Yang Yandong, Zhang Liang, Han Xiaoyu, Zhang Shujun, Li Baikun, Peng Yongzhen
State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin 150090, China E-mail:
Beijing Drainage Group Co. Ltd (BDG), Beijing 100022, China.
Water Sci Technol. 2016;73(9):2085-92. doi: 10.2166/wst.2016.052.
The partial nitritation/anammox (PN/A) process has been applied to ammonium-rich wastewater treatment, but the operational boundary has not been well determined for long-term stability. This pilot-scale study was targeted at a single-stage PN/A process using a sequencing batch reactor (SBR) (volume: 53 m(3)) and granulated activated sludge. The maximum nitrogen removal rate reached 0.83 kg N/(m(3)·d). Microbial analysis suggested that ammonium oxidizing bacteria were mainly present in small sludge flocs while anammox bacteria were prone to grow in large sludge granules. The PN/A performance was enhanced when dissolved oxygen (DO) was increased from 0.25 to 0.76 mg/L, and deteriorated at DO higher than 1.15 mg/L. The PN/A was inhibited at free ammonia (FA) over 77.0 mg/L. High DO or FA concentrations inhibited anammox activity and further induced high and inhibitory nitrite concentrations. Therefore, appropriate DO and FA concentrations should be controlled to achieve single-stage PN/A in SBRs.
部分亚硝化/厌氧氨氧化（PN/A）工艺已应用于高氨废水处理，但长期稳定性的运行边界尚未得到很好的确定。这项中试规模研究针对的是使用序批式反应器（SBR）（体积：53立方米）和颗粒状活性污泥的单级PN/A工艺。最大脱氮率达到0.83千克氮/（立方米·天）。微生物分析表明，氨氧化细菌主要存在于小的污泥絮体中，而厌氧氨氧化细菌倾向于在大的污泥颗粒中生长。当溶解氧（DO）从0.25毫克/升增加到0.76毫克/升时，PN/A性能得到增强，而在DO高于1.15毫克/升时性能恶化。当游离氨（FA）超过77.0毫克/升时，PN/A受到抑制。高DO或FA浓度会抑制厌氧氨氧化活性，并进一步导致高浓度且具有抑制作用的亚硝酸盐。因此，应控制适当的DO和FA浓度，以在SBR中实现单级PN/A。
