用表面活性剂提高生物滴滤床净化废气中氯苯的性能

A laboratory-scale trickling biofilter column,filled with Raschig rings and inoculated with Pseudomonas putida (ATCC 1785)was used to purify chlorobenzene contained waste gases.Sodium dodecyl sulfonate(SDS)was used to enhance the performance of trickling biofllter.Purification performance of the trickling biofilter was examined for chlorobenzene inlet concentration of 1.20～5.04 g/m~3 at different EBRTs between 76～153 s.Without SDS addition,with simultaneous increase in chlorobenzene inlet loading rate and gas flow rate,100% removal efficiency was achieved at EBRT of 109 s and inlet loadings below 5120 mg/m~3.Addition of SDS to nutrient solution led to improvement of trickling biofilter purification performance. By introducing 25 mg/L SDS,the removal efficiency was increased by 21% and elimination capacity up to 234 g/(m~3.h)was achieved at chlorobenzene inlet loading of 241 g/(m~3.h).Although SDS concentration experienced a low rate reduction after continuous nutrient solution recirculation,this result has little influence on trickling biofilter's removal efficiency in monitoring period.     

最暖的雪山

从丽江古城的柔软旖旎里出来,车行在弯弯绕绕的山路上,出古城大约45公里,便到了位于玉龙雪山东北山麓的牦牛坪。牦牛坪最美的季节在春夏,繁花似锦,长长的高原草甸上,星星点点缀着怒放的野花,流光溢彩。牦牛成群,安详地吃草散步,仿佛     

床前……

10月10日 晴 姥爷生病住院,放假闲来无事的我,在床前陪同。蓦地,发现姥爷竟苍老了许多,记忆便顺着时间的蔓藤回到了过去……     

暖床

生活中的某一个细节有时也能传递出许多信息,令人心生感动。外婆对“我”的关爱自然是体现在生活中的各个方面的．但其中的很多事情缺乏代表性,