摘要
采用中空纤维膜生物反应器(HFMB)去除气态二甲苯,研究比较了不同进口浓度、停留时间以及悬浮液中生物量对二甲苯净化效果的影响。实验结果表明:随着进口浓度的增加二甲苯净化效率先升高后平稳,生化降解能力(EC)则明显升高;随着停留时间的增加,二甲苯的净化效率明显增加。实验发现最佳的实验条件是:悬浮液循环速率50 L/h,pH值介于6.5到7.5之间,溶解氧6 mg/L左右,停留时间tR=8.8 s;二甲苯的处理效率可达到92%以上。结果还显示二甲苯净化效率随悬浮液循环流速的变化而波动不大,进口二甲苯的组成对净化效率也有一定的影响。与传统的生物法相比,膜生物反应器可以实现气相和液相的分离以及减少占地面积,具有很好的发展前景。
The hollow fiber membrane bioreactor（HFMBR） was studied to remove gaseous xylene.The impacts of inlet concentration,residence time and the biomass on xylene removal were studied and compared.Results indicated that xylene removal efficiency increased first and then stabled off while elimination capacity（EC） increased greatly when the inlet concentration increased.When the retention time was larger,the xylene removal rate became larger.The optimal performance conditions were found to be： recycle rate of suspension liquor 50 L/h,pH value 6.5～7.5,DO 6 mg/L,retention time tR=8.8 s.The highest xylene removal efficiency can reach more than 92%.The results also showed that xylene removal efficiency changed little with the recycle rate of liquor and the composition of inlet xylene would impair the total removal efficiency. Compared with conventional biofilter,membrane bioreactor was a prospective technique because it made it possible that liquid phase was separated from gas-phase,and then it could lower the land use.
出处
《环境工程学报》
CAS
CSCD
北大核心
2010年第10期2287-2292,共6页
Chinese Journal of Environmental Engineering
基金
国家"十一五"科技支撑计划(2006BAK20B01-5)
上海市重点学科资助(B506)
