The effects of electrical heating and additives on the microbial remediation of petroleum-contaminated soils
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ORIGINAL PAPER
The effects of electrical heating and additives on the microbial remediation of petroleum‑contaminated soils Hongbai Jia1 · Yu Zhang2 · Guocai Zhang2 · Li Zou2 · Bowen Zhang3
Received: 5 September 2020 / Accepted: 29 September 2020 © Northeast Forestry University 2020
Abstract Although petroleum is an important source of energy and an economic driver of growth, it is also a major soil pollutant that has destroyed large swathes of vegetation and forest cover. Therefore, it is vital to develop affordable and efficient methods for the bioremediation of petroleumcontaminated forest soils to restore vegetation and improve tree survival rates. In this study, bioremediation experiments were performed in an electrically heated thermostatic reactor to test the effects of organic matter additives, surfactants, and oxygen providers of nine hydrocarbon-degrading fungal strains on crude oil removal rates. In the three soil temperatures tested (20 °C, 25 °C, and 30 °C), the highest average crude oil removal rate was at 25 °C (74.8%) and the lowest at 30 °C (49.4%). At each temperature, variations in the addition of organic matter and oxygen providers had significant Hongbai Jia and Yu Zhang contributed equally to this work. Project funding: This study was funded by the “948” project of The State Forestry Administration, “Microbial remediation of oil-polluted soil in Daqing Area” (2008-4-34); Special Fund project of basic Scientific Research operating Fee of Central Universities (2572014BA16). The online version is available at http://www.springerlink.com Corresponding editor: Yu Lei Electronic supplementary material The online version of this article (https://doi.org/10.1007/s11676-020-01237-0) contains supplementary material, which is available to authorized users.
effects on crude oil removal rate. Variations in surfactant addition was significant at 20 °C and 25 °C but insignificant at 30 °C. Given the same surfactant treatment, variations in temperature, organic additives, and oxygen providers was significant for crude oil removal rate. Treatments without surfactants and treatments with Tween80 exhibited their highest crude oil removal rates at 25 °C. However, treatments that included the SDS surfactant exhibited their highest crude oil removal rates at 30 °C. Amongst the treatments without surfactants, treatments with corn cob addition had the highest crude oil removal rates, and with surfactants, treatments that included the organic fertilizer exhibited the highest crude oil removal rates. Given the same organic fertilizer treatment, the highest crude oil removal rate was at 25 °C. At each level of oxygen availability, the maximum crude oil removal rate always occurred at 25 °C, and the treatments that included organic fertilizer exhibited the highest crude oil removal rates. Amongst the treatments without oxygen providers, treatments without surfactants had the highest crude oil removal rates, and with an oxygen provider, treatments with SDS addition exhibited the highest crude oil removal rates
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