Parco V, du Toit G, Wentzel M, Ekama G
Water Research Group, Civil Engineering Department, University of Cape Town, Rondebosch, 7701, South Africa.
Water Sci Technol. 2007;56(6):125-34. doi: 10.2166/wst.2007.642.
The impact of including membranes for solid liquid separation on the kinetics of nitrogen and phosphorus removal was investigated. To achieve this, a membrane bioreactor (MBR) biological nutrient removal (BNR) activated sludge system was operated. From batch tests on mixed liquor drawn from the MBR BNR system, denitrification and phosphorus removal rates were delineated. Additionally the influence of the high total suspended solids concentrations present in the MBR BNR system and of the limitation of substrate concentrations on the kinetics was investigated. Moreover the ability of activated sludge in this kind of system to denitrify under anoxic conditions with simultaneous phosphate uptake was verified and quantified. The denitrification rates obtained for different mixed liquor (ML) concentrations indicate no effect of ML concentration on the specific denitrification rate. The denitrification took place at a single specific rate (K(2)) with respect to the ordinary heterotrophic organisms (OHOs, i.e. non-PAOs) active mass. Similarly, results have been obtained for the P removal process kinetics: no differences in specific rates were observed for different ML or substrate concentrations. From the P removal batch tests results it seems that the biological phosphorus removal population (PAO) consists of 2 different sets of organisms denitrifying PAO and aerobic PAO.
研究了包含用于固液分离的膜对氮磷去除动力学的影响。为此，运行了一个膜生物反应器（MBR）生物营养物去除（BNR）活性污泥系统。通过对从MBR BNR系统抽取的混合液进行批次试验，确定了反硝化和除磷速率。此外，还研究了MBR BNR系统中存在的高总悬浮固体浓度以及底物浓度限制对动力学的影响。此外，还验证并量化了这种系统中活性污泥在缺氧条件下同时吸收磷酸盐时进行反硝化的能力。不同混合液（ML）浓度下获得的反硝化速率表明，ML浓度对特定反硝化速率没有影响。反硝化相对于普通异养生物（OHOs，即非聚磷菌）的活性质量以单一特定速率（K(2)）进行。同样，除磷过程动力学也得到了类似结果：不同ML或底物浓度下未观察到特定速率的差异。从除磷批次试验结果来看，生物除磷菌群（聚磷菌）似乎由两组不同的生物组成，即反硝化聚磷菌和好氧聚磷菌。
