Biological treatment and nanofiltration of denim textile wastewater for reuse

UZAL, Nigmet
Yetiş, Ülkü
Dilek, Filiz Bengü
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 not adversely affect system performance. Although biological treatment is quite efficient, the wastewater does not meet the reuse criteria. Hence, further treatment to improve treated water quality was investigated using nanofiltration. Dead-end microfiltration (MF) with 5 mu m pore size was applied to remove coarse particles before nanofiltration. The color rejection of nanofiltration was almost complete and permeate color was always lower than 10 Pt-Co. Similarly, quite high rejections were observed for COD (80-100%). Permeate conductivity was between 1.98 and 2.67 mS/cm (65% conductivity rejection). Wastewater fluxes were between 31 and 37 L/m(2)/h at 5.07 bars corresponding to around 45% flux declines compared to clean water fluxes. In conclusion, for denim textile wastewaters nanofiltration after biological treatment can be applied to meet reuse criteria.


Ozonation pre and post-treatment of denim textile mill effluents: Effect of cleaner production measures
Morali, E. Kaan; UZAL, NİĞMET; Yetiş, Ülkü (2016-11-20)
Denim production, which is one of the leading sub-sectors of textile industry that generates considerable amount of wastewater with high pollution load both from dyeing and finishing processes. This sub-sector is therefore to consider cleaner production opportunities for these processes to reduce its wastewater generation and pollution load. In a denim-producing plant, the wastewater treatability studies have revealed that the most technically applicable cleaner production alternatives are caustic recovery ...
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 ...
Evaluation of wastewater treatment alternatives for different water reuse applications with modeling and cost analysis
Uyanık, Pınar; Bayramoğlu, Tuba Hande; Aksoy, Ayşegül; Department of Environmental Engineering (2020-10-22)
Wastewater reclamation can be a solution to water scarcity. Several wastewater treatment schemes exist for specific water reuse applications. This thesis aims to evaluate different wastewater treatment schemes for a range of water reuse applications through modeling and cost analysis. For this purpose, different secondary level treatment schemes as conventional activated sludge (TS_A), extended aeration (TS_B) and A2O (TS_C) were modeled using BioWin for three wastewater characteristics and three flow...
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...
Citation Formats
E. ŞAHİNKAYA, N. UZAL, Ü. Yetiş, and F. B. Dilek, “Biological treatment and nanofiltration of denim textile wastewater for reuse,” JOURNAL OF HAZARDOUS MATERIALS, pp. 1142–1148, 2008, Accessed: 00, 2020. [Online]. Available: