What is recirculation of leachate?
What is recirculation of leachate?
Leachate recirculation is defined in Environment Agency guidance LFTGN03 as: ‘the practice of returning leachate to the landfill from which it has been abstracted’ (Environment Agency 2004). Within the context of this DSS, the definition has been expanded to include the introduction of any liquids into a landfill.
How do you manage leachate in landfills?
Leachate can be treated by biological processes, such as activated sludge. Physicochemical processes are used to remove metals, ammonia, and dissolved solids, among other parameters. Membrane separation is an effective method for clarifying mixed liquor produced during biological treatment.
What happens to landfill leachate?
In older landfills and those with no membrane between the waste and the underlying geology, leachate is free to leave the waste and flow directly into the groundwater.
What is leachate and how is it controlled in a landfill?
Leachate is liquid generated from rainfall and the natural decomposition of waste that is filtered through the landfill to a leachate collection system. The leachate collection system’s job is to direct the leachate to collection sumps so it can be properly removed from the landfill.
What are leachates in a landfill?
Leachate – formed when rain water filters through wastes placed in a landfill. When this liquid comes in contact with buried wastes, it leaches, or draws out, chemicals or constituents from those wastes.
Why is it important to monitor leachate and methane?
Monitoring landfill leachate, groundwater and surface water The reasons for monitoring leachate, groundwater and surface water at landfills are to: provide reassurance that leachate controls are preventing pollution of the environment (by reference to a pre-established baseline)
How is leachate produced?
Leachate is produced when moisture enters the refuse in a landfill, extracts contaminants into the liquid phase, and produces a moisture content sufficiently high to initiate liquid flow.
How do you dispose of leachate?
What are the options for handling leachate from landfill sites? The options available include off-site disposal, discharge to sewers with or, possibly, without pre-treatment, or treatment on-site for environmental disposal or re-use.
What is landfill gas leachate?
Landfill leachate is formed when rainwater infiltrates and percolates through the degrading waste, while landfill gas is a microbial degradation byproduct under anaerobic conditions.
How is leachate formed in landfills?
Leachate? “The liquid formed when rain water filters through wastes placed in a landfill. When this liquid comes in contact with buried wastes, it leaches, or draws out, chemicals or constituents from those wastes”.
What does landfill leachate contain?
Generally leachate has a high biochemical oxygen demand (BOD) and high concentrations of organic carbon, nitrogen, chloride, iron, manganese, and phenols. Many other chemicals may be present, including pesticides, solvents, and heavy metals. The direction of groundwater flow.
How leachate and gas are generated in a landfill?
Landfill leachate is produced when rainwater and seepage water percolate through the top cover, make contact with the buried unprocessed solid waste and extract soluble components.