References . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
© 2009 by Taylor & Francis Group, LLC
2 Advances in Hazardous Industrial Waste Treatment
1.1 INTRODUCTION
The improper management of hazardous waste poses a serious threat to both the health of people
and the environment. When the United States Environmental Protection Agency (U.S. EPA) began
developing the hazardous waste management regulations in the late 1970s, the Agency estimated
that only 10% of all hazardous waste was managed in an environmentally sound manner.
Proper identification of a hazardous waste can be a difficult and confusing task, as the Resource
Conservation and Recovery Act (RCRA) regulations establish a complex definition of the term
“hazardous waste.” To help make sense of what is and is not a hazardous waste, this chapter presents
the steps involved in the process of identifying, or “characterizing,” a hazardous waste.
This chapter will introduce the entire hazardous waste identification process, but will focus
particularly on the final steps and the characteristics and properties of hazardous wastes. After reading this chapter, one will be able to understand the hazardous waste identification process and the
definition of hazardous waste, and be familiar with the following concepts:
1. Hazardous waste listings
2. Hazardous waste characteristics
3. The “mixture” and “derived-from” rules
4. The “contained-in” policy
5. The Hazardous Waste Identification Rules (HWIR)
1.2 HAZARDOUS WASTE IDENTIFICATION PROCESS
A hazardous waste is a waste with a chemical composition or other properties that make it capable
of causing illness, death, or some other harm to humans and other life forms when mismanaged or
released into the environment.1 Developing a regulatory program that ensures the safe handling of
such dangerous wastes, however, demands a far more precise definition of the term. U.S. EPA therefore created a series of hazardous waste identification regulations, which outline the process to
determine whether any particular material is a hazardous waste for the purposes of RCRA.
Proper hazardous waste identification is essential to the success of the hazardous waste
management program. The RCRA regulations require that any person who produces or generates a
waste must determine if that waste is hazardous. For this purpose, the RCRA includes the following
steps in the hazardous waste identification process2:
1. Is the waste a “solid waste”?
2. Is the waste specifically excluded from the RCRA regulations?
3. Is the waste a “listed” hazardous waste?
4. Does the waste exhibit a characteristic of hazardous waste?
Hazardous waste identification begins with an obvious point: in order for any material to be a
hazardous waste, it must first be a waste. However, deciding whether an item is or is not a waste is
not always easy. For example, a material (like an aluminum can) that one person discards could
seem valuable to another person who recycles that material. U.S. EPA therefore developed a set of
regulations to assist in determining whether a material is a waste. RCRA uses the term “solid waste”
in place of the common term “waste.” Under RCRA, the term “solid waste” means any waste,
whether it is a solid, semisolid, or liquid. The first section of the RCRA hazardous waste identification regulations focuses on the definition of solid waste. For this chapter, you need only understand
in general terms the role that the definition of solid waste plays in the RCRA hazardous waste
identification process.
Only a small fraction of all RCRA solid wastes actually qualify as hazardous wastes. According
to U.S. EPA estimates, of the 12 billion tons (metric) of industrial, agricultural, commercial, and
© 2009 by Taylor & Francis Group, LLC
Characteristics of Hazardous Industrial Waste 3
household wastes generated annually, 254 million tons (2%) are hazardous, as defined by RCRA
regulations.3 At first glance, one would imagine that distinguishing between hazardous and nonhazardous wastes is a simple matter of chemical and toxicological analysis. Other factors must be
considered, however, before evaluating the actual hazard posed by a waste’s chemical composition.
Regulation of certain wastes may be impractical, unfair, or otherwise undesirable, regardless of
the hazards they pose. For instance, household waste can contain dangerous chemicals, such as
solvents and pesticides, but making households subject to the strict RCRA waste management
regulations would create a number of practical problems. Congress and U.S. EPA have exempted
or excluded certain wastes, including household wastes, from the hazardous waste definition and
regulations. Determining whether or not a waste is excluded or exempted from hazardous waste
regulation is the second step in the RCRA hazardous waste identification process. Only after
determining that a solid waste is not somehow excluded from hazardous waste regulation should
the analysis proceed to evaluate the actual chemical hazard of a waste.
The final steps in the hazardous waste identification process determine whether a waste poses a
sufficient chemical or physical hazard to merit regulation. These steps in the hazardous waste
identification process involve evaluating the waste in light of the regulatory definition of hazardous
waste. The remainder of this chapter explains the definition, characteristics, and properties of
hazardous wastes.
1.3 EXCLUSIONS FROM SOLID AND HAZARDOUS WASTES
The statutory definition points out that whether a material is a solid waste is not based on the
physical form of the material (i.e., whether or not it is a solid as opposed to a liquid or gas), but rather
that the material is a waste. The regulations further define solid waste as any material that is
discarded by being either abandoned, inherently waste-like, a certain military munition, or recycled
(Figure 1.1). These terms are defined as follows:
1. Abandoned. This simply means “thrown away.” A material is abandoned if it is disposed
of, burned, or incinerated.
2. Inherently waste-like. Some materials pose such a threat to human health and the
environment that they are always considered solid wastes; these materials are considered to
be inherently waste-like. Examples of inherently waste-like materials include certain
dioxin-containing wastes.
FIGURE 1.1 Determination of whether a waste is a solid waste. Source: U.S. EPA, Resource Conservation and
Recovery Act—Orientation Manual, Report EPA 530-R-02-016, U.S. EPA, Washington, DC, January 2003.
Is material discarded by being either
No
Yes
Material is a solid waste
and may be a hazardous
waste subject to RCRA
Subtitle C regulation
Material is not a
solid waste and is
not subject to
RCRA Subtitle C
regulation
• Abandoned?
• Inherently waste-like?
• A discarded military munition?
• Recycled?
© 2009 by Taylor & Francis Group, LLC
4 Advances in Hazardous Industrial Waste Treatment
3. Military munitions. Military munitions are all ammunition products and components
produced for or used by the U.S. Department of Defense (DOD) or U.S. Armed Services
for national defense and security. Unused or defective munitions are solid wastes when
abandoned (i.e., disposed of, burned, incinerated) or treated prior to disposal; rendered
nonrecyclable or nonuseable through deterioration; or declared a waste by an authorized
military official. Used (i.e., fired or detonated) munitions may also be solid wastes if
collected for storage, recycling, treatment, or disposal.
4. Recycled. A material is recycled if it is used or reused (e.g., as an ingredient in a process),
reclaimed, or used in certain ways (used in a manner constituting disposal, burned for
energy recovery, or accumulated speculatively).
1.3.1 RECYCLED MATERIALS
Materials that are recycled are a special subset of the solid waste universe. When recycled, some
materials are not solid wastes, and therefore not hazardous wastes, but others are solid and hazardous waste, but are subject to less-stringent regulatory controls. The level of regulation that applies to
recycled materials depends on the material and the type of recycling (Figure 1.2). Because some
types of recycling pose threats to human health and the environment, RCRA does not exempt all
recycled materials from the definition of solid waste. As a result, the manner in which a material is
recycled will determine whether or not the material is a solid waste, and therefore whether it is
FIGURE 1.2 Determination of whether recycled wastes are hazardous wastes. Source: U.S. EPA, Resource
Conservation and Recovery Act—Orientation Manual, Report EPA 530-R-02-016, U.S. EPA, Washington,
DC, January 2003.
Is waste recycled by being
Is recycled waste
Waste is not a solid waste
Waste is a solid waste
No
No
Yes
Yes
Yes
Is waste reclaimed?
• Used as an ingredient?
• Used in a manner constituting disposal?
• Spent material
Facility must determine if waste is a
• Sludge
• Byproduct
• Commercial chemical product
• Scrap metal
• Burned for energy recovery, used to
produce a fuel, or contained in fuels?
• Accumulated speculatively?
• A dioxin-containing waste considered
inherently waste-like?
• Used as a product substitute?
• Returned to the production process?