焦化废水中有机物在A_1-A_2-O系统各段的降解与转化

Degradation and Transformation of Organics in Coke Plant Wastewater Treated with A1-A2-O Biofilm System

在厌氧酸化-缺氧-好氧(A1-A2-O)生物膜系统小试装置中处理焦化废水,以探讨有机物在各阶段的降解与转化情况。通过UV吸收光谱及GC/MS分析发现,上海焦化厂废水中的有机组分主要为:甲酚、苯酚、二甲酚等酚类化合物,及以喹啉、吲哚为代表的含氮杂环化合物,约占有机物总量的90％。经A1～A2-O生物膜系统处理后,大部分有毒有害难降解有机物得到了降解和转化。厌氧段中原有物质浓度的增加和新物质的生成,是厌氧酸化使部分有机物降解产生中间产物而造成;缺氧段使大部分有机物被完全降解或转化,还产生一些新的简单有机物,如卤代烃、酯类、醛类等;经好氧段反应后,有机物进一步降解和转化,部分被完全去除,在降解转化过程中又产生了一些中间产物和衍生物,如苯酚、羟基喹啉等。

A1-A2-O biofilm system was used to treat coke plant wastewater. Biodegradation and transformation of organic compounds in different stages have been studied.Through UV and GC/MS analysis, it was found that the dominant organic contaminants in wastewater from Shanghai Coke Plant were: methyl phenol, phenol, dimethylphenol and nitrogen-containing hetero-cyclic aromatic hydrocarbons, such as naphthalene and indol. They occupied a significant content of about 90% of total organic compounds. After treatment by using A1-A2-O biofilim system,a major part of toxic and refractory organic compounds had been degraded or transformed. In anaerobic stage,increasing concentration of original organics and generation of new organics were due to anaerobic acidification, In anoxic stage, most organics were totally degraded or transformed. Meanwhile,new small-molecular compounds were produced, such as esters, halogenated hydrocarbons and aldehydes, etc.. After reaction of aerobic stage,the remaining compounds were further degraded and transformed. Some of them were totally removed. New intermediate products and derivants like phenols and hydroxynaphthalene were generated.