Method for intensifying biological nitrogen removal and reducing sludge based on anaerobic fermentation of sludge

• Main Authors: HE YUELAN, LI XIYAO, WEI YAN, WANG SHUYING, PENG YONGZHEN
• Format: Patent
• Language: English
• Published: 18.02.2015
• Subjects: CHEMISTRY; CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATERTREATMENT OR WASTE MANAGEMENT; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; METALLURGY; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS; TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINSTCLIMATE CHANGE; TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE

The invention provides a method for intensifying biological nitrogen removal and reducing sludge based on the anaerobic fermentation of the sludge, and belongs to the technical field of the biochemical treatment of sewage and sludge reduction. A device adopted by the method comprises a raw water tank, a water inlet pump, a medicine feeding tank, a medicine feeding pump, a nitrogen removal reactor, an air compressor, a sludge discharge pump, a sludge return pump and a sludge fermentation reactor. The method comprises the steps that through the combined action of nitrifying bacteria and denitrifying bacteria in the nitrogen removal reactor, the removal of nitrogen in the domestic sewage is realized; and then the rest sludge is discharged into a side sealed reactor to carry out the anaerobic fermentation, and sludge anaerobic fermentation liquid of the same volume is returned into the nitrogen removal reactor. The system enables the reduction of the rest sludge to be realized, and at the same time, CH4 generated by the anaerobic fermentation is collected, and the capacity is improved.