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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摘要以在污水处理过程中采用化学强化除磷而产生的剩余污泥为研究对象，考察了硫化钠（Na₂S）投加量对污泥释磷以及厌氧发酵的影响.结果表明，在S/Fe物质的量比为0.3~1的范围内，投加的Na₂S越多，污泥厌氧释放的磷越多，当S/Fe物质的量比为1：1时，污泥S1和S2上清液中磷浓度分别达到了170和150mg/L（污泥释磷率分别为22.2%和27.23%）；投加Na₂S会导致pH值升高，碱性条件会促进有机物的释放以及产酸微生物的生长，并因此促进VFAs的产生；VSS/TSS越高的污泥，对pH值的缓冲能力越强，释放的NH₄⁺-N也越多；此外，投加Na₂S后会导致污泥上清液中Fe（Fe²⁺与Fe³⁺之和）和Al³⁺的浓度上升，而生成的FeS_x会使沉淀沉降性能变差.S/Fe物质的量比为0.3和0.5时，对生物多样性影响不大，但大于1：1后Shannon指数下降.综合考虑释磷与后续厌氧发酵以及污泥沉降性能，推荐按S/Fe物质的量比为0.3：1~0.5：1投加Na₂S，既可以保证上清液磷浓度大于50mg/L，又将上清液中Fe和Al³⁺等杂质金属离子的浓度控制在较低的水平（<10mg/L），利于后续用鸟粪石法回收磷，同时促进产酸（VFAs为对照组的8.3倍），且污泥沉降性能受影响较小.

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	张强
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关键词 ：化学强化除磷污泥, 厌氧发酵, 释磷, Na₂S

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

收稿日期: 2020-07-06

PACS:

X703

基金资助:水体污染控制与治理科技重大专项（2015ZX07306001）；上海市科委国际合作项目（18230712100）

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

作者简介: 张强(1996-),男,河南信阳人,同济大学硕士研究生,主要从事污水处理与资源化研究.发表论文1篇.

引用本文:

张强, 李咏梅. 投加Na₂S对化学强化除磷污泥厌氧发酵释磷的影响[J]. 中国环境科学, 2021, 41(3): 1219-1227. 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. CHINA ENVIRONMENTAL SCIENCECE, 2021, 41(3): 1219-1227.

链接本文:

http://www.zghjkx.com.cn/CN/ 或 http://www.zghjkx.com.cn/CN/Y2021/V41/I3/1219

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