Department of Environmental Science and Engineering, School of Energy and Environment, Southeast University, No. 2 Sipailou Street, Nanjing 210096, China E-mail:
School of Economics and Management, Tianjin Chengjian University, No. 26 Jinjing Road, Xiqing District, Tianjin 300384, China.
Water Sci Technol. 2022 Feb;85(3):851-861. doi: 10.2166/wst.2022.014.
A novel technique to enhance sludge dewaterability with zero-valent iron-activated persulfate (ZVI/PDS) and hydrothermal treatment (HT) under mild temperature is proposed in this study. Key operating parameters were considered to study their influences on the dewaterability of sludge. Comparative studies of organic matter, especially extracellular polymeric substances (EPS), were analyzed carefully to reveal the mechanisms involved. The results indicated that the specific resistance to filtration declined by 86.72%, and the capillary suction time reduced by 72.35% compared with the raw sludge under optimal conditions of 100 mg/g TSS ZVI and 200 mg/g TSS PDS doses at 120 °C. Soluble protein and fulvic acid-like in EPS were the key components affecting the sludge dewatering performance. The disappearance of the peak in the amide III led to a decrease in hydrophilic functional groups, which helped to improve sludge dewaterability.
本研究提出了一种在温和温度下利用零价铁激活过硫酸盐（ZVI/PDS）和水热处理（HT）来增强污泥脱水性能的新技术。研究了关键操作参数对污泥脱水性能的影响。对有机物，特别是细胞外聚合物（EPS）进行了详细的比较研究，以揭示所涉及的机制。结果表明，与原始污泥相比，在 120°C 下，TSS ZVI 用量为 100mg/g 和 TSS PDS 用量为 200mg/g 的最佳条件下，过滤比阻降低了 86.72%，毛细吸水时间降低了 72.35%。EPS 中的可溶性蛋白质和富里酸样物质是影响污泥脱水性能的关键成分。酰胺 III 峰的消失导致亲水性官能团减少，有助于提高污泥的脱水性能。
