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Recovery of caustic from mercerizing wastewaters of a denim textile mill
Date
2015-03-20
Author
Varol, Cihangir
UZAL, NİĞMET
Dilek, Filiz Bengü
KİTİŞ, Mehmet
Yetiş, Ülkü
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This work is licensed under a
Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License
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The objective of this study was to evaluate caustic recovery from mercerizing wastewater originating from a denim textile producing plant using membrane technology. For this purpose, ultrafiltration (UF) and nanofiltration (NF) processes were considered. In the first stage, in an attempt to control the possible membrane fouling, pretreatment alternatives of flocculation, centrifugation, and microfiltration were evaluated. These pretreatment application alternatives were unsuccessful as they did not provide considerable color and solids removal. In the second stage, UF and NF processes were tested using a tight UF membrane (GR95PP, Alfalaval) and three NF membranes (NP010 and NP030, Microdyn Nadir, and MPF34, Koch Membranes) to accomplish the caustic recovery without applying any pretreatment. The best performance was obtained with NP010 NF in terms of permeate flux along with color and COD rejections. Then, for this membrane the effects of transmembrane pressure (4.03 and 6.23 bar), cross-flow velocity (from 0.40 to 1.40 m/s), and feed temperature (20 and 40 degrees C) were investigated. Temperature positively affected the permeate flux without significant loss in recovery and rejections. Caustic stream produced had about 98-100% of NaOH in the feed at a concentration of 30-40 g/L and therefore was recyclable after a concentration process.
Subject Keywords
Mercerizing wastewater
,
Caustic recovery
,
Membrane filtration
,
Textile industry
URI
https://hdl.handle.net/11511/48733
Journal
DESALINATION AND WATER TREATMENT
DOI
https://doi.org/10.1080/19443994.2014.934116
Collections
Department of Environmental Engineering, Article