Abstract：
Bioleaching and Fenton technology are commonly used preconditioning techniques for sludge dewatering. This study compared the dewatering mechanisms of different conditioning technologies. The results showed that bound water, specific resistance to filtration (SRF), and capillary suction time decreased from 3.95 g/g, 6.16 × 1012 m/kg, and 130.6 s to 3.15 g/g, 2.81 × 1011 m/kg, and 33 s, respectively, under combined treatment condition. Moreover, the free radicals, including ·OH, O2-·and Fe (Ⅳ), further damaged the cell structure, thus increasing the concentration of DNA in the S-EPS layer. This intense degradation sludge particle size decreased by 15.6% and significantly increased zeta potential. Under the combined technology, the α-helix and β-sheet decreased by 42.2% and 56.5%, respectively, destabilizing the spatial structure of proteins and promoting the release of bound water. In addition, the combined technology decreased (Ala/Lys) ratio in the TB-EPS layer by 67.6%, indicating the weakening of protein water-holding capacity. Moreover, the conversion of oxygen-containing compounds to nonpolar hydrocarbons increased the hydrophobicity of the sludge under a combined treatment, thus enhancing dewatering performance.
摘要：
生物浸出和Fenton技术是污泥脱水常用的预处理技术。本研究比较了不同调理技术的脱水机理。结果表明，结合水，比过滤阻力（SRF），毛细管抽吸时间从3.95g/g减少，6.16×1012米/千克,130.6s至3.15g/g，2.81×1011米/千克,33s,分别,在联合治疗条件下。此外，自由基，包括·OH,O2-·和Fe(Ⅳ)，进一步破坏了细胞结构，从而增加S-EPS层中DNA的浓度。这种强烈的降解污泥粒径减少了15.6％，并且显着增加了ζ电位。在组合技术下，α-螺旋和β-折叠下降了42.2%和56.5%，分别,使蛋白质的空间结构不稳定并促进结合水的释放。此外,组合技术使TB-EPS层中的Ala/Lys比率降低了67.6%，表明蛋白质保水能力减弱。此外，含氧化合物转化为非极性烃增加了污泥在联合处理下的疏水性，从而提高脱水性能。
