亚铁离子活化过一硫酸盐氧化强化剩余污泥脱水性能。
Enhanced dewaterability of waste activated sludge by Fe(II)-activated peroxymonosulfate oxidation.
机构信息
College of Environmental Science and Engineering, Hunan University, Changsha 410082, PR China; Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha 410082, PR China.
College of Environmental Science and Engineering, Hunan University, Changsha 410082, PR China; Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha 410082, PR China.
出版信息
Bioresour Technol. 2016 Apr;206:134-140. doi: 10.1016/j.biortech.2016.01.088. Epub 2016 Jan 30.
The effect of Fe(II)-activated peroxymonosulfate (Fe(II)-PMS) oxidation on the waste activated sludge (WAS) dewatering and its mechanisms were investigated in this study. The capillary suction time (CST), specific resistance to filterability (SRF) of sludge and water content (WC) of dewatered sludge cake were chosen as the main parameters to evaluate the sludge dewaterability. Experimental results showed that Fe(II)-PMS effectively disintegrated sludge and improved sludge dewaterability. High CST and SRF reduction (90% and 97%) was achieved at the optimal conditions of PMS (HSO5(-)) 0.9 mmol/gVSS, Fe(II) 0.81 mmol/gVSS, and pH 6.8. Extracellular polymeric substances (EPS) and three-dimensional excitation-emission matrix (3D-EEM) fluorescence spectroscopy before and after Fe(II)-PMS oxidation were determined to explain the enhanced dewatering mechanism. The release of EPS-bound water induced by the destruction of EPS was the primary reason for the improvement of sludge dewaterability during Fe(II)-PMS oxidation.
本研究考察了亚铁离子激活过一硫酸盐（Fe(II)-PMS）氧化对剩余活性污泥（WAS）脱水的影响及其机制。选择毛细吸水时间（CST）、污泥过滤比阻（SRF）和脱水污泥饼的含水率（WC）作为主要参数来评估污泥的脱水性能。实验结果表明，Fe(II)-PMS 可有效破坏污泥并改善污泥的脱水性能。在最佳的 PMS（HSO5(-)）0.9 mmol/gVSS、Fe(II) 0.81 mmol/gVSS 和 pH 6.8 条件下，可实现 CST 和 SRF 的高去除率（90%和 97%）。通过测定 Fe(II)-PMS 氧化前后的胞外聚合物（EPS）和三维激发-发射矩阵（3D-EEM）荧光光谱来解释增强的脱水机制。EPS 结合水的释放是由于 EPS 的破坏，这是 Fe(II)-PMS 氧化过程中污泥脱水性能提高的主要原因。
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