HEMiao-lin,ZHANGYan-ping,LIYi-bing.Enhancement and Mechnism of Electrolysis Coupled Fe2+-activated Persulfate Oxidation for Excess Sludge Dewatering[J].China Water & Wastewater,2023,39(15):15-22.
电解耦合Fe2+活化过硫酸盐强化污泥脱水及其机理
- Title:
- Enhancement and Mechnism of Electrolysis Coupled Fe2+-activated Persulfate Oxidation for Excess Sludge Dewatering
- 关键词:
- 污泥脱水; 电解; 过二硫酸盐; 二价铁; 胞外聚合物（EPS）
- Keywords:
- sludge dewatering; electrolysis; peroxydisulfate; ferrous iron; extracellular polymeric substances (EPS)
- 摘要:
- 采用电解（EC）耦合Fe2+/过二硫酸盐（PDS）预处理剩余污泥，考察了电解时间、电压、PDS投加量和Fe2+∶PDS（物质的量之比）对污泥脱水性能的影响，并通过测定胞外聚合物（EPS）、三维荧光光谱（EEM）和扫描电镜（SEM）观察等探讨其机理。结果表明，EC/Fe2+/PDS可有效提高污泥脱水性能。当电压为25 V、PDS投加量为2 g/L、Fe2+∶PDS=0.4、电解时间为30 min时，毛细吸水时间（CST）降低58.3%，泥饼含水率降为74.2%，上清液的SCOD达到367.8 mg/L。EC/Fe2+/PDS体系可有效促进Fe3+向Fe2+的转化，提高Fe2+和PDS的利用率，减少药剂用量；并且，可有效破解污泥絮体及EPS结构，将紧密结合型EPS（TB-EPS）中的蛋白质、多糖和类腐殖酸等物质降解和转移。相关性分析表明，CST与EPS总量相关性较强，污泥脱水性能最佳时EPS理论值为320 mg/L。
- Abstract:
- Electrolysis (EC) coupled Fe2+/peroxydisulfate (PDS) was employed to pretreat excess sludge. The effects of electrolysis time, voltage, PDS dosage and Fe2+ to PDS molar ratio on sludge dewatering performance were investigated, and the mechanism was analyzed by means such as measuring extracellular polymeric substances (EPS), three-dimensional fluorescence spectrum (EEM) and scanning electron microscopy (SEM). EC/Fe2+/PDS effectively improved the sludge dewatering performance. When the voltage was 25 V, the dosage of PDS was 2 g/L, the Fe2+ to PDS molar ratio was 0.4 and the electrolysis time was 30 min, the capillary suction time (CST) was reduced by 58.3%, the moisture content of sludge cake was decreased to 74.2%, and the SCOD of supernatant reached 367.8 mg/L. The EC/Fe2+/PDS system effectively promoted the conversion of Fe3+ to Fe2+, improved the utilization rate of Fe2+ and PDS, and reduced the dosage of reagent. In addition, it effectively cracked the structure of sludge floc and EPS, and degraded and transferred proteins, polysaccharides and humic acids in tightly bound EPS (TB?EPS). The correlation analysis showed that CST had a strong correlation with total EPS, and the theoretical value of EPS was 320 mg/L when the dewatering performance was the best.
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