Alkalinity and dissolved oxygen as controlling parameters for ammonia removal through partial nitritation and ANAMMOX in a single-stage bioreactor |
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Authors: | Samik Bagchi Rima Biswas Tapas Nandy |
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Institution: | (1) Wastewater Technology Division, National Environmental Engineering Research Institute, Council of Scientific and Industrial Research, Nagpur, 440 020, India |
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Abstract: | The oxidation of ammonia to dinitrogen through partial nitritation and anaerobic ammonium oxidation (ANAMMOX) in a single-stage
bioreactor is based on suppressing the nitratation process. The single-stage process operated on a laboratory-scale fixed
film bioreactor achieved ammonia removal of 0.7 kg NH4-N/(m3 day) at 4 h hydraulic retention time (HRT) by controlling the nitratation process through a ‘three-way control mechanism’
comprising control of electron donor (nitrite), electron acceptor (oxygen) and carbon source (bicarbonate). The control of
alkalinity and dissolved oxygen (DO) concentrations in feed to maintain an alkalinity to ammonia ratio of less than 8 and
DO loading of less than 0.06 mg O/(mg N day), respectively, was necessary for inhibiting nitratation and enhancing partial
nitritation and ANAMMOX. Therefore, feed alkalinity along with DO concentrations are critical controlling parameters in a
single-stage biological process for nitrogen removal. |
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Keywords: | |
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