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Release behavior of chloride from MSW landfill simulation reactors with different operation modes
Yuyang Long1, Dongyun Liu1, Jing Xu1
1Zhejiang Provincial Key Laboratory of Solid Waste Treatment and Recycling, School of Environmental Science and Engineering, Zhejiang Gongshang University, Hangzhou 310012, China.
Waste Management (New York, N.Y.)
|April 25, 2018
Summary
Landfill operation mode significantly impacts chloride ion (Cl-) release. Semi-aerobic modes with leachate recirculation show lower Cl- pollution risk compared to anaerobic modes.
Area of Science:
- Environmental Science
- Waste Management
- Geochemistry
Background:
- Chloride ion (Cl-) is a common anion with high ecological toxicity and non-biodegradability.
- Cl- can migrate from landfills into the surrounding environment, posing ecological risks.
- Understanding Cl- release behavior is crucial for effective landfill management.
Purpose of the Study:
- To investigate the influence of different landfill operation modes on chloride ion (Cl-) release.
- To compare Cl- release patterns under anaerobic, semi-aerobic, and leachate recirculation conditions.
- To assess the ecological pollution risk associated with Cl- release from various landfill configurations.
Main Methods:
- Four lab-scale landfill simulation reactors were established to mimic different operational modes.
- Reactors operated under anaerobic, semi-aerobic, anaerobic with leachate recirculation, and semi-aerobic with leachate recirculation conditions.
- Chloride ion (Cl-) release amounts and leachate concentrations were monitored over 256 days.
Main Results:
- Landfill operation modes significantly influenced Cl- release, with cumulative releases varying widely across the four reactors.
- Semi-aerobic modes generally exhibited lower Cl- concentrations and lower COD/Cl and NH4-N/Cl ratios than anaerobic modes.
- Leachate recirculation helped maintain a dynamic equilibrium for Cl- release, while air intrusion in anaerobic landfills led to sharp increases in Cl- concentration.
Conclusions:
- Semi-aerobic landfill operation modes present a lower chloride ion (Cl-) pollution risk compared to anaerobic modes.
- Leachate recirculation is an effective strategy for managing and stabilizing Cl- release from landfills.
- Controlling air intrusion and managing leachate recirculation are key factors in mitigating Cl- pollution from landfill sites.
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