Method for decreasing sewage sludge from town and changing it to resources
Title：
Method for decreasing sewage sludge from town and changing it to resources
Application Number：
 200610112790
Application Date：
 2006/09/01
Announcement Date：
 2007/02/21
Pub. Date：
Publication Number：
 1915868
Announcement Number：
Grant Date：
Granted Pub. Date：
ApplicationType：
 Invention
State/Country：
 11[China|beijing]
IPC：
 C02F 11/00, C02F 11/02, C02F 11/04
Applicant(s)：
 Tsinghua Univ.
Inventor(s)：
 Nie Yongfeng, Wang Zhiyu, Jin Yiying
Key Words：
 sewage sludge, decreasing, resources
Abstract：
 This invention discloses a method for treating sludge in city wastewater. The method comprises: (1) pulverizing sludge by ultrasonication so that large quantities of organic matters enter into the liquid; (2) treating the sludge by anaerobic/aerobic biodigestion to obtain organic macromolecular matters; (3) treating by anaerobic biodigestion to convert the majority of the organic matters into methane for utilization; (4) purifying the small molecular organic matters by aerobic biodigestion to obtain humic acid in the supernatant; (5) separating and recovering humic acid by membrane separation technique so that the output water satisfies state wastewater discharge standards. The obtained humic acid can be used as an organic liquid fertilizer. The method can be used to treat primary-precipitation sludge, residual active sludge, humic acid sludge and mixed sludge produced by city wastewater treatment plants. The obtained organic liquid fertilizer is safe and reliable.
Claim：
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PCT：
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2008-4-17
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