曝气生物滤池处理采油废水过程中有机物的降解

在曝气生物滤池(BAF)系统中,按水力停留时间(HRT)4h,对盐度为0.5% (W/V)的采油废水进行处理,并利用GC-MS对废水中有机物的构成进行分析,结果表明:采油废水中有机污染物的主要构成是9种支链烷烃和18种直链烷烃,分布范围从正十三烷(C13H28)到正三十二烷(C32H66).由于降解中间产物的累积,出水中烷烃类物质所占比例降低,而芳香族物质比例上升.在采油废水中烷烃的存在下, PAHs中最易被微生物降解的是含有4个苯环、脂溶性强的,降解效率达98.0%;而降解效果最差的为含有二个苯环、脂溶性较差的萘,降解效率仅为66.4%.

DEGRADATION OF ORGANIC SUBSTANCES IN OIL FIELD WASTEWATER BY BIOLOGICAL AERATED FILTER

The experiments conducted under HRT=4h and salinity of 0.5%(W/V)show satisfactory treatment effects on oil field wastewater by biological aerated filter(BAF).Furthermore,the structures and degradation characteristics of organic substances in the wastewater were investigated using the GC-MS.The organic substances in influent are mainly composed of 9 kinds of branch-chain alkanes and 18 kinds of straight-chain alkanes ranged from tridecane(C13H28)to dotriacontane(C32H66).The intermediates accumulated in the degradation process results in the rise of aromatic substances in effluent.Because of the existence of alkanes,the degradation efficiency of chrysene with 4 benzene rings could be up to 98.0%;However,the efficiency of naphthalene with 2 benzene rings and poor fat-solubility was found low to 66.4%.