Efficient reduction of chemical oxygen demand in industrial wastewaters

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Depending on the industry activity and the situation, maximum chemical oxygen demand (COD) levels between 200 and 1000 mgO2/l (ppmO2) must be reached in order to release the wastewaters back into the environment [1]. Wastewater treat-ment technologies, such as filtration, biological digestion, or incineration exist but these technologies are either expensive or generate sludges which must be eliminated in a second step. The technology presented here consists of the reduction of the COD or the increase of the biodegradability of initially nonbiodegradable industrial wastewaters through a highly effi-cient electrochemical treatment.

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