腐殖质络合体系中水溶性铁的絮凝法去除

发布时间：2018-02-04 11:43

本文关键词： 络合体系除络合态铁六水氯化铝絮凝　出处：《环境工程学报》2016年12期 　论文类型：期刊论文

【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。
[Abstract]:In view of the humus complexation of iron in natural water and some wastewater, it is difficult to remove iron effectively by conventional chemical alkali precipitation. The effect of flocculation precipitation method with aluminum chloride as flocculant on the removal of water-soluble iron from simulated wastewater containing fulvic acid complex iron (FA-Fe) and landfill leachate was studied in this paper. The removal mechanism of water-soluble iron in fulvic acid complex system was preliminarily discussed. The results showed that the removal rate of water-soluble iron increased with the increase of aluminum chloride dosage in the treatment of simulated wastewater. With the increase of FA concentration in wastewater, the addition of humic acid (HA) can only promote the removal of free Fe3, and when pH is 8.0, the dosage of aluminum chloride is 1.0 g 路L ~ (-1)), the simulated wastewater containing 100mg 路L ~ (-1) (FA) and 10 mg 路L ~ (-1) Fe _ (3) is treated. The removal rate of water-soluble iron is up to 94.7g 路L ~ (-1). The removal rate of water-soluble iron is up to 95.1% when pH is 8.0, aluminum chloride dosage is 5.0 g 路L ~ (-1) ~ (-1), and appropriate amount of HA is added to landfill leachate, the removal rate of water-soluble iron is up to 95.1%. Aluminum salts improve the removal efficiency of water-soluble iron by forming insoluble polymers to adsorb FA-Fe.
【作者单位】：四川师范大学化学与材料科学学院;四川深蓝环保科技有限公司;四川省高校特种废水处理重点实验室;
【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)
【分类号】：X703
【正文快照】： 铁广泛存在于垃圾渗滤液中。垃圾渗滤液中含有大量的腐殖质,这种有机高分子物质容易与铁离子络合,生成复杂的有机络合态铁而溶于水,这种以络合态存在的铁不易去除,从而影响铁在环境中的迁移和转化[1-2]。络合态铁在生物法处理之后其有机组分被分解从而释放出铁离子,铁离子因核

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