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 pollutants are in leachate?
Heavy metals including arsenic, chromium, cadmium, cobalt, mercury, lead, nickel and zinc are found in landfill leachate at varying concentrations.
What toxic chemical is produced by landfill?
Leachate is the liquid formed when waste breaks down in the landfill and water filters through that waste. This liquid is highly toxic and can pollute the land, ground water and water ways.
What chemicals are used in landfills?
Landfill gas contains many different gases. Methane and carbon dioxide make up 90 to 98% of landfill gas. The remaining 2 to 10% includes nitrogen, oxygen, ammonia, sulfides, hydrogen and various other gases. Landfill gases are produced when bacteria break down organic waste.
What makes leachate toxic?
When landfill waste degrades and rain rinses the resulting products out, leachate is formed. The black liquid contains organic and inorganic chemicals, heavy metals as well as pathogens; it can pollute the groundwater and therefore represents a health risk.
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 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.
How do you remove leachate from the landfill?
There are many methods of leachate treatment  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 can be produced from landfill waste?
How is landfill gas produced?
|Table 2-1: Typical Landfill Gas Components|
|Component||Percent by Volume|
What is leachate collection?
Leachate collection systems consist of a series of perforated pipes, with the primary purpose of leading the leachate to sumps so it can be extracted from solid waste landfills. This prevents accumulation of the leachate on the liner system, thus minimizing leachate migration to the environment.
How toxic are landfills?
Scientists Ranked The Most Dangerous And Toxic Pollutants in US Landfills. The United States is home to nearly 2,000 active landfills. Each day, these enormous piles of garbage can leach well over 2 million liters of liquid per site into the soil, contaminating local water with potentially toxic substances.
How does leachate contribute to groundwater pollution?
Landfill Cross Section
The leachate from Municipal Solid waste landfills is a highly concentrated “chemical soup”, so concentrated that small amounts of leachate can pollute large amounts of groundwater, leaving it unsuitable for domestic water use.
Is landfill gas toxic?
Quality of Landfill Gas
Landfill gas (LFG) is by definition the gas that is produced under anaerobic conditions in a landfill. … LFG contains also a large number of organic and inorganic trace gases. Some of them are extremely toxic. The important trace gases are those containing chlorine, fluorine, sulfur, and silicon.
What is the composition of leachate?
Leachate composition is considered in four categories: (I) dissolved organic matter, (2) inorganic macro components, (3) heavy metals, and (4) xenobiotic organic compounds.
What kind of hazard is leachate?
Fred Lee, Ph. D., P.E., D.E.E. SUMMARY: Municipal solid waste landfill leachate contains a wide variety of hazardous chemicals, conventional contaminants, and non-conventional contaminants.
|Parameter||“Typical” Concentration Range||“Average”*|
|Nickel||0.1 – 1||1.2|
|Iron||10 – 1,000||430|
|Zinc||0.5 – 30||21|
What creates leachate and what does it contain?
Leachate is defined as any contaminated liquid that is generated from water percolating through a solid waste disposal site, accumulating contaminants, and moving into subsurface areas. A second source of leachate arises from the high moisture content of certain disposed wastes.