Investigations on Ozone-Based and UV/US-Assisted Synergistic Digestion Methods for the Determination of Total Dissolved Nitrogen in Waters

Over the past two decades, the alkaline persulfate oxidation (PO) with thermal and/or ultraviolet (UV) assisted digestion method has been widely used for digestion of nitrogen containing compounds (N-compounds) in water quality routine analysis in laboratory or on-line analysis, due to its simple principle, high conversion rate, high percent recovery, low-cost. However, this digestion method still has some inevitable problems such as complex operations, high contamination potential, batch N blanks, higher reaction temperature (120–124 °C) and time-consuming (30–60 min). In this study, ozone (O<sub<3</sub<) was selected as the oxidant for digestion of N-compounds through analysis and comparison firstly. Secondly, we proposed and compared the UV and/or ultrasound (US) combined with ozone (UV/O<sub<3</sub<, US/O<sub<3</sub< and UV/US/O<sub<3</sub<) synergistic digestion methods based on O<sub<3</sub< with sole O<sub<3</sub< oxidation method on digestion efficiency (digestion time and conversion rate) of standard N-compounds. Simultaneously, the influence of reaction temperature, pH of water sample, concentration of O<sub<3</sub< and mass flow rate, UV intensity, US frequency and power on digestion efficiency were investigated, and then the optimum parameters for digestion system were obtained. Experimental results indicated that UV radiation can effectively induce and promote the decomposition and photolysis of O<sub<3</sub< in water to generate hydroxyl radicals (•OH), while US can promote the diffusion and dissolution of O<sub<3</sub< in water and intensify the gas-liquid mass transfer process for the reaction system. Meanwhile, results showed that the UV/US/O<sub<3</sub< synergistic digestion method had the best digestion efficiency under the optimum conditions: water sample volume, 10 mL; pH of water sample, 11; O<sub<3</sub< mass flow rate, 3200 mg/h; reaction temperature, 30 °C; digestion time, 25 min; UV lamp power, 18 W; distance between UV lamp and reactor, 2 cm; US frequency, 20 kHz; US power, 75 W. The conversion rate (CR) of synthetic wastewater samples varied from 99.6% to 101.4% for total dissolved nitrogen (TDN) in the range of 1.0~4.0 mg/L. The UV/US/O<sub<3</sub< synergistic digestion method would be an effective and potential alternative for digestion of N-compounds in water quality routine analysis in laboratory or on-line analysis. Ausführliche Beschreibung

Gespeichert in:

Autor*in:	Xiaofang Sun [verfasserIn] Huixuan Chen [verfasserIn] Zhengyu Liu [verfasserIn] Mengfei Zhou [verfasserIn] Yijun Cai [verfasserIn] Haitian Pan [verfasserIn] Luyue Xia [verfasserIn]

Format:	E-Artikel
Sprache:	Englisch

Erschienen:	2020

Schlagwörter:	total dissolved nitrogen digestion method digestion efficiency intensification ozone

Übergeordnetes Werk:	In: Processes - MDPI AG, 2013, 8(2020), 490, p 490
Übergeordnetes Werk:	volume:8 ; year:2020 ; number:490, p 490

Links:	Link aufrufen Link aufrufen Link aufrufen Journal toc

DOI / URN:	10.3390/pr8040490

Katalog-ID:	DOAJ079279953

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520			\|a Over the past two decades, the alkaline persulfate oxidation (PO) with thermal and/or ultraviolet (UV) assisted digestion method has been widely used for digestion of nitrogen containing compounds (N-compounds) in water quality routine analysis in laboratory or on-line analysis, due to its simple principle, high conversion rate, high percent recovery, low-cost. However, this digestion method still has some inevitable problems such as complex operations, high contamination potential, batch N blanks, higher reaction temperature (120–124 °C) and time-consuming (30–60 min). In this study, ozone (O<sub<3</sub<) was selected as the oxidant for digestion of N-compounds through analysis and comparison firstly. Secondly, we proposed and compared the UV and/or ultrasound (US) combined with ozone (UV/O<sub<3</sub<, US/O<sub<3</sub< and UV/US/O<sub<3</sub<) synergistic digestion methods based on O<sub<3</sub< with sole O<sub<3</sub< oxidation method on digestion efficiency (digestion time and conversion rate) of standard N-compounds. Simultaneously, the influence of reaction temperature, pH of water sample, concentration of O<sub<3</sub< and mass flow rate, UV intensity, US frequency and power on digestion efficiency were investigated, and then the optimum parameters for digestion system were obtained. Experimental results indicated that UV radiation can effectively induce and promote the decomposition and photolysis of O<sub<3</sub< in water to generate hydroxyl radicals (•OH), while US can promote the diffusion and dissolution of O<sub<3</sub< in water and intensify the gas-liquid mass transfer process for the reaction system. Meanwhile, results showed that the UV/US/O<sub<3</sub< synergistic digestion method had the best digestion efficiency under the optimum conditions: water sample volume, 10 mL; pH of water sample, 11; O<sub<3</sub< mass flow rate, 3200 mg/h; reaction temperature, 30 °C; digestion time, 25 min; UV lamp power, 18 W; distance between UV lamp and reactor, 2 cm; US frequency, 20 kHz; US power, 75 W. The conversion rate (CR) of synthetic wastewater samples varied from 99.6% to 101.4% for total dissolved nitrogen (TDN) in the range of 1.0~4.0 mg/L. The UV/US/O<sub<3</sub< synergistic digestion method would be an effective and potential alternative for digestion of N-compounds in water quality routine analysis in laboratory or on-line analysis.
650		4	\|a total dissolved nitrogen
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allfields	10.3390/pr8040490 doi (DE-627)DOAJ079279953 (DE-599)DOAJ417cde9b9d0e446799616661984a92c0 DE-627 ger DE-627 rakwb eng TP1-1185 QD1-999 Xiaofang Sun verfasserin aut Investigations on Ozone-Based and UV/US-Assisted Synergistic Digestion Methods for the Determination of Total Dissolved Nitrogen in Waters 2020 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier Over the past two decades, the alkaline persulfate oxidation (PO) with thermal and/or ultraviolet (UV) assisted digestion method has been widely used for digestion of nitrogen containing compounds (N-compounds) in water quality routine analysis in laboratory or on-line analysis, due to its simple principle, high conversion rate, high percent recovery, low-cost. However, this digestion method still has some inevitable problems such as complex operations, high contamination potential, batch N blanks, higher reaction temperature (120–124 °C) and time-consuming (30–60 min). In this study, ozone (O<sub<3</sub<) was selected as the oxidant for digestion of N-compounds through analysis and comparison firstly. Secondly, we proposed and compared the UV and/or ultrasound (US) combined with ozone (UV/O<sub<3</sub<, US/O<sub<3</sub< and UV/US/O<sub<3</sub<) synergistic digestion methods based on O<sub<3</sub< with sole O<sub<3</sub< oxidation method on digestion efficiency (digestion time and conversion rate) of standard N-compounds. Simultaneously, the influence of reaction temperature, pH of water sample, concentration of O<sub<3</sub< and mass flow rate, UV intensity, US frequency and power on digestion efficiency were investigated, and then the optimum parameters for digestion system were obtained. Experimental results indicated that UV radiation can effectively induce and promote the decomposition and photolysis of O<sub<3</sub< in water to generate hydroxyl radicals (•OH), while US can promote the diffusion and dissolution of O<sub<3</sub< in water and intensify the gas-liquid mass transfer process for the reaction system. Meanwhile, results showed that the UV/US/O<sub<3</sub< synergistic digestion method had the best digestion efficiency under the optimum conditions: water sample volume, 10 mL; pH of water sample, 11; O<sub<3</sub< mass flow rate, 3200 mg/h; reaction temperature, 30 °C; digestion time, 25 min; UV lamp power, 18 W; distance between UV lamp and reactor, 2 cm; US frequency, 20 kHz; US power, 75 W. The conversion rate (CR) of synthetic wastewater samples varied from 99.6% to 101.4% for total dissolved nitrogen (TDN) in the range of 1.0~4.0 mg/L. The UV/US/O<sub<3</sub< synergistic digestion method would be an effective and potential alternative for digestion of N-compounds in water quality routine analysis in laboratory or on-line analysis. total dissolved nitrogen digestion method digestion efficiency intensification ozone Chemical technology Chemistry Huixuan Chen verfasserin aut Zhengyu Liu verfasserin aut Mengfei Zhou verfasserin aut Yijun Cai verfasserin aut Haitian Pan verfasserin aut Luyue Xia verfasserin aut In Processes MDPI AG, 2013 8(2020), 490, p 490 (DE-627)750371439 (DE-600)2720994-5 22279717 nnns volume:8 year:2020 number:490, p 490 https://doi.org/10.3390/pr8040490 kostenfrei https://doaj.org/article/417cde9b9d0e446799616661984a92c0 kostenfrei https://www.mdpi.com/2227-9717/8/4/490 kostenfrei https://doaj.org/toc/2227-9717 Journal toc kostenfrei GBV_USEFLAG_A SYSFLAG_A GBV_DOAJ GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_39 GBV_ILN_40 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_74 GBV_ILN_95 GBV_ILN_105 GBV_ILN_110 GBV_ILN_151 GBV_ILN_161 GBV_ILN_170 GBV_ILN_213 GBV_ILN_230 GBV_ILN_285 GBV_ILN_293 GBV_ILN_602 GBV_ILN_2014 GBV_ILN_4012 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4249 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4307 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4338 GBV_ILN_4367 GBV_ILN_4700 AR 8 2020 490, p 490
spelling	10.3390/pr8040490 doi (DE-627)DOAJ079279953 (DE-599)DOAJ417cde9b9d0e446799616661984a92c0 DE-627 ger DE-627 rakwb eng TP1-1185 QD1-999 Xiaofang Sun verfasserin aut Investigations on Ozone-Based and UV/US-Assisted Synergistic Digestion Methods for the Determination of Total Dissolved Nitrogen in Waters 2020 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier Over the past two decades, the alkaline persulfate oxidation (PO) with thermal and/or ultraviolet (UV) assisted digestion method has been widely used for digestion of nitrogen containing compounds (N-compounds) in water quality routine analysis in laboratory or on-line analysis, due to its simple principle, high conversion rate, high percent recovery, low-cost. However, this digestion method still has some inevitable problems such as complex operations, high contamination potential, batch N blanks, higher reaction temperature (120–124 °C) and time-consuming (30–60 min). In this study, ozone (O<sub<3</sub<) was selected as the oxidant for digestion of N-compounds through analysis and comparison firstly. Secondly, we proposed and compared the UV and/or ultrasound (US) combined with ozone (UV/O<sub<3</sub<, US/O<sub<3</sub< and UV/US/O<sub<3</sub<) synergistic digestion methods based on O<sub<3</sub< with sole O<sub<3</sub< oxidation method on digestion efficiency (digestion time and conversion rate) of standard N-compounds. Simultaneously, the influence of reaction temperature, pH of water sample, concentration of O<sub<3</sub< and mass flow rate, UV intensity, US frequency and power on digestion efficiency were investigated, and then the optimum parameters for digestion system were obtained. Experimental results indicated that UV radiation can effectively induce and promote the decomposition and photolysis of O<sub<3</sub< in water to generate hydroxyl radicals (•OH), while US can promote the diffusion and dissolution of O<sub<3</sub< in water and intensify the gas-liquid mass transfer process for the reaction system. Meanwhile, results showed that the UV/US/O<sub<3</sub< synergistic digestion method had the best digestion efficiency under the optimum conditions: water sample volume, 10 mL; pH of water sample, 11; O<sub<3</sub< mass flow rate, 3200 mg/h; reaction temperature, 30 °C; digestion time, 25 min; UV lamp power, 18 W; distance between UV lamp and reactor, 2 cm; US frequency, 20 kHz; US power, 75 W. The conversion rate (CR) of synthetic wastewater samples varied from 99.6% to 101.4% for total dissolved nitrogen (TDN) in the range of 1.0~4.0 mg/L. The UV/US/O<sub<3</sub< synergistic digestion method would be an effective and potential alternative for digestion of N-compounds in water quality routine analysis in laboratory or on-line analysis. total dissolved nitrogen digestion method digestion efficiency intensification ozone Chemical technology Chemistry Huixuan Chen verfasserin aut Zhengyu Liu verfasserin aut Mengfei Zhou verfasserin aut Yijun Cai verfasserin aut Haitian Pan verfasserin aut Luyue Xia verfasserin aut In Processes MDPI AG, 2013 8(2020), 490, p 490 (DE-627)750371439 (DE-600)2720994-5 22279717 nnns volume:8 year:2020 number:490, p 490 https://doi.org/10.3390/pr8040490 kostenfrei https://doaj.org/article/417cde9b9d0e446799616661984a92c0 kostenfrei https://www.mdpi.com/2227-9717/8/4/490 kostenfrei https://doaj.org/toc/2227-9717 Journal toc kostenfrei GBV_USEFLAG_A SYSFLAG_A GBV_DOAJ GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_39 GBV_ILN_40 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_74 GBV_ILN_95 GBV_ILN_105 GBV_ILN_110 GBV_ILN_151 GBV_ILN_161 GBV_ILN_170 GBV_ILN_213 GBV_ILN_230 GBV_ILN_285 GBV_ILN_293 GBV_ILN_602 GBV_ILN_2014 GBV_ILN_4012 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4249 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4307 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4338 GBV_ILN_4367 GBV_ILN_4700 AR 8 2020 490, p 490
allfields_unstemmed	10.3390/pr8040490 doi (DE-627)DOAJ079279953 (DE-599)DOAJ417cde9b9d0e446799616661984a92c0 DE-627 ger DE-627 rakwb eng TP1-1185 QD1-999 Xiaofang Sun verfasserin aut Investigations on Ozone-Based and UV/US-Assisted Synergistic Digestion Methods for the Determination of Total Dissolved Nitrogen in Waters 2020 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier Over the past two decades, the alkaline persulfate oxidation (PO) with thermal and/or ultraviolet (UV) assisted digestion method has been widely used for digestion of nitrogen containing compounds (N-compounds) in water quality routine analysis in laboratory or on-line analysis, due to its simple principle, high conversion rate, high percent recovery, low-cost. However, this digestion method still has some inevitable problems such as complex operations, high contamination potential, batch N blanks, higher reaction temperature (120–124 °C) and time-consuming (30–60 min). In this study, ozone (O<sub<3</sub<) was selected as the oxidant for digestion of N-compounds through analysis and comparison firstly. Secondly, we proposed and compared the UV and/or ultrasound (US) combined with ozone (UV/O<sub<3</sub<, US/O<sub<3</sub< and UV/US/O<sub<3</sub<) synergistic digestion methods based on O<sub<3</sub< with sole O<sub<3</sub< oxidation method on digestion efficiency (digestion time and conversion rate) of standard N-compounds. Simultaneously, the influence of reaction temperature, pH of water sample, concentration of O<sub<3</sub< and mass flow rate, UV intensity, US frequency and power on digestion efficiency were investigated, and then the optimum parameters for digestion system were obtained. Experimental results indicated that UV radiation can effectively induce and promote the decomposition and photolysis of O<sub<3</sub< in water to generate hydroxyl radicals (•OH), while US can promote the diffusion and dissolution of O<sub<3</sub< in water and intensify the gas-liquid mass transfer process for the reaction system. Meanwhile, results showed that the UV/US/O<sub<3</sub< synergistic digestion method had the best digestion efficiency under the optimum conditions: water sample volume, 10 mL; pH of water sample, 11; O<sub<3</sub< mass flow rate, 3200 mg/h; reaction temperature, 30 °C; digestion time, 25 min; UV lamp power, 18 W; distance between UV lamp and reactor, 2 cm; US frequency, 20 kHz; US power, 75 W. The conversion rate (CR) of synthetic wastewater samples varied from 99.6% to 101.4% for total dissolved nitrogen (TDN) in the range of 1.0~4.0 mg/L. The UV/US/O<sub<3</sub< synergistic digestion method would be an effective and potential alternative for digestion of N-compounds in water quality routine analysis in laboratory or on-line analysis. total dissolved nitrogen digestion method digestion efficiency intensification ozone Chemical technology Chemistry Huixuan Chen verfasserin aut Zhengyu Liu verfasserin aut Mengfei Zhou verfasserin aut Yijun Cai verfasserin aut Haitian Pan verfasserin aut Luyue Xia verfasserin aut In Processes MDPI AG, 2013 8(2020), 490, p 490 (DE-627)750371439 (DE-600)2720994-5 22279717 nnns volume:8 year:2020 number:490, p 490 https://doi.org/10.3390/pr8040490 kostenfrei https://doaj.org/article/417cde9b9d0e446799616661984a92c0 kostenfrei https://www.mdpi.com/2227-9717/8/4/490 kostenfrei https://doaj.org/toc/2227-9717 Journal toc kostenfrei GBV_USEFLAG_A SYSFLAG_A GBV_DOAJ GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_39 GBV_ILN_40 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_74 GBV_ILN_95 GBV_ILN_105 GBV_ILN_110 GBV_ILN_151 GBV_ILN_161 GBV_ILN_170 GBV_ILN_213 GBV_ILN_230 GBV_ILN_285 GBV_ILN_293 GBV_ILN_602 GBV_ILN_2014 GBV_ILN_4012 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4249 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4307 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4338 GBV_ILN_4367 GBV_ILN_4700 AR 8 2020 490, p 490
allfieldsGer	10.3390/pr8040490 doi (DE-627)DOAJ079279953 (DE-599)DOAJ417cde9b9d0e446799616661984a92c0 DE-627 ger DE-627 rakwb eng TP1-1185 QD1-999 Xiaofang Sun verfasserin aut Investigations on Ozone-Based and UV/US-Assisted Synergistic Digestion Methods for the Determination of Total Dissolved Nitrogen in Waters 2020 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier Over the past two decades, the alkaline persulfate oxidation (PO) with thermal and/or ultraviolet (UV) assisted digestion method has been widely used for digestion of nitrogen containing compounds (N-compounds) in water quality routine analysis in laboratory or on-line analysis, due to its simple principle, high conversion rate, high percent recovery, low-cost. However, this digestion method still has some inevitable problems such as complex operations, high contamination potential, batch N blanks, higher reaction temperature (120–124 °C) and time-consuming (30–60 min). In this study, ozone (O<sub<3</sub<) was selected as the oxidant for digestion of N-compounds through analysis and comparison firstly. Secondly, we proposed and compared the UV and/or ultrasound (US) combined with ozone (UV/O<sub<3</sub<, US/O<sub<3</sub< and UV/US/O<sub<3</sub<) synergistic digestion methods based on O<sub<3</sub< with sole O<sub<3</sub< oxidation method on digestion efficiency (digestion time and conversion rate) of standard N-compounds. Simultaneously, the influence of reaction temperature, pH of water sample, concentration of O<sub<3</sub< and mass flow rate, UV intensity, US frequency and power on digestion efficiency were investigated, and then the optimum parameters for digestion system were obtained. Experimental results indicated that UV radiation can effectively induce and promote the decomposition and photolysis of O<sub<3</sub< in water to generate hydroxyl radicals (•OH), while US can promote the diffusion and dissolution of O<sub<3</sub< in water and intensify the gas-liquid mass transfer process for the reaction system. Meanwhile, results showed that the UV/US/O<sub<3</sub< synergistic digestion method had the best digestion efficiency under the optimum conditions: water sample volume, 10 mL; pH of water sample, 11; O<sub<3</sub< mass flow rate, 3200 mg/h; reaction temperature, 30 °C; digestion time, 25 min; UV lamp power, 18 W; distance between UV lamp and reactor, 2 cm; US frequency, 20 kHz; US power, 75 W. The conversion rate (CR) of synthetic wastewater samples varied from 99.6% to 101.4% for total dissolved nitrogen (TDN) in the range of 1.0~4.0 mg/L. The UV/US/O<sub<3</sub< synergistic digestion method would be an effective and potential alternative for digestion of N-compounds in water quality routine analysis in laboratory or on-line analysis. total dissolved nitrogen digestion method digestion efficiency intensification ozone Chemical technology Chemistry Huixuan Chen verfasserin aut Zhengyu Liu verfasserin aut Mengfei Zhou verfasserin aut Yijun Cai verfasserin aut Haitian Pan verfasserin aut Luyue Xia verfasserin aut In Processes MDPI AG, 2013 8(2020), 490, p 490 (DE-627)750371439 (DE-600)2720994-5 22279717 nnns volume:8 year:2020 number:490, p 490 https://doi.org/10.3390/pr8040490 kostenfrei https://doaj.org/article/417cde9b9d0e446799616661984a92c0 kostenfrei https://www.mdpi.com/2227-9717/8/4/490 kostenfrei https://doaj.org/toc/2227-9717 Journal toc kostenfrei GBV_USEFLAG_A SYSFLAG_A GBV_DOAJ GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_39 GBV_ILN_40 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_74 GBV_ILN_95 GBV_ILN_105 GBV_ILN_110 GBV_ILN_151 GBV_ILN_161 GBV_ILN_170 GBV_ILN_213 GBV_ILN_230 GBV_ILN_285 GBV_ILN_293 GBV_ILN_602 GBV_ILN_2014 GBV_ILN_4012 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4249 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4307 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4338 GBV_ILN_4367 GBV_ILN_4700 AR 8 2020 490, p 490
allfieldsSound	10.3390/pr8040490 doi (DE-627)DOAJ079279953 (DE-599)DOAJ417cde9b9d0e446799616661984a92c0 DE-627 ger DE-627 rakwb eng TP1-1185 QD1-999 Xiaofang Sun verfasserin aut Investigations on Ozone-Based and UV/US-Assisted Synergistic Digestion Methods for the Determination of Total Dissolved Nitrogen in Waters 2020 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier Over the past two decades, the alkaline persulfate oxidation (PO) with thermal and/or ultraviolet (UV) assisted digestion method has been widely used for digestion of nitrogen containing compounds (N-compounds) in water quality routine analysis in laboratory or on-line analysis, due to its simple principle, high conversion rate, high percent recovery, low-cost. However, this digestion method still has some inevitable problems such as complex operations, high contamination potential, batch N blanks, higher reaction temperature (120–124 °C) and time-consuming (30–60 min). In this study, ozone (O<sub<3</sub<) was selected as the oxidant for digestion of N-compounds through analysis and comparison firstly. Secondly, we proposed and compared the UV and/or ultrasound (US) combined with ozone (UV/O<sub<3</sub<, US/O<sub<3</sub< and UV/US/O<sub<3</sub<) synergistic digestion methods based on O<sub<3</sub< with sole O<sub<3</sub< oxidation method on digestion efficiency (digestion time and conversion rate) of standard N-compounds. Simultaneously, the influence of reaction temperature, pH of water sample, concentration of O<sub<3</sub< and mass flow rate, UV intensity, US frequency and power on digestion efficiency were investigated, and then the optimum parameters for digestion system were obtained. Experimental results indicated that UV radiation can effectively induce and promote the decomposition and photolysis of O<sub<3</sub< in water to generate hydroxyl radicals (•OH), while US can promote the diffusion and dissolution of O<sub<3</sub< in water and intensify the gas-liquid mass transfer process for the reaction system. Meanwhile, results showed that the UV/US/O<sub<3</sub< synergistic digestion method had the best digestion efficiency under the optimum conditions: water sample volume, 10 mL; pH of water sample, 11; O<sub<3</sub< mass flow rate, 3200 mg/h; reaction temperature, 30 °C; digestion time, 25 min; UV lamp power, 18 W; distance between UV lamp and reactor, 2 cm; US frequency, 20 kHz; US power, 75 W. The conversion rate (CR) of synthetic wastewater samples varied from 99.6% to 101.4% for total dissolved nitrogen (TDN) in the range of 1.0~4.0 mg/L. The UV/US/O<sub<3</sub< synergistic digestion method would be an effective and potential alternative for digestion of N-compounds in water quality routine analysis in laboratory or on-line analysis. total dissolved nitrogen digestion method digestion efficiency intensification ozone Chemical technology Chemistry Huixuan Chen verfasserin aut Zhengyu Liu verfasserin aut Mengfei Zhou verfasserin aut Yijun Cai verfasserin aut Haitian Pan verfasserin aut Luyue Xia verfasserin aut In Processes MDPI AG, 2013 8(2020), 490, p 490 (DE-627)750371439 (DE-600)2720994-5 22279717 nnns volume:8 year:2020 number:490, p 490 https://doi.org/10.3390/pr8040490 kostenfrei https://doaj.org/article/417cde9b9d0e446799616661984a92c0 kostenfrei https://www.mdpi.com/2227-9717/8/4/490 kostenfrei https://doaj.org/toc/2227-9717 Journal toc kostenfrei GBV_USEFLAG_A SYSFLAG_A GBV_DOAJ GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_39 GBV_ILN_40 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_74 GBV_ILN_95 GBV_ILN_105 GBV_ILN_110 GBV_ILN_151 GBV_ILN_161 GBV_ILN_170 GBV_ILN_213 GBV_ILN_230 GBV_ILN_285 GBV_ILN_293 GBV_ILN_602 GBV_ILN_2014 GBV_ILN_4012 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4249 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4307 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4338 GBV_ILN_4367 GBV_ILN_4700 AR 8 2020 490, p 490
language	English
source	In Processes 8(2020), 490, p 490 volume:8 year:2020 number:490, p 490
sourceStr	In Processes 8(2020), 490, p 490 volume:8 year:2020 number:490, p 490
format_phy_str_mv	Article
institution	findex.gbv.de
topic_facet	total dissolved nitrogen digestion method digestion efficiency intensification ozone Chemical technology Chemistry
isfreeaccess_bool	true
container_title	Processes
authorswithroles_txt_mv	Xiaofang Sun @@aut@@ Huixuan Chen @@aut@@ Zhengyu Liu @@aut@@ Mengfei Zhou @@aut@@ Yijun Cai @@aut@@ Haitian Pan @@aut@@ Luyue Xia @@aut@@
publishDateDaySort_date	2020-01-01T00:00:00Z
hierarchy_top_id	750371439
id	DOAJ079279953
language_de	englisch
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callnumber-first	T - Technology
author	Xiaofang Sun
spellingShingle	Xiaofang Sun misc TP1-1185 misc QD1-999 misc total dissolved nitrogen misc digestion method misc digestion efficiency misc intensification misc ozone misc Chemical technology misc Chemistry Investigations on Ozone-Based and UV/US-Assisted Synergistic Digestion Methods for the Determination of Total Dissolved Nitrogen in Waters
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topic_title	TP1-1185 QD1-999 Investigations on Ozone-Based and UV/US-Assisted Synergistic Digestion Methods for the Determination of Total Dissolved Nitrogen in Waters total dissolved nitrogen digestion method digestion efficiency intensification ozone
topic	misc TP1-1185 misc QD1-999 misc total dissolved nitrogen misc digestion method misc digestion efficiency misc intensification misc ozone misc Chemical technology misc Chemistry
topic_unstemmed	misc TP1-1185 misc QD1-999 misc total dissolved nitrogen misc digestion method misc digestion efficiency misc intensification misc ozone misc Chemical technology misc Chemistry
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title	Investigations on Ozone-Based and UV/US-Assisted Synergistic Digestion Methods for the Determination of Total Dissolved Nitrogen in Waters
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title_full	Investigations on Ozone-Based and UV/US-Assisted Synergistic Digestion Methods for the Determination of Total Dissolved Nitrogen in Waters
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author_browse	Xiaofang Sun Huixuan Chen Zhengyu Liu Mengfei Zhou Yijun Cai Haitian Pan Luyue Xia
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title_sort	investigations on ozone-based and uv/us-assisted synergistic digestion methods for the determination of total dissolved nitrogen in waters
callnumber	TP1-1185
title_auth	Investigations on Ozone-Based and UV/US-Assisted Synergistic Digestion Methods for the Determination of Total Dissolved Nitrogen in Waters
abstract	Over the past two decades, the alkaline persulfate oxidation (PO) with thermal and/or ultraviolet (UV) assisted digestion method has been widely used for digestion of nitrogen containing compounds (N-compounds) in water quality routine analysis in laboratory or on-line analysis, due to its simple principle, high conversion rate, high percent recovery, low-cost. However, this digestion method still has some inevitable problems such as complex operations, high contamination potential, batch N blanks, higher reaction temperature (120–124 °C) and time-consuming (30–60 min). In this study, ozone (O<sub<3</sub<) was selected as the oxidant for digestion of N-compounds through analysis and comparison firstly. Secondly, we proposed and compared the UV and/or ultrasound (US) combined with ozone (UV/O<sub<3</sub<, US/O<sub<3</sub< and UV/US/O<sub<3</sub<) synergistic digestion methods based on O<sub<3</sub< with sole O<sub<3</sub< oxidation method on digestion efficiency (digestion time and conversion rate) of standard N-compounds. Simultaneously, the influence of reaction temperature, pH of water sample, concentration of O<sub<3</sub< and mass flow rate, UV intensity, US frequency and power on digestion efficiency were investigated, and then the optimum parameters for digestion system were obtained. Experimental results indicated that UV radiation can effectively induce and promote the decomposition and photolysis of O<sub<3</sub< in water to generate hydroxyl radicals (•OH), while US can promote the diffusion and dissolution of O<sub<3</sub< in water and intensify the gas-liquid mass transfer process for the reaction system. Meanwhile, results showed that the UV/US/O<sub<3</sub< synergistic digestion method had the best digestion efficiency under the optimum conditions: water sample volume, 10 mL; pH of water sample, 11; O<sub<3</sub< mass flow rate, 3200 mg/h; reaction temperature, 30 °C; digestion time, 25 min; UV lamp power, 18 W; distance between UV lamp and reactor, 2 cm; US frequency, 20 kHz; US power, 75 W. The conversion rate (CR) of synthetic wastewater samples varied from 99.6% to 101.4% for total dissolved nitrogen (TDN) in the range of 1.0~4.0 mg/L. The UV/US/O<sub<3</sub< synergistic digestion method would be an effective and potential alternative for digestion of N-compounds in water quality routine analysis in laboratory or on-line analysis.
abstractGer	Over the past two decades, the alkaline persulfate oxidation (PO) with thermal and/or ultraviolet (UV) assisted digestion method has been widely used for digestion of nitrogen containing compounds (N-compounds) in water quality routine analysis in laboratory or on-line analysis, due to its simple principle, high conversion rate, high percent recovery, low-cost. However, this digestion method still has some inevitable problems such as complex operations, high contamination potential, batch N blanks, higher reaction temperature (120–124 °C) and time-consuming (30–60 min). In this study, ozone (O<sub<3</sub<) was selected as the oxidant for digestion of N-compounds through analysis and comparison firstly. Secondly, we proposed and compared the UV and/or ultrasound (US) combined with ozone (UV/O<sub<3</sub<, US/O<sub<3</sub< and UV/US/O<sub<3</sub<) synergistic digestion methods based on O<sub<3</sub< with sole O<sub<3</sub< oxidation method on digestion efficiency (digestion time and conversion rate) of standard N-compounds. Simultaneously, the influence of reaction temperature, pH of water sample, concentration of O<sub<3</sub< and mass flow rate, UV intensity, US frequency and power on digestion efficiency were investigated, and then the optimum parameters for digestion system were obtained. Experimental results indicated that UV radiation can effectively induce and promote the decomposition and photolysis of O<sub<3</sub< in water to generate hydroxyl radicals (•OH), while US can promote the diffusion and dissolution of O<sub<3</sub< in water and intensify the gas-liquid mass transfer process for the reaction system. Meanwhile, results showed that the UV/US/O<sub<3</sub< synergistic digestion method had the best digestion efficiency under the optimum conditions: water sample volume, 10 mL; pH of water sample, 11; O<sub<3</sub< mass flow rate, 3200 mg/h; reaction temperature, 30 °C; digestion time, 25 min; UV lamp power, 18 W; distance between UV lamp and reactor, 2 cm; US frequency, 20 kHz; US power, 75 W. The conversion rate (CR) of synthetic wastewater samples varied from 99.6% to 101.4% for total dissolved nitrogen (TDN) in the range of 1.0~4.0 mg/L. The UV/US/O<sub<3</sub< synergistic digestion method would be an effective and potential alternative for digestion of N-compounds in water quality routine analysis in laboratory or on-line analysis.
abstract_unstemmed	Over the past two decades, the alkaline persulfate oxidation (PO) with thermal and/or ultraviolet (UV) assisted digestion method has been widely used for digestion of nitrogen containing compounds (N-compounds) in water quality routine analysis in laboratory or on-line analysis, due to its simple principle, high conversion rate, high percent recovery, low-cost. However, this digestion method still has some inevitable problems such as complex operations, high contamination potential, batch N blanks, higher reaction temperature (120–124 °C) and time-consuming (30–60 min). In this study, ozone (O<sub<3</sub<) was selected as the oxidant for digestion of N-compounds through analysis and comparison firstly. Secondly, we proposed and compared the UV and/or ultrasound (US) combined with ozone (UV/O<sub<3</sub<, US/O<sub<3</sub< and UV/US/O<sub<3</sub<) synergistic digestion methods based on O<sub<3</sub< with sole O<sub<3</sub< oxidation method on digestion efficiency (digestion time and conversion rate) of standard N-compounds. Simultaneously, the influence of reaction temperature, pH of water sample, concentration of O<sub<3</sub< and mass flow rate, UV intensity, US frequency and power on digestion efficiency were investigated, and then the optimum parameters for digestion system were obtained. Experimental results indicated that UV radiation can effectively induce and promote the decomposition and photolysis of O<sub<3</sub< in water to generate hydroxyl radicals (•OH), while US can promote the diffusion and dissolution of O<sub<3</sub< in water and intensify the gas-liquid mass transfer process for the reaction system. Meanwhile, results showed that the UV/US/O<sub<3</sub< synergistic digestion method had the best digestion efficiency under the optimum conditions: water sample volume, 10 mL; pH of water sample, 11; O<sub<3</sub< mass flow rate, 3200 mg/h; reaction temperature, 30 °C; digestion time, 25 min; UV lamp power, 18 W; distance between UV lamp and reactor, 2 cm; US frequency, 20 kHz; US power, 75 W. The conversion rate (CR) of synthetic wastewater samples varied from 99.6% to 101.4% for total dissolved nitrogen (TDN) in the range of 1.0~4.0 mg/L. The UV/US/O<sub<3</sub< synergistic digestion method would be an effective and potential alternative for digestion of N-compounds in water quality routine analysis in laboratory or on-line analysis.
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title_short	Investigations on Ozone-Based and UV/US-Assisted Synergistic Digestion Methods for the Determination of Total Dissolved Nitrogen in Waters
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