Study on the Effect of Ferrous Iron Activated Persulfate Cracking Sludge and Dewatering
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.
Fe2+activationpersulfatecrack the sludgedewatering effectextracellular polymeric substances
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