文献类型：期刊文献

英文题名：Diatomite precoat filtration for wastewater treatment: Filtration performance and pollution mechanisms

作者：Guo, Dan[1];Wang, Hualin[1];Fu, Pengbo[1];Huang, Yuan[1];Liu, Yi[1];Lv, Wenjie[1];Wang, Fei[1]

机构：[1]East China Univ Sci & Technol, State Environm Protect Key Lab Environm Risk Asse, Shanghai 200237, Peoples R China

年份：2018

卷号：137

起止页码：403

外文期刊名：CHEMICAL ENGINEERING RESEARCH & DESIGN

收录：;EI(收录号：20183305700650);WOS:【SCI-EXPANDED(收录号:WOS:000446949200033)】；

基金：The authors would like to express their sincere gratitude to the National Science Foundation for Distinguished Young Scholars of China (Grant No. 51125032) and the Fundamental Research Funds for the Central Universities (222201814022).

语种：英文

外文关键词：Wastewater treatment; Diatomite precoat filtration; Filtration performance; Fouling models; Pollutant transport

摘要：As wastewater processing facilities deal with increasing amount in combination with enhanced environmental pressures, diatomite precoat filtration is becoming one of the promising methods for wastewater treatment. Filtration performance of diatomite precoat filtration with five different coating layer thicknesses for wastewater treatment was investigated in terms of permeate flux, fouling grade, filtration resistance, permeate quality and fouling reversibility. Pollution mechanism was revealed by fitting Hermia's fouling models, detecting the pollutant transport and analyzing the changes in microstructure of diatomite. The optimal thickness of diatomite precoat filtration was 4 mm, which exhibited that the highest average permeate flux was 16.53 L/m(2)h, total fouling resistance reduced by 59.5%, and lowest cake water content was 55.1%. Contact angle measurement indicated that the fouling formed on the diatomite coating layer was highly reversible. Compared with individual fouling model, the combination of three Hermia's fouling models at different stages fitted the flux data well. FESEM images of diatomite particles confirmed high filtration flux and supported the pollutant transport results. The superiority of diatomite precoat filtration in improving filtration performance and mitigation fouling was demonstrated. The present study could also provide an experimental basis for optimizing precoat filtration process. (C) 2018 Published by Elsevier B.V. on behalf of Institution of Chemical Engineers.