American Society of Civil Engineers


Bioremediation of Mixed Wastes (BTEX, TPH, TCE, and cis-DCE) Contaminated Water


by Junhui Li, (Ph.D. Candidate, Dept. of Civil and Environmental Engineering, Univ. of Macau, Macau SAR, China.), Chengkeng Lei, (Master Student, Dept. of Civil and Environmental Engineering, Univ. of Macau, Macau SAR, China.), Shanshan Dong, (Bachelor Student. Dept. of Civil and Environmental Engineering, Univ. of Macau, Macau SAR, China.), and Hojae Shim, (corresponding author), (Associate Professor, Dept. of Civil and Environmental Engineering, University of Macau, Macau SAR, China E-mail: hjshim@umac.mo)

Journal of Hazardous, Toxic, and Radioactive Waste Management, Vol. 15, No. 3, July 2011, pp. 160-165, (doi:  http://dx.doi.org/10.1061/(ASCE)HZ.1944-8376.0000085)

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Document type: Journal Paper
Special Issue: Contaminant Mixtures: Fate, Transport, and Remediation
Abstract: Together with industrialization, more sites have become contaminated with mixed wastes of organics. Contamination of groundwater with benzene, toluene, ethylbenzene, and three isomers of xylene (BTEX) and chlorinated aliphatic hydrocarbons (CAHs) allows for the application of aerobic bioremediation to achieve mineralization of both types of compounds. In this study, the aerobic bioremoval of mixtures of these compounds [BTEX, BTEX/trichloroethylene (TCE), BTEX/cis-1,1-dichloroethylene (cis-DCE), BTEX/total petroleum hydrocarbons (TPH)/TCE, and toluene and ortho-xylene (ToX/TCE] was assessed under different environmental conditions (pH and temperature) by using indigenous microorganisms isolated from potentially contaminated regional sites. The highest TPH bioremoval efficiencies (<50%) occurred at 25°C and under neutral or alkaline conditions. TCE was cometabolized with toluene and o-xylene provided as growth substrates, and the highest bioremoval efficiency occurred at To X/ TCE, and pH and temperature impacted the mineralization of compounds. This study would help enhance the applicability of bioremediation technology to the mixed-wastes contaminated sites.


ASCE Subject Headings:
Environmental issues
Organic matter
Water pollution
Biological processes

Author Keywords:
Bioremoval
Environmental conditions
Interactions
Organic contaminants
Mixtures