Reclaiming spent liquor from cotton reactive dyebaths using nanofiltration membrane for possible reuse of water and salt

Shu, L., Waite, T.D., Bliss, P.J., Pailthorpe, M.T., and Jegatheesan, V. (2003) Reclaiming spent liquor from cotton reactive dyebaths using nanofiltration membrane for possible reuse of water and salt. In: Proceedings of Asian Waterqual 2003 IWA-Asia Pacific Regional Conference. From: Asian Watrequal 2003 IWA-Asia Pacific reginal Conference, 19-23 October 2003, Bangkok, Thailand.

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Abstract

During dyeing, salts are placed in a dyebath to aid the fixation of various dyes on to the fabric while bases are added to raise the pH from around neutral to pH 11. Afterwards, the used dyebath solution, called dyebath spent liquor, is discharged with almost all the salts and bases added as well as unfixed dyes. Consequently, a lot of raw materials are lost in the waste stream ending up in the environment as pollutants. In this study, possibilities of reusing water and salts of dyebathes were investigated, using a nanofiltration membrane. When the salt concentration in the spent liquor was increased from 10 to 80 g/L, the salt rejection by membrane was found to decrease initially; however, the salt rejection increased over the time, which was not expected. The aggregation of dye was also studied and found to decrease in the concentrate when the salt concentration was increased. This may be due to the aggregation of salt in the concentrate, which explains the increase in salt rejection. This information is useful for the textile industry in evaluating the treated water quality for the purpose of reuse.

Item ID: 7582
Item Type: Conference Item (Refereed Research Paper - E1)
Keywords: dye aggregation; dye rejection; nanofiltration membrane; salt associates; salt rejection
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ISBN: 978-1-84339-482-2
Date Deposited: 08 Apr 2010 23:24
FoR Codes: 09 ENGINEERING > 0907 Environmental Engineering > 090702 Environmental Engineering Modelling @ 100%
SEO Codes: 96 ENVIRONMENT > 9699 Other Environment > 969999 Environment not elsewhere classified @ 100%
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