投加硫化钠强化含磷酸铁污泥厌氧释磷的研究

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Abstract

This work aims to study the enhancement of phosphorous (P) release from the waste activated sludge containing ferric phosphate (FePO₄) by adding sodium sulfide (Na₂S). First, effects of Na₂S dosage and temperature on P release from FePO₄ precipitation were investigated. Then, anaerobic fermentation of the sludge containing FePO₄ was studied with different Na₂S dosage, focusing on P release. The results showed that adding more Na₂S could increase P release, and 100% of P can be released from iron phosphate when S/Fe molar ratio was 5:1 or more. Temperature mainly affected the reaction rate. During the anaerobic fermentation of the mixed sludge containing FePO₄, when S/Fe molar ratio was 1:1, 3:1 and 5:1, P release efficiency was 60%, 93% and 100%, respectively; compared to the sludge without Na₂S addition, the efficiency was increased by 26%, 59% and 73%, respectively. In addition, Na₂S addition could promote volatile fatty acids production. When the S/Fe molar ratio was 3:1 and after 7days fermentation, the total VFA concentration was 4.3times of that without Na₂S addition. However, Na₂S addition has negative effect on methane production.

Key words： ferric phosphate mixed sludge phosphorus release sodium sulfide anaerobic fermentation

Received: 05 April 2017

PACS:

X703

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	LU Xiao
	SUN Jing
	LI Yong-mei

Cite this article:

LU Xiao,SUN Jing,LI Yong-mei. Phosphorous release from activated sludge containing ferric phosphate using sodium sulfide[J]. CHINA ENVIRONMENTAL SCIENCECE, 2017, 37(11): 4110-4116.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2017/V37/I11/4110

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