印染废水生化出水高锰酸钾强化混凝深度处理溶解性有机物的去除特性  

Removal characteristic of dissolved organic matters in bio-treated effluents of dyeing and textile wastewater by potassium permanganate enhanced coagulation

作　　者：李暮[1] 孙贤波[1] 刘勇弟[1] 钱飞跃[1] 李欣珏[1] 李新[1] 

机构地区：[1]华东理工大学资源与环境工程学院,上海200237

出　　处：《环境化学》2012年第12期1878-1885,共8页Environmental Chemistry

基　　金：国家863计划重点项目课题资助(2009AA063904)资助

摘　　要：采用高锰酸钾预氧化,强化某印染废水生化出水铁盐混凝深度处理溶解性有机物(DOM),考察了高锰酸钾强化混凝对印染废水生化出水中DOM的去除特性并为优化混凝深度处理工艺提供理论参考.在最优投加条件下,高锰酸钾强化混凝处理提高了DOM色度的去除效果,以美国染料生产协会色度值(ADMI7.6)表征时为84%,出水ADMI7.6值较单独混凝处理降低了43%.但以溶解性有机碳(DOC)表征时去除率基本保持不变,为55%.通过XAD-8/XAD-4吸附树脂分离技术和分子量分布分析发现,高锰酸钾强化混凝处理通过有效去除疏水性和弱疏水性DOM色度降低了出水的色度.同时,出水中亲水性和小分子DOM(MW<1 kDa)较单独混凝处理分别增加了34%和15%,导致了DOM去除率以DOC表征时无显著改善.采用三维荧光光谱技术定性分析表明,引起色度的可见类富里酸和类腐殖酸物质被进一步去除使出水色度降低,此时出水中增多的小分子亲水性DOM主要为类蛋白质和富里酸物质.因此,高锰酸钾强化混凝处理过程仍需与其它能去除亲水性、小分子量DOM(MW<1 kDa)的处理工艺结合,以提高总体去除效率.In this paper, the effectiveness of potassium permanganate-enhanced coagulation process for dissolved organic matter （DOM） removal in the bio-effluent of dyeing and textile wastewater was investigated. The removal behaviors of DOM were characterized to support the optimization of coagulation treatment. Under the optimal dosing conditions, the color removal efficiency of potassium permanganate-enhanced coagulation treatment by the American Dyeing Manufactures Institute value （ADMIT.6 ） was improved to 84%, and the ADMI7.6 value of effluents after enhanced coagulation was 43% lower than that of ferric coagulation alone. However, the DOM removal of enhanced coagulation in term of DOC barely changed, about 55 % of DOC was eliminated. Compared with the treatment of ferric coagulation, the results of XAD-8/XAD-4 tandem resin fractionation and molecular weight （MW） distribution measurements demonstrated that the removal of large- MW hydrophobics and transphilics were improved after enhanced coagulation, which resulted in the decrease of effluent color. Moreover, the hydrophilics and low-MW （ 〈 1 kDa） organics in the effluent of enhanced coagulation were increased by 34% and 15%, respectively, which were the main reasons for no significant improvement of DOC removal obtained. emission matrix fluorescence spectroscopy further removed during enhanced coagula Qualitative analysis on DOM with three-dimensional excitation （3-DEEMs） indicated that fulvic-like and humic-like organics were tion process. Meanwhile, the increased low-MW hydrophilics were protein-like and fulvic-like organics dominantly. Potassium permanganate-enhanced coagulation needs to be combined with additional treatment steps that excel in removing the remaining DOM （mostly MW 〈 1 kDa, hydrophilics） to produce a high overall removal performance.

关 键 词：印染废水生化出水 溶解性有机物 强化混凝 高锰酸钾 

分 类 号：X791[环境科学与工程—环境工程]