Biological wastewater treatment
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Biological wastewater treatment is a group of methods to free water from biological and chemical pollution.
The active littoral zone
The littoral zone of a lake is the shallow part, where water plants and a great variety of small animals and microbes are living. It is biological active, that is, it has a cleaning effect upon the water. Even pharmaceutic substances are digested. However, the cleaning capacity is limited.
Such a lake can be an important part of the waste water treatment in a Martian settlement.
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