Li Yun, Wang Zhaozhao, Li Jun, Wei Jia, Zhang Yanzhuo, Zhao Baihang
College of Architecture and Civil Engineering, Beijing University of Technology, Beijing 1000124, China.
College of Energy and Environmental Engineering, Hebei University of Engineering, Handan, 056038 Hebei, China.
J Biosci Bioeng. 2017 Apr;123(4):482-488. doi: 10.1016/j.jbiosc.2016.11.007. Epub 2016 Dec 11.
Nitritation can be used as a pretreatment for anaerobic ammonia oxidation (anammox). Various control strategies for nitritation and half-nitritation of old landfill leachate in a membrane bioreactor were investigated in this study and the inhibition kinetics of substrate, product and old landfill leachate on nitritation were analyzed via batch tests. The results demonstrated that old landfill leachate nitritation in the membrane bioreactor can be achieved by adjusting the influent loading and dissolved oxygen (DO). From days 105-126 of the observation period, the average effluent concentration was 871.3 mg/L and the accumulation rate of [Formula: see text] was 97.2%. Half-nitritation was realized quickly by adjusting hydraulic retention time and DO. A low-DO control strategy appeared to best facilitate long-term and stable operation. Nitritation inhibition kinetic experiments showed that the inhibition of old landfill leachate was stronger than that of the substrate [Formula: see text] or product [Formula: see text] . The ammonia oxidation rate dropped by 22.2% when the concentration of old landfill leachate (calculated in chemical oxygen demand) was 1600.2 mg/L; further, when only free ammonia or free nitrous acid were used as a single inhibition factor, the ammonia oxidation rate dropped by 4.7-6.5% or 14.5-15.9%, respectively. Haldane, Aiba, and a revised inhibition kinetic model were adopted to separately fit the experimental data. The R correlation coefficient values for these three models were 0.982, 0.996, and 0.992, respectively.
亚硝化可作为厌氧氨氧化（anammox）的预处理。本研究考察了膜生物反应器中老填埋场渗滤液亚硝化和半亚硝化的各种控制策略，并通过批次试验分析了底物、产物和老填埋场渗滤液对亚硝化的抑制动力学。结果表明，通过调节进水负荷和溶解氧（DO），可实现膜生物反应器中老填埋场渗滤液的亚硝化。在观测期的第105 - 126天，平均出水浓度为871.3 mg/L，[公式：见原文]的积累率为97.2%。通过调节水力停留时间和DO可快速实现半亚硝化。低DO控制策略似乎最有利于长期稳定运行。亚硝化抑制动力学实验表明，老填埋场渗滤液的抑制作用强于底物[公式：见原文]或产物[公式：见原文]。当老填埋场渗滤液浓度（以化学需氧量计）为1600.2 mg/L时，氨氧化速率下降了22.2%；此外，当仅将游离氨或游离亚硝酸作为单一抑制因子时，氨氧化速率分别下降了4.7 - 6.5%或14.5 - 15.9%。采用Haldane、Aiba和修正的抑制动力学模型分别对实验数据进行拟合。这三个模型的R相关系数值分别为0.982、0.996和0.992。
