Institute of Sustainable Processes, University of Valladolid, C/Dr. Mergelina s/n., Valladolid, CP. 47011, Spain; Department of Civil and Environmental Engineering, Yonsei University, Seoul, 03722, Republic of Korea.
Institute of Sustainable Processes, University of Valladolid, C/Dr. Mergelina s/n., Valladolid, CP. 47011, Spain; Department of Chemical Engineering and Environmental Technology, University of Valladolid, C/Dr. Mergelina s/n., Valladolid, CP. 47011, Spain.
Chemosphere. 2024 Aug;361:142528. doi: 10.1016/j.chemosphere.2024.142528. Epub 2024 Jun 3.
Nitrous oxide (NO) emissions in High Rate Algal Ponds (HRAP) can negatively affect the sustainability of algal-bacterial processes. NO emissions from a pilot HRAP devoted to biogas upgrading and digestate treatment were herein monitored for 73 days. The influence of the pH (7.5, 8.5, and 9.5), nitrogen sources (100 mg L of N-NO, N-NO, and N-NH) and illumination on NO emissions from the algal-bacterial biomass of the HRAP was also assessed in batch tests. Significantly higher NO gas concentrations of 311.8 ± 101.1 ppm were recorded in the dark compared to the illuminated period (236.9 ± 82.6 ppm) in the HRAP. The batch tests revealed that the highest NO emission rates (49.4 mmol g TSS·h) occurred at pH 8.5 in the presence of 100 mg N-NO/L under dark conditions. This study revealed significant NO emissions in HRAPs during darkness.
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