Recovery of caustic from mercerizing wastewaters of a denim textile mill

Recovery of caustic from mercerizing wastewaters of a denim textile mill

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...

Full description

Saved in:
Bibliographic Details
Published in:Desalination and water treatment Vol. 53; no. 12; pp. 3418 - 3426
Main Authors: Varol, Cihangir, Uzal, Nigmet, Dilek, Filiz B., Kitis, Mehmet, Yetis, Ulku
Format: Journal Article
Language:English
Published: Abingdon Elsevier Inc 20-03-2015
Elsevier Limited
Subjects:
Alkalies
Caustic recovery
Centrifugation
Color
Flocculation
Flow velocity
Flux
Membrane filtration
Membrane processes
Membranes
Mercerizing wastewater
Nanofiltration
Nanotechnology
Pretreatment
Recovering
Rejection
Sodium hydroxide
Textile industry
Ultrafiltration
Waste water
Mercerizing wastewater
Caustic recovery
Textile industry
Membrane filtration
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary: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°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.
Bibliography:ObjectType-Article-1
SourceType-Scholarly Journals-1
ObjectType-Feature-2
content type line 23
ISSN:1944-3986
1944-3994
1944-3986
DOI:10.1080/19443994.2014.934116