The effects of Tween-20 and Zn(II)on ethylbenzene removal were evaluated using two biotrickling filters(BTFs),BTF1 and BTF2.Only BTF1 was fed with Tween-20 and Zn(II).Results show that ethylbenzene removal decreased from 94%to 69%for BTF1 and from 74%to 54%for BTF2 with increased organic loading from 64.8 to 189.0 g ethylbenzene/(m3·hr)at EBRT of 40 sec.The effect of EBRT(60–15 sec)at a constant ethylbenzene inlet concentration was more significant than that of EBRT(30–10 sec)at a constant organic loading.Biomass accumulation rate within packing media was reduced significantly.
Lu WangChunping YangYan ChengJian HuangHaining YangGuangming ZengLi LuShanying He
In this study,the performance of 3,5-dimethyl-2,4-dichlorophenol(DCMX) degradation by a screened strain was investigated.18 S r DNA and the neighbor-joining method were used for identification of the isolated strain.The results of phylogenetic analysis and scanning electron micrographs showed that the most probable identity of the screened strain should be Penicillium sp.Growth characteristics of Penicillium sp.and degradation processes of DCMX were examined.Fourier transform infrared spectroscopy of the inoculated DCMX solution was recorded,which supported the capacity of DCMX degradation by the screened Penicillium sp.Under different salinity conditions,the highest growth rate and removal efficiency for DCMX were obtained at p H 6.0.The removal efficiency decreased from 100%to 66% when the DCMX concentration increased from 5 to 60 mg/L,respectively.Using a Box–Behnken design,the maximum DCMX removal efficiency was determined to be 98.4%.With acclimation to salinity,higher removal efficiency could be achieved.The results demonstrate that the screened Penicillium sp.has the capability for degradation of DCMX.
Zhou YanHuijun HeChunping YangGuangming ZengLe LuoPanpan JiaoHuiru LiLi Lu
