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Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Rapid Oxidation of Ammonia Nitrogen to Nitrogen Gas by UV-Activated Persulfate with Calcium Oxide
https://orcid.org/0000-0001-5797-8534
Advanced oxidation processes (AOPs) for removing ammonia nitrogen (NH4 +-N) are of increasing interest in wastewater treatment. In this paper, the UV-activated persulfate (PS) process with CaO was applied to oxidize NH4 +-N to nitrogen gas (N2). Nearly all of the NH4 +-N (30 mg N/L) could be removed within 15 min, and the N2 selectivity was achieved at 95.0%. The addition of CaO made NH4 +-N exist in the form of NH3, and HO• was the critical reactive species for NH4 +-N oxidation. NO, N2H4, and NO2 – were identified as oxidation intermediates and could be further removed. The reaction between N2H4 and NO2 – with the assistance of UV/CaO promoted N2 generation during NH4 +-N oxidation. The increased dosages of CaO (0.2 to 4.0 g/L) and PS (0.6 to 2.4 g/L) could enhance the NH4 +-N oxidation, while the presence of CO3 2– (100 mM) significantly retarded the removal of NH4 +-N. As high removal of NH4 +-N (100%) and high N2 selectivity (>79.5%) could be achieved in lake water and secondary wastewater, the proposed UV/PS/CaO process could be potentially applied for the oxidation of NH4 +-N in practical water treatment.
Rapid Oxidation of Ammonia Nitrogen to Nitrogen Gas by UV-Activated Persulfate with Calcium Oxide
https://orcid.org/0000-0001-5797-8534
Advanced oxidation processes (AOPs) for removing ammonia nitrogen (NH4 +-N) are of increasing interest in wastewater treatment. In this paper, the UV-activated persulfate (PS) process with CaO was applied to oxidize NH4 +-N to nitrogen gas (N2). Nearly all of the NH4 +-N (30 mg N/L) could be removed within 15 min, and the N2 selectivity was achieved at 95.0%. The addition of CaO made NH4 +-N exist in the form of NH3, and HO• was the critical reactive species for NH4 +-N oxidation. NO, N2H4, and NO2 – were identified as oxidation intermediates and could be further removed. The reaction between N2H4 and NO2 – with the assistance of UV/CaO promoted N2 generation during NH4 +-N oxidation. The increased dosages of CaO (0.2 to 4.0 g/L) and PS (0.6 to 2.4 g/L) could enhance the NH4 +-N oxidation, while the presence of CO3 2– (100 mM) significantly retarded the removal of NH4 +-N. As high removal of NH4 +-N (100%) and high N2 selectivity (>79.5%) could be achieved in lake water and secondary wastewater, the proposed UV/PS/CaO process could be potentially applied for the oxidation of NH4 +-N in practical water treatment.
Rapid Oxidation of Ammonia Nitrogen to Nitrogen Gas by UV-Activated Persulfate with Calcium Oxide
https://orcid.org/0000-0001-5797-8534
Advanced oxidation processes (AOPs) for removing ammonia nitrogen (NH4 +-N) are of increasing interest in wastewater treatment. In this paper, the UV-activated persulfate (PS) process with CaO was applied to oxidize NH4 +-N to nitrogen gas (N2). Nearly all of the NH4 +-N (30 mg N/L) could be removed within 15 min, and the N2 selectivity was achieved at 95.0%. The addition of CaO made NH4 +-N exist in the form of NH3, and HO• was the critical reactive species for NH4 +-N oxidation. NO, N2H4, and NO2 – were identified as oxidation intermediates and could be further removed. The reaction between N2H4 and NO2 – with the assistance of UV/CaO promoted N2 generation during NH4 +-N oxidation. The increased dosages of CaO (0.2 to 4.0 g/L) and PS (0.6 to 2.4 g/L) could enhance the NH4 +-N oxidation, while the presence of CO3 2– (100 mM) significantly retarded the removal of NH4 +-N. As high removal of NH4 +-N (100%) and high N2 selectivity (>79.5%) could be achieved in lake water and secondary wastewater, the proposed UV/PS/CaO process could be potentially applied for the oxidation of NH4 +-N in practical water treatment.
Rapid Oxidation of Ammonia Nitrogen to Nitrogen Gas by UV-Activated Persulfate with Calcium Oxide
Jiang, Hanling (Autor:in) / Wang, Jingwen (Autor:in) / Zhou, Aijuan (Autor:in) / Liu, Yong (Autor:in)
ACS ES&T Engineering ; 4 ; 1092-1101
10.05.2024
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
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