Enhanced dewaterability of sewage sludge in the presence of Fe(II)-activated persulfate oxidation.
Enhanced dewaterability of sewage sludge in the presence of Fe(II)-activated persulfate oxidation.
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DOI：
10.1016/j.biortech.2012.01.170
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发表时间：
2012-07
影响因子：
11.4
通讯作者：
Guangyin Zhen;Xueqin Lu;Youcai Zhao;Xiaoli Chai;Dong-jie Niu
中科院分区：
文献类型：
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作者：
Guangyin Zhen;Xueqin Lu;Youcai Zhao;Xiaoli Chai;Dong-jie Niu
研究了Fe(II)活化过硫酸盐氧化对污泥脱水的潜在效益及其机理。采用毛细抽吸时间(CST)评价污泥的脱水性能。同时测定了胞外聚合物(EPS)和粘度，试图解释观察到的污泥脱水能力的变化。最佳脱水条件为过硫酸盐(S2O82-)1.2 mmol/gVSS，Fe(II)1.5 mmol/gVSS，pH 3.0~8.5，具有很高的CST还原效率(1min内降解率为88.8%)。进一步观察到，可溶性EPS和粘度对污泥脱水的影响相对较小，而污泥的脱水能力与结合EPS之间没有相关性。三维激发-发射矩阵(EEM)荧光光谱还表明，过硫酸盐氧化降解了污泥中的可溶性EPS，使污泥絮体破裂，导致胞内水分释放，从而提高了污泥的脱水性能。
The potential benefits of Fe(II)-activated persulfate oxidation on sludge dewatering and its mechanisms were investigated in this study. Capillary suction time (CST) was used to evaluate sludge dewaterability. Both extracellular polymeric substances (EPS) and viscosity were determined in an attempt to explain the observed changes in sludge dewaterability. The optimal conditions to give preferable dewaterability characteristics were found to be persulfate (S2O82-) 1.2mmol/gVSS, Fe(II) 1.5mmol/gVSS, and pH 3.0–8.5, which demonstrated a very high CST reduction efficiency (88.8% reduction within 1min). It was further observed that both soluble EPS and viscosity played relatively negative roles in sludge dewatering, whereas no correlation was established between sludge dewaterability and bound EPS. Three-dimensional excitation–emission matrix (EEM) fluorescence spectra also revealed that soluble EPS of sludge were degraded and sludge flocs were ruptured by persulfate oxidation, which caused the release of water in the intracellular pace and subsequent improvement of its dewaterability.