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.
剩余污泥堿性發(fā)酵產(chǎn)酸及脫水性能研究
- Title:
- Acid Production and Dewatering Performance of Excess Sludge with Alkaline Fermentation
- 關(guān)鍵詞:
- 剩余污泥; 發(fā)酵產(chǎn)酸; 脫水性能; 絮凝劑; 揮發(fā)性有機(jī)酸
- Keywords:
- excess sludge; acid produced by fermentation; dewatering performance; flocculant; volatile organic acids
摘要:- 針對(duì)污水廠進(jìn)水碳源不足的問題，采用南方某污水廠剩余污泥進(jìn)行堿性發(fā)酵實(shí)驗(yàn)，系統(tǒng)考察了產(chǎn)酸量、氨氮和總磷釋放量，研究微生物對(duì)發(fā)酵液的利用以及污泥脫水情況。結(jié)果表明：在pH值=10、25 ℃條件下，發(fā)酵第7天，揮發(fā)性有機(jī)酸含量達(dá)到峰值3 262 mg/L，其中乙酸積累量占比76.52%。采用發(fā)酵液作為原料，微生物反硝化過程、硝化過程、厭氧釋磷過程均不受影響。在pH值為4的條件下，聚合硫酸鐵投加量（以干基計(jì)）為70 kg/t時(shí)，發(fā)酵污泥含水率可降至64.02%。污泥堿性發(fā)酵后可產(chǎn)生大量脂肪酸，且發(fā)酵液中的有機(jī)物組分能作為微生物需要的反硝化碳源，對(duì)硝化過程、磷的釋放均未產(chǎn)生明顯不利影響，發(fā)酵產(chǎn)生的污泥經(jīng)過聚合硫酸鐵調(diào)理后脫水性能良好。
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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