Leachate collection systems

Reduce Head on Liner and/or in Leachate Collection System Inspect Leachate Collection/Removal System or French Drain Repair Leachate Collection/Removal System or French Drain Temporary Cap... 

Case 2 - The Hyde Park Landfill site, located in an industrial complex in the extreme northwest corner of Niagara, New York, was used from 1953 to 1975 as a disposal site for an estimated 80,000 tons of chemical waste, including chlorinated hydrocarbons. A compacted clay cover was installed in 1978 over the landfill and a tile leachate collection system was installed in 1979. Hazardous compounds such as ortho-, meta- and para-chlorobenzoic acid toluene ortho- and meta-chlorotoluene 3,4-dichlorotoluene and 2,6-dichlorotoluene were detected in the leachate (Irvine et al., 1984). Since 1979, the existing leachate treatment system has used activated carbon as the technology for removing organic carbon. Although... 

FIGURE 26.1 Schematic of a double-liner and leachate collection system for a hazardous landfill. (Adapted from U.S. EPA, Training Module Introduction to Land Disposal Units, EPA530-K-05-014, U.S. Environmental Protection Agency, Washington, DC, September 2005.)... 

Leachate collection system between liners o o Top liner designed, constructed, and operated to prevent migration—AL PCCP Leachate collection system between o liners o... 

Figure 26.16 is a profile of a liner according to U.S. EPA s MTG. The minimum hydraulic conductivity in the secondary leachate collection system is 1 x 10 2 cm/s. To meet this requirement, either a granular material or a net made of synthetic material must be used to build the secondary leachate collection system. 

The secondary leachate collection system is accessed by collection standpipes that must penetrate the primary liner. There are two methods of making these penetrations rigid or flexible. In the rigid penetrations, concrete anchor blocks are set behind the pipe with the membranes anchored to the concrete. Flexible penetrations are preferred since these allow the pipe to move without damaging the liner. In either case, standpipes should not be welded to the liners. If a vehicle hits a pipe, there is a high potential for creating major tears in the liner at depth. 

The drainage materials for the liquid management system must allow for unimpeded flow of liquids for the intended lifetime of the facility. In a leachate collection system, the drains may consist of pipes, soil (gravel), geonets, or geocomposites. 

Other disposal options for the sewage sludge are landfill, dumping at sea (forbidden in the EU since 1998) [30], and incineration. The most popular for solid waste disposal is landfill. However, many of the disposal sites are open dumps without protective barriers or leachate-collection systems, which represent a potential risk to the quality of the nearby groundwater. 

Double Liners and Leachate Collection Systems for Hazardous Waste Disposal Units Subparts M, N, and O Land Treatment, Landfills, and Incinerators... 

Waste disposal is a serious problem for many chemical plants. The EPA initiative that has greatly curtailed land disposal has had a great effect on waste disposal. The 1984 Resource Conservation and Recovery Act (RCRA) amendments have also made it more difficult to dispose of solid wastes. In addition, RCRA required all interim status hazardous-waste facilities to meet ground-water monitoring and insurance requirements by late 1985. This included hazardous-waste surface impoundments. Since 1988, a double liner and leachate collection system have also been required. 

The United States Environmental Protection Agency (EPA) requires all new landfills to include a leachate collection system. Recirculation of leachate accelerates the decomposition of solid waste. Another alternative use of landfills is to capture the methane gas produced during decomposition to generate electricity. For example, in Yolo County, California, a landfill releases 1.4 million cubic feet of gas a day used to generate electricity. 

In recent years there has been a trend away from numerous, small disposal sites toward fewer and larger sites. The size of a disposal site should be based on the attenuation capacity of the geologic material, which has a finite, though generally not well-defined, limit. For slowly degradable wastes, engineered sites with leachate-collection systems appear to be only a temporary solution since the leachate collected will also require final disposal. 

The current guidelines require, in addition to a permeability barrier, a minimum distance of commonly 150 m from the nearest water well. To protect surface water, siting on a floodplain is prohibited, surface runoff must be controlled, and the site must be at least 150 m from any body of surface water. If a site does not meet these criteria, engineered modifications in accordance with certain guidelines may be implemented to enhance site conditions. Such modifications frequently involve a liner and a leachate-collection system. 

CES This closure evaluation system consists of three systems to aid in review of closure plans regarding vegetation cover, final cover, and leachate collection system (prototype). PC-Plus Knowledge-Pro Micro D. Greathouse/EPA/RREL... 

Finally, the Army conducted a study to examine the effectiveness of windrow composting. This study used cow manure, sawdust, and potato waste amendments and required the construction of a concrete pad leachate collection system. Temperatures were maintained at 55°C and the compost was turned once a day. This process produced 98% reductions of explosives contamination within twenty days, and degraded HMX,... 

The liner must be constructed of materials with appropriate strength thickness and chemical properties to prevent physical contact and withstand pressure gradients. There should be a leachate collection system above and between the liners. 

Figure 10. Composite liner and leachate collection system design in unapproved...

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