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- W2183656186 abstract "As landfills commence extracting and beneficially using landfill gas for energy, the quality of leachate and the associated condensate from gas treatment causes constituents in the wastewaters to increase, often significantly. BOD, COD, ammonia and other constituent concentrations, such as phenol, VOCs (both chlorinated and non-chlorinated) and PCBs may increase by up to an order of magnitude or more. Depending on the disposition of the leachate, these increased constituents may cause the leachate (with blending of the gas condensate) to cause effluent violations. This increase may cause landfill operators to retrofit leachate treatment systems to address these issues, and the problems are significant from both an operation and cost perspective. The constituent concentrations also exhibit a wide variability relating to which gas wells are in use and their balancing, gas withdrawn from active versus legacy cells, precipitation, temperature, and other factors. The gas wells serve as a vertical conduit for younger, stronger leachate to be collected compared with a mature leachate that has had more residence time before collection, and thus has further degraded. A number of technologies have been used to improve the quality of the leachate/condensate at landfills without gas well, and alternative technologies may be used at landfills employing gas well pumping and gas condensate compared to landfills without these uses. Alternatives for both off-site and on-site management alternatives include hauling to an off-site location; leachate recirculation; constructed wetland treatment; phytoremediation; physical/chemical treatment such as precipitation, ion exchange, and reverse-osmosis membrane treatment; and leachate evaporation. Biological treatment may be a component of the previous technologies, or used as a stand-alone alternative. Cost implications for alternative technologies are site dependent, but guidelines are presented for generalized site alternative costs and a structured evaluation method for ranking alternatives is shown at the end of this paper." @default.
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- W2183656186 date "2014-01-01" @default.
- W2183656186 modified "2023-09-26" @default.
- W2183656186 title "Leachate Treatment Methods When Gas Wells Are Aggressively Pumped" @default.
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