The effects of different chemical oxygen demand(COD)concentrations on the anammox granular sludge with Bamboo Charcoal(BC)addition were evaluated in UASB reactor.The results showed that the average total nitrogen(TN)r...The effects of different chemical oxygen demand(COD)concentrations on the anammox granular sludge with Bamboo Charcoal(BC)addition were evaluated in UASB reactor.The results showed that the average total nitrogen(TN)removal efficiency was reduced from 85.9%to 81.4%when COD concentration was increased from 50 to 150 mg/L.However,the TN removal efficiency of BC addition reactors was dramatically 3.1%-6.4%higher than that without BC under different COD concentrations.The average diameter of granular sludge was 0.13 mm higher than that without BC.The settling velocity was increased by elevated COD concentration,while the EPS and VSS/SS were increased with BC addition.The high-throughput Miseq sequencing analyses revealed that the bacterial diversity and richness were decreased under COD addition,and the Planctomycetes related to anammox bacteria were Candidatus Brocadia and Candidatus Kuenenia.The Metagenomic sequencing indicated that the abundance of denitrification related functional genes all increased with elevated COD,while the abundance of anammox related functional genes of decreased.The func-tional genes related to anammox was hydrazine synthase encoding genes(hzsA,hzsB and hzsB).The average relative abundance of hzs genes in the reactor with BC addition was higher than the control at COD concentrations of 50 mg/L and 150 mg/L.The functional genes of denitrification mediated by BC were higher than those without BC throughout the operation phase.It is interesting to note that BC addition greatly enriched the related func-tional genes of denitrification and anammox.展开更多
Acetonitrile inorganic salt aqueous two-phase extraction method was established for the determination of triazine herbicides(simeton,cyanazine,desmetryn,terbumeton,terbuthylazine and dimethametryn)in environmental wat...Acetonitrile inorganic salt aqueous two-phase extraction method was established for the determination of triazine herbicides(simeton,cyanazine,desmetryn,terbumeton,terbuthylazine and dimethametryn)in environmental water samples by high-performance liquid chromatography(HPLC).The extraction solvents types and volume of acetonitrile,the inorganic salt types and amount of(NH_(4))_(2)SO_(4),extraction time and pH of sample solution were optimized by single-factor experiment and central composite design.Under the optimum extraction conditions,all linear ranges were obtained with coefficients of determination(r)≥0.9993.The limits of detection for this proposed method were in the range of 0.16-0.28μg/L for six triazine herbicides.The developed method has been successfully applied to the analysis of target triazine herbicides from lake,canal and moat in real-world water samples.The recoveries of target analytes were in the range from 87.0 to 110.9%and the relative standard deviation was lower than 7.3%.展开更多
Recently,the degradation of organic compounds in saline dye wastewater by sulfate radicals(SO4·-)-based advanced oxidation processes(AOPs) have attracted much attention.However,previous studies on these systems h...Recently,the degradation of organic compounds in saline dye wastewater by sulfate radicals(SO4·-)-based advanced oxidation processes(AOPs) have attracted much attention.However,previous studies on these systems have selected non-chlorinated dyes as model compounds,and little is known about the transformation of chlorinated dyes in such systems.In this study,acid yellow 17(AY-17) was selected as a model of chlorinated contaminants,and the degradation kinetics and evolution of oxidation byproducts were investigated in the UV/PDS system.AY-17 can be efficiently degraded(over 98% decolorization)under 90 min irradiation at pH 2.0-3.0,and the reaction follows pseudo-first order kinetics.Cl-accelerated the degradation of AY-17,but simultaneously led to an undesirable increase of absorbable organic halogen(AOX).Several chlorinated byproducts were identified by liquid chromatography-mass spectrometry(LC-MS/MS) in the UV/PDS system.It indicates that endogenic chlorine and exogenic Cl-reacted with SO_(4)·- to form chloride radicals,which are involved in the dechlorination and rechlorination of AY-17 and intermediates.The possible degradation mechanisms of AY-17 photooxidative degradation are proposed.This work provides valuable information for further studies on the role of exogenic chloride in the degradation of chlorinated azo dyes and the kinetic parameters in the PDS-based oxidation process.展开更多
基金supported by the China Postdoctoral Science Foundation (No. 2020M671400)the Natural Science Foundation of Jiangsu Province (No. BK20201450)+3 种基金the Jiangsu Qing Lan ProjectSuzhou Science and Technology Planning Project (Nos.SS202016 and SS2019022)the Opening Fund of Jiangsu Provincial Key Laboratory of Environmental Science and Engineering(No. Zd1804)the Graduate Research Innovation Program of Jiangsu Province (No. KYCX19_2030)
文摘The effects of different chemical oxygen demand(COD)concentrations on the anammox granular sludge with Bamboo Charcoal(BC)addition were evaluated in UASB reactor.The results showed that the average total nitrogen(TN)removal efficiency was reduced from 85.9%to 81.4%when COD concentration was increased from 50 to 150 mg/L.However,the TN removal efficiency of BC addition reactors was dramatically 3.1%-6.4%higher than that without BC under different COD concentrations.The average diameter of granular sludge was 0.13 mm higher than that without BC.The settling velocity was increased by elevated COD concentration,while the EPS and VSS/SS were increased with BC addition.The high-throughput Miseq sequencing analyses revealed that the bacterial diversity and richness were decreased under COD addition,and the Planctomycetes related to anammox bacteria were Candidatus Brocadia and Candidatus Kuenenia.The Metagenomic sequencing indicated that the abundance of denitrification related functional genes all increased with elevated COD,while the abundance of anammox related functional genes of decreased.The func-tional genes related to anammox was hydrazine synthase encoding genes(hzsA,hzsB and hzsB).The average relative abundance of hzs genes in the reactor with BC addition was higher than the control at COD concentrations of 50 mg/L and 150 mg/L.The functional genes of denitrification mediated by BC were higher than those without BC throughout the operation phase.It is interesting to note that BC addition greatly enriched the related func-tional genes of denitrification and anammox.
基金the major project of Natural Science Foundation of Jiangsu Higher Education Institutions of China(no:15KJA610003)Natural Science Foundation of Jiangsu Province(no.BK20160359)Natural Science and Technology Program on Water Pollution Control and Treatment(2017ZX07205-2).
文摘Acetonitrile inorganic salt aqueous two-phase extraction method was established for the determination of triazine herbicides(simeton,cyanazine,desmetryn,terbumeton,terbuthylazine and dimethametryn)in environmental water samples by high-performance liquid chromatography(HPLC).The extraction solvents types and volume of acetonitrile,the inorganic salt types and amount of(NH_(4))_(2)SO_(4),extraction time and pH of sample solution were optimized by single-factor experiment and central composite design.Under the optimum extraction conditions,all linear ranges were obtained with coefficients of determination(r)≥0.9993.The limits of detection for this proposed method were in the range of 0.16-0.28μg/L for six triazine herbicides.The developed method has been successfully applied to the analysis of target triazine herbicides from lake,canal and moat in real-world water samples.The recoveries of target analytes were in the range from 87.0 to 110.9%and the relative standard deviation was lower than 7.3%.
基金supported by National Key Research Development Program of China (No.2019YFC0408304)the National Natural Science Foundation of China (No.21677031)+1 种基金the Jiangsu Provincial Key Laboratory of Environmental Science and Engineering (No.Zd1901)Ningbo Natural Science Foundation (No.202003N4135)。
文摘Recently,the degradation of organic compounds in saline dye wastewater by sulfate radicals(SO4·-)-based advanced oxidation processes(AOPs) have attracted much attention.However,previous studies on these systems have selected non-chlorinated dyes as model compounds,and little is known about the transformation of chlorinated dyes in such systems.In this study,acid yellow 17(AY-17) was selected as a model of chlorinated contaminants,and the degradation kinetics and evolution of oxidation byproducts were investigated in the UV/PDS system.AY-17 can be efficiently degraded(over 98% decolorization)under 90 min irradiation at pH 2.0-3.0,and the reaction follows pseudo-first order kinetics.Cl-accelerated the degradation of AY-17,but simultaneously led to an undesirable increase of absorbable organic halogen(AOX).Several chlorinated byproducts were identified by liquid chromatography-mass spectrometry(LC-MS/MS) in the UV/PDS system.It indicates that endogenic chlorine and exogenic Cl-reacted with SO_(4)·- to form chloride radicals,which are involved in the dechlorination and rechlorination of AY-17 and intermediates.The possible degradation mechanisms of AY-17 photooxidative degradation are proposed.This work provides valuable information for further studies on the role of exogenic chloride in the degradation of chlorinated azo dyes and the kinetic parameters in the PDS-based oxidation process.
