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Leachate – Different Treatment Processes For Leachate

Leachate can be treated in different ways. The treatment processes available for leachate are described in brief below.

Leachate Treatment Process

Comment

EvaporationDepending on climate conditions, it may be more suitable for developing countries. Protective measures should be taken to prevent water pollution, particularly during the rainy season.
Re-circulationEnhances waste stabilization process, reduces the hazardous nature of leachate but increases hydraulic loading to the landfill and may increase the rate of groundwater pollution.
Land treatmentSpray irrigation reduces volume leachate significantly due to evapo-transpiration, but may cause atmospheric pollution by volatile organics. Subsurface irrigation increases the cost of the system. Land application may increases salinity of solid and reduce soil phosphate
Air strippingRemoves ammonia and /or volatile organics but may cause atmospheric pollution
AdsorptionRemoves organics and often used at the final stage of treatment.
EvaporationConcentrates contaminants in leachate. Require further treatement.
Reverse osmosisRemoves dissolved and suspended matters, heavy metals, and reduces BOD and COD, but the system is costly and requires brine treatment.
Wet air oxidationSuitable for leachate of high organic content but expensive.
Coagulation, filtration & settingRemoves solids, heavy metals, turbidity, colour and some organic loading.
Attached growth processesSuitable for high-strength leachate but may require pre-treatment.
Non-attached growth processesAerobic tretement. Removes organics but requires more space.
Anaerobic treatmentRemoves organics. Less energy requirement but slow process.