Method for sludge dewatering using kitchen waste to synergistically enhance anaerobic biological acidification and low-temperature thermal hydrolysis of excess sludge

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United States of America Patent

PATENT NO 12006271
APP PUB NO 20210323888A1
SERIAL NO

17153904

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A method for sludge dewatering using kitchen waste to synergistically enhance a coupling of an anaerobic biological acidification and a low-temperature hydrothermal of excess sludge is disclosed. The method includes the following steps: first, uniformly mixing the excess sludge from a sewage treatment plant and the kitchen waste for an anaerobic biological acidification reaction at 36.5-37.5° C. for 2-4 days; then, concentrating the acidified mixture by centrifugation at a speed of 3000-5000 rpm for 5-10 min; performing a low-temperature thermal hydrolysis treatment on a residue obtained after removing a supernatant for 15-30 min at 100-140° C.; and after the thermal hydrolysis treatment is finished, cooling and dewatering to obtain a dewatered sludge cake and a dewatered filtrate. The new method realizes high-efficiency sludge dewatering and innocuous utilization of dewatered filtrate and sludge cake without adding chemical reagents and effectively avoids generating hardly-degradable chemical oxygen demand.

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Patent OwnerAddress
TONGJI UNIVERSITY200092 SIPING ROAD 1239 SHANGHAI YANGPU DISTRICT SHANGHAI CITY SHANGHAI CITY 200092

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Chen, Renjie Shanghai, CN 17 57
Chen, Sisi Shanghai, CN 17 5
Dong, Bin Shanghai, CN 77 544
Gao, Jun Shanghai, CN 229 941
Sun, Xiangjuan Shanghai, CN 1 0
Xue, Bing Shanghai, CN 19 87
Yang, Zao Shanghai, CN 2 8

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