Galí A, Dosta J, Mata-Alvarez J
Department of Chemical Engineering University of Barcelona. Martí i Franquès, 1, 6th floor, 08028 Barcelona, Spain.
Environ Technol. 2007 May;28(5):565-71. doi: 10.1080/09593332808618817.
An optimal sequencing batch reactor (SBR) strategy is proposed for Biological Nitrogen Removal (BNR) via nitrite of reject water (800-900 NH4+-N mg l(-1)) from mesophilic (35 degrees C) anaerobic sludge digester of a Spanish Municipal Wastewater Treatment Plant (WWTP). Two lab-scale SBR with control of temperature were studied with external COD addition for denitrification which was necessary due to the lack of readily biodegradable carbon source. Process kinetics were compared through the specific Ammonium Uptake Rate (sAUR) finding the appropriate operational sequences when working at 32 degrees C and 8 hour cycle length. Every operating cycle was carried out with a sludge retention time of 11 days, hydraulic retention time around 1 day and 2500+/-250 mg VSS l(-1). In order to avoid nitrate formation and thus save costs, the oxygen concentration was maintained below 1 mg V1 during aerobic periods and pH remained within an optimal range (7.5-9) alternating different aerobic-anoxic subcycles inside the operational cycle. With this strategy, the range of alkalinity could be controlled avoiding the addition of external additives and nitrite accumulation was prevented. Therefore, the reached sAUR was 22 mg NH4+-N g)-1) VSS h(-1) and the total nitrogen removal was 0.8 kg N(d m(3))(-1).
针对西班牙某城市污水处理厂（WWTP）中温（35℃）厌氧污泥消化池排出的废水（800 - 900 mg/L NH₄⁺-N）通过亚硝酸盐进行生物脱氮（BNR），提出了一种优化的序批式反应器（SBR）策略。研究了两个实验室规模的、控制温度的SBR，通过添加外部化学需氧量（COD）进行反硝化，这是由于缺乏易生物降解的碳源所必需的。通过比铵摄取率（sAUR）比较了工艺动力学，确定了在32℃和8小时周期长度下运行时合适的操作顺序。每个运行周期的污泥停留时间为11天,水力停留时间约为1天，污泥浓度为2500±250 mg VSS/L。为了避免硝酸盐的形成从而节省成本，在好氧阶段将氧浓度维持在1 mg/L以下，pH值保持在最佳范围（7.5 - 9），在运行周期内交替不同的好氧-缺氧子周期。采用这种策略，可以控制碱度范围，避免添加外部添加剂，并防止亚硝酸盐积累。因此，达到的比铵摄取率为22 mg NH₄⁺-N/（g⁻¹ VSS h⁻¹），总氮去除率为0.8 kg N/（d m⁻³）。
