The State Key Laboratory of Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Tongji University, Shanghai 200092, PR China.
Bioresour Technol. 2012 Sep;119:7-14. doi: 10.1016/j.biortech.2012.05.115. Epub 2012 Jun 1.
The potential of Fe(II)-activated persulfate (S(2)O(8)(2-)) oxidation on enhancing the dewaterability of sludge flocs from 3-full scale wastewater treatment plants (WWTPs) were investigated. Normalized capillary suction time (CST) was applied to evaluate sludge dewaterability. Both extracellular polymeric substances (EPS) and metabolic activity of microorganisms were determined to explore the responsible mechanism. Fe(II)-S(2)O(8)(2-) oxidation effectively improved sludge dewaterability. The most important mechanisms were proposed to be the degradation of EPS incorporated in sludge flocs and rupture of microbial cells. Three-dimensional excitation-emission matrix (EEM) fluorescence spectroscopy confirmed that the powerful SO(4)(-) from Fe(II)-S(2)O(8)(2-) system destroyed the particular functional groups of fluorescing substances (i.e., aromatic protein-, tryptophan protein-, humic- and fulvic-like substances) in EPS and caused cleavage of linkages in the polymeric backbone and simultaneous destruction of microbial cells, resulting in the release of EPS-bound water, intracellular materials and water of hydration inside cells, and subsequent enhancement of dewaterability.
采用亚铁激活过硫酸盐（S(2)O(8)(2-)）氧化作用来增强 3 座实际规模污水处理厂（WWTP）剩余污泥絮体脱水性的潜力。采用归一化毛细吸水时间（CST）来评价污泥的脱水性能。通过测定胞外聚合物（EPS）和微生物代谢活性来探讨其作用机制。亚铁-过硫酸盐氧化作用可有效改善污泥的脱水性能。提出的最重要的机制是污泥絮体中 EPS 的降解和微生物细胞的破裂。三维激发-发射矩阵（EEM）荧光光谱证实，Fe(II)-S(2)O(8)(2-)体系中产生的强 SO(4)(-)可破坏 EPS 中荧光物质（即芳香族蛋白、色氨酸蛋白、腐殖质和富里酸类物质）的特殊功能基团，并导致聚合物主链中键的断裂以及微生物细胞的同时破坏，从而释放出与 EPS 结合的水、细胞内物质和细胞内水合水，进而增强脱水性。
