School of Urban Construction, Wuhan University of Science and Technology, 2 of Huangjiahu West Road, Hongshan District, Wuhan 430065, Hubei, China E-mail:
Water Sci Technol. 2021 Sep;84(6):1464-1476. doi: 10.2166/wst.2021.337.
The effects of thermally and Fe(II) activated potassium persulfate (PPS) on sludge dewatering performance were compared systematically. Sludge dewaterability was monitored by measuring capillary suction time (CST) and sludge specific resistance to filtration (SRF), and the degradation effect was characterized by chemical oxygen demand (COD), total organic carbon (TOC), ammonia nitrogen (NH-N) and extracellular polymeric substances (EPS). The change of extracellular polymer substance (EPS) including soluble, loosely bound and tightly bound EPS (S-EPS, LB-EPS and TB-EPS) with time and PPS dosage was monitored to discuss the oxidation efficiency of thermally and Fe(II) activated PPS. Sludge supernatant was analyzed by three-dimensional fluorescence excitation-emission spectra (3D-EEM) to confirm the protein transformation. The result showed that sludge dewaterability in terms of CST and SRF were enhanced with increasing PPS dosage and condition time of two activated methods. While Fe(II) activated PPS could reduce sludge CST and SRF to preferred values at low PPS dosage and short condition time. Meanwhile, sludge degradation effect was also more obvious. Mechanically, sludge TB-EPS in proteins and polysaccharides converted to SB-EPS was faster with Fe(II) activated PPS. In addition, thermally activated PPS tended to oxidize the protein in the supernatant first.
系统比较了热和 Fe(II) 激活过硫酸钾 (PPS) 对污泥脱水性能的影响。通过测量毛细吸留时间 (CST) 和污泥比过滤阻力 (SRF) 来监测污泥脱水性能，并通过化学需氧量 (COD)、总有机碳 (TOC)、氨氮 (NH-N) 和胞外聚合物物质 (EPS) 来表征降解效果。监测了时间和 PPS 剂量对胞外聚合物物质 (EPS) 的变化，包括可溶性、松散结合和紧密结合 EPS (S-EPS、LB-EPS 和 TB-EPS)，以讨论热和 Fe(II) 激活 PPS 的氧化效率。通过三维荧光激发-发射光谱 (3D-EEM) 分析污泥上清液，以确认蛋白质的转化。结果表明，随着 PPS 剂量和两种激活方法的条件时间的增加，污泥的脱水性能（以 CST 和 SRF 表示）得到了提高。而 Fe(II) 激活 PPS 可以在低 PPS 剂量和短条件时间下降低污泥 CST 和 SRF 至优选值。同时，污泥的降解效果也更加明显。从机械上讲，Fe(II) 激活 PPS 更快地将 TB-EPS 中的蛋白质和多糖转化为 SB-EPS。此外，热激活 PPS 倾向于先氧化上清液中的蛋白质。
