What are landfills and leachate?
In landfills, leachate is a liquid that enters the landfill from external sources such as rainfall, surface drainage, underground springs and groundwater, and from the liquid produced from the putrefaction of waste [14].
Is landfill a wastewater leachate?
Landfills are the final repository for a heterogeneous mixture of liquid and solid waste from residential, industrial, and commercial sources, and thus, have the potential to produce leachate—a liquid waste product that consists of a diverse mixture of chemicals as precipitation or applied water moves through the waste …
How do you remove leachate in landfilling?
There are many methods of leachate treatment [5] such as: Aerobic Biological Treatment such as aerated lagoons and activated sludge. Anaerobic Biological Treatment such as anaerobic lagoons, reactors. Physiochemical treatement such as air stripping, pH adjustment, chemical precipitation, oxidation, and reduction.
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.
What is leachate treatment?
Biological leachate treatment is a proven technology for organics and ammonia removal in young and mature leachate. The anoxic/aerobic processes achieve nitrification and denitrification and reduce the oxygen demand for landfill leachate treatment.
How do you reduce leachate?
How to Reduce Leachate Generation?
- Stormwater management pond location.
- Limit run-on/run-in.
- Grade control to promote runoff.
- Limit size of working face.
- Cover material selection and application.
- Exposed geomembrane.
- Swale liners.
- Limit stormwater retention time on/above the waste.
What is the most important implication of landfill leachate?
The most important implication about landfill leachate from related studies is the need to continuously monitor and manage closed landfills to safely control leachate and prevent contamination of area surrounding the landfill. From this perspective, landfill leachate treatment is a crucial component of landfill management.
What are the pretreatment techniques for landfill leachate removal?
These pretreatment techniques are necessary not only for SS removal but also to remove a portion of the OM and N in order to reduce toxicity for the plants. A number of plant species used for the treatment of tannery wastewaters has also been used to treat landfill leachate.
What is the concentration of Na in landfill leachate?
Typical constituent concentrations in landfill leachate are 1000 mg/L BOD 5, 18,000 mg/L COD, 225 mg/L TN, 30 mg/L TP, 1000 mg/L Ca, 250 mg/L Mg, 500 mg/L Na, 300 mg/L K, 60 mg/L Fe, 500 mg/L Cl −, and 300 mg/L SO 4 2 − (Tchobanoglous and Kreith, 1998).
What determines the concentration of CEC species in leachate?
CEC species and concentration in leachate were influenced by geochemistry, landfill waste composition, precipitation, landfill status (active/closed), leachate treatment process, leachate disposal method, and age of leachate.