Recovery of caustic from mercerizing wastewaters of a denim textile mill

Varol, Cihangir
Dilek, Filiz Bengü
KİTİŞ, Mehmet
Yetiş, Ülkü
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.


Purification and Concentration of Caustic Mercerization Wastewater by Membrane Processes and Evaporation for Reuse
Tunç, Müslün Sara; Yılmaz, Levent; Yetiş, Ülkü; Çulfaz Emecen, Pınar Zeynep (2014-01-01)
A membrane-based treatment strategy was developed for purifying the highly alkaline textile mercerization wastewater. 0.2-mu m MF and 100 kDa UF membranes were evaluated as pretreatment alternatives before 10 kDa UF and 200 Da NF membranes. Turbidity was almost totally removed by both pretreatment options, while UF (100 kDa) showed higher COD retention than MF. In total recycle mode of filtration, fouling of both UF and MF membranes were 80% reversible by physical and almost totally reversible (>= 97%) by c...
Recovery of brackish water from reactive dyeing wastewater by ultrafiltration
Erkanlı, Mert; ZAF, RUKEN DİLARA; Yılmaz, Levent; Çulfaz Emecen, Pınar Zeynep; Yetiş, Ülkü (2017-02-06)
In this study, brackish water recovery from a real reactive dyeing textile effluent for reuse of water and salt was investigated. With the aim of improving the overall retention of species that are partly retained in a single stage, three different two-stage ultrafiltration scenarios were considered: 5 kDa followed by 5 kDa, 5 kDa followed by 2 kDa and 2 kDa followed by 2 kDa. The 2 kDa + 2 kDa scenario reduced the total organic carbon (TOC) from 239 +/- 9 mg/L to 41 +/- 7 mg/L, at 2 bar of transmembrane pr...
Treatment of a denim producing textile industry wastewater using pilot-scale membrane bioreactor
YİĞİT, Nevzat Özgü; Uzal, N.; KÖSEOĞLU, Hasan; Harman, I.; Yukseler, H.; Yetiş, Ülkü; CİVELEKOĞLU, Gökhan; KİTİŞ, Mehmet (Elsevier BV, 2009-05-15)
The objective of this study was to investigate the performance of a pilot-scale membrane bioreactor (MBR) system for the treatment of a highly concentrated mixed wastewater from wet processes (dyeing, finishing, and sizing) of a denim producing textile industry. The MBR system, containing a Submerged hollow fiber membrane module in the aeration tank, was operated aerobically for about 3 months on-site at a continuous flow mode. The system was operated at two different operation stages: (1) 110 Sludge wastag...
Biological treatment and nanofiltration of denim textile wastewater for reuse
ŞAHİNKAYA, Erkan; UZAL, Nigmet; Yetiş, Ülkü; Dilek, Filiz Bengü (2008-05-30)
This study aims at coupling of activated sludge treatment with nanofiltration to improve denim textile wastewater quality to reuse criteria. In the activated sludge reactor, the COD removal efficiency was quite high as it was 91 +/- 2% and 84 +/- 4% on the basis of total and soluble feed COD, respectively. The color removal efficiency was 75 +/- 10%, and around 50-70% of removed color was adsorbed on biomass or precipitated within the reactor. The high conductivity of the wastewater, as high as 8 mS/cm, did...
Recovery and reuse of indigo dyeing wastewater using membrane technology
Uzal, Niğmet; Yetiş, Ülkü; Department of Environmental Engineering (2007)
The objective of this study is to develop a membrane-based generic treatment scheme for wastewaters of indigo dyeing process of denim industry, based on water reuse. For this purpose, firstly the performances of microfiltration (MF), coagulation, and ultrafiltration (UF) processes were evaluated as pretreatment alternatives and the best pretreatment alternatives appeared to be single stage 5 m MF and sequential 5 m MF followed by 100 kDa UF providing high permeation rate and high color retention. These two ...
Citation Formats
C. Varol, N. UZAL, F. B. Dilek, M. KİTİŞ, and Ü. Yetiş, “Recovery of caustic from mercerizing wastewaters of a denim textile mill,” DESALINATION AND WATER TREATMENT, pp. 3418–3426, 2015, Accessed: 00, 2020. [Online]. Available: