硫酸根自由基预处理剩余污泥产酸效能与机理

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Abstract

In order to optimize the pretreatment conditions, this work investigated the contribution of different dosages of potassium ferrate (PF)/sodium sulfite (Na₂SO₃) on EPS disintegration and SCFAs production. The results showed that the coupling oxidation of Fe(VI)/S(IV) showed promising lysis performance, especially for the tightly-bound EPS. When the molar ratio of PF/Na₂SO₃ increased from 0/1(sole Na₂SO₃) to 2/3, SCFAs concentration increased from 1169.5mg COD/L to 4796.9mg COD/L(at 4d), which was 4.5 fold and 1.6 fold over that obtained in the sole Na₂SO₃ and PF tests. Meanwhile, under this condition, the release of soluble carbohydrates and proteins reached their peaks of 260.1mg COD/L and 2212.2mg COD/L, respectively. Therefore, the optimal molar ratio of PF/Na₂SO₃ for SCFAs production was 2/3. Based on the results obtained in this study, the mechanism of Fe(VI)/S(IV)/oxidation for accelerating SCFAs production from WAS was elucidated, which provided a theoretical basis for the potential implementation of SO₄^·- based advanced oxidation methods on WAS fermentation.

Key words： sulfate radical waste activated sludge short chain fatty acids anaerobic fermentation

Received: 30 September 2019

PACS:

X703.5

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	Articles by authors
	LIU Hong-yan
	ZHOU Ai-juan
	LIU Zhi-hong
	FAN Ya-xin
	WEI Yao-li
	YUE Xiu-ping

Cite this article:

LIU Hong-yan,ZHOU Ai-juan,LIU Zhi-hong等. Performance and mechanism of short-chain fatty acids productionfrom waste activated sludgefermentationelevating by sulfate radical pretreatment[J]. CHINA ENVIRONMENTAL SCIENCECE, 2020, 40(4): 1594-1600.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2020/V40/I4/1594

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