Stabilisation/solidification and bioaugmentation treatment of petroleum drill cuttings |
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| Institution: | 1. Department of Agricultural & Environmental Engineering, Rivers State University of Science & Technology, P.M.B 5080, Port Harcourt, Nigeria;2. Mechanical Engineering Program, Texas A&M University at Qatar, P.O. Box 23874, Education City, Doha, Qatar;1. College of Chemistry and Chemical Engineering, Southwest Petroleum University, Chengdu 610500, PR China;2. Engineering Research Center of Oilfield Chemistry, Southwest Petroleum University, Ministry of Education, Chengdu 610500, PR China;1. State Key Laboratory of Heavy Oil Processing, China University of Petroleum (East China), Qingdao 266580, China;2. State Key Laboratory of Petroleum Pollution Control, Changping, 102206, Beijing, China;1. School of Materials Science and Engineering, Southwest University of Science and Technology, Mianyang 621010, Sichuan Province, People’s Republic of China;2. Chongqing Environmental Protection Center for Shale Gas Technology & Development, Fuling 400800, Chongqing, People’s Republic of China;3. Technology and Engineering Research Center of Biomass Materials, Ministry of Education, Southwest University of Science and Technology, Mianyang 621010, Sichuan Province, People’s Republic of China;4. Chongqing Environmental Protection Engineering Technology Center for Shale Gas Development, Fuling 408000, Chongqing, People’s Republic of China;1. Department of Construction Management, Louisiana State University, 214B Old Forestry Building, Baton Rouge, LA 70803, United States;2. Tran-SET University Transportation Center, Department of Construction Management, Louisiana State University, 3130 A PFT Hall, Baton Rouge, LA 70803, United States;3. Louisiana Transportation and Research Center, 4101 Gourrier Ave, Baton Rouge, LA 70808, United States |
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| Abstract: | Petroleum drill cuttings are usually treated by techniques suitable for particular contaminant groups. The significance of this study consists in the development of a treatment technology that can simultaneously handle the hydrocarbon and metal constituents of drill cuttings. Bioaugmentation is combined with stabilisation/solidification (S/S), within S/S monoliths and in granulated S/S monoliths. Portland cement was used for S/S treatment at 30% binder dosage. Bioaugmentation treatment involved two bacterial densities of a mixed culture bio-preparation. The effects of inclusion of compost, fertiliser and activated carbon were also evaluated. After 28 days, the combined S/S and bioaugmentation treatments recorded up to 15% higher total petroleum hydrocarbon (TPH) loss than control S/S treatment without bioaugmentation. Embedding fertiliser, activated carbon and higher bacterial density within S/S monoliths resulted in the highest (99%) TPH reduction but higher concentrations of metals. The addition of compost and lower bacterial density to granulated S/S monoliths led to similar (98%) TPH degradation and lower amounts of metals. The results suggest that with better mixture optimisation, combining S/S and bioaugmentation could engender more sustainable treatment of drill cuttings. |
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| Keywords: | Bioremediation Hydrocarbon utilising bacteria Metals Portland cement Stabilisation/solidification Total petroleum hydrocarbons |
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