发明名称 |
Verbesserte Beseitigung von Phosphaten in der Abwasserbehandlung mit Belebtschlammverfahren. |
摘要 |
<p>There is disclosed an activated sludge wastewater treatment process which comprises aerating a mixed liquor comprising phosphate-containing influent wastewater and activated sludge in an aeration or high-purity oxygen zone to reduce the BOD/COD content of the wastewater and to cause the microorganisms present to take up phosphate. A phosphate-enriched sludge in which the phosphorus is present primarily in the sludge solids is separated from the mixed liquor to provide a substantially phosphate-free effluent. At least a portion of said phosphate-enriched sludge is passed to a phosphate pre-stripping zone, either in a separate tank or within the phosphate stripper tank itself, where BOD/COD-containing water, or feedwater, containing at least 50 mg/L of BOD, is added to poise the sludge organisms to begin enhanced rapid release of dissolved phosphate by pre-stripping it from the sludge or poising the sludge for rapid, enhanced release of phosphate. Thence, the sludge is passed to a phosphate stripping zone. In the phosphate stripping zone, the sludge settles to form a supernatant liquor in the stripping zone upper section and settled sludge in the stripping zone lower section. The settled sludge is maintained under anaerobic conditions for a time sufficient to complete the release of the desired amount of phosphate from the sludge solids to the liquid phase of said settled sludge. At least a portion of the anaerobic sludge from the phosphate stripping zone is recycled to the aeration or high-purity oxygen zone as activated sludge. The phosphate-rich supernatant from the phosphate stripping zone may be applied directly to land, or treated with a chemical precipitating agent to precipitate the phosphate therefrom and the precipitated phosphate may then be removed through the use of a reactor/clarifier, primary or secondary clarifier or other tankage, thus preparing the phosphate for final disposal directly or as fresh, digested or otherwise treated sludge.</p> |
申请公布号 |
DE69004507(T2) |
申请公布日期 |
1994.05.11 |
申请号 |
DE1990604507T |
申请日期 |
1990.06.01 |
申请人 |
BIOSPHERICS INC., BELTSVILLE, MD., US |
发明人 |
LEVIN, GILBERT V., ANNAPOLIS, MARYLAND 21403, US;WRIGHT, RONALD R., PARKVILLE, MARYLAND 21234, US |
分类号 |
C02F1/58;C02F3/12;C02F3/30;(IPC1-7):C02F3/12 |
主分类号 |
C02F1/58 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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