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 Nov;124:29-36. doi: 10.1016/j.biortech.2012.08.039. Epub 2012 Aug 19.
The potential benefits of Fe(II)-activated persulfate (S(2)O(8)(2-)) oxidation under mild temperature in enhancing the dewaterability of waste activated sludge were investigated. Capillary suction time (CST) was used to characterize sludge dewatering. Zeta potential, particle size distribution, three-dimensional excitation-emission matrix (EEM) fluorescence spectroscopy, fourier-transformed infrared (FT-IR) spectroscopy and scanning electronic microscopy (SEM) were employed to explore influencing mechanisms. The results indicated that the dewaterability was deteriorated with single thermal treatment, but significantly enhanced in the presence of Fe(II)-S(2)O(8)(2-) oxidation and further advanced together with thermal treatment. EEM and FT-IR analysis indicated that combined thermal and Fe(II)-S(2)O(8)(2-) oxidation pretreatment led to degrading of tyrosine and tryptophan protein-like substances in extracellular polymeric substances (EPS) and cleavage of linkages in polymeric backbone. SEM images further revealed the rupture of sludge flocs at the colloidal scale, which contributed to the release of EPS-bound water and interstitial water trapped between flocs, and subsequent enhanced dewaterability.
研究了在温和温度下 Fe(II)激活过硫酸盐（S(2)O(8)(2-))氧化对增强废活性污泥脱水能力的潜在益处。采用毛细吸留时间（CST）来表征污泥脱水性能。采用zeta 电位、颗粒大小分布、三维激发-发射矩阵（EEM）荧光光谱、傅里叶变换红外（FT-IR）光谱和扫描电子显微镜（SEM）来探究影响机制。结果表明，单独进行热处理会使脱水性能恶化，但在存在 Fe(II)-S(2)O(8)(2-)氧化的情况下，脱水性能显著增强，并且随着热处理的进行而进一步提高。EEM 和 FT-IR 分析表明，联合热和 Fe(II)-S(2)O(8)(2-)氧化预处理导致细胞外聚合物（EPS）中酪氨酸和色氨酸蛋白样物质的降解以及聚合物主链中键的断裂。SEM 图像进一步揭示了污泥絮体在胶体尺度上的破裂，这有助于释放 EPS 结合水和絮体之间截留的间隙水，从而增强后续的脱水能力。
