生物活性炭滤池对水源水中邻苯二甲酸酯的降解性能

Degradation characteristics of phthalate acid esters in water by biological activated carbon filter

研究活性炭滤池在挂膜期间对水源水中4种微量PAEs的降解情况,以及挂膜成功后的生物活性炭滤池及改变运行条件如空床停留时间、4种PAEs的进水浓度、反冲洗膨胀度对降解4种PAEs的影响。结果表明:未挂膜时,活性炭滤池对DMP、DEP、DBP和DEHP的去除率为77.41%、82.40%、88.87%和96.17%,挂膜成功后,生物活性炭滤池对DMP、DEP和DBP的去除率分别增至99.3%、100%和95.27%,而对DEHP的去除率降为61.9%。当生物活性炭滤池成功启动并稳定运行后,15 min的空床停留时间下能够去除进水中94%以上的DMP、DEP、DBP以及74%以上的DEHP;如果持续提高进水中4种PAEs的浓度,滤池对其去除率会相应降低;当反冲洗时滤池膨胀度大小为20%,生物活性炭滤池对4种PAEs的去除率不仅能快速恢复正常水平,且能维持更长时间。

The degradation of four trace phthalate esters（ PAEs） in the water source was studied by activated carbon filter during the period of biofilm formation,and the effects of empty bed residence time（ EBCT）,initial PAEs concentration,and backwash swelling degree on the degradation were investigated,too. Results was showed that before hanging membrane,the removal rates of the dimethyl phthalate（ DMP）,diethyl phthalate（ DEP）,dibutyl phthalate（ DBP）,and diethylhexyl phthalate（ DEHP） were 77. 41%,82. 40%,88. 87%,and 96. 17%,respectively. Following successful biofilm formation,he removal rates of DMP,DEP,and DBP increased to 99. 3%,100%,and 95. 27%,except that of DEHP was reduced to 61. 9%. When biological activated carbon filter was operated stably,the removal rates of DMP,DEP and DBP were more than 94% and that of DEHP was exceeded 74% with 15 min-utes EBCT. The removal rates of PAEs were reduced with a continued increase in PAEs concentration in the in-fluent. When the degree of backwash swelling 9 was 20%,the removal of PAEs not only could be recovered rap-idly to normal levels,but also could be maintained for a longer period.