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(3):92-98.
剩余污泥碱性发酵产酸及脱水性能研究
- Title:
- Acid Production and Dewatering Performance of Excess Sludge with Alkaline Fermentation
- Keywords:
- excess sludge; acid produced by fermentation; dewatering performance; flocculant; volatile organic acids
- 摘要:
- 针对污水厂进水碳源不足的问题，采用南方某污水厂剩余污泥进行碱性发酵实验，系统考察了产酸量、氨氮和总磷释放量，研究微生物对发酵液的利用以及污泥脱水情况。结果表明：在pH值=10、25 ℃条件下，发酵第7天，挥发性有机酸含量达到峰值3 262 mg/L，其中乙酸积累量占比76.52%。采用发酵液作为原料，微生物反硝化过程、硝化过程、厌氧释磷过程均不受影响。在pH值为4的条件下，聚合硫酸铁投加量（以干基计）为70 kg/t时，发酵污泥含水率可降至64.02%。污泥碱性发酵后可产生大量脂肪酸，且发酵液中的有机物组分能作为微生物需要的反硝化碳源，对硝化过程、磷的释放均未产生明显不利影响，发酵产生的污泥经过聚合硫酸铁调理后脱水性能良好。
- 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.
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