Wastewater Technology Division, National Environmental Engineering Research Institute, Council of Scientific and Industrial Research, Nagpur 440020, India.
J Ind Microbiol Biotechnol. 2010 Aug;37(8):871-6. doi: 10.1007/s10295-010-0744-3. Epub 2010 Jun 11.
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/(m(3) 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.
在单级生物反应器中，通过部分亚硝化和厌氧氨氧化（ANAMMOX）将氨氧化为氮气，这基于抑制硝化过程。在实验室规模的固定膜生物反应器中进行的单级工艺通过“三路控制机制”来控制硝化过程，从而实现了 4 小时水力停留时间（HRT）下 0.7kgNH4-N/（m³天）的氨去除率，该机制包括控制电子供体（亚硝酸盐）、电子受体（氧气）和碳源（碳酸氢盐）。控制进料中的碱度和溶解氧（DO）浓度，以保持碱度与氨的比例小于 8，DO 负荷小于 0.06mgO/（mgN 天），这对于抑制硝化和增强部分亚硝化和 ANAMMOX 是必要的。因此，进料碱度和 DO 浓度是单级生物脱氮工艺中的关键控制参数。
