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nnChap11.pptxSOLID AND HAZARDOUS WASTE - Moore
LIVING WITH THE EARTH
CHAPTER 11
SOLID & HAZARDOUS WASTE
SOLID AND HAZARDOUS WASTE - Moore
Objectives for this Chapter
A student reading this chapter will be able to:
1. Discuss and explain the consequences of improper solid waste disposal.
2. List and characterize the typical municipal waste stream.
3. Describe and discuss the methods of reducing the solid waste stream through reuse and recycling efforts.
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Objectives for this Chapter
A student reading this chapter will be able to:
4. Describe the methods of collection and disposal of municipal solid wastes including the benefits and problems associated with landfills and incinerators.
5. Differentiate the types of hazardous waste, and discuss reasons for proper disposal, giving some case examples.
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Objectives for this Chapter
A student reading this chapter will be able to:
6. List and describe the various methods of hazardous waste control emphasizing waste reduction, volume or hazard reduction, and long-term storage and disposal options.
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Objectives for this Chapter
A student reading this chapter will be able to:
7. Discuss the positive and negative aspects of clean-up efforts under “Superfund” and some of the major concerns regarding its future operation.
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SOLID & HAZARDOUS WASTE
INTRODUCTION
Cities have historically been centers for filth and disease, and many have degraded because of overpopulation.
Trash on the Yangtze river in China
Nairobi “The Stinking City in the Sun”
Western Europe up until the 19th Century
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Solid and Hazardous Waste
Much of the world continues to inappropriately dispose of refuse which:
(1) invites the proliferation of rodents and insects;
(2) becomes a source of contamination to groundwater;
(3) pollutes ambient air when combusted;
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Solid and Hazardous Waste
Much of the world continues to inappropriately dispose of refuse which:
(4) facilitates the spread of debris around the dumping site;
(5) lowers property values about the site; and
(6) encourages the spread of disease from microorganisms and toxic chemicals.
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Solid and Hazardous Waste
The Resource Conservation and Recovery Act (RCRA) of 1976 forbade open dumping and introduced the concept of the sanitary landfill.
Land fill siting and “NIMBY”
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Solid and Hazardous Waste
The USEPA endorsed several different practices to Reduce Municipal Solid Waste (MSW) that include:
(1) source reduction (including reuse of products and backyard composting of yard trimmings);
(2) recycling of materials (including composting); and
(3) waste combustion (preferably with energy recovery) and landfilling.
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DEFINITION AND CHARACTERIZATION OF MSW
Definition of MSW
Materials in MSW include paper and paperboard, yard trimmings, food wastes, plastics, glass, metal, and wood wastes.
Examples of the types of MSW in each of these categories is listed in Table 11-1.
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Table 11-1
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Characterization of MSW
MSW does not include everything that is landfilled in Subtitle D landfills (RCRA Subtitle D), but excludes municipal sludge, industrial non-hazardous waste, construction and demolition waste, agricultural waste, oil and gas waste, and mining wastes (Fig 11-1).
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Fig. 11-1
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Characterization of MSW
The total amount of MSW materials generated (thousands of tons) from 1960 to 1996 are shown in Figure 11-2.
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Fig. 11-2
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Characterization of MSW
Paper and paperboard materials represented the largest component at 13 percent, followed by food wastes (10.4%), and plastics (9.4%) (Fig. 11-3).
The amount of MSW generated in 1996 and categorized as products is shown as Figure 11-4.
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Fig. 11-3
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Fig. 11-4
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COLLECTION AND DISPOSAL OF SOLID WASTE
Collection of MSW
The removal of solid waste is the responsibility of government which must develop and enforce regulations that protect the public health by proper collection and disposal of municipal waste.
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Collection of MSW
Collection vehicles often include manually loaded compacting bodies which increases the weight (capacity) of the load that can be carried, and facilitates emptying at the disposal site (Fig 11-5, 6).
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Fig. 11-5
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Fig. 11-6
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Collection of MSW
A transfer station is a site where solid waste is concentrated before taken to a processing facility or a sanitary landfill (Fig. 11-7).
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Fig. 11-7
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Collection of MSW
The concentration most often involves compaction by placing the waste into a metal channel where a ram compresses the waste into a roll-off collection container (Fig. 11-8).
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Fig. 11-8
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Collection of MSW
Some transfer stations also feature recycling bins where separated items such as metal cans, plastic milk bottles (HDPE), paper and cardboard, and glass containers may be collected and periodically removed for further processing and resale (Fig 11-9).
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Fig. 11-9
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Management of MSW
Nationally, more than half (55 percent) of the total MSW collected is landfilled about 27.3 percent is recovered for recycling (or composted) and 17.2 percent is combusted with most combustion systems employing energy recovery (Fig. 11-10).
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Fig. 11-10
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Management of MSW
Landfill Design
Historically landfills have been sources of pollution, producers of methane gas and odors, and breeding sites for pests.
The standards for landfill construction mandated under RCRA Subtitle D should prevent the above problems (Fig. 11-11).
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Fig. 11-11
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Management of MSW
Landfill Design
The bottom liners may be composed of one or more layers of clay or a synthetic flexible membrane(s) (or some combination of both) (Fig. 11-12).
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Fig. 11-12
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Landfills are not secure
Landfill caps or covers are meant to be impermeable but can be disturbed by:
burrowing and soil-dwelling animals; roots of vegetation;
precipitation; freeze-thaw cycles; wind;
uneven settling; migration of chemicals of objects;
exposure to sunlight.
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Landfills are not secure
There are less than 2,400 municipal solid waste landfills today although the total landfill capacity has not declined considerably.
The Northeast United States has the fewest landfills (208) and the fewest remaining years of landfill capacity (Fig. 11-13).
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Fig. 11-13
Number of landfills by region
Typical landfill operation
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Source Reduction
Activities that reduce the amount of the toxicity of wastes prior to entering the waste stream are referred to as source reduction.
Products package reuse
Package or product redesign that reduces material or toxicity
Reducing use by modifying practices (Fig. 11-14)
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Fig. 11-14
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Recovery for Recycling (Including Composting)
The act of removing materials from MSW for a productive use is referred to as recycling or resource recovery.
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Recovery for Recycling (Including Composting)
Recycling is perceived to:
(1) conserve resources by reducing the need for virgin and nonrenewable materials;
(2) reduce the amount of pollution by using secondary materials that require less energy to process; and
(3) save energy by using recycled materials, since less is required for processing.
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Recovery for Recycling (Including Composting)
The Northeast serves more than 43 million people or over 80 percent of its population with a curbside recyclables program (Fig. 11-15).
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Fig. 11-15
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Recovery for Recycling (Including Composting)
Materials recycling facilities (MRFs) prepare recyclables for marketing (Fig. 11-16).
A magnet removes steel objects and recyclables are separated manually (Fig. 11-17).
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Fig. 11-16
.
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Fig. 11-17
Separating trash in an MRF
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Recovery for Recycling (Including Composting)
Glass bottles are separated into clear, brown, and green glass, and ground into small smooth pellets called cullet.
An example of green glass cullet is shown in Fig. 11-18.
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Fig. 11-18
Green glass cullet
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Trends in Resource Recovery
Recovery rates increased significantly from the mid-1980s to the present national level of over 27 percent (Fig. 11-19).
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Fig. 11-19
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Trends in Resource Recovery
Most of the recovery appears to be in paper and paperboard, accounting for nearly 57 percent of the material recovered.
This is followed by yard trimmings and food wastes which are composted (19.7 percent), and metals at 11.1 percent (Fig. 11-20).
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Fig. 11-20
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Composting
Composting is a controlled process of degrading organic matter by microorganisms into a humus-like material.
The composted material is often low in plant nutrients but is useful for conditioning soil by improving soil porosity and aeration, and increasing water retention.
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Composting
In some sophisticated operations, the entire process from shredding to aeration, curing, and finishing are performed in an in-vessel composting system (Fig. 11-21a, b).
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Fig. 11-21a
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Fig. 11-21b
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Composting
Most composting uses a windrow process in which rows of material are placed next to each other outdoors and periodically mixed to incorporate air into the mix (Fig. 11-22).
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Fig. 11-22
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Compost
Compost is being used for wetlands mitigation, land reclamation, storm filtrates, soil amendments, mulches, and low-grade fertilizers.
The market penetration of compost is likely to increase when combined with education on the benefits of compost use (Fig. 11-23).
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Fig.11-23
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Combustion
MSW can also be treated by combustion
Generally, combustion with the production of energy is called waste-to-energy (WTE), while combustion of MSW without energy recovery is called incineration.
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Combustion
WTE plants are generally mass burn, although many incorporate recycling activities that remove noncombustible items such as metals and glass prior to burning.
The facility is designed in stages to minimize emissions (Fig. 11-24).
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Fig. 11-24
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HAZARDOUS WASTES
Background
Love Canal
Times Beach, MO.
Woburn, MA.
Environmental Justice
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What is Hazardous Waste?
The Resource Conservation and Recovery Act (RCRA) of 1976.
The definition of hazardous waste in RCRA includes any discarded material that may pose a substantial threat or potential danger to human health or the environment when improperly handled.
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RCRA
This process is called the “cradle-to-grave” system and is meant to protect public health by:
(1) defining what wastes are hazardous;
(2) tracking wastes to the point of disposal;
(3) assuring that treatment, storage, and disposal (TSD) facilities meet minimum national standards;
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RCRA
This process is called the “cradle-to-grave” system and is meant to protect public health by:
(4) and making certain TSDs are properly maintained after closure, and that facility owner/operators are financially responsible for hazardous waste releases that may occur at their facility.
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Hazardous Waste Regulations
Amendments were made to RCRA in 1984 that significantly expanded its regulatory powers.
The amendments are known as the Hazardous and Solid Waste Amendments (HSWA).
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The Hazardous and Solid Waste Amendments (HSWA)
The HSWA focuses on protecting groundwater by:
(1) restricting the treatment, storage, and disposal of hazardous wastes in land management facilities;
(2) mandating stricter requirements for landfills accepting hazardous waste;
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The Hazardous and Solid Waste Amendments (HSWA)
The HSWA focuses on protecting groundwater by:
(3) requiring a schedule for determining if the landfilling of untreated hazardous waste should be phased out;
(4) increasing the numbers of people who fall under RCRA regulations by including small quantity generators; and
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The Hazardous and Solid Waste Amendments (HSWA)
The HSWA focuses on protecting groundwater by:
(5) creating a new program for the detection, control, and management of hazardous liquids (primarily petroleum) in underground storage tanks.
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Hazardous Waste Regulations
Other efforts to control hazardous waste are:
The Pollution Prevention Act of 1990
Waste Minimization National Plan
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The Management of Hazardous Wastes
The three major options for managing hazardous waste include:
(1) reducing the production of waste by reducing the amount generated or recycling/reusing the hazardous material after its generation;
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The Management of Hazardous Wastes
The three major options for managing hazardous waste include:
(2) reducing the volume and/or hazard off the waste; and
(3) long-term storage or disposal (Fig. 11-25).
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Fig. 11-25
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Reduction of Generation of Hazardous Waste
The generation of hazardous waste can be minimized by:
(1) eliminating or substituting raw materials for less hazardous ones;
(2) changing the manufacturing process to reduce or eliminate hazardous waste; and
(3) separating or segregating waste at the source to prevent the contamination of non-hazardous waste.
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Technologies for Hazardous Waste Treatment
Biological
Chemical
Physical
Solidification/Stabilization
Thermal Treatment
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Hazardous Waste Disposal
Landfills
Deep-well Injection
Surface Impoundments
Figure 11-26
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Fig. 11-26
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Cleaning Up
Before the 1980s, it was common practice for industries and municipalities to haul the wastes to a depression in the ground, dump them, and cover them over.
In many cases, drums of toxic wastes were simply stored in piles on-site (Fig. 11-27).
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Fig. 11-27
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Cleaning Up
In December of 1980, congress passed the Comprehensive Environmental Response, Compensation, and Liability Act (CERCLA).
This Act, also known as “Superfund”, authorized the federal government to spend $1.6 billion over a five year period for emergency clean-up activities.
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CERCLA
The term “Superfund” is attributed to the fact that the bill created a trust fund financed primarily by excise taxes on chemicals and oil, and an environment tax on corporations.
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CERCLA
The USEPA identifies Potentially Responsible Parties (PRPs).
The liability rules applied include: retroactive liability, joint and several liability, and strict liability (Fig. 11-28).
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Fig. 11-28
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Superfund
The USEPA established a hazard-ranking system (HRS) based on the estimated hazard potential of the hazardous waste site.
The factors used to make this estimate include the waste characteristics; the distance to the local population, surface water, groundwater, and drinking water supplies.
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Superfund
Environmental groups and concerned citizens charged that RCRA was not being vigorously enforced.
Congress responded by passing the Superfund Amendments and Reauthorization Act of 1986 (SARA), which increased the program’s funding and provided new and stricter standards.
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Superfund
There are nearly 33,000 hazardous waste sites that have come under Superfund authority.
More than 1300 of these sites are on the USEPA’s National Priority List (NPL).
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Superfund
In 1997, nearly 500 of the 1,405 sites listed were in the stage of construction completion with nearly 55 sites where remedial assessment had not yet started (Fig. 11-29).
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Fig. 11-29
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Superfund
The most recent listing (February 10, 1998) shows there are 1,191 sites on the NPL, reflecting the removal of cleanup completions.
