Recovery of Water from Textile Dyeing Using Membrane Filtration Processes

Joanna Marszałek,Renata Żyłła

doi:10.3390/pr9101833

Abstract

The aim of the work was to purify model textile wastewater (MTW) using a two-stage membrane filtration process comprising nanofiltration (NF) and reverse osmosis (RO). For this purpose, a nanofiltration membrane TFC-SR3 (KOCH) and reverse osmosis membrane AG (GE Osmonics) were used. Each model wastewater contained a selected surfactant. The greatest decrease in flux in the initial phase of the process occurred for the detergents based on fatty-acid condensation products. An evident decrease in performance was observed with polysiloxane-based surfactants. No fouling effect and high flux values were observed for the wastewater containing a nonionic surfactant based on fatty alcohol ethoxylates. During RO, a significantly higher flux and lower resistance were observed for the feed that originally contained the anionic agent. For the MTW containing the nonionic surfactant, the conductivity reduction ranged from 84% to 92% depending on the concentrate ratio at the consecutive stages of RO. After treatment, the purified wastewater was reused in the process of dyeing cellulose fibers with reactive dyes. The research confirmed that textiles dyed with the use of RO filtrates did not differ in quality of dyeing from those dyed in pure deionized water.

Highlights

The textile industry is one of the most demanding in terms of water consumption [1,2].Despite the fact that it uses less and less water, the problem of wastewater is still a matter of concern
This paper describes the entire cycle of water reuse for dyeing of cellulose textiles and shows the experimental results concerning the quality of cellulose fiber samples dyed in wastewater treated with two-stage membrane filtration
Model textile wastewater (MTW) was purified using two membrane filtration processes arranged in series, i.e., nanofiltration (NF) and reverse osmosis (RO)

Summary

Introduction

The textile industry is one of the most demanding in terms of water consumption [1,2].Despite the fact that it uses less and less water, the problem of wastewater is still a matter of concern. The textile industry is one of the most demanding in terms of water consumption [1,2]. The volume of water consumed by a textile plant may vary from 100,000 to 300,000 m3 per year. As textiles satisfy a significant part of human needs, it is estimated that, in 2050, the total supply of clothing will reach 160 million metric tons, which is three times more than today. This will significantly the increase the negative environmental impact of the textile industry. The consumption of water and energy, as well as the amount of pollutants discharged with wastewater, will grow

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