Melicz Z
Department of Sanitary and Environmental Engineering, Budapest University of Technology and Economics, Müegyetem rkp. 3. UV building, H-1111 Budapest, Hungary.
Water Sci Technol. 2003;47(11):93-9.
The South-Budapest Municipal Wastewater Treatment Plant (SBWWTP) based on the high-load activated sludge process (AS) was upgraded into nutrient removal in 1998-1999 in Hungary. Biofor type nitrifying (NP) and denitrifying (DN) biofilters were implemented for nitrogen removal downstream of the (AS) stage in order to meet the required effluent standards characterized by 50 mgCOD l(-1), 10 mgBOI5 l(-1), 10 mgTN l(-1), 1 mgTP l(-1) and 35 mgTSS l(-1). Phosphorus removal is obtained by chemical addition. The study presented sums up the performance of the upgraded plant throughout 25 months. Besides the efficient pre-denitrification obtained in the AS basin, significant ammonium oxidation was observed in the aerated zone, upon the introduction of recirculation of nitrate rich water and backwash water. The introduction of biofilter backwash water, containing nitrifying biomass, has generated significant ammonium conversion in the aerated basins, where nitrification was observed previously to a very limited extent. Process parameters of the AS stage were: aerobic sludge age of 1.5-2.0 days, 1.5 hours hydraulic retention time, specific sludge load of 1.1 kgCOD kgMLSS(-1) d(-1). The nitrification in the AS tank has significantly reduced below 16 degrees C, however, denitrification efficiency was not as highly dependent upon temperature during the investigated period. The paper investigates the nitrogen balance of the plant in two aspects: (i) the effects of seeding on nitrification in the high load AS reactor and (ii) pre-denitrification potential in the anoxic zone of the AS tank of the pre-settled wastewater.
匈牙利布达佩斯南部城市污水处理厂（SBWWTP）基于高负荷活性污泥法（AS）运行，于1998 - 1999年进行了升级改造以实现养分去除。为了满足出水标准要求（50 mgCOD l(-1)、10 mgBOI5 l(-1)、10 mgTN l(-1)、1 mgTP l(-1)和35 mgTSS l(-1)），在（AS）阶段下游设置了Biofor型硝化（NP）和反硝化（DN）生物滤池用于脱氮。通过化学投加实现除磷。本研究总结了升级后25个月期间该污水处理厂的运行性能。除了在AS池获得高效的前置反硝化外，在引入富含硝酸盐的水和反冲洗水进行循环后，在曝气区观察到显著的氨氧化现象。引入含有硝化生物质的生物滤池反冲洗水，在曝气池中产生了显著的氨转化，而此前在曝气池中硝化作用非常有限。AS阶段的工艺参数为：好氧污泥龄1.5 - 2.0天，水力停留时间1.5小时，比污泥负荷1.1 kgCOD kgMLSS(-1) d(-1)。在16摄氏度以下时，AS池中的硝化作用显著降低，然而，在所研究期间反硝化效率对温度的依赖性没有那么高。本文从两个方面研究了该污水处理厂的氮平衡：（i）接种对高负荷AS反应器中硝化作用的影响；（ii）初沉废水AS池缺氧区的前置反硝化潜力。
