焦化废水处理过程中溴代二口恶英类化合物的去除途径和生成机理  

Removal pathways and formation mechanism of ploybrominated dibenzo-p-dioxins and dibenzofurans in coking wastewater treatment processes

作　　者：蔡英[1,2] 任曼[1] 彭平安[1] 胡建芳[1] 陈德翼[1] 张万辉[1,2] 韦朝海[1,3] 

机构地区：[1]中国科学院广州地球化学研究所有机地球化学国家重点实验室,510640 [2]中国科学院大学,北京100049 [3]华南理工大学环境科学与工程学院,广州510006

出　　处：《科学通报》2013年第4期313-320,共8页Chinese Science Bulletin

基　　金：国家自然科学基金(41073083,40803028,21037001);国家科技支撑计划(2008BAC32B06-2)资助

摘　　要：用同位素稀释法-气相色谱/高分辨质谱测定了焦化废水处理过程中废水和污泥中的多溴代二苯并-对-二口恶英和多溴代二苯并呋喃(简称溴代二口恶英,PBDD/Fs)的浓度,并对其进行了质量平衡计算.结果表明,原水、出水、外排泥中8种2,3,7,8-PBDD/Fs的总量分别为1.94pg/L,0.28pg/L和2.24pg/gdw,对应的毒性当量浓度分别为0.77pgI-TEQ/L,0.14pgI-TEQ/L和0.46pgI-TEQ/gdw.采用两级高效厌氧生物流化床和内循环好氧生物三相流化床组成的A/O1/H/O2工艺能较好地去除2,3,7,8-PBDD/Fs,各组分的去除率介于75%～100%.去除的主要途径是吸附、沉淀到污泥中和除油池去除,2,3,7,8-PBDD/Fs总量的去除率分别是59%和39%.首次发现焦化废水处理过程的生物系统生成了一些2,3,7,8-PBDD/F单体,其主要组分为1,2,3,4,7,8/1,2,3,6,7,8-HxBDD.Concentrations of polybrominated dibenzo-p-dioxins and dibenzofurans （PBDD/Fs） in water and sludgy in the treatment processes of coking wastewater were determined with isotope dilution-high resolution gas chromatograph coupled with high resolution mass spectrometry. The mass balances of PBDD/Fs were calculated. The total concentration of eight 2,3,7,8-PBDD/Fs in raw coking wastewater, final effluent and sludge was respectively 1.94 pg/L, 0.28 pg/L, 2.24 pg/g dw, and the corresponding TEQ concentration was 0.77 pg I-TEQ/L, 0.14 pg I-TEQ/L, 0.46 pg I-TEQ/g dw, respectively. The Anoxic-oxic-hydrolytic-oxic （A/O1/H/O2） system coupled with biological fluidized bed could effectively remove 2,3,7,8-PBDD/Fs with the removal rates being in the range of 75%- 100%. 2,3,7,8-PBDD/Fs were removed mainly through adsorption and precipitate to sludge and removal of tar, accounting for 59% and 39% of the total concentration of 2,3,7,8-PBDD/Fs, respectively. It was interesting to find that several 2,3,7,8-PBDD/F congeners were formed in the biological system for the first time, and the main congeners were 1,2,3,4,7,8/1,2,3,6,7,8-HxBDD.

关 键 词：PBDD FS 焦化废水 物料平衡 生物合成 组分分布 

分 类 号：X784[环境科学与工程—环境工程]