厌氧-缺氧-预曝气-移动床生物膜系统对焦化废水特征有机污染物降解研究

Biodegradation of specific organic pollutants in coke plant wastewater by an anaerobic-anoxic-pre-aeration-moving bed biofilm reactor system

重点研究了厌氧-缺氧-预曝气-移动床生物膜(A1-A2-O-MBBR)组合工艺对焦化废水中特征有机污染物——苯酚、对甲酚、苯胺、邻甲酚、吲哚、喹啉和2,4-二甲酚的降解情况.结果发现,进水中苯酚、对甲酚、苯胺、邻甲酚、吲哚、喹啉和2,4-二甲酚的含量分别为48.68、25.53、11.70、8.46、8.02、5.33和1.26mg·mL-1,约占有机物总量的70.0%;经厌氧处理后,喹啉的去除率最高,达91.4%,苯酚和2,4-二甲酚的去除率为30.0%～40.0%,苯胺、邻甲酚、对甲酚和吲哚的去除率为20.0%～30.0%,并且厌氧出水的色度降低约55.0%;缺氧反硝化对有机物的降解或转化有重要作用,苯胺、喹啉和吲哚经缺氧处理后未检测到,苯酚、对甲酚和邻甲酚的去除率分别为93.3%、86.8%和81.7%,但2,4-二甲酚浓度却从0.13mg·mL-1增加到0.21mg·mL-1;而经预曝气处理后,苯酚、邻甲酚、对甲酚和2,4-二甲酚未检测到,MBBR反应器主要进行硝化反应,整个系统出水氨氮小于1.0mg·mL-1.

Constituents of specific organic pollutants（phenol,p-cresol,aniline,o-cresol,indole,quinoline and 2,4-dimethyl-phenol）in coke plant wastewater and their biodegradation by a combined anaerobic-anoxic-pre-aeration-moving bed biofilm reactor（A1-A2-O-MBBR）were studied.The contents of phenol,p-cresol,aniline,o-cresol,indole,quinoline and 2,4-dimethyl-phenol in the influent were 48.68,25.53,11.70,8.46,8.02,5.33 and 1.26 mg·L^-1,respectively,which accounted for 70.0% of the total organic compounds.After treatment by the anaerobic unit,quinoline had the highest removal rate,about 91.4%;the removal rates of phenol and 2,4-dimethyl-phenol were 30.0%-40.0%,and aniline,p-cresol,o-cresol and indole were 20.0%-30.0%.The color of the anaerobic effluent dropped about 55.0%.After anoxic denitrification treatment,aniline,quinoline and indole could not be detected,and the removal efficiencies of phenol,p-cresol and o-cresol were 93.3%,86.8% and 81.7%,respectively.However,the concentration of 2,4-dimethyl-phenol increased from 0.13 mg·L^-1 to 0.21 mg·L^-1.In the pre-aeration unit,phenol,p-cresol,o-cresol and 2,4-dimethyl-phenol were not detected.Most of the ammonia nitrogen could be removed in the MBBR,and the content of ammonia nitrogen in the effluent was less than 1.0 mg·L^-1.