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Chemical oxygen demand
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==Government regulation== Many governments impose strict regulations regarding the maximum chemical oxygen demand allowed in wastewater before it can be returned to the environment. For example, in [[Switzerland]], a maximum oxygen demand between 200 and 1000 mg/L must be reached before wastewater or [[industrial water]] can be returned to the environment [https://web.archive.org/web/20040310122559/http://www.csem.ch/corporate/Report2002/pdf/p56.pdf].
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