LIUZi-juan,WANG Yin-yi,XUXiao-tian,et al.Acid Production and Dewatering Performance of Excess Sludge with Alkaline Fermentation[J].China Water & Wastewater,2022,38(No.3):92-98.
Acid Production and Dewatering Performance of Excess Sludge with Alkaline Fermentation
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第38卷
Number:
No.第3
Page:
92-98
Column:
Date of publication:
2022-02-01
- Keywords:
- excess sludge; acid produced by fermentation; dewatering performance; flocculant; volatile organic acids
- Abstract:
- Excess sludge from a sewage treatment plant in South China was fermented under alkaline condition to solve the problem of insufficient carbon source in sewage treatment plants. The acid production, ammonia nitrogen and total phosphorus release were systematically investigated, and the utilization of fermentation broth by microorganisms and sludge dewatering performance were explored. When pH and temperature were 10 and 25 ℃, the volatile organic acids content reached the peak of 3 262 mg/L on the 7th day of fermentation, among which the accumulation of acetic acid accounted for 76.52%. The processes of microbial denitrification, nitrification and anaerobic phosphorus release were not affected by using fermentation broth as raw material. When pH and PFS dosage of dry base were 4 and 70 kg/t, the water content of fermented sludge could be reduced to 64.02%. A large number of fatty acids were produced after alkaline fermentation of sludge, and the organic components in the fermentation broth could be used as the denitrifying carbon source required by microorganisms, which had no significant adverse effect on the nitrification process and phosphorus release. In addition, the sludge produced by fermentation had a good dewatering performance after PFS conditioning.
Last Update:
2022-02-01