膜科学与技术

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Performance and membrane fouling properties in an UF treatment process for rare earth smelting wastewater

Authors： GUI Shuang-lin 1,2,MAI Zhaohuan2，WEI Yuansong3, FU Jia-qi2,CHEN xiaoping2， WAN Jinbao1*

Units： 1. Key laboratory of Poyang Lake Environment and Resource Utilization,Ministry of Education, School of Resource Environmental and Chemical Engineering, Nanchang University, Nanchang, 330029,China; 2. Energy Research Institute of Jiangxi Academy of Sciences, Nanchang , 330096, China) 3.Laboratory of Water Pollution Control Technology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China

KeyWords： ultrafiltration；rare earth smelteries；membrane fouling；wastewater treatment

ClassificationCode：X703

year,volume(issue):pagination： 2020,40(5):77-84

Abstract：

In this study, the UF membrane was used to treat rare earth smelting wastewater by cross-flow filtration. The treatment efficiency and the characteristics of fouled membrane were studied. Then the total resistance of the membrane fouling and its composition were calculated.
The results showed that the proportions of membrane intrinsic resistance (Rm) was relatively high.
Membrane fouling resistance was mainly composed by cake layer resistance (Rc) and pore blocking resistance (Rf), and the concentration polarization resistance (Rp) was weak. The treatment efficiency of ultrafiltration membrane, and the differerce permeate flux on filtrate time and transmembrane pressure were investigated . When the transmembrane pressure was 0.1-0.5MPa, the average removal rates of COD and turbidity were 26.5% and 77.7%, respectively. SEM-EDX analysis results revealed that there were a large number of particulate matter and crystalline substances in the film surface, and Na, Ca, Cl, and S were the main inorganic elements. Finally, five different types of chemical cleaning reagents: pure water, HCl , NaOH, NaClO,and EDTA solutions, respectively,were used to clean the fouled membrane. Then the composition of eluants, the morphology of fouled membrane and cleaning membrane were analyzed.The results showed that 0.1mol/L HCl had better removal effect on inorganic metal ions, while 0.1mol/LNaOH had better removal effect on organic compounds, especially for humic acids and aromatic compounds.

Funds：

国家自然科学基金资助项目（21567009）；江西省重点研发计划项目(2017ACG70018)

AuthorIntro：

桂双林(1984—)，男，湖南永州，副研究员，博士研究生，研究方向：膜法水处理技术研究，E-mail：gsl503@163.com

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