K2FeO4-FeCl3联合强化剩余污泥厌氧消化产酸

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Abstract The excess sludge was reduced by alkaline potassium ferrate (K₂FeO₄)-FeCl₃ pretreatment combined with anaerobic digestion. Under the goal of efficient recovery of organic acid, the effects of different forms of iron sources and iron concentrations on sludge reduction were discussed, and the optimal iron concentration was found. The results showed that alkaline K₂FeO₄ played an important role in the destruction of sludge aggregates during pretreatment. Compared with the blank group, Volatile Suspended Solids (VSS) decreased by 26.79%, median diameter (Dx(50)) decreased by 90%, and sludge settling velocity of 30minutes (SV₃₀) decreased by 33%. The sludge settling performance became better and the sludge reduction effect was obvious. FeCl₃ only had flocculation during pretreatment process. During anaerobic digestion, the acid production of sludge pretreated with alkaline K₂FeO₄ was higher than that of blank group, and the increase of iron ions promoted the rapid production of organic acids. When the dosage of K₂FeO₄ was 20mg Fe/g VSS and FeCl₃ was 21mg Fe/g VSS (that is, TFE dosage of 41mg Fe/g VSS), the sludge showed the maximum volatile organic acids (VFAs) accumulation. On the 3^th of digestion, the VFAs reached 436.1mg COD/g VSS, which was 4.45times that of the blank group. Under this iron concentration, after 15days of digestion, the removal rate of PO₄^3--P reached 69.8%, which was 2.03 times that of only K₂FeO₄ pretreatment. In addition, adding appropriate iron could increase acid-producing bacteria (Actinobacteria phylum and Chloroflexi phylum), which will promote acid production, while the iron dosage was higher than 48mg Fe/g VSS, the activity of main acid-producing bacteria in anaerobic environment would be inhibited.

Key words： K₂FeO₄ FeCl₃ excess sludge anaerobic digestion volatile fatty acids (VFAs)

Received: 18 January 2023

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X705

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	Articles by authors
	TIAN Meng-jia
	LIU Feng
	LI Xiang
	MA Jun
	WANG Jia-en
	ZHAO Wei-dong

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TIAN Meng-jia,LIU Feng,LI Xiang等. Study on enhanced anaerobic digestion of excess sludge with K₂FeO₄ and FeCl₃ for organic acid production[J]. CHINA ENVIRONMENTAL SCIENCECE, 2023, 43(8): 4089-4098.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2023/V43/I8/4089

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