Kathon(CMI-MI),a mixture of 5-chloro-2-methyl-4-isothiazolin-3-one(CMI)and 2-methyl-4-isothiazolin-3-one(MI),was extensively used in industry as a nonoxidizing biocide or disinfectant.However,it would show adverse eff...Kathon(CMI-MI),a mixture of 5-chloro-2-methyl-4-isothiazolin-3-one(CMI)and 2-methyl-4-isothiazolin-3-one(MI),was extensively used in industry as a nonoxidizing biocide or disinfectant.However,it would show adverse effects on aquatic life when it is discharged into surface water.In this study,the removal performance,parameter influence,degradation products and enhancement of subsequent biodegradation of CMI-MI in UV/H_(2)O_(2)system were systematically investigated.The degradation rate of CMI-MI could reach 90%under UV irradiation for 20 min when the dosage of H_(2)O_(2)was 0.3 mmol·L^(–1).The DOC(dissolved organic carbon)mineralization rate of CMI-MI could reach 35%under certain conditions([H_(2)O_(2)]=0.3 mmol·L^(–1),UV irradiation for 40 min).kobs was inversely proportional to the concentration of CMI-MI and proportional to the concentration of H_(2)O_(2).The degradation rate of CMIMI was almost unchanged in the pH range from 4 to 10.Except the presence of CO_(3)^(2-)inhibited the removal rate of CMI-MI,SO_(4)^(2-),Cl^(-),NO_(3)^(-),and NH_(4)^(+) did not interfere with the degradation of CMI-MI in the system.It was found that UV/H_(2)O_(2)system had lower energy consumption and more economic advantage compared with UV/PS system by comparing the EEO(electric energy per order)values under the same conditions.Two main organic products were identified,namely HCOOH and CH_(3)NH_(2).There’s also the formation of Cl^(-)and SO_(4)^(2-).After UV and UV/H_(2)O_(2)photolysis,the biochemical properties of CMI-MI solution were obviously improved,especially the UV/H_(2)O_(2)treatment effect was better,indicating that UV/H_(2)O_(2)technology is expected to combine with biotechnology to remove CMI-MI effectively and environmentally friendly from wastewater.展开更多
通过对羧基丁腈胶乳微生物污染情况及防腐剂残留量的测试,发现在高温海运条件下,原用于胶乳中的防腐剂卡松(通常其活性成分氯甲基异噻唑啉酮与甲基异噻唑啉酮的质量比为3/1)容易失效,导致胶乳腐败变质。防腐剂活性物在50℃下的热储实验...通过对羧基丁腈胶乳微生物污染情况及防腐剂残留量的测试,发现在高温海运条件下,原用于胶乳中的防腐剂卡松(通常其活性成分氯甲基异噻唑啉酮与甲基异噻唑啉酮的质量比为3/1)容易失效,导致胶乳腐败变质。防腐剂活性物在50℃下的热储实验表明,甲基异噻唑啉酮在经历了初期的迅速降解后,在热储中保持稳定,降解率均值54.5%;氯甲基异噻唑啉酮在热储14 d内几乎完全降解。进而考察了含有甲基异噻唑啉酮的防腐剂Acticide M 10和Acticide M 10 S对羧基丁腈胶乳的防腐效果,结果显示,添加浓度为450×10^(-6)的防腐剂Actidice M 10的羧基丁腈胶乳,经过高温海运后仍有良好的防腐效果。展开更多
基金support of experimental Instrument Platform of Shandong Taihe Water Treatment Technology Co.,LTD.
文摘Kathon(CMI-MI),a mixture of 5-chloro-2-methyl-4-isothiazolin-3-one(CMI)and 2-methyl-4-isothiazolin-3-one(MI),was extensively used in industry as a nonoxidizing biocide or disinfectant.However,it would show adverse effects on aquatic life when it is discharged into surface water.In this study,the removal performance,parameter influence,degradation products and enhancement of subsequent biodegradation of CMI-MI in UV/H_(2)O_(2)system were systematically investigated.The degradation rate of CMI-MI could reach 90%under UV irradiation for 20 min when the dosage of H_(2)O_(2)was 0.3 mmol·L^(–1).The DOC(dissolved organic carbon)mineralization rate of CMI-MI could reach 35%under certain conditions([H_(2)O_(2)]=0.3 mmol·L^(–1),UV irradiation for 40 min).kobs was inversely proportional to the concentration of CMI-MI and proportional to the concentration of H_(2)O_(2).The degradation rate of CMIMI was almost unchanged in the pH range from 4 to 10.Except the presence of CO_(3)^(2-)inhibited the removal rate of CMI-MI,SO_(4)^(2-),Cl^(-),NO_(3)^(-),and NH_(4)^(+) did not interfere with the degradation of CMI-MI in the system.It was found that UV/H_(2)O_(2)system had lower energy consumption and more economic advantage compared with UV/PS system by comparing the EEO(electric energy per order)values under the same conditions.Two main organic products were identified,namely HCOOH and CH_(3)NH_(2).There’s also the formation of Cl^(-)and SO_(4)^(2-).After UV and UV/H_(2)O_(2)photolysis,the biochemical properties of CMI-MI solution were obviously improved,especially the UV/H_(2)O_(2)treatment effect was better,indicating that UV/H_(2)O_(2)technology is expected to combine with biotechnology to remove CMI-MI effectively and environmentally friendly from wastewater.
文摘通过对羧基丁腈胶乳微生物污染情况及防腐剂残留量的测试,发现在高温海运条件下,原用于胶乳中的防腐剂卡松(通常其活性成分氯甲基异噻唑啉酮与甲基异噻唑啉酮的质量比为3/1)容易失效,导致胶乳腐败变质。防腐剂活性物在50℃下的热储实验表明,甲基异噻唑啉酮在经历了初期的迅速降解后,在热储中保持稳定,降解率均值54.5%;氯甲基异噻唑啉酮在热储14 d内几乎完全降解。进而考察了含有甲基异噻唑啉酮的防腐剂Acticide M 10和Acticide M 10 S对羧基丁腈胶乳的防腐效果,结果显示,添加浓度为450×10^(-6)的防腐剂Actidice M 10的羧基丁腈胶乳,经过高温海运后仍有良好的防腐效果。
