腐殖质络合体系中水溶性铁的絮凝法去除  

Water-soluble iron removal from humus complex system using flocculation method

作　　者：唐吉丹 汪诗翔 周巍 刘美玲[1] 刘咏[1,3] 

机构地区：[1]四川师范大学化学与材料科学学院,成都610066 [2]四川深蓝环保科技有限公司,成都610066 [3]四川省高校特种废水处理重点实验室,成都610066

出　　处：《环境工程学报》2016年第12期7023-7029,共7页Chinese Journal of Environmental Engineering

基　　金：四川省教育厅重点项目(15ZA008);成都市科技局项目(2014-HM01-00211-SF);四川师范大学横向课题(02476905)

摘　　要：针对天然水体及一些废水中铁主要以腐殖质络合态存在,用常规化学碱沉淀法难以有效将其去除的问题,该文研究了以氯化铝为絮凝剂的絮凝沉淀法对含有富里酸络合态铁(FA-Fe)的模拟废水及垃圾渗滤液中水溶性铁的去除效果影响,初步探讨了铝盐对富里酸络合体系中水溶性铁的去除作用机理。结果表明:在处理模拟废水时,水溶性铁的去除率随氯化铝投加量的增加而增大,随废水中FA浓度的增加而减少,腐殖酸(HA)的加入仅对游离态Fe3+的去除有促进作用;在pH为8.0、氯化铝投加量为1.0 g·L^(-1)的条件下处理100 mg·L^(-1)FA和10 mg·L^(-1)Fe3+配成的模拟废水时,水溶性铁的去除率可达94.7%,比常规碱沉淀法提高了11.1%。在pH为8.0、氯化铝投加量为5.0 g·L^(-1)、适量投加HA的条件下处理垃圾渗滤液,水溶性铁的去除率最高可达95.1%。在絮凝过程中,铝盐主要通过形成不溶性聚合物吸附FA-Fe来提高水溶性铁的去除效率。In natural water and wastewater,Fe is normally bonded with humus. Therefore,the removal of iron from a humus complex system is difficult using conventional treatment technologies,such as alkaline precipitation. In this article,Al Cl3 was employed as flocculant to remove water-soluble iron from landfill leachate and fulvic acid complex iron（ FA-Fe） simulated wastewater. The FA-Fe removal mechanism by Al Cl3 was also investigated. The results showed three things. With Al Cl3 dosage of 1 g·L^-1,reaction pH of 8. 0,FA initial concentration of 100 mg·L^-1,and Fe（ Ⅲ） concentration of 10 mg·L^-1,94. 7% removal of water-soluble iron was obtained for the simulated wastewater. This was 11. 1% more than achieved using the alkaline precipitation treatment. Removal of water-soluble iron increased with increase in the Al Cl3 dosage,and decreased with increasing FA concentration. The use of humic acid（ HA） could effectively improve the free-state Fe3＋removal. The maximum water-soluble iron removal of 95. 1% was achieved at pH of 8. 0,and Al Cl3 dosage of 5 g·L^-1. During the coagulation process,the FA-Fe was removed due to the adsorption of insoluble aluminum polymer formed by the aluminum salts.

关 键 词：络合体系 除络合态铁 六水氯化铝 絮凝 

分 类 号：X703[环境科学与工程—环境工程]