Macquarie Dictionary define‘Risk’as the chance of an adverse event depending on the circumstances.In the field of engineering,the risk is often described as a specific unwanted event and including the consequences o...Macquarie Dictionary define‘Risk’as the chance of an adverse event depending on the circumstances.In the field of engineering,the risk is often described as a specific unwanted event and including the consequences or loss.Usually residual risk from civil engineering project would lead to serious effects.The control of residual risk is an important subject in modern civil engineering management research.In this paper,a residual risk controlling methods will be present.Firstly,the definition and other mentioned concepts will be introduced.It includes the definition of residual risk and other concepts of risk that are often confused.Next,basic ways of dealing risk will be mentioned.展开更多
The potential release capacity of arsenic(As)from sediment was evaluated under a high level of exogenous organic matter(EOM)with both bioreactive and chemically reactive organic matters(OMs).The OMs were characterized...The potential release capacity of arsenic(As)from sediment was evaluated under a high level of exogenous organic matter(EOM)with both bioreactive and chemically reactive organic matters(OMs).The OMs were characterized by FI,HIX,BIX,and SUVA254 fluorescence indices showing the biological activities were kept at a high level during the experimental period.At the genus level,Fe/Mn/As-reducing bacteria(Geobacter,Pseudomonas,Bacillus,and Clostridium)and bacteria(Paenibacillus,Acidovorax,Delftia,and Sphingomonas)that can participate in metabolic transformation using EOM were identified.The reducing condition occurs which promoted As,Fe,and Mn releases at very high concentrations of OM.However,As release increased during the first 15-20 days,followed by a decline contributed by secondary iron precipitation.The degree of As release may be limited by the reactivity of Fe(hydro)oxides.The EOM infiltration enhances As and Mn releases in aqueous conditions causing the risk of groundwater pollution,which could occur in specific sites such as landfills,petrochemical sites,and managed aquifer recharge projects.展开更多
文摘Macquarie Dictionary define‘Risk’as the chance of an adverse event depending on the circumstances.In the field of engineering,the risk is often described as a specific unwanted event and including the consequences or loss.Usually residual risk from civil engineering project would lead to serious effects.The control of residual risk is an important subject in modern civil engineering management research.In this paper,a residual risk controlling methods will be present.Firstly,the definition and other mentioned concepts will be introduced.It includes the definition of residual risk and other concepts of risk that are often confused.Next,basic ways of dealing risk will be mentioned.
基金supported by the National Key Research and Development Program(2019YFC1806204)the National Natural Science Foundation of China(No.41907178).
文摘The potential release capacity of arsenic(As)from sediment was evaluated under a high level of exogenous organic matter(EOM)with both bioreactive and chemically reactive organic matters(OMs).The OMs were characterized by FI,HIX,BIX,and SUVA254 fluorescence indices showing the biological activities were kept at a high level during the experimental period.At the genus level,Fe/Mn/As-reducing bacteria(Geobacter,Pseudomonas,Bacillus,and Clostridium)and bacteria(Paenibacillus,Acidovorax,Delftia,and Sphingomonas)that can participate in metabolic transformation using EOM were identified.The reducing condition occurs which promoted As,Fe,and Mn releases at very high concentrations of OM.However,As release increased during the first 15-20 days,followed by a decline contributed by secondary iron precipitation.The degree of As release may be limited by the reactivity of Fe(hydro)oxides.The EOM infiltration enhances As and Mn releases in aqueous conditions causing the risk of groundwater pollution,which could occur in specific sites such as landfills,petrochemical sites,and managed aquifer recharge projects.
