The environmental pollution caused by psychotropic drugs harms human health and has prompted a stronger emphasis on research into water treatment measures.The UV/Chlorine-biological activated carbon(BAC)combined proce...The environmental pollution caused by psychotropic drugs harms human health and has prompted a stronger emphasis on research into water treatment measures.The UV/Chlorine-biological activated carbon(BAC)combined process was employed in this study to treat amitriptyline(AMT),a typical psychotropic drug,in slightly contaminated drinking water.The removal efficiency of AMT in drinking water by UV/Chlorine and the feasibility of combining it with BAC were determined.The results demonstrated that the removal efficiency of 1μmol/L AMT could reach 98.5% of the 2.0 mg/L chlorine and UV treated for 30 min.A significant removal improvement of AMT was 10%-45% compared to UV alone,Chlorine alone,and other oxidants combined,especially the SOUR(Specific Oxygen Uptake Rate),which was 57%-90% compared to other oxidants combined.Secondly,the optimal process parameters for UV/Chlorine-BAC treatment of slightly contaminated drinking water were a combination of UV exposure,chlorine dosage of 2 mg/L,and reaction times of i5 min followed by 30 min of BAC treatment.The AMT degradation,CODMn removal efficiency,and NO_(3)-N production was 88%,65%,and 95%,respectively.There was no significant effect on the number of microorganisms in the BAC medium,ensuring good long-term operation.Furthermore,an investigation was conducted to assess the influence of optimal process operation on the microbial community structure within BAC.This analysis unveiled a positive feedback loop in the colony architecture after implementing ideal process parameters.This study provides significant inspiration for addressing residual antidepressant issues using traditional drinking water treatment processes.展开更多
基金supported by the National Key R&DProgram of China(No.2023YFE0112100).
文摘The environmental pollution caused by psychotropic drugs harms human health and has prompted a stronger emphasis on research into water treatment measures.The UV/Chlorine-biological activated carbon(BAC)combined process was employed in this study to treat amitriptyline(AMT),a typical psychotropic drug,in slightly contaminated drinking water.The removal efficiency of AMT in drinking water by UV/Chlorine and the feasibility of combining it with BAC were determined.The results demonstrated that the removal efficiency of 1μmol/L AMT could reach 98.5% of the 2.0 mg/L chlorine and UV treated for 30 min.A significant removal improvement of AMT was 10%-45% compared to UV alone,Chlorine alone,and other oxidants combined,especially the SOUR(Specific Oxygen Uptake Rate),which was 57%-90% compared to other oxidants combined.Secondly,the optimal process parameters for UV/Chlorine-BAC treatment of slightly contaminated drinking water were a combination of UV exposure,chlorine dosage of 2 mg/L,and reaction times of i5 min followed by 30 min of BAC treatment.The AMT degradation,CODMn removal efficiency,and NO_(3)-N production was 88%,65%,and 95%,respectively.There was no significant effect on the number of microorganisms in the BAC medium,ensuring good long-term operation.Furthermore,an investigation was conducted to assess the influence of optimal process operation on the microbial community structure within BAC.This analysis unveiled a positive feedback loop in the colony architecture after implementing ideal process parameters.This study provides significant inspiration for addressing residual antidepressant issues using traditional drinking water treatment processes.
文摘该文探究了UV与过碳酸钠(SPC)均相高级氧化体系去除酸性橙7(AO7)的反应机理。结果表明:当AO7初始浓度为20 mg/L、SPC投加量为0.5 mmol/L时,光解25 min时AO7去除率可达98.4%,反应过程符合一级反应动力学模型,R^(2)>0.990。当pH约为3.0时,25 min AO7去除率为74.2%,当pH值提高至10.0左右时,体系去除效率提升至99.8%。高浓度无机阴离子HCO_(3)^(-)和NO_(3)^(-)均会对体系产生抑制,低浓度Cl-轻微促进,而SO_(4)^(2-)对反应速率几乎无影响。腐殖酸对AO7降解抑制相对较强,印染助剂柠檬酸钠对体系影响较小。自由基捕获实验和电子顺磁共振测试结果表明,UV/SPC体系中的活性物质为·OH、·CO_(3)^(-)、^(1)O_(2)和O_(2)^(•-),·OH为主要活性自由基。TOC结果表明,60 min TOC去除率为41.8%,具有比UV/H_(2)O_(2)更好的矿化效果。UV-Vis吸收光谱分析表明,16 min左右时主特征峰接近完全消失。依据液相色谱-质谱联用仪实验结果提出了AO7在UV/SPC高级氧化体系降解过程中的可能转化途径。
