Start-up of CANON reactor with modified polyethylene carrier and its performance

A CANON reactor with modified polyethylene carrier was started up by seeding sludge from another mature CANON reactor and using artificial inorganic ammonia-rich waste water as influent. To accelerate ANAMMOX bacteria cultivation, the start-up was under anaerobic conditions first to avoid dissolved oxygen inhibition on ANAMMOX bacteria, and then under aerobic conditions. The reactor was first under anaerobic conditions to start ANAMMOX process at room temperature [(20±5)°C] in first 300 days, however, total nitrogen removal load was only 0.12 kg·(m·d), which meant failure of ANAMMOX. When temperature was increased to 30°C, 30 days later, total nitrogen removal load was up to 0.23 kg·(m·d). Then anaerobic conditions was changed to aerobic conditions, and total nitrogen removal load was up to 1.01 kg·(m·d), while nitrogen 2014-04-28 收到初稿,2014-07-22 收到修改稿。 联系人及第一作者:付昆明(1981—),男,博士,讲师。 基金项目:国家自然科学基金项目(51308025);北京高等学校青 年英才计划项目(YETP1649)。 Received date: 2014-04-28. Corresponding author: FU Kunming, fukunming@163.com Foundation item: supported by the National Natural Science Foundation of China (51308025), Beijing Higher Education Young Elite Teacher Project (YETP1649). 第 11 期 付昆明等:改性聚乙烯填料 CANON 反应器的启动与运行 ·4407· removal efficiency was 77.61%, and average variation ratio of nitrate and nitrogen ( 3 NO -N/ TN − δ δ ) was 0.122, close to theoretical value 0.127, showing both good stability of nitritation and good nitrogen removal. Adopting the way of anaerobic stage first and then aerobic stage could not accelerate ANAMMOX bacteria cultivation as expected, and modified polyethylene carrier was not a suitable carrier to start ANAMMOX process under anaerobic conditions. However, once the reactor was successfully started up, aeration could be saved, though it might perform unstably. Modified polyethylene carrier was suggested to combine with UASB reactor to keep bacteria.