Comparison of bioremediation strategies for soil impacted with petrochemical oily sludge |
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| Affiliation: | 1. National Engineering Laboratory for Industrial Enzymes, Chinese Academy of Sciences, Tianjin 300308, China;2. Key Laboratory of Systems Microbial Biotechnology, Chinese Academy of Sciences, Tianjin 300308, China;3. Tianjin Institute of Industrial Biotechnology, Chinese Academy of Sciences, Tianjin 300308, China;4. Key Laboratory of Immune Microenvironment and Disease of the Ministry of Education, Tianjin Medical University, Tianjin 300070, China;1. Department of Chemical Engineering, Indian Institute of Technology Kharagpur, West Bengal 721302, India;2. School of Energy Science and Engineering, Indian Institute of Technology Kharagpur, West Bengal 721302, India;3. Biorefinery and Bioenergy Research Laboratory, Amity Institute of Biotechnology, Amity University Uttar Pradesh, Noida 201313, India;4. Department of Chemical Engineering, School of Engineering, Howard College, University of KwaZulu-Natal, Durban 4041, South Africa;5. Department of Biotechnology, Indian Institute of Technology Kharagpur, West Bengal 721302, India |
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| Abstract: | Different bioremediation techniques (natural attenuation, biostimulation and bioaugmentation) in contaminated soils with two oily sludge concentrations (1.5% and 6.0%) in open and closed microcosms systems were assessed during 90 days. The results showed that the highest biodegradation rates were obtained in contaminated soils with 6% in closed microcosms. Addition of microbial consortium and nutrients in different concentrations demonstrated higher biodegradation rate of total petroleum hydrocarbons (TPH) than those of the natural attenuation treatment. Soils treated in closed microcosms showed highest removal rate (84.1 ± 0.9%) when contaminated at 6% and bacterial consortium and nutrients in low amounts were added. In open microcosms, the soil contaminated at 6% using biostimulation with the highest amounts of nutrients (C:N:P of 100:10:1) presented the highest degradation rate (78.7 ± 1.3%). These results demonstrate that the application of microbial consortium and nutrients favored biodegradation of TPH present in oily sludge, indicating their potential applications for treatment of the soils impacted with this important hazardous waste. |
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| Keywords: | Bioaugmentation Biostimulation Bioremediation Oily sludge Soil landfarming |
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