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- Title
Nitrate reduction by · CO<sub>2</sub> from UV-activated HCOOH.
- Authors
Xu Yiqiao; Wu Lei; Zheng Tianyi
- Abstract
To address the environmental and health hazards of nitrate (NO3-) in water, a denitrification advanced reduction process (ARP) using only formic acid (HCOOH) activated by ultraviolet (UV) light was proposed. The efficiency, influencing factors, mechanism, and kinetics of the reduction were investigated through component analysis and radical detection. Results show that, after 90 min of UV illumination, the reduction and gas conversion ratios of 50 mg/L NO3--N reach 99. 9% and 99. 8%, respectively, under 9 mM of Co (HCOOH), pH = 3.0, and N2 aeration. Meanwhile, 96.7% of HCOOH is consumed and converted into gas. The NO3- -N conversion process includes the transformation to NO2--N, followed by a further reduction to gas and a direct conversion into gas, introducing small amounts of nitrite and ammonia. The carbon dioxide anion radical (· CO2) from HCOOH/HCOO- is the principal cause of NO3--N reduction by UV/ HCOOH/N2 ARP. In contrast, · CO2 production is caused by the hydroxyl radical (· OH). The NO3-N reduction efficiency is enhanced by the increase in the light intensity, considerably affected by the initial pH, and less affected by inorganic anions, including Cl, H2PO4, and HCO3/CO3. The initial HCOOH concentration and light intensity are the main factors that influence the NO3--N reduction rate.
- Subjects
NITRATE reductase; NITROREDUCTASES; HAZARDS; FORMIC acid; ULTRAVIOLET radiation
- Publication
Journal of Southeast University (English Edition), 2022, Vol 38, Issue 1, p77
- ISSN
1003-7985
- Publication type
Article
- DOI
10.3969/j.issn.1003-7985.2022.01.012