Developing a rapid start-up technology for a novel moving bed anammox biofilm reactor MBABR

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The partial nitritation-anammox (PNA) process is an energy efficient option for nitrogen removal that has been developed for high temperature, high-nitrogen load industrial streams. The PNA process allows for removal of ammonia nitrogen, a toxic compound, and total nitrogen, a nutrient contributing to eutrophication of surface waters, without the use of expensive external carbon sources, and 60% less aeration requirements than conventional treatment. Thereby, PNA could increase cost-effectiveness of nitrogen removal by 30% and significantly reduce chemical requirements for total nitrogen removal. Implementation of PNA anammox for**Canadian municipal wastewaters would benefit communities faced with aging infrastructure and the need to upgrade to more stringent effluent nutrient limits. However, the PNA process has not yet been demonstrated as an effective treatment method for low temperature and low nitrogen concentration (40 mg N/L) municipal wastewaters typical of Canadian municipalities. Headworks-Bio, a Canadian vendor of moving bed biofilm reactors (MBBR) has been striving to expand into the anaerobic MBBR and was interested in development of an PNA bioreactor to answer the growing market. With unresolved problems associated with low temperature and low concentration systems, the project proposes solutions to the major issues preventing implementation of**PNA to Canadian municipal wastewaters: 1) rapid establishment of autotrophic biofilm, the microorganisms performing treatment, under low temperatures and low nitrogen loads; and 2) control mechanisms for prolonged process stability by preventing the establishment of undesirable microorganisms (nitrite oxidizers).