This paper is concerned about the application of glow discharge plasma for the remediation of petroleum pollution of the sea.We used diesel fuel as the processing target and conducted a series of lab-scale studies.Sev...This paper is concerned about the application of glow discharge plasma for the remediation of petroleum pollution of the sea.We used diesel fuel as the processing target and conducted a series of lab-scale studies.Several factors including the discharge voltage,gas flow rate,the concentration of NaCl,initial temperature,and initial concentration of diesel fuel can influence the performance of glow discharge plasma systems on removal efficiency of diesel fuel.To determine the optimal reaction conditions,the diesel degradation rate and energy efficiency were calculated.The experiment result for 2178 mg/L diesel fuel solution treatment was that removal efficiency of 93.3%was achieved after 12 min treatment with the energy yield of 17 g(kWh)^(−1).Higher voltage leads to larger removal efficiency,while the energy yield may be reduced.The removal efficiency of diesel fuel reached the maximum at the gas flow rate factor 700 mL/min,decreased with an increase in gas flow rate,and became a minimum value when the gas flow rate is 1000 mL/min as a result of the unstable discharge.Decreasing the concentration of sodium chloride can cause an increase in the removal efficiency of diesel fuel,because the conductivity tended to significantly increase the degradation efficiency.Moreover,temperature and initial concentration are demonstrated to have little influence on the rate constant,but higher initial concentration favors higher energy efficiency.During the remediation of diesel fuel,pH decreases to 2.76,while the conductivity of the solution and temperature are increased,especially for the temperature,which has an increase from 25℃ to 63℃.展开更多
In order to effectively control petroleum hydrocarbon pollution by immobilisation technology,it is necessary to understanding the degradation pathways of petroleum hydrocarbon in immobilised petroleum-degradation bact...In order to effectively control petroleum hydrocarbon pollution by immobilisation technology,it is necessary to understanding the degradation pathways of petroleum hydrocarbon in immobilised petroleum-degradation bacteria system.However,the adsorption in degradation process is rarely studied.In this study,adsorption process of petroleum hydrocarbon was synergistically studied by means of the surface properties,adsorption thermodynamics and molecular simulation.The results indicate that the immobilised petroleum-degradation bacteria have many holes for the bacteria to adsorb.The diesel adsorption by immobilised petroleum-degradation bacteria is a spontaneous,entropy-increasing and endothermic process.Diesel is first adsorbed to the surface of immobilised petroleum-degradation bacteria through hydrogen bonding,and then is biodegraded.This study provided substantial knowledge of immobilised technology in controlling petroleum hydrocarbon pollution.展开更多
Four microorganism strains were isolated from coastal petroleum-polluted soil and sand samples of Bohai Sea oilfield; they were found to degrade marine oil spills effectively. The experimental results show that the de...Four microorganism strains were isolated from coastal petroleum-polluted soil and sand samples of Bohai Sea oilfield; they were found to degrade marine oil spills effectively. The experimental results show that the degradation efficiency of crude oil with these four strains (XT-4, SZ-1-25, B-4-9, BS-3-12) is 95.97%, 96.01%, 97.99% and 98.99%, respectively, in their optimum conditions. The characteristics of bacterial biodegradation are investigated. The simulation biotreatment of oil-contaminated beach sand, with an initial oil content of 5,664mg/kg-dry-sand, shows that the residual oil content is 2,700 mg/kg-dry-sand and 2,679 mg/kg-dry-sand after 170 days' treatment with two bacteria (B-4-9, BS-3- 12), respectively.展开更多
基金The project is supported by the National Natural Science Foundation of China(61871409)。
文摘This paper is concerned about the application of glow discharge plasma for the remediation of petroleum pollution of the sea.We used diesel fuel as the processing target and conducted a series of lab-scale studies.Several factors including the discharge voltage,gas flow rate,the concentration of NaCl,initial temperature,and initial concentration of diesel fuel can influence the performance of glow discharge plasma systems on removal efficiency of diesel fuel.To determine the optimal reaction conditions,the diesel degradation rate and energy efficiency were calculated.The experiment result for 2178 mg/L diesel fuel solution treatment was that removal efficiency of 93.3%was achieved after 12 min treatment with the energy yield of 17 g(kWh)^(−1).Higher voltage leads to larger removal efficiency,while the energy yield may be reduced.The removal efficiency of diesel fuel reached the maximum at the gas flow rate factor 700 mL/min,decreased with an increase in gas flow rate,and became a minimum value when the gas flow rate is 1000 mL/min as a result of the unstable discharge.Decreasing the concentration of sodium chloride can cause an increase in the removal efficiency of diesel fuel,because the conductivity tended to significantly increase the degradation efficiency.Moreover,temperature and initial concentration are demonstrated to have little influence on the rate constant,but higher initial concentration favors higher energy efficiency.During the remediation of diesel fuel,pH decreases to 2.76,while the conductivity of the solution and temperature are increased,especially for the temperature,which has an increase from 25℃ to 63℃.
基金supported by the scientific research fund project of the National Natural Science Foundation of China(grant numbers 52070123 and 51874193)the Natural Science Foundation of Shandong Province(grant numbers ZR2020ME224)+4 种基金the National Key Research and Development Project(grant number 2019YFC0408503)the Science and Technology Projects of Qingdao(grant number 19-6-2-25-cg)Young Science and Technology Innovation Program of Shandong Province(grant number 2020KJD001)the Open Research Fund Program of Shandong Key Laboratory of Eco-Environmental Science for Yellow River Delta(Binzhou University)(grant number 2019KFJJ02)Project of Shandong Province Higher Educational Young Innovative Talent Introduction and Cultivation Team[Hydrogen energy chemistry innovation team]。
文摘In order to effectively control petroleum hydrocarbon pollution by immobilisation technology,it is necessary to understanding the degradation pathways of petroleum hydrocarbon in immobilised petroleum-degradation bacteria system.However,the adsorption in degradation process is rarely studied.In this study,adsorption process of petroleum hydrocarbon was synergistically studied by means of the surface properties,adsorption thermodynamics and molecular simulation.The results indicate that the immobilised petroleum-degradation bacteria have many holes for the bacteria to adsorb.The diesel adsorption by immobilised petroleum-degradation bacteria is a spontaneous,entropy-increasing and endothermic process.Diesel is first adsorbed to the surface of immobilised petroleum-degradation bacteria through hydrogen bonding,and then is biodegraded.This study provided substantial knowledge of immobilised technology in controlling petroleum hydrocarbon pollution.
基金This work was financially supported by the National Natural Science Foundation of China (No.40472152)
文摘Four microorganism strains were isolated from coastal petroleum-polluted soil and sand samples of Bohai Sea oilfield; they were found to degrade marine oil spills effectively. The experimental results show that the degradation efficiency of crude oil with these four strains (XT-4, SZ-1-25, B-4-9, BS-3-12) is 95.97%, 96.01%, 97.99% and 98.99%, respectively, in their optimum conditions. The characteristics of bacterial biodegradation are investigated. The simulation biotreatment of oil-contaminated beach sand, with an initial oil content of 5,664mg/kg-dry-sand, shows that the residual oil content is 2,700 mg/kg-dry-sand and 2,679 mg/kg-dry-sand after 170 days' treatment with two bacteria (B-4-9, BS-3- 12), respectively.