制革废水中铬的形态及其沉淀过程研究进展  

Study on the Speciation and Precipitation Process of the Chromium in Tannery Wastewater

作　　者：郝永永 马宏瑞 王晴 胡利珍 徐静 鄂涛 Hao Yongyong;Ma Hongrui;Wang Qing;Hu Lizhen;Xu Jing;E Tao(School of Environmental and Engineering,Shaanxi University of Science and Technology,Xi'an 710021,China)

机构地区：[1]陕西科技大学环境科学与工程学院,西安710021

出　　处：《化学工业与工程》2019年第1期48-58,共11页Chemical Industry and Engineering

基　　金：国家自然基金(21177079);国家水体污染控制与治理科技重大专项(2017ZX07602-001)

摘　　要：在制革过程中,有机络合态的铬是主鞣段和复鞣染色段废水中铬的主要赋存形态。在主鞣废水中,主要存在低分子有机酸及胶原水解产物的铬络合物,除了具有强稳定性的多元有机酸外,传统的蒙囿剂及胶原水解产物不会影响铬的碱沉淀去除效果。染整工段废水中的铬与该工段的各类皮革化学品形成络合物,其主要以水溶性、憎液溶胶以及颗粒物等多种形式存在,其中,水溶性铬-有机物络合物主要以阴离子型存在,通常的加碱沉淀法很难将其有效去除。系列研究表明,探索制革染整废水中水溶性阴离子铬配合物的去除是制革含铬废水脱铬的关键。In leather industry, chromium-organic is the main species of chromium in the effluent of main tanning section and retanning dyeing section. Chromium complexes of low molecular organic acids and collagen hydrolysis products dominate the chromium speciation in the main tanning wastewater. In addition to the highly stable multi-organic acids, conventional montmorillants and collagen hydrolysis products do not affect the removal of chromium by alkaline precipitation. The chromium in the waste water of dyeing and finishing section forms organic complexes with various leather chemicals and exists in various forms in this section, such as water-soluble, hydrophobic sol and particulates. Among them, water-soluble chromium-organic complex mainly exists in anionic form and is difficult to be removed effectively by alkaline precipitation. Our serial study indicates that the removal of water-soluble anionic chromium complex in leather dyeing and finishing wastewater is the key of chromium reduce in leather industry wastewater.

关 键 词：皮革生产 制革 含铬废水 铬络合物 

分 类 号：X794[环境科学与工程—环境工程]