Impact of solids on biphasic biodegradation of phenanthrene in the presence of hydroxypropyl-β-cyclodextrin(HPCD)  

作　　者：Zhenyi ZHANG Chihiro INOUE Guanghe LI 

机构地区：[1]Department of Environmental Sciences&Engineering,Tsinghua University,Beijing 100084,China [2]Graduate School of Environmental Studies,Tohoku University,Sendai 980-8579,Japan

出　　处：《Frontiers of Environmental Science & Engineering》2010年第3期329-333,共5页环境科学与工程前沿（英文）

摘　　要：The consequence of polycyclic aromatic hydrocarbons(PAHs)in the environment is of great concern.The hydrophobic properties of PAHs significantly impact phase distribution causing limited bioavailability.Enhanced biodegradation has been extensively carried out by surfactants and the redeployment effect was recognized.However,the quantitative relationship concerning the impact of solids was rarely reported.A batch of biphasic tests were carried out by introducing Mycobacterium vanbaalenii PYR-1 and hydroxypropyl-β-cyclodextrin(HPCD)into a mixture of phenanthrene solution and various glass beads(GB37-63,GB105-125,and GB350-500).The comparative results demonstrated that HPCD had little effect on microbial growth and was not degradable by bacterium.A model was proposed to describe the biodegradation process.The regression results indicated that the partition coefficient kd(1.234,0.726 and 0.448 L·g–1)and the degradation rate k(0 mmol·L^(–1):0.055,0.094,and 0.112;20 mmol·L^(–1):0.126,0.141,and 0.156;40 mmol·L^(–1):0.141,0.156 and 0.184 d^(–1))were positively and negatively correlated with the calculated total surface area(TSA)of solids,respectively.Degradation enhanced in the presence of HPCD,and the enhancing factor f was calculated(20 mmol·L^(–1):15.16,40.01,and 145.5;40 mmol·L^(–1):13.29,37.97,and 138.4),indicating that the impact of solids was significant for the enhancement of biodegradation.

关 键 词：biphasic biodegradation hydroxypropyl-β-cyclodextrin(HPCD) polycyclic aromatic hydrocarbons(PAHs) 

分 类 号：X53[环境科学与工程—环境工程]