| 摘要 |
Separating domestic waste water for aerobic filtration of black water and subsequently combining the filtration with grey water provides a convenient source of carbon and anaerobic matter for biological dentrification of nitrates in a filtration system of anaerobic atmosphere achieved biologically through normal decomposition. Improved filter means for the black water includes alternating layers of stone and sand, the latter being well ventilated to maintain at least slight acidity (pH=4).
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