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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

Evaporation Depending 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-circulation Enhances 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 treatment Spray 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 stripping Removes ammonia and /or volatile organics but may cause atmospheric pollution
Adsorption Removes organics and often used at the final stage of treatment.
Evaporation Concentrates contaminants in leachate. Require further treatement.
Reverse osmosis Removes dissolved and suspended matters, heavy metals, and reduces BOD and COD, but the system is costly and requires brine treatment.
Wet air oxidation Suitable for leachate of high organic content but expensive.
Coagulation, filtration & setting Removes solids, heavy metals, turbidity, colour and some organic loading.
Attached growth processes Suitable for high-strength leachate but may require pre-treatment.
Non-attached growth processes Aerobic tretement. Removes organics but requires more space.
Anaerobic treatment Removes organics. Less energy requirement but slow process.