化学法调理生化污泥脱水效果研究

石万里; 张大鹏; 赵泽华; 张成; 耿新祥; 马文滢

doi:10.12153/j.issn.1674-991X.20190114

化学法调理生化污泥脱水效果研究

doi: 10.12153/j.issn.1674-991X.20190114

^1. 中国电建集团华东勘测设计研究院有限公司
^2. 生态环境部南京环境科学研究所
^3. 南京师范大学化学与材料科学学院

详细信息

作者简介:
石万里(1990—),男,工程师,硕士,主要从事城镇给排水与污水治理研究,shi_wl@ecidi.com

通讯作者:
马文滢 E-mail: ma_wy@ecidi.com

中图分类号: X703
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出版历程
- 收稿日期: 2019-07-01
- 刊出日期: 2020-03-20

Study on the effect of chemical conditioning method on the dewatering effect of biochemical sludge

^1. POWERCHINA Huadong Engineering Co., Ltd.
^2. Nanjing Institute of Environmental Sciences, Ministry of Ecology and Environment
^3. College of Chemistry and Materials Sciences, Nanjing Normal University

More Information

Corresponding author: Wenying MA E-mail: ma_wy@ecidi.com

摘要

摘要: 针对城市污水处理厂的生化污泥含水量较高不利于后续处理的问题,采用次氯酸钠氧化法、芬顿(Fenton)氧化法及Fenton+氧化钙(CaO)联合法,通过单因素分析法优化工艺条件,对污泥进行脱水处理试验研究。结果表明:在优化工艺条件下,使用次氯酸钠对生化污泥进行氧化后,污泥含水率可由89.90%降至78.44%,产生滤液的质量约为污泥质量的50%;在Fenton氧化体系中,污泥的含水率可由89.90%降至65.32%,产生滤液的质量约为污泥质量的60%;而在使用Fenton+CaO联合法调理后,污泥的含水率可降至51.06%,产生滤液的质量约为污泥质量的56%。在Fenton氧化体系中加入CaO促进了铁离子的水解,氢氧化铁-硫酸钙与过量的硫酸钙结晶析出晶体,构成的刚性骨架在污泥中形成大量透水通道,提高生化污水的脱水性能。综合考虑污泥脱水效果和药剂成本,确定污泥脱水的最佳调理方法为Fenton+CaO联合法。
- 化学调理法 /
- 污泥脱水 /
- 生化污泥 /
- 效果
Abstract: In view of the high water content of biochemical sludge in urban sewage treatment plants, which was not conducive to the following treatment, the sodium hypochlorite oxidation method, Fenton oxidation method and Fenton + calcium oxide combined method were used to dewater the sludge, respectively, combined with single factor analysis to optimize external conditions. The experimental results showed under the optimized conditions, the sludge moisture content could be reduced from 89.90% to 78.44%, and the filtrate quality was about 50% of the initial sludge quality, when sodium hypochlorite was selected as the oxidant. The moisture content of sludge could be reduced to 65.32%, and the filtrate quality increased to 60% in Fenton oxidation system. After combined with calcium oxide, the moisture content of sludge could be further reduced to 51.06%, and the filtrate quality was about 56% of the initial sludge quality. The addition of calcium oxide promoted the hydrolysis of iron ions, and iron hydroxide-calcium sulfate and excess calcium sulfate crystallized. The rigid skeleton constructed could form a large number of water-permeable channels in the sludge, and thus improve the dewatering performance of biochemical sewage. Considering the sludge dewatering effect and chemical cost, Fenton + calcium oxide combined method was found to be the best conditioning method.
- chemical conditioning /
- sludge dewatering /
- biochemical sludge /
- effect

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