Magnetic micro-particle conditioning-pressurized vertical electro-osmotic dewatering (MPEOD) of activated sludge: Role and behavior of moisture and organics
Magnetic micro-particle conditioning-pressurized vertical electro-osmotic dewatering (MPEOD) of activated sludge: Role and behavior of moisture and organics
复制标题
磁性微粒调节 — 活性污泥加压立式电渗脱水 (MPEOD)：水分和有机物的作用和行为
DOI：
10.1016/j.jes.2018.02.020
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发表时间：
2018-12-01
影响因子：
6.9
通讯作者：
Zheng, Huaili
中科院分区：
文献类型：
--
作者：
Guo, Xinxin;Qian, Xu;Zheng, Huaili
建立了磁性微粒调质-加压垂直电渗脱水（MPEOD）工艺，研究了各阶段活性污泥基质中水分、胞外聚合物（EPS）等有机物的分布和迁移规律。结果表明，MPEOD工艺可使脱水AS的含水率达到53.52%，结合水和自由水的去除率分别为82.97%和99.67%。磁微粒（MMPs）的凝血和时间延迟磁场效应沿着MMPC-DG-MC阶段启动了AS中部分BW向FW的转化。EC对BW具有电渗和压力的耦合驱动作用，EC阶段pH和温度的变化引起AS絮体的聚集和部分BW的释放。此外，MMPs剂量进一步改善AS的脱水性能，作为骨架建设者提供水通道。同时，MMPs可使污泥细胞和EPS组分解体，从而降低LB-EPS中类蛋白质和类副产物的含量，降低AS基质中蛋白质/多糖的比值，提高AS的过滤性能。EC阶段，EPS荧光区域积分分析的前4个Ex/Em区域明显减少，特别是LB-和TB-EPS中的类蛋白质，这有助于AS脱水性能的提高。(c)2017中国科学院生态环境科学研究中心由爱思唯尔公司出版
In this study, a magnetic micro-particle conditioning-pressurized vertical electro-osmotic dewatering (MPEOD) process with magnetic micro-particle conditioning-drainage under gravity-mechanical compression-electrical compression (MMPC-DG-MC-EC) stages was established to study the distribution and migration of water, extracellular polymeric substances (EPS), and other organic matter in the activated sludge (AS) matrix at each stage. Results showed that the MPEOD process could attain 53.52% water content (WC) in dewatered AS with bound water (BW) and free water (FW) reduction rates of 82.97% and 99.67%, respectively. The coagulation and time-delayed magnetic field effects of magnetic microparticles (MMPs) along the MMPC-DG-MC stages initiated the transformation of partial BW to FW in AS. EC had a coupling driving effect of electro-osmosis and pressure on BW, and the changes in pH and temperature at EC stage induced the aggregation of AS flocs and the release of partial BW. Additionally, MMPs dosing further improved the dewatering performance of AS by acting as skeleton builders to provide water passages. Meanwhile, MMPs could disintegrate sludge cells and EPS fractions, thereby reducing tryptophan-like protein and byproduct-like material concentrations in LB-EPS as well as protein/polysaccharide ratio in AS matrix, which could improve AS filterability. At EC stage, the former four Ex/Em regions of fluorescence regional integration analysis for EPS were obviously reduced, especially the protein-like substances in LB-and TB-EPS, which contributed to improvement of AS dewaterability. (c) 2017 The Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences. Published by Elsevier B.V.