Treatment and Disposal III wet areas, leachate treatment. use, and disposal represents one of the major I PIlI s of landfill operations-not only during the active life of the landfill but I I r a significant period of time after closure. Due to the cost implications, con- “II’I’tlble attention must be given to selecting the most environmentally responsible, I II ! -Ifective alternative for leachate treatment and disposal. The optimal treatmentI”1111 n may change over time as new technologies are developed, new regulations III promulgated, and/or leachate quality varies as a function oflandfill age.
Leachate-treatment needs depend upon the final disposition of the leachate. 1111111 disposal of leachate may be accomplished through co-disposal at a wastewa- It I II’ atment plant or through direct discharge, both of which could be preceded II~’ in-site treatment. Leachate treatment is often difficult because of high organic 111’1 th, irregular production rates and composition, variation in biodegradabil- II I And low phosphorous content (if biological treatment is considered). Several uuh rs have discussed leachate treatment options,”:” which are briefly summa- III. ! in Table 8-11. Generally, where on-site treatment and discharge is selected. I vrral unit processes are required to address the range of contaminants present.
1.11 ample, a leachate treatment facility at the AI Turi Landfill in Orange County, c’W York uses polymer coagulation, flocculation, and sedimentation, followed
II anaerobic biological treatment, two-stage aerobic biological treatment,and
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