化工学报2011，Vol.62Issue(7)：2033-2041,9.DOI:10.3969/j.issn.0438-1157.2011.07.037
结构态亚铁羟基化合物还原预处理印染废水的效果和机制
Reductive pretreatment of printing and dyeing wastewater by ferrous hydroxy complex
摘要
Abstract
Decolorization of printing & dyeing industry wastewater is a big challenge for wastewater treatment. In this study, ferrous hydroxy complex (FHC) was used to treat six types of simulation and industrial pollutant samples containing azo dye, and its reductive pretreatment mechanism and efficiency were studied. Influencing factors including morphology of ferrous iron, initial pH of wastewater, dosage of FHC, and molar ratio of Fe/OH- on the reductive transformation were also studied to examine FHC reactivity towards various azo dyes. The results show that the FHC is of higher reductive reactivity. More than 90％ of azo dyes could be removed when the dosage of FHC was 89.6 mg · L-1. The structure morphology of FHC has great influence on its reductive decolorization. Although both FHC and green rust are of high reduction reactivity, dissolved ferrous iron can not practically react with azo dyes. These results indicated that the structure and morphology of ferrous iron play an important role in decolorization of azo dyes. The decolorization performance is much higher for FHC than that for green rust. The molar ratio of ferrous iron to hydroxyl in FHC can impact its reactivity. The pH value has great influence on reduction of azo dyes by FHC, however, there is 4-10 of pH wide range in which high efficiency of dyes removal can be reached. Experiments for treating textile industrial wastewater showed that the removal of CODcr was up to 49％ and the BOD5/CODcr ratio increased from 0. 32 to 0. 62, as well as obvious decolorization was observed when dosage of ferrous iron was 120 mg · L-1 , all these indicated that the biodegradability of wastewater was improved significantly. Owing to FHC strong coagulation and reduction ability, it should be of potential for decolorization and biodegradability of textile wastewater.关键词
亚铁羟基化合物/还原脱色/偶氮染料/印染废水Key words
ferrous hydroxyl complex/ reductive decolorization/ azo dye/ printing and dyeing wastewater分类
资源环境引用本文复制引用
冯勇,吴德礼,马鲁铭..结构态亚铁羟基化合物还原预处理印染废水的效果和机制[J].化工学报,2011,62(7):2033-2041,9.基金项目
国家自然科学基金项目(50808136) （50808136）
国家高技术研究发展计划重点项目(2009AA063902). （2009AA063902）
