硫酸根自由基预处理剩余污泥产酸效能与机理

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摘要

为了优化最适宜的预处理条件，探究了不同高铁酸钾（PF）亚硫酸钠（Na₂SO₃）投加量对污泥EPS剥离和有机物转化短链脂肪酸（SCFAs）的贡献情况.结果表明，Fe（VI）/S（IV）联合预处理对污泥结构，尤其是紧密附着层EPS有较强的分解作用.当PF/Na₂SO₃的物质的量比从0/1（单独Na₂SO₃组）增加至2/3时，SCFAs的最高产量由1169.5mg COD/L增加到4796.9mg COD/L（第4d），是单独Na₂SO₃和PF实验组的4.5和1.6倍.同时，当PF/Na₂SO₃物质的量比为2/3时，溶解性糖类和蛋白质释放量达到最大值，分别为260.1和2212.2mg COD/L.因此，适宜剩余污泥发酵产酸的最佳PF/Na₂SO₃物质的量比为2：3.基于本研究结果，结合传统厌氧发酵各个阶段，阐明了Fe（VI）/S（IV）强化污泥产酸的机理，为采用基于SO₄^·-的高级氧化方法强化污泥发酵产酸技术的应用提供了理论基础.

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	刘红燕
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	樊雅欣
	魏瑶丽
	岳秀萍

关键词 ：硫酸根自由基, 剩余污泥, 短链脂肪酸, 厌氧发酵

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

收稿日期: 2019-09-30

PACS:

X703.5

基金资助:

国家自然科学基金青年基金资助项目（51608345）；国家博士后科学基金资助项目（2017T100170）；山西省研究生创新项目（2019BY041）

通讯作者: 周爱娟,副教授,zhouaijuan@tyut.edu.cn E-mail: zhouaijuan@tyut.edu.cn

作者简介: 刘红燕(1994-),女,山东聊城人,硕士研究生,主要从事废弃生物质资源化处理及产能研究.

引用本文:

刘红燕, 周爱娟, 刘芝宏, 樊雅欣, 魏瑶丽, 岳秀萍. 硫酸根自由基预处理剩余污泥产酸效能与机理[J]. 中国环境科学, 2020, 40(4): 1594-1600. LIU Hong-yan, ZHOU Ai-juan, LIU Zhi-hong, FAN Ya-xin, WEI Yao-li, YUE Xiu-ping. Performance and mechanism of short-chain fatty acids productionfrom waste activated sludgefermentationelevating by sulfate radical pretreatment. CHINA ENVIRONMENTAL SCIENCECE, 2020, 40(4): 1594-1600.

链接本文:

http://www.zghjkx.com.cn/CN/ 或 http://www.zghjkx.com.cn/CN/Y2020/V40/I4/1594

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