Full-scale simultaneous partial nitrification, anammox, and denitrification process for treating swine wastewater
Autor: | Tsukasa Sugiyama, Yasuyuki Fukumoto, Miyoko Waki, Chikako Ishimoto, Hirohide Uenishi, Toshimi Matsumoto |
---|---|
Rok vydání: | 2020 |
Předmět: |
Biochemical oxygen demand
Environmental Engineering Denitrification Nitrogen Swine chemistry.chemical_element Wastewater 010501 environmental sciences 01 natural sciences 03 medical and health sciences Bioreactors Animal science Bioreactor Animals 030304 developmental biology 0105 earth and related environmental sciences Water Science and Technology 0303 health sciences Sewage Chemistry Nitrification Anammox Aeration Oxidation-Reduction |
Zdroj: | Water Science and Technology. 81:456-465 |
ISSN: | 1996-9732 0273-1223 |
DOI: | 10.2166/wst.2020.120 |
Popis: | A full-scale swine-wastewater activated sludge treatment plant that contains naturally enriched anammox biofilms was investigated for 2 years. Red biofilm in this system included Planctomycetes at a maximum of 62.5% of the total bacteria diversity, including Candidatus Jettenia and Candidatus Brocadia. The plant was operated with an influent containing 1,104 ± 513 mg/L biochemical oxygen demand (BOD) and 629 ± 198 mg/L total nitrogen (TN) (BOD/N of 1.78 ± 0.58) at a volumetric BOD loading rate of 0.32 ± 0.12 kg/m3/d. Notwithstanding drastically varying influent concentrations, BOD removal efficiency was stable at 95 ± 4%. However, TN removal fluctuated at 75 ± 14%. Dissolved oxygen (DO) concentrations in the aeration tank were 0.06–2.0 mg/L. DO concentration greatly affected nitrogen removal, e.g. when DO was lower than 0.3 mg/L, total inorganic nitrogen removal was 61 ± 14% (≤20 °C), 78 ± 16% (20–30 °C), and 75 ± 12% (≥30 °C), whereas at higher DO concentrations, removal rates were 47 ± 13%, 55 ± 16%, and 68%, respectively. As BOD concentration in the influent was limited compared to nitrogen concentration, nitrogen was likely removed by simultaneous nitrification, anammox, and denitrification (SNAD) under microaerobic conditions. Maintaining low DO concentrations would therefore be a simple method to improve nitrogen removal during SNAD processes for swine-wastewater treatment with fluctuating influent. |
Databáze: | OpenAIRE |
Externí odkaz: |