Recovery of brackish water from reactive dyeing wastewater by ultrafiltration

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 pressure (TMP) until a volume reduction factor (VRF) of 2.5, while color was reduced to less than 1% of the feed. The first stage 2 kDa at 4 bar experienced slight flux decline, however, the fouling was fully reversible just with physical cleaning. With this scenario, when the VRF was increased to 10 to increase the water recovery and TMP was increased to 4 bar to increase the permeate flux, the permeate quality remained similar, even when the pollutant load in the feed stream was doubled. With the 5 kDa + 2 kDa scenario, while TOC and color removals were somewhat less, the average first stage flux was about four times higher than that of the first stage 2 kDa filtration, although flux decline and partial fouling irreversibility were still observed. On the other side, the 5 kDa + 5 kDa scenario was the poorest in performance as 5 kDa membrane showed slightly lower retention of color and TOC with higher flux decline and poorer fouling reversibility; although the permeate flux was high. Considering the advantages of high retention and high flux, the permeate samples from both 2 kDa + 2 kDa and 5 kDa + 2 kDa scenarios were tested in fabric dyeing and found to be successful even with a color that is different than the color of the wastewater. These findings suggest that the proposed treatment scenario to recover salty water for reuse can be applicable for wastewater of changing characteristics, which is typical for textile dyeing processes.


Preparation of sericin based wound dressing and investigation of its biomaterial properties
Aktürk, Ömer; Keskin, Dilek; Department of Engineering Sciences (2009)
In this study, it was aimed to produce sericine/collagen composite membranes and to investigate their properties as a wound dressing. Different membrane compositions were prepared by casting and solvent evaporation method. After initial studies for optimization of ratios, membrane groups at two different thicknesses were prepared for each selected ratio and cross-linked with 3 % (w/v) glutaraldehyde (GTA). Considering the wound dressing requirements, equilibrium degree of swelling (EDS), water vapor transmi...
Recovery of caustic from mercerizing wastewaters of a denim textile mill
Varol, Cihangir; UZAL, NİĞMET; Dilek, Filiz Bengü; KİTİŞ, Mehmet; Yetiş, Ülkü (2015-03-20)
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 ...
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...
Removal of Pesticides from Wastewater by Membrane Proces
Ateş, Nuray; Uzal, Niğmet; Yetiş, Ülkü; Dilek, Filiz Bengü (2021-06-23)
Purpose: The aim of this study was to investigate the removal performances of four pesticides (tributyl phosphate, flutriafol, dicofol and irgarol) by RO membranes. Methods: Three different RO membranes (BW30-LE, SW30-XLE and GE-AD) were used to reject pesticides in two transmembrane pressures of 10 and 20 bar in bench-scale membrane filtration cell. Tributyl phosphate and flutriafol were detected by GC/MS and dicofol and irgarol were monitored by HLPC instruments. Results: While the highest removal of trib...
Process optimization on clean water recovery from real reactive dyeing effluents by nanofiltration
Koçer Oruç, Burcu; Yetiş, Ülkü; Çulfaz Emecen, Pınar Zeynep; Department of Environmental Engineering (2017)
Clean water recovery from the reactive dyeing effluent of a cotton textile mill with membrane filtration was investigated. Lab-scale experiments were performed with wastewater samples taken from the last three steps of the dyeing line, comprising four sequential baths of dyeing, warm rinsing, washing with soap, and lukewarm rinsing. Waste dyeing bath was deliberately excluded considering its extremely high salt and color contents. Two sets of experiments were performed; direct nanofiltration (NF) and NF wit...
Citation Formats
M. Erkanlı, R. D. ZAF, L. Yılmaz, P. Z. Çulfaz Emecen, and Ü. Yetiş, “Recovery of brackish water from reactive dyeing wastewater by ultrafiltration,” 2017, Accessed: 00, 2020. [Online]. Available: