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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
Toward Resource Recovery from Textile Wastewater: Dye Extraction, Water and Base/Acid Regeneration Using a Hybrid NF-BMED Process
ACS Sustainable Chemistry and Engineering, Volume 3, No. 9, Year 2015
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Description
In this work, textile wastewater is explored for resource recovery in a hybrid loose nanofiltration (NF)-bipolar membrane electrodialysis (BMED) process for fractionation of dyes and salt, in view of dye purification and water and salt reuse. A loose nanofiltration membrane, i.e., Sepro NF 6 (Ultura), found to have a low salt rejection (0.27% in 120 g·L-1 NaCl solution) and high rejection for direct dyes and reactive dyes (≥99.93%), was used for fractionation of dye/salt mixtures through diafiltration. In diafiltration, the addition of pure water with a volume factor of 5.0 can effectively remove the NaCl salt by using Sepro NF 6 with an invariable dye concentration, in view of the recovery of high purity dyes. The overall salt rejections in diafiltration for the dye/salt mixtures with 40, 50 and 60 g·L-1 NaCl are 2.2%, 1.8% and 1.1%, respectively, enabling a further treatment by BMED. Subsequently, application of BMED for reuse of salt-containing NF permeate demonstrates that desalinated water with ∼100 ppm of NaCl can be obtained, and base/acid can be produced from the salts without any membrane fouling by dyes. Therefore, the hybrid loose NF-BMED process allows for resource (i.e., dye, salt and pure water) extraction from textile wastewater, which closes the salt and water cycle, in view of process intensification. © 2015 American Chemical Society.
Authors & Co-Authors
Lin, Jiuyang
Belgium, Leuven
Ku Leuven
Baltǎ, Ștefan
Romania, Galati
Universitatea Dunarea de Jos Din Galati
Shen, Jiangnan
China, Hangzhou
Zhejiang University of Technology
Sotto, A.
Spain, Madrid
Universidad Rey Juan Carlos
Luis, Patricia
Belgium, Louvain-la-neuve
Université Catholique de Louvain
van der Bruggen, Bart
Belgium, Leuven
Ku Leuven
Statistics
Citations: 106
Authors: 6
Affiliations: 7
Identifiers
Doi:
10.1021/acssuschemeng.5b00234
ISSN:
21680485
Research Areas
Environmental
Mental Health