Abstract
Aerobic biological treatment is the most common practice removing organic carbon and nitrogen compounds from landfill leachate. After some years of landfill operation when the landfill is in the methanogenic stage, the landfill body itself works as an anaerobic reactor, but in general leachate treatment will be necessary. Aerated lagoons are an economic solution to remove organic carbon and convert ammonium to nitrate, but they need long detention times. Rotating biological contactors can be effectively used for chemical oxygen demand removal and nitrification in organically low concentrated leachate. Only with activated sludge plants it is possible to eliminate also high concentrated organic carbon concentrations as well as to nitrify and denitrify. As a special activated sludge concept, sequencing batch reactor is in operation. The biological processes and their implementation to the different biological processes are described, and parameters for process designing are given. The possibility of leachate cotreatment in domestic sewage plants is discussed.
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