Optimization of Aerobic Biodegradation of BTEX/CAHs Mixture in Soil via Response Surface Methodology
The effects of soil moisture, initial pH, temperature, and concentrations of chlorinated aliphatic hydrocarbons (CAHs) on the co-metabolic degradation of CAHs with benzene, toluene, ethylbenzene, and three isomers of xylene, collectively known as BTEX, provided as substrates by an indigenous aerobic microbial isolate was studied in lab-scale. The response surface methodology (RSM) was applied to design the experiments to evaluate the interactive effects of four factors: soil moisture (70%-150% of water holding capacity), pH (6.0-10.0), temperature (15-35℃), and CAHs concentration (0-10 mg/kg) on the co-metabolic degradation of CAHs with BTEX (400 mg/kg) provided as substrates. Based on the response surface and contour plots, the optimal conditions for degradation of CAHs and BTEX mixture were found soil moisture content >110% of the water holding capacity, pH between 8 and 9, and temperature between 15℃ and 20℃, while the CAHs concentration did not affect that much in the tested range. After 12 days of biodegradation, the highest biodegradation efficiencies of cis-dichloroethylene (DCE), benzene, trichloroethylene (TCE), toluene, ethylbenzene, m,p-xylene, and o-xylene were 27.0 %, 98.7%, 37.1%, 98.6%, 94.2%, 52.2%, and 46.5%, respectively. Results from this study would help enhance the applicability of biostimulation/bioaugmentation technology to the mixed wastes contaminated sites.
LI Junhui DONG Shanshan CHEN Yiqin SHIM Hojae
Department of Civil and Environmental Engineering, University of Macau, Macau SAR 999078, China
国际会议
2011 International Symposium on Environmental Science and Technology(2011 环境科学与技术国际会议 2011 ISEST)
广东东莞
英文
780-790
2011-06-01（万方平台首次上网日期，不代表论文的发表时间）