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Leachate is the liquid that percolates through solid waste in a landfill and accumulates dissolved and suspended materials from the waste mass. It is a complex and highly contaminated liquid that often contains organic matter, inorganic salts, heavy metals, nitrogen compounds, and toxic substances. If not properly managed, leachate poses serious threats to soil, groundwater, and surface water quality. For this reason, leachate treatment is an essential component of waste disposal management, particularly in sanitary landfills. Over the years, several treatment methods have been developed and applied to minimize the environmental impact of leachate. These treatment approaches can be broadly divided into biological, physico-chemical, and advanced or combined methods. The selection of a suitable treatment technology depends on leachate characteristics such as age, composition, strength of pollutants, and volume, along with economic and site-specific considerations. Biological treatment is one of the most common approaches used to treat leachate with high organic content. Biological processes rely on microorganisms to degrade organic pollutants and convert them into less harmful compounds. There are two broad categories of biological treatment: aerobic and anaerobic. Aerobic treatment methods involve the use of oxygen and aerobic microorganisms to break down organic pollutants. Examples include activated sludge processes, sequencing batch reactors, _______ ______ ________ _________ __________ __________.
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