The top documents tagged [sewageuntreated raw]

Part 1 SEWAGE. Untreated raw sewage contains organic material ( faeces,food fragments, soap etc) Bacteria feed on this organic waste, breaking it down.

Part 1 SEWAGE. Untreated raw sewage contains organic material ( faeces,food fragments, soap etc) Bacteria feed on this organic waste, breaking it down.

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Biotechnology

Biotechnology

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