| 摘要 |
<p>PURPOSE:To rationalize a high degree treatment of an effluent from a biological disposal process and to extremely reduce COD and color components, by biologically treating organic waste water without being diluted, and then oxidizing excess sludge together with the effluent. CONSTITUTION:Untreated night soil 1, without being diluted, flows into a biological disposer 2. Active sludge in the disposer 2 is maintained by a concentrator 3. An effluent slurry 6 containing excess sludge flows into a disposal vessel 7, where ferrous sulfate and an oxidizing agent 11 are added to the slurry. Slurry from the vessel 7 is separated into dewatered cake 9 and separated water 10 by a dehydrator 8. The separated water 10 is introduced into another disposal vessel 13, where the water is adjusted at pH 2-4 by a reagent 12 and agitated. An effluent from the vessel 13 is neutralized by an alkali 15 and treated by a solid-liquid separator 17 to separate precipites 16. Thus, purified water 18 is obtained. A mineral acid is added to the precipitates 16, and the precipitates are reused in the disposal vessel 7 or 13.</p> |
