粉煤灰处理印染废水的现状及分析

本文综述了粉煤友在印染废水中的应用。粉煤灰作为吸附剂可直接处理印染废水，处理效率较低，改性后粉煤灰可提高吸附性；利用粉煤灰的混凝作用对COD的去除率一般为50％-60％，色度去除率为80％左右；当粉煤灰与铁屑产生电化学作用时，用于印染废水预处理是行之有效的；作为印染废水助凝助沉剂，结合其他工艺，可使印染废水中COD和色度去除率分别达到90％和95％以上，并列举了粉煤灰处理印染废水成功的实例。但仍应加强理论研究，解决工程与设备问题是今后的工作方向。

Status Quo of Treating Printing and Dyeing Wastewater by Flyash

This paper reviewed the application of flyash in the treatment of printing and dyeing wastewater. When the flyash is used as a sorbem directly for treating printing and dyeing wastewater the efficiency is low, while the modified flyash has a higher adsorptivity. When coagulation of tlyash is applied the removal rates of COD and eolority of wastewater are 50% - 60% and 80% respectively. The flyash reacted electrochemically with scrap iron is available for treatment of the printing and dyeing wastewater. As a floeculation-settling agent, combining other process, the removal rates of COD and eolority for priming and dyeing wastewater could reach 90% and more than 95% respectively. Successful examples of treating priming and dyeing wastewater by flyash were presented. The study on mechanism should be strengthened to solve the problems of projects and equipments in future.