Most effective pre-treatment to nanofiltration for the recovery of print dyeing wastewaters

This paper presents the determination of the best pre-treatment method to nanofiltration (NF) for the recoverv of print dyeing wastewaters (PDW) of the carpet manufacturing industry. Chemical precipitation (CP) with optimum alum (Al-2 SO4.18H O-2) dose was chosen among five alternatives; 1) Dead-end microfiltration (MF), 2) CP with optimum coagulant dose, 3) CP with low coagulant dose and polyelectrolyte aid, 4) CP with low coagulant dose followed by MF, 5) CP with high coagulant dose followed by ultrafiltration (UF). In the selected process, an optimum alum dose of 150 mg/L provided color and turbidity removal efficiencies of > 90%. The effectiveness of the selected pre-treatment method for flux control in post NF was also tested. Perfect rejection of COD, color and turbidity was achieved in NF, accompanied by a stable flux decline of around 22%. Moreover, the flux decline was mainly due to concentration polarization rather than fouling, indicating reversible flux decline.


Microfiltration/ultrafiltration as pretreatment for reclamation of rinsing waters of indigo dyeing
Uzal, Nigmet; Yılmaz, Levent; Yetiş, Ülkü (Elsevier BV, 2009-05-15)
This paper focuses Oil the applicability of microfiltration (MF)/ultrafiltration (UF) as a pretreatment to nanofiltration (NF) for the reclamation of rinsing waters of indigo dyeing process. Two different MF alternatives, single 5 mu m MF and sequential 5 mu m + 0.45 mu m MF, were evaluated as prefiltration to improve the performance of the proceeding UF stage. UF tests performed after 5 pin MF Using 100 kDa, 50 kDa, 20 kDa, 2 kDa and 1 kDa membranes have indicated that all the UF membranes provided the sam...
Assessing the Effects of Mechanical Preventive Measures on Alkali-Silica Reaction Expansion with Accelerated Mortar Bar Test
Musaoglu, Orhan; TURANLI, LUTFULLAH; Sarıtaş, Afşin (ASTM International, 2014-11-01)
This paper presents a modification to the apparatus of the mortar bar test of ASTM C490 in order to assess and compare the influence of mechanical preventive measures in reducing alkali-silica reaction (ASR) expansion in concrete with respect to the traditional measures. For this purpose, reinforced mortar specimens with or without pre-stressing force applied were examined and the effects of the reinforcement ratio and pre-stressing force on ASR-induced expansion and cracking were studied through the accele...
An Electrochemical Procedure to Form Metal Powders from Recycled Hard Particle Embedded Composite Cutting Tools
Altunbasak, Tansu; KUL, MEHMET; Karakaya, İshak (2017-06-01)
Used valuable particle embedded composite cutting tools, obtained by powder metallurgy techniques by mixing metallic powders with hard, abrasive particles were electrolyzed for reclamation of metallic powders and valuable particles. The effects of copper ion and sulfuric acid concentrations and pH of the electrolyte, current density and temperature on microstructure of produced copper powders were investigated in detail. Copper powders were characterized by X-Ray diffraction (XRD) and scanning electron micr...
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...
Effect of color and surfactants on nanofiltration for the recovery of carpet printing wastewaters
Capar, Goksen; Yetiş, Ülkü; Olceroglu, A. Hande; Yılmaz, Levent (Informa UK Limited, 2006-01-01)
Carpet printing wastewater (CPW) was spiked with metal-complex dyes at concentrations of 10 and 30 mg/L to investigate the effect of feed color on separation performance of nanofiltration (NF). The rejection was excellent; 98-100% for color and COD under all spiking conditions. Although the flux decline increased with increasing dye concentration, the concentration polarization was the main cause of the flux decline. The effect of surfactants on NF separation performance was also investigated by preparing s...
Citation Formats
G. Capar, Ü. Yetiş, and L. Yılmaz, “Most effective pre-treatment to nanofiltration for the recovery of print dyeing wastewaters,” DESALINATION, pp. 103–113, 2007, Accessed: 00, 2020. [Online]. Available: