Technical and Economic Aspects of Reusing Textile Effluent as Process Water: A Case Study of Denim Washing Factory

M. Ahmad, Majed Alam Abir, M. Khan
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Abstract

Textile and apparel industries are the major role-players in the fast-growing economy of Bangladesh. However, the textile sector consumes a large amount of water for various wet processing operations. Currently 98% of the water used by local textile factories is groundwater, which is causing depletion of ground water levels at a high rate. Considering the gravity of groundwater crisis in future, Bangladesh Government and international brands and retailers are advocating local textile factories to reuse textile effluents and implement ZLD (zero liquid discharge) option in the upcoming years. However, it is a new concept for Bangladesh textile sector, and there is limited understanding regarding technical and economic issues associated to advanced treatment and reusing textile effluent. In this paper, a case study is presented to analyse the application of advanced membrane treatment of conventional ETP (effluent treatment plant) treated water of a denim washing factory. The corresponding technical and economic issues of water recycling and reusing were also analyzed. The selected denim washing factory runs a conventional biological effluent treatment plant (ETP) which satisfies the basic requirements of national and international standards. For advanced treatment, a mobile setup of ultrafiltration (UF) and reverse osmosis (RO) unit was used at factory premises to further treat ETP treated water. The advanced treatment was carried out for three different permeate to reject ratios to observe changes in the permeate and reject water quality. Capital expenditure and operational costs were also assessed to see the economic feasibility of the approach. This study will help local textile factories with real time data to understand the technical and economic issues associated to reusing textile wastewater as process water. Chemical Engineering Research Bulletin 21(2020) 127-132
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纺织废水回用工艺用水的技术经济分析——以牛仔布洗涤厂为例
纺织和服装业是孟加拉国快速增长的经济的主要角色。然而,纺织部门在各种湿加工操作中消耗大量的水。目前,当地纺织工厂使用的98%的水是地下水,这导致地下水位快速枯竭。考虑到未来地下水危机的严重性,孟加拉国政府和国际品牌和零售商正在倡导当地纺织工厂在未来几年内重新利用纺织废水并实施ZLD(零液体排放)方案。然而,对孟加拉国纺织部门来说,这是一个新概念,对与纺织废水的深度处理和再利用有关的技术和经济问题的了解有限。本文以某牛仔水洗厂为例,分析了高级膜法处理常规污水的应用情况。并对水循环回用的技术经济问题进行了分析。所选牛仔布洗涤厂运行常规生物污水处理厂(ETP),基本满足国家和国际标准要求。对于高级处理,工厂使用超滤(UF)和反渗透(RO)装置的移动装置进一步处理ETP处理过的水。对三种不同的渗透与截留比进行深度处理,观察渗透与截留水质的变化。资本支出和业务成本也进行了评估,以确定该方法的经济可行性。这项研究将帮助当地纺织工厂获得实时数据,了解与纺织废水作为工艺用水再利用相关的技术和经济问题。化工研究通报21(2020)127-132
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