水力喷射空气旋流器用于含Cr（Ⅵ）废水处理

doi:10.3969/j.issn.0438-1157.2014.04.034

化工学报 ›› 2014, Vol. 65 ›› Issue (4): 1403-1410.DOI: 10.3969/j.issn.0438-1157.2014.04.034

水力喷射空气旋流器用于含Cr（Ⅵ）废水处理

程治良, 全学军, 代黎, 晏云鹏

重庆理工大学化学化工学院, 重庆 400054

收稿日期:2013-07-22 修回日期:2013-10-16 出版日期:2014-04-05 发布日期:2014-02-28
通讯作者: 全学军
作者简介:程治良（1986—），男，博士研究生。
基金资助:
国家自然科学基金项目（21176273）。

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

CHENG Zhiliang, QUAN Xuejun, DAI Li, YAN Yunpeng

College of Chemistry and Chemical Engineering, Chongqing University of Technology, Chongqing 400054, China

Received:2013-07-22 Revised:2013-10-16 Online:2014-04-05 Published:2014-02-28
Supported by:
supported by the National Natural Science Foundation of China (21176273).

摘要/Abstract

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。

关键词: 六价铬, 二氧化硫, 废水, 吸收, 还原, 气液两相流

Abstract: 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 min of cycling treatment by gas of SO₂ concentration 3582 mg·m^-3for the wastewater containing Cr(Ⅵ) 1134 mg·L^-1. Alkaline of wastewater 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 SO₂concentration 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.

Key words: hexavalent chromium, sulfur dioxide, waste water, absorption, reduction, gas-liquid flow

中图分类号:

TQ021.1

程治良, 全学军, 代黎, 晏云鹏. 水力喷射空气旋流器用于含Cr（Ⅵ）废水处理[J]. 化工学报, 2014, 65(4): 1403-1410.

CHENG Zhiliang, QUAN Xuejun, DAI Li, YAN Yunpeng. Treatment of Cr (Ⅵ)-containing wastewater in a water-sparged aerocyclone[J]. CIESC Journal, 2014, 65(4): 1403-1410.

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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

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