Hypochlorite oxidation coupled with FeCl3 flocculation to improve sludge dewatering

被引：0

作者：

Pan W. ^{[1
,2
]}

Zhang X. ^{[1
]}

Li J. ^{[1
]}

Gu L. ^{[2
]}

He Q. ^{[2
]}

Ao L. ^{[2
,3
]}

机构：

[1] School of River and Ocean Engineering, Chongqing Jiaotong University, Chongqing

[2] Key laboratory of Three Gorges Reservoir Area, Ministry of Education, Chongqing University, Chongqing

[3] Chongqing Municipal Research Institute of Design, Chongqing

来源：

Huagong Jinzhan/Chemical Industry and Engineering Progress | 2024年 / 43卷 / 06期

关键词：

dewatering performance; ferric chloride; flocculation; hypochlorite; oxidation; sludge;

D O I：

10.16085/j.issn.1000-6613.2023-0858

中图分类号：

学科分类号：

摘要：

In this experiment, hypochlorite coupled with FeCl3 flocculation was used to study the dewatering performance of sludge. The optimal pretreatment conditions were determined by single factor experiment. The mechanism of the pretreatment promoting the sludge dewatering performance was analyzed and clarified by using characterization methods such as zeta potential, protein polysaccharide, DNA content, magnetic field nuclear resonance, three-dimensional fluorescence and cell visualization. Pearson correlation analysis was used to further analyze the reasons for the improvement of sludge dewatering performance. The results showed that the sludge dewatering efficiency reached the highest when the dosage of NaClO was 50mg/g TS and FeCl3 was 100mg/g TS. The specific resistance and CST of the original sludge decreased from 2.45×1012m/kg and 119.7s to 9.3×1011m/kg and 27.9s, respectively. Sludge lost the most water and dehydrates the fastest. Under the combined action of oxidation and flocculation, the EPS structure of the sludge was destroyed, the sludge particles were loose, and the internal bound water was released. The increase of DNA content in sludge and the visualization analysis of sludge showed that the cell membrane of microorganism in the floc was destroyed, resulting in the release of intracellular water, thus improving the dehydration efficiency of activated sludge. © 2024 Chemical Industry Press Co., Ltd.. All rights reserved.

引用

页码：3450 / 3458

页数：8

共 35 条

[1] CAO Bingdi, ZHANG Tao, ZHANG Weijun, Et al., Enhanced technology based for sewage sludge deep dewatering: A critical review, Water Research, 189, (2021)
[2] AI Jing, WANG Zhiyue, DIONYSIOU Dionysios D, Et al., Understanding synergistic mechanisms of ferrous iron activated sulfite oxidation and organic polymer flocculation for enhancing wastewater sludge dewaterability, Water Research, 189, (2021)
[3] WEI Hua, HU Pan, LI Aimin, Et al., Evaluation of acidification and oxidation of sludge to improve the effect of a starch-based flocculant on the dewaterability of sewage sludge, Journal of Environmental Management, 231, pp. 405-412, (2019)
[4] WEI Liangliang, XIA Xinhui, ZHU Fengyi, Et al., Dewatering efficiency of sewage sludge during Fe2+-activated persulfate oxidation: Effect of hydrophobic/hydrophilic properties of sludge EPS, Water Research, 181, (2020)
[5] CHEN Zhan, ZHANG Weijun, WANG Dongsheng, Et al., Enhancement of waste activated sludge dewaterability using calcium peroxide preoxidation and chemical re-flocculation, Water Research, 103, pp. 170-181, (2016)
[6] WU Boran, WANG Hao, LI Wenxuan, Et al., Influential mechanism of water occurrence states of waste-activated sludge: Potential linkage between water-holding capacity and molecular compositions of EPS, Water Research, 213, (2022)
[7] GUAN Renpeng, YUAN Xingzhong, WU Zhibin, Et al., Principle and application of hydrogen peroxide based advanced oxidation processes in activated sludge treatment: A review, Chemical Engineering Journal, 339, pp. 519-530, (2018)
[8] YU Wenbo, WEN Qianqian, YANG Jiakuan, Et al., Unraveling oxidation behaviors for intracellular and extracellular from different oxidants (HOCl vs. H2O2) catalyzed by ferrous iron in waste activated sludge dewatering, Water Research, 148, pp. 60-69, (2019)
[9] YU Wenbo, YANG Jiakuan, SHI Yafei, Et al., Roles of iron species and pH optimization on sewage sludge conditioning with Fenton’s reagent and lime, Water Research, 95, pp. 124-133, (2016)
[10] YU Y, CHAN W I, LIAO P H, Et al., Disinfection and solubilization of sewage sludge using the microwave enhanced advanced oxidation process, Journal of Hazardous Materials, 181, pp. 1143-1147, (2010)

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