| 摘要 |
<p>A process for treating wastewater containing biologically oxidisable material comprises the steps of contacting and mixing the wastewater with bacterial active sludge in a well-mixed, unoxygenated contact zone. Then allowing the resultant mixture to separate in a settling zone (13) downstream of the contact zone into a sludge containing biologically oxidisable material adsorbed and absorbed by bacterial material in the bacterial active sludge, and a clarified effluent. The clarified effluent is discharged from the settling zone and the sludge is withdrawn from the settling zone to a stabilising zone (16). The withdrawn sludge is contacted with oxygen-containing gas in the stabilisation zone which allows the adsorbed and absorbed material to be oxidised biologically to form the bacterial active sludge which is passed to the contact zone. <IMAGE></p> |
