| 摘要 |
There is disclosed a process for the purification of sewage containing fatty and albuminous matter. Raw sewage, which is optionally subjected to primary settling in a primary settling tank, is adjusted so that the pH is approximately the same as the isoelectric point of the main components of the proteins present in the sewage. The sewage is then mixed with an aqueous solution of a substituted anionic starch to precipitate the fatty and albuminous matter by flocculation. Following a short dwell time period, the sewage is subjected to an expansion flotation under a dispersion pressure of 4.5-6 bar. The flotation sludge is separated and a clarified effluent is obtained. The flotation sludge is sterilized by treatment with ultraviolet radiation and the clarified effluent is passed to waste.
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