Department of Biotechnology, Delft University of Technology, Julianalaan 67, Delft 2628 BC, The Netherlands.
Department of Biotechnology, Delft University of Technology, Julianalaan 67, Delft 2628 BC, The Netherlands.
Water Res. 2014 Dec 1;66:111-121. doi: 10.1016/j.watres.2014.07.047. Epub 2014 Aug 14.
Autotrophic nitrogen removal in the main stream appears as a prerequisite for the implementation of energy autarchic wastewater treatment plants. To investigate autotrophic nitrogen removal a lab-scale gas-lift sequencing batch reactor with granular sludge was operated for more than 500 days. The reactor was operated at temperatures between 20 and 10 °C on autotrophic medium with ammonium (60 and 160 mg-N L(-1)) as only nitrogen compound at an HRT of 0.23-0.3 d. The dissolved oxygen (DO) concentration was shown to be an effective control parameter for the suppression of the undesired nitratation process. DO control guaranteed the effective suppression of the nitratation both at 20 and 15 °C, allowing nitrogen removal rates of 0.4 g-NTot L(-1) d(-1) at nitrogen removal efficiencies of 85-75%. Prolonged operation at 10 °C caused a slow but unrestrainable decrease in anammox activity and process efficiency. This study represents a proof of concept for the application of the autotrophic nitrogen removal in a single reactor with granular sludge at main stream conditions.
在实现能源自给型废水处理厂的过程中，主流程中的自养脱氮似乎是一个先决条件。为了研究自养脱氮，我们使用带有颗粒污泥的实验室规模气升式序批式反应器进行了超过 500 天的运行。该反应器在 20 至 10°C 的温度下，以仅含铵（60 和 160mg-N L(-1)）的自养培养基为氮源，HRT 为 0.23-0.3d。溶解氧（DO）浓度被证明是抑制不需要的硝化过程的有效控制参数。在 20 和 15°C 时，DO 控制均能有效抑制硝化作用，氮去除率为 0.4g-NTot L(-1) d(-1)，氮去除效率为 85-75%。在 10°C 下长时间运行会导致厌氧氨氧化活性和工艺效率的缓慢但不可阻挡的下降。本研究证明了在主流程条件下，使用带有颗粒污泥的单一反应器实现自养脱氮的概念验证。
