水力喷射空气旋流器用于含Cr(Ⅵ)废水处理  

Treatment of Cr(Ⅵ)-containing wastewater in a water-sparged aerocyclone

作　　者：程治良[1] 全学军[1] 代黎[1] 晏云鹏[1] 

机构地区：[1]重庆理工大学化学化工学院,重庆400054

出　　处：《化工学报》2014年第4期1403-1410,共8页CIESC Journal

基　　金：国家自然科学基金项目(21176273)~~

摘　　要：以SO2为还原剂,采用一种新型的气液传质设备——水力喷射空气旋流器(WSA)对含Cr(Ⅵ)废水进行直接还原处理,得到了比较满意的效果。研究结果表明:当SO2浓度为3582 mg·m-3时,对Cr(Ⅵ)含量为1134 mg·L-1的模拟含铬废水,循环处理6 min,Cr(Ⅵ)去除率可达99.9%以上。废水初始pH为碱性比其为酸性条件下,更有利于SO2的吸收,提高了SO2利用率,增强了处理效率。废水射流流速对处理效果的影响较小,但SO2和Cr(Ⅵ)的浓度对处理效果有明显影响。随着SO2浓度增大,处理效率增大;Cr(Ⅵ)的初始浓度增大,处理效率降低。研究结果为建立含硫气体还原处理含Cr(Ⅵ)废水新工艺提供了依据。A newly water-sparged aerocyclone （WSA） reactor was employed for treatment of Cr（Ⅵ）-containing wastewater by direct reduction using sulfur dioxide （SO2）, and a satisfactory result obtained. The results show that a removal efficiency above 99.9% of Cr（Ⅵ） is achieved after 6 rain of cycling treatment by gas of SO2 concentration 3582 mg . m-3 for the wastewater containing Cr（Ⅵ） 1134 mg . L-1. Alkaline ofwastewater is beneficial to absorb SO2, go up SO2 utility, and enhance the efficiency of Cr（Ⅵ） reduction. Initial concentrations of SO2 and Cr（VI） have significant influence on the efficiency of Cr（Ⅵ） removal, whereas the effect of wastewater jet velocity is less. The efficiency of Cr（Ⅵ） removal increase with increasing SO2 concentration and decrease with increasing initial Cr（Ⅵ） concentration. Comparing with the SO2 reduction process conducted in traditional gas-liquid reactors like packed towers, this reduction process in WSA has some obvious advantages, such as no need for adjusting pH of wastewater to 2-3 before SO2 reduction, easy operation and no Cr（OH）3 deposition in reactor. So, this investigation could be a basis for developing new reduction process using SO2 for treating Cr（Ⅵ）- containing wastewater.

关 键 词：六价铬 二氧化硫 废水 吸收 还原 气液两相流 

分 类 号：TQ021.1[化学工程]