Goal-based waste management strategy to reduce persistence of contaminants in leachate at municipal solid waste landfills |
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Authors: | Berrin Tansel Banu Sizirici Yildiz |
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Institution: | (1) Civil and Environmental Engineering Department, Florida International University, Miami, FL 33174, USA;(2) Civil Engineering Department, Case Western Reserve University, Cleveland, OH 44106, USA |
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Abstract: | The required minimum 30-year post-closure care period for municipal solid waste (MSW) landfills can be shortened by reducing
or eliminating of MSW components with long-terms effect in gas and leachate. The objectives of this study were to evaluate
the relative persistence of landfill gas, leachate quantity, and selected leachate parameters using post-closure monitoring
data from a case study landfill in south Florida. The relative persistence of selected decomposition byproducts in leachate
were evaluated by both zero order and first order models based on monitoring data from the case study landfill. The analyses
show that although gas and leachate production rates diminish very quickly, some contaminants remain in leachate as the decomposition
process continues at a slower rate. For the case study landfill, the parameters which have been detected consistently at high
concentrations (above MCL) included chloride, TDS, iron, bicarbonate, benzene, and vinyl chloride. Among these, vinyl chloride
has the fastest and TDS has the slowest rate of disappearance in the landfill environment. The effect of waste diversion on
persistence times of the selected persistent leachate quality parameters was evaluated. For example, a 40% reduction in the
amount of plastics deposited in the landfill could reduce the monitoring time for benzene from 59 to 39 years. Zero order
model underestimates the persistence times of the contaminants in leachate due to its linear nature. Shortening the monitoring
times can provide significant savings for municipalities who need to continue monitoring leachate quality until the MCL levels
are reached. |
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