The essential step to improve the coagulation efficiency is to select and optimize the pre-oxidation process.Ultraviolet/sodium percarbonate(UV/SPC)can be employed as an alternative system to UV/H_(2)O_(2) in drinking...The essential step to improve the coagulation efficiency is to select and optimize the pre-oxidation process.Ultraviolet/sodium percarbonate(UV/SPC)can be employed as an alternative system to UV/H_(2)O_(2) in drinking water treatment plant operation,benefiting from the solid stability properties with the equivalent effect.At present,the studies on UV/SPC,and other UV/advanced oxidation processes(UV/H_(2)O_(2),UV/persulfate,UV/chlorine,etc.),mostly focus on the advanced water treatment after filtration.This study notes that UV/SPC has advantages in the pre-oxidized organics.UV/SPC improving the effect of coagulation on dissolved organic carbon(DOC)elimination by up to 25%,the optimal UV dose and SPC dosage are 600 mJ/cm^(2) and 20 mg/L verified by a pilot experiment;the decomposition degree and conversion of organics which is most conducive to follow-up coagulation treatment is obtained through the detailed comparison of the influence range of UV dose or the CSPC on the molecule structure of organics;the disparate role of UV was unraveled in UV photolysis pre-oxidation and UV/SPC pre-oxidation and coagulation,including the influence regularity of UV transmittance(UVT)and processing flow rate on UV dose;confirm that UV/SPC alleviates the risk of the generation of disinfection byproducts(DBPs)to 51.15%.This study corroborates the potential of UV/SPC as a pre-oxidation technology at the application level.展开更多
The statistical process control techniques used in flexible manufacturing systems arestudied in this paper.Control charts which can be used in the low volume production are pro-posed.The automatic recognizer of unnatu...The statistical process control techniques used in flexible manufacturing systems arestudied in this paper.Control charts which can be used in the low volume production are pro-posed.The automatic recognizer of unnatural patterns for the control chart by using back-propagation neural network is also presented.展开更多
基金supported by the Integrated Management of Water Resources and Water Environment in the Yangtze River,Yellow River and Other Key Basins(No.2021YFC3201304)Beijing Water Group Research Institute(China)for its support.
文摘The essential step to improve the coagulation efficiency is to select and optimize the pre-oxidation process.Ultraviolet/sodium percarbonate(UV/SPC)can be employed as an alternative system to UV/H_(2)O_(2) in drinking water treatment plant operation,benefiting from the solid stability properties with the equivalent effect.At present,the studies on UV/SPC,and other UV/advanced oxidation processes(UV/H_(2)O_(2),UV/persulfate,UV/chlorine,etc.),mostly focus on the advanced water treatment after filtration.This study notes that UV/SPC has advantages in the pre-oxidized organics.UV/SPC improving the effect of coagulation on dissolved organic carbon(DOC)elimination by up to 25%,the optimal UV dose and SPC dosage are 600 mJ/cm^(2) and 20 mg/L verified by a pilot experiment;the decomposition degree and conversion of organics which is most conducive to follow-up coagulation treatment is obtained through the detailed comparison of the influence range of UV dose or the CSPC on the molecule structure of organics;the disparate role of UV was unraveled in UV photolysis pre-oxidation and UV/SPC pre-oxidation and coagulation,including the influence regularity of UV transmittance(UVT)and processing flow rate on UV dose;confirm that UV/SPC alleviates the risk of the generation of disinfection byproducts(DBPs)to 51.15%.This study corroborates the potential of UV/SPC as a pre-oxidation technology at the application level.
基金Supported bv the Commission of Science,Technology and Industry for National Defence of China.
文摘The statistical process control techniques used in flexible manufacturing systems arestudied in this paper.Control charts which can be used in the low volume production are pro-posed.The automatic recognizer of unnatural patterns for the control chart by using back-propagation neural network is also presented.
