管式电絮凝技术去除化工膜浓水硅污染物的研究

Research on the Removal of Silicon Pollutants from Chemical Membrane Concentrated Water by Using Tubular Electrocoagulation Technology

在硅污染物对膜系统的干扰阻碍零排放工艺进一步推行背景下,构建管式电絮凝平台,对化工膜浓水中硅污染物去除进行研究,试图找到解决该问题的科学方法。本文对两种化工膜浓水进行研究,对电絮凝装置的电流、废水的初始pH,水力停留时间,阳极类型进行了研究。结果表明:当电流从1 A增加至5 A时,硅的去除率从80.2%提升至90.9%;当pH从5提升到9时,硅污染物的去除效果逐渐增加,在pH=9时,效果最优,硅的去除率为89.6%;当HRT从15 min降低到5 min时,处理量提升3倍的条件下,硅的去除率仍为86.5%,抗冲击负荷能力强。在阳极类型探究时,发现铁阳极和铝阳极除硅效果均达到92.2%,效果优良。两种废水的处理能耗分别1.7 kWh/m^(3)和1.26 kWh/m^(3),均低于苏伊士工程手册推荐的2~4 kWh/m^(3),具有良好的节能优势。从以上结论可得,管式电絮凝技术有可能为零排工艺中硅污堵的问题提供科学的解决思路和方法。

In the context of the further implementation of zero discharge technology due to the interference of silicon pollutants in the membrane system,this article constructs a tubular electrocoagulation platform to study the removal of silicon pollutants from chemical membrane concentrated water,and attempts to find a scientific method to solve this problem.This article studies two types of chemical membrane concentrated water,including the current of the electrocoagulation device,initial pH of the wastewater,hydraulic retention time,and anode type.The results showed that when the current increases from 1 A to 5 A,the silicon removal rate increases from 80.2%to 90.9%.When the pH increases from 5 to 9,the removal effect of silicon pollutants gradually increases.At pH=9,the effect is optimal,with a silicon removal rate of 89.6%.When HRT was reduced from 15 minutes to 5 minutes,the removal rate of silicon was still 86.5%under the condition of a 3-fold increase in processing capacity,with strong impact load resistance.During the exploration of anode types,it was found that both iron and aluminum anodes achieved 92.2%silicon removal efficiency.The energy consumption for the treatment of two types of wastewater is 1.7 kWh/m^(3)and 1.26 kWh/m^(3),respectively.All are below the 2~4 kWh/m^(3)recommended by the Suez Engineering Manual,which have good energy-saving advantages.From the above conclusions,it can be concluded that tubular electrocoagulation technology may provide scientific solutions and methods for the problem of silicon pollution blockage in zero discharge processes.