Shizuoka Prefectural Research Institute of Animal Industry, Swine and Poultry Research Center, 2780 Nishikata, Kikugawa, Shizuoka 439-0037, Japan.
Division of Animal Sciences, Institute of Agrobiological Sciences, National Agriculture and Food Research Organization (NARO), 1-2 Owashi, Tsukuba, Ibaraki 305-8634, Japan.
Water Sci Technol. 2020 Feb;81(3):456-465. doi: 10.2166/wst.2020.120.
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/m/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.
对一座包含自然富集厌氧氨氧化生物膜的全规模猪粪废水活性污泥处理厂进行了为期 2 年的研究。该系统中的红色生物膜中最大含量为 62.5%的总细菌多样性为 Planctomycetes，包括 Candidatus Jettenia 和 Candidatus Brocadia。该工厂以含有 1104±513mg/L 生化需氧量（BOD）和 629±198mg/L 总氮（TN）（BOD/N 为 1.78±0.58）的进水进行运行，体积 BOD 负荷率为 0.32±0.12kg/m/d。尽管进水浓度变化很大，但 BOD 去除效率仍稳定在 95±4%。然而，TN 去除率波动在 75±14%。曝气池中的溶解氧（DO）浓度为 0.06-2.0mg/L。DO 浓度对氮去除有很大影响，例如当 DO 低于 0.3mg/L 时，总无机氮去除率分别为 61±14%（≤20°C）、78±16%（20-30°C）和 75±12%（≥30°C），而在较高的 DO 浓度下，去除率分别为 47±13%、55±16%和 68%。由于与氮浓度相比，进水的 BOD 浓度有限，因此在微氧条件下，氮可能通过同步硝化、厌氧氨氧化和反硝化（SNAD）去除。因此，保持低 DO 浓度将是提高波动进水的猪粪废水处理中 SNAD 过程氮去除的一种简单方法。
