Heavy Metals

Some heavy metals are important trace elements and necessary for bacterial growth because they are components of some enzymes and other proteins. However, municipal and industrial wastewater contain much higher concentrations. Therefore, their concentrations must be limited by law, so that they are not enriched in the food chain of animals.

Concentrations vary greatly in both municipal and industrial effluents. Therefore, it is senseless to publish areas of different values here. We will come back to this point in Section 2.4.2.

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