Nano-TiO2 photocatalytic oxidation was used to perform the advanced treatment of biologically treated chemical comprehensive wastewater. The effects of reaction time,nano-TiO2 dosage and initial p H of the wastewater ...Nano-TiO2 photocatalytic oxidation was used to perform the advanced treatment of biologically treated chemical comprehensive wastewater. The effects of reaction time,nano-TiO2 dosage and initial p H of the wastewater on the removal rate of COD were tested. The GC/MS and EEM techniques were used to qualitatively analyze organic compounds in the wastewater before and after treatment. The result showed that after the biologically treated chemical comprehensive wastewater was treated by nano-TiO2 photocatalytic oxidation under the conditions of reaction time 3 h,nano-TiO2 dosage 8 g/L,and pH 8. 0,the effluent COD was 61. 9 mg/L and its removal rate was 63. 8%. Additionally,the species of organic pollutants reduced from 12 to 6. Meanwhile,the content of humic-like and fulvic-like substances dropped dramatically.展开更多
Municipal wastewater treatment plays an indispensable role in enhancing water quality by eliminating contaminants.While the process is vital,its environmental footprint,especially in terms of greenhouse gas(GHG)emissi...Municipal wastewater treatment plays an indispensable role in enhancing water quality by eliminating contaminants.While the process is vital,its environmental footprint,especially in terms of greenhouse gas(GHG)emissions,remains underexplored.Here we offer a comprehensive assessment of GHG emissions from wastewater treatment plants(WWTPs)across China.Our analyses reveal an estimated 1.54(0.92-2.65)×10^(4)Gg release of GHGs(CO_(2)-eq)in 2020,with a dominant contribution from N_(2)O emissions and electricity consumption.We can foresee a 60-65%reduction potential in GHG emissions with promising advancements in wastewater treatment,such as cutting-edge biological techniques,intelligent wastewater strategies,and a shift towards renewable energy sources.展开更多
文摘Nano-TiO2 photocatalytic oxidation was used to perform the advanced treatment of biologically treated chemical comprehensive wastewater. The effects of reaction time,nano-TiO2 dosage and initial p H of the wastewater on the removal rate of COD were tested. The GC/MS and EEM techniques were used to qualitatively analyze organic compounds in the wastewater before and after treatment. The result showed that after the biologically treated chemical comprehensive wastewater was treated by nano-TiO2 photocatalytic oxidation under the conditions of reaction time 3 h,nano-TiO2 dosage 8 g/L,and pH 8. 0,the effluent COD was 61. 9 mg/L and its removal rate was 63. 8%. Additionally,the species of organic pollutants reduced from 12 to 6. Meanwhile,the content of humic-like and fulvic-like substances dropped dramatically.
基金funded by the National Natural Science Foundation,China(No.42122059 and No.52000135)National Key Research and Development Program of China(No.2018YFE0106400)+1 种基金Natural Science Foundation of Tianjin(20JCYBJC01080)theWorld Bank through the Global Water Security&Sanitation Partnership.
文摘Municipal wastewater treatment plays an indispensable role in enhancing water quality by eliminating contaminants.While the process is vital,its environmental footprint,especially in terms of greenhouse gas(GHG)emissions,remains underexplored.Here we offer a comprehensive assessment of GHG emissions from wastewater treatment plants(WWTPs)across China.Our analyses reveal an estimated 1.54(0.92-2.65)×10^(4)Gg release of GHGs(CO_(2)-eq)in 2020,with a dominant contribution from N_(2)O emissions and electricity consumption.We can foresee a 60-65%reduction potential in GHG emissions with promising advancements in wastewater treatment,such as cutting-edge biological techniques,intelligent wastewater strategies,and a shift towards renewable energy sources.
