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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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

Received: 09 October 2017

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	GUI Xiao-shan
	XU Chuang
	WANG Ze-qian
	PING Qian
	LI Yong-mei

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GUI Xiao-shan,XU Chuang,WANG Ze-qian等. 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[J]. CHINA ENVIRONMENTAL SCIENCECE, 2018, 38(5): 1785-1791.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2018/V38/I5/1785

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