Pollution and Cleaning of PDMS Pervaporation Membranes after Recovering Ethyl Acetate from Aqueous Saline Solutions

被引:2
作者
Sun, Xuefei [1 ,2 ]
Pan, Yang [1 ]
Shen, Chunxiang [1 ,2 ]
Zuo, Chengye [1 ]
Ding, Xiaobin [2 ]
Liu, Gongping [1 ]
Xing, Weihong [1 ]
Jin, Wanqin [1 ]
机构
[1] Nanjing Tech Univ, Coll Chem Engn, State Key Lab Mat Oriented Chem Engn, 30 Puzhou Rd S, Nanjing 211816, Peoples R China
[2] NanJing Jiusi High Tech Co Ltd, 1 Yuansi Rd, Nanjing 211000, Peoples R China
基金
中国国家自然科学基金;
关键词
ethyl acetate; salt; wastewater; pervaporation; backflushing; SOLUTION-DIFFUSION-MODEL; COMPOSITE MEMBRANES; INORGANIC SALTS; ETHANOL;
D O I
10.3390/membranes12040404
中图分类号
Q5 [生物化学]; Q7 [分子生物学];
学科分类号
071010 ; 081704 ;
摘要
The removal of volatile organic compounds (VOCs) from wastewater containing nonvolatile salts has become an important and interesting case of the application of the pervaporation (PV) process. The aim of this study was to evaluate the influence of salts on the PV removal of ethyl acetate from wastewater using a polydimethylsiloxane (PDMS) membrane. The fouled membrane was then characterized via scanning electron microscopy-energy-dispersive X-ray analysis (SEM-EDX) to investigate salt permeation. The membrane backflushing process was carried out by periodically flushing the permeate side of the tubular membrane. The results demonstrated that salts (NaCl and CaCl2) could permeate through the PDMS membrane and were deposited on the permeate side. The presence of salts in the feed solution caused a slight increase in the membrane selectivity and a decrease in the permeate flux. The flux decreased with increasing salt concentration, and a notable effect occurred at higher feed-salt concentrations. A permeate flux of up to 98.3% of the original flux was recovered when the permeation time and backflushing duration were 30 and 5 min, respectively, indicating that the effect of salt deposition on flux reduction could be mitigated. Real, organic, saline wastewater was treated in a pilot plant, which further verified the feasibility of wastewater PV treatment.
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页数:15
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