Corrosion caused by sulfate-reducing prokaryotes(SRP)is an important cause of magnesium alloy anode failure in oil pipeline.In this study,the effects of Desulfovibrio sp.HQM3 on the corrosion behavior of AZ31B magnesi...Corrosion caused by sulfate-reducing prokaryotes(SRP)is an important cause of magnesium alloy anode failure in oil pipeline.In this study,the effects of Desulfovibrio sp.HQM3 on the corrosion behavior of AZ31B magnesium alloy anode in organic carbon sources with different contents in simulated tidal flat environment were analyzed using weight loss test,surface analysis and electrochemical analysis technologies.The results showed that the weight loss rate of coupons in low carbon sources contents(0%,1%,10%)was higher than that in 100%carbon sources.Electrochemical analyses showed that the corrosion current density(J_(corr))under low carbon sources contents was larger,while the charge transfer resistance(R_(ct))was lower,leading to a higher corrosion rate compared to those under 100%carbon sources content.Observations from scanning electron microscopy(SEM)and confocal laser scanning microscopy(CLSM)revealed more severe pitting corrosion on the alloy surface in the absence of carbon sources.In addition,a large number of nanowires were observed between bacteria on the alloy surface using SEM.Combined with thermodynamic calculations,it was demonstrated that the corrosion of coupons by Desulfovibrio sp.HQM3 in the absence of carbon sources was achieved through extracellular electron transfer.展开更多
The emission of hydrogen sulfide(H_(2)S)in sewers leads to pipeline corrosion and odor issues.Sulfate-reducing bacteria(SRB)reduce sulfate as the main pathway for H_(2)S production in wastewater.Inhibiting SRB activit...The emission of hydrogen sulfide(H_(2)S)in sewers leads to pipeline corrosion and odor issues.Sulfate-reducing bacteria(SRB)reduce sulfate as the main pathway for H_(2)S production in wastewater.Inhibiting SRB activity through chemical or biological methods is an effective strategy to reduce H_(2)S emissions.Therefore,the objective of this review is to provide a comprehensive summary of research in the reduction of H_(2)S production in sewer systems via inhibition of the metabolic activity of SRB.This study provides an understanding on the complex metabolism of SRB,which is crucial for mitigating H_(2)S generation in sewer systems.This review addresses H_(2)S production in sewer systems and its reduction methods by inhibiting SRB activity using both chemical and biological methods.Currently,the addition of chemicals to sewer systems to control H_(2)S has shown good effectiveness.However,these methods face challenges such as the need for repeated dosing,short effective durations,bacterial resistance,and increased loads on downstream wastewater treatment plants.Biological agents are more environmentally friendly,but research on their application for controlling H_(2)S in sewer systems is limited,and their effectiveness and stability are yet to be determined.This review analyses the potential of chemical and biological methods,discusses current applications and future research directions based on SRB inhibition mechanisms,and provides insights for developing more efficient and ecofriendly strategies for H_(2)S control in sewer systems.展开更多
基金Project(42076043) supported by the National Natural Science Foundation of ChinaProject(ZR2023ZD31) supported by the Major Basic Research Project of Natural Science Foundation of Shandong Province,ChinaProject(2023VEA0007) supported by the Chinese Academy of Sciences President’s International Fellowship Initiative。
文摘Corrosion caused by sulfate-reducing prokaryotes(SRP)is an important cause of magnesium alloy anode failure in oil pipeline.In this study,the effects of Desulfovibrio sp.HQM3 on the corrosion behavior of AZ31B magnesium alloy anode in organic carbon sources with different contents in simulated tidal flat environment were analyzed using weight loss test,surface analysis and electrochemical analysis technologies.The results showed that the weight loss rate of coupons in low carbon sources contents(0%,1%,10%)was higher than that in 100%carbon sources.Electrochemical analyses showed that the corrosion current density(J_(corr))under low carbon sources contents was larger,while the charge transfer resistance(R_(ct))was lower,leading to a higher corrosion rate compared to those under 100%carbon sources content.Observations from scanning electron microscopy(SEM)and confocal laser scanning microscopy(CLSM)revealed more severe pitting corrosion on the alloy surface in the absence of carbon sources.In addition,a large number of nanowires were observed between bacteria on the alloy surface using SEM.Combined with thermodynamic calculations,it was demonstrated that the corrosion of coupons by Desulfovibrio sp.HQM3 in the absence of carbon sources was achieved through extracellular electron transfer.
基金supported by the National Key R&D Program of China(No.2022YFC3702000).
文摘The emission of hydrogen sulfide(H_(2)S)in sewers leads to pipeline corrosion and odor issues.Sulfate-reducing bacteria(SRB)reduce sulfate as the main pathway for H_(2)S production in wastewater.Inhibiting SRB activity through chemical or biological methods is an effective strategy to reduce H_(2)S emissions.Therefore,the objective of this review is to provide a comprehensive summary of research in the reduction of H_(2)S production in sewer systems via inhibition of the metabolic activity of SRB.This study provides an understanding on the complex metabolism of SRB,which is crucial for mitigating H_(2)S generation in sewer systems.This review addresses H_(2)S production in sewer systems and its reduction methods by inhibiting SRB activity using both chemical and biological methods.Currently,the addition of chemicals to sewer systems to control H_(2)S has shown good effectiveness.However,these methods face challenges such as the need for repeated dosing,short effective durations,bacterial resistance,and increased loads on downstream wastewater treatment plants.Biological agents are more environmentally friendly,but research on their application for controlling H_(2)S in sewer systems is limited,and their effectiveness and stability are yet to be determined.This review analyses the potential of chemical and biological methods,discusses current applications and future research directions based on SRB inhibition mechanisms,and provides insights for developing more efficient and ecofriendly strategies for H_(2)S control in sewer systems.
