投加Na<sub>2</sub>S对化学强化除磷污泥厌氧发酵释磷的影响

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Abstract This work aimed to study the phosphorus (P) release from waste activated sludge produced by chemical enhanced P removal in sewage treatment processes. The effects of sodium sulfide dosage on P release and anaerobic fermentation were investigated. The results showed the P release grew with the increase of sodium sulfide dosage in the S/Fe molar ratio range of 0.3~1. When the S/Fe molar ratio was 1:1, phosphate concentrations in the supernatants of sludge S1 and S2 reached 170 and 150mg/L (22.2% and 27.23% of TP were released), respectively. The addition of sodium sulfide led to an increase in pH. And the release of organic matters and the growth of acid-producing microorganisms was promoted by the alkaline conditions, and therefore the production of VFAs was also promoted. The buffering capacity for pH and the NH₄⁺-N release increased with the increase of VSS/TSS. In addition, with the addition of sodium sulfide, concentrations of Fe and Al³⁺ in the supernatant increased, and the settling performance of sludges became worse due to the FeS_x precipitation. While the biodiversity was not obviously influenced at S/Fe molar ratios of 0.3 and 0.5, Shannon index decreased at S/Fe molar ratio of 1:1. Comprehensively considering P release, anaerobic fermentation performance and sludge settleability, S/Fe molar ratio of 0.3~0.5 was recommended. In this S/Fe molar ratio range, the phosphate concentration in the supernatant was higher than 50mg/L, while Fe, Al³⁺ and other metal ions were in a low level (<10mg/L), which was beneficial to P recovery as struvite. In the meantime, volatile fatty acids (VFAs) production was promoted (8.3times higher than the control), and the settleability of sludge was not damaged.

Key words： chemical enhanced phosphorus removal sludge anaerobic fermentation phosphorus release sodium sulfide

Received: 06 July 2020

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X703

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	ZHANG Qiang
	LI Yong-mei

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ZHANG Qiang,LI Yong-mei. Effects of dosing sodium sulfide on phosphorus release during the anaerobic fermentation of waste sludge produced by chemical enhanced phosphorus removal[J]. CHINA ENVIRONMENTAL SCIENCECE, 2021, 41(3): 1219-1227.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2021/V41/I3/1219

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