二价铁活化过硫酸盐破解污泥及脱水效果研究
Study on the Effect of Ferrous Iron Activated Persulfate Cracking Sludge and Dewatering
殷凤双 1王梓萌 1汪碧涵 1薛骏 2谢雨伶 1周长风 1刘翠云1
作者信息
- 1. 南京工业大学 城市建设学院,江苏南京 211816
- 2. 南京工业大学 城市建设学院,江苏南京 211816;西华大学 建筑与土木工程学院,四川 成都 610039
- 折叠
摘要
针对城镇污水处理厂污泥有机质含量高、脱水困难的现状,该研究采用二价铁(Fe2+)活化过硫酸钾调理污泥来提高污泥的脱水效果,研究了 Fe2+投加量、过硫酸钾/Fe2+摩尔比、pH、搅拌速度和反应时间对污泥脱水性能的影响,并探索了 Fe2+活化过硫酸钾破解污泥的机理.研究结果表明:Fe2+活化过硫酸钾可明显改善污泥脱水性能,脱水后污泥的含水率由调理前的87.32％降至调理后的80％左右;上述考察因素对污泥脱水效果均有一定影响,尤其是Fe2+投加量为60mg/gDS,采用过硫酸钾/Fe2+摩尔比为1.4,pH为中性或酸性范围时,活化和破解的效果最好,脱水后污泥含水率为76％～78％;调理后污泥胞外聚合物(EPS)中多糖和蛋白质含量的分析表明,Fe2+活化过硫酸钾产生的SO4-·使部分紧密型EPS(TB-EPS)转化为松散型EPS(LB-EPS)和溶解型EPS(SL-EPS),促进了结合水的释放,有利于污泥脱水.
Abstract
Aiming at the issues of high organic matter content and difficult dewatering of sludge in urban sewage treatment plants,ferrous iron(Fe2+)activated potassium persulfate conditioned sludge was used to improve the dewa-tering effect of sludge in this study.The effects of Fe2+dosage,molar ratio of potassium persulfate/Fe2+,pH,stirring speed and reaction time on sludge dewatering were studied,and the mechanism of Fe2+activated potassium persul-fate cracking sludge was explored.The results showed that Fe2+activated potassium persulfate could significantly im-prove the sludge dewatering.After dewatering,the moisture content of sludge could decrease from 87.32％to about 80％before and after conditioning;The above factors had a certain influence on the sludge dewatering effect.Espe-cially when the Fe2+dosage was 60 mg/g DS,the molar ratio of potassium persulfate/Fe2+was 1.4,and the pH was in the neutral or acidic range,the activation and cracking effect was the best.And the moisture content of the sludge after dewatering was about 76％～78％;The analysis of polysaccharide and protein content in extracellular poly-meric substances(EPS)showed that the S04-·activated by Fe2+activated potassium persulfate converted part of tightly bound EPS(TB-EPS)into loosely bound EPS(LB-EPS)and soluble EPS(SL-EPS),which promoted the release of bound water and was conducive to sludge dewatering.
关键词
Fe2+活化/过硫酸盐/破解污泥/脱水效果/胞外聚合物Key words
Fe2+activation/persulfate/crack the sludge/dewatering effect/extracellular polymeric substances引用本文复制引用
出版年
2024
国家科技期刊平台
NSTL
万方数据