CaO<sub>2</sub>投加量及投加方式对剩余污泥厌氧发酵产生短链脂肪酸的影响

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摘要以污水处理厂剩余活性污泥作为研究对象，在中温条件下，按照不同投加量和投加方式投加过氧化钙（CaO₂）进行预处理，考察其对污泥发酵产酸和产甲烷的影响，以期确定CaO₂最佳投加量和投加方式.结果表明，在（35±1）℃条件下，投加CaO₂可提高剩余污泥发酵液pH值，从而促进有机物的快速溶出.在同样投加剂量条件下，一次性投加比多次投加更有利于污泥的溶解以及短链脂肪酸的积累.当一次性投加0.2g CaO₂/g VSS时，发酵液中乙酸浓度在第7d达到最高值（169mg COD/g VSS），同时乙酸在6种主要酸中所占比例达到最大（71.0%）.与一次性投加方式相比较，多次投加CaO₂对产甲烷的抑制作用较小，不利于SCFAs的积累.

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	桂肖山
	徐闯
	王泽茜
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	李咏梅

关键词 ：过氧化钙, 剩余污泥, 厌氧发酵, 投加量, 投加方式

Abstract：CaO₂ was added under mesophilic conditions for the pretreatment of waste activated sludge (WAS) obtained from wastewater treatment plants (WWTP). The effects of CaO₂ dosage and dosing methods on the acidification and methane production during anaerobic fermentation were evaluated. The aim was to find the optimum dosage and dosing method of CaO₂ for obtaining short chain fatty acids (SCFAs) from WAS. The results indicated that at (35±1)℃, CaO₂ addition could remarkably increase pH of the supernatant, thus accelerating the release of organic matters. Given the constant dosage, the once-and-for-all dosing of CaO₂ could enhance the solubilization of WAS and the accumulation of SCFAs much more effectively than multiple dosing of CaO₂. When CaO₂ was dosed at 0.2g/g VSS for once, the acetic acid concentration witnessed its highest level (169mg COD/g VSS) on day 7 and accounted for 71.0% of the total SCFAs, eclipsing all the other acids. Compared with the once-and-for-all dosing method, multiple dosing of CaO₂ resulted in less accumulation of SCFA due to weaker inhibition of methane production.

Key words： CaO₂ waste activated sludge anaerobic fermentation dosage dosing methods

收稿日期: 2017-10-09

X703

基金资助:国家自然科学基金资助项目（51578392）；2015年国家大学生创新项目（0400107139）

通讯作者: 李咏梅,教授,liyongmei@tongji.edu.cn E-mail: liyongmei@tongji.edu.cn

作者简介: 桂肖山(1997-),男,安徽芜湖人,同济大学环境科学与工程学院环境工程系本科学生,主要从事污水处理与资源化研究.

引用本文:

桂肖山, 徐闯, 王泽茜, 平倩, 李咏梅. CaO₂投加量及投加方式对剩余污泥厌氧发酵产生短链脂肪酸的影响[J]. 中国环境科学, 2018, 38(5): 1785-1791. GUI Xiao-shan, XU Chuang, WANG Ze-qian, PING Qian, LI Yong-mei. Effects of the dosage and dosing methods of CaO₂ on the production of short-chain fatty acids produced during anaerobic fermentation of waste activated sludge. CHINA ENVIRONMENTAL SCIENCECE, 2018, 38(5): 1785-1791.

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http://www.zghjkx.com.cn/CN/ 或 http://www.zghjkx.com.cn/CN/Y2018/V38/I5/1785

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