化工环保2024，Vol.44Issue(3)：377-383,7.DOI:10.3969/j.issn.1006-1878.2024.03.010
含没食子酸-Cr(Ⅲ)络合物废水中Cr(Ⅲ)的去除
Removal of Cr(Ⅲ)in gallic acid-Cr(Ⅲ)complex wastewater
摘要
Abstract
The removal effects of heavy metal traps of dithiocarbamate(DTC)and quaternary ammonium salt(QAS)on Cr(Ⅲ)were investigated by using the large molecule complex gallic acid(GA)-Cr(Ⅲ)and the small molecule complex citric acid(CA)-Cr(Ⅲ),and the influence of coagulation and precipitation,ultrasound treatment,and other auxiliary techniques on the removal effects of Cr(Ⅲ)in GA-Cr(Ⅲ)were compared.A suitable chromium removal process of"coagulation and precipitation-heavy metal trapping"was selected,and the effect of this process on the treatment of actual tannery wastewater was investigated.The results show that in the GA-Cr(Ⅲ)solution,Cr(Ⅲ)complexes with GA to form a large-molecule polymer,which wraps Cr(Ⅲ)inside the molecule,making it difficult for the heavy metal trap to play a role and leading to poor removal effect.After ultrasound treatment,the complex structure of GA-Cr(Ⅲ)is destroyed,which leads to the Cr(Ⅲ)wrapped up in the organic matter being exposed,thus facilitating the removal of Cr(Ⅲ)by the heavy metal trap.The removal effect of Cr(Ⅲ)is the best when coagulation and precipitation and heavy metal trap of DTC are used together,and the removal rate of Cr(Ⅲ)can reach 79.6%after GA-Cr(Ⅲ)solution is treated by this process.After the treatment of actual tannery wastewater by coagulation and precipitation and heavy metal trap of DTC/QAS,the effluent ρ(Cr)is lower than 1.5 mg/L,which meets the total chromium discharge limit in the Integrated Wastewater Discharge Standard(GB8978-1996).关键词
没食子酸-Cr(Ⅲ)/重金属捕集剂/超声/絮凝Key words
gallic acid-Cr(Ⅲ)/heavy metal remover/ultrasound/flocculation分类
资源环境引用本文复制引用
霍昉,马宏瑞,郝永永,李琴莲..含没食子酸-Cr(Ⅲ)络合物废水中Cr(Ⅲ)的去除[J].化工环保,2024,44(3):377-383,7.基金项目
国家自然科学基金项目(22076113). （22076113）
