Department of Civil Engineering, School of Infrastructure, Indian Institute of Technology Bhubaneswar, Orissa 751 013, India.
J Environ Manage. 2012 Jan;93(1):154-68. doi: 10.1016/j.jenvman.2011.09.012. Epub 2011 Oct 5.
Textile industry is one of the most chemically intensive industries on the earth and the major polluter of potable water. It generates huge quantities of complex chemical substances as a part of unused materials including dyes in the form of wastewater during various stages of textile processing. The direct discharge of this wastewater into environment affects its ecological status by causing various undesirable changes. As environmental protection becomes a global concern, industries are finding novel solutions for developing technologies that can diminish the environmental damage. However, colour removal from textile wastewater by means of cheaper and environmental friendly technologies is still a major challenge. In this manuscript, several options of decolourisation of textile wastewater by chemical means have been reviewed. Based on the present review, some novel pre-hydrolysed coagulants such as Polyaluminium chloride (PACl), Polyaluminium ferric chloride (PAFCl), Polyferrous sulphate (PFS) and Polyferric chloride (PFCl) have been found to be more effective and suggested for decolourisation of the textile wastewater. Moreover, use of natural coagulants for textile wastewater treatment has also been emphasised and encouraged as the viable alternative because of their eco-friendly nature.
纺织工业是地球上化学物质用量最多的行业之一，也是饮用水的主要污染源。它在纺织加工的各个阶段产生大量未使用的材料，包括染料，其中许多都是以废水的形式存在的复杂化学物质。这些废水直接排放到环境中，会通过引起各种不良变化而影响其生态状况。随着环境保护成为全球关注的焦点，各行业正在寻找新的解决方案，以开发可以减少环境破坏的技术。然而，用更便宜和环保的技术去除纺织废水中的颜色仍然是一个主要挑战。在本文中，综述了通过化学手段对纺织废水进行脱色的几种选择。根据目前的综述，一些新型的预水解混凝剂，如聚合氯化铝（PACl）、聚合氯化铁（PAFCl）、聚合硫酸铁（PFS）和聚合氯化铁（PFCl），已被发现更为有效，建议用于纺织废水的脱色。此外，还强调并鼓励使用天然混凝剂处理纺织废水，因为它们具有环保性质，是一种可行的替代方法。
