pH值调控柠檬酸污泥厌氧发酵产酸及碳源潜力研究

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Abstract The research of acid production by anaerobic fermentation with different pH control conditions was carried out for the treatment of waste activated sludge from citric acid wastewater, using anaerobic granular sludge of citric acid wastewater as inoculum. The mechanism of anaerobic acid production of citric acid sludge was evaluated by the analysis of volatile fatty acids (VFAs), organic matter, nitrogen and phosphorus contents and sludge dewatering performance. The results showed that the alkaline conditions with pH³10 were more conducive to the dissolution of organic matter to promote the production of VFAs. It was obvious that humic acid (HA) and fulvic acid (FA) at constant pH conditions would be dissolved in large quantities with Three-dimensional Excitation-Emission-Matrix Spectra analysis, thus reducing the yield of VFAs. The initial pH=10 was the optimum pH value for anaerobic acid production of citric acid sludge, and the VFAs concentration of (6681.47±126.82) mg COD/L for 4 days was the highest, which was nearly 2 times that of municipal sludge acid production reported in the literature, among which acetic acid was 49.8%. After fermentation, the relative abundances of acid-producing functional bacteria Chloroflexi and Bacteroidota increased from initial 9.52% and 10.87% to 16.84% and 14.39%, respectively. The normalized capillary suction time (n_CST) value of the final sludge was (11.34±0.27) s·L/g with good dewatering performance, and the TP concentration of fermentation broth was (20.45±0.33) mg/L. Studies have shown that the alkaline anaerobic fermentation of citric acid waste activated sludge to produce acid fermentation broth has a good development potential as an exogenous carbon source in the sewage treatment process.

Key words： pH value citric acid waste activated sludge alkaline anaerobic fermentation volatile fatty acids sludge dewatering performance

Received: 06 April 2022

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X705

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	Articles by authors
	SUN Dong-xia
	ZHOU Zi-an
	FENG Zhi-he
	HU Xiu-yu
	QI Guang-xia
	DONG Li-ming

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SUN Dong-xia,ZHOU Zi-an,FENG Zhi-he等. Effect of pH on acid production by anaerobic fermentation of citric acid sludge and carbon source potential of fermentation broth[J]. CHINA ENVIRONMENTAL SCIENCECE, 2022, 42(11): 5198-5207.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2022/V42/I11/5198

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