Water and Environmental Engineering, Department of Chemical Engineering, Lund University, SE-221 00 Lund, Sweden.
Water Res. 2013 Sep 1;47(13):4498-506. doi: 10.1016/j.watres.2013.05.010. Epub 2013 May 21.
Removal of organic micropollutants in a hybrid biofilm-activated sludge process was investigated through batch experiments, modeling, and full-scale measurements. Batch experiments with carriers and activated sludge from the same full-scale reactor were performed to assess the micropollutant removal rates of the carrier biofilm under oxic conditions and the sludge under oxic and anoxic conditions. Clear differences in the micropollutant removal kinetics of the attached and suspended growth were demonstrated, often with considerably higher removal rates for the biofilm compared to the sludge. For several micropollutants, the removal rates were also affected by the redox conditions, i.e. oxic and anoxic. Removal rates obtained from the batch experiments were used to model the micropollutant removal in the full-scale process. The results from the model and plant measurements showed that the removal efficiency of the process can be predicted with acceptable accuracy (± 25%) for most of the modeled micropollutants. Furthermore, the model estimations indicate that the attached growth in hybrid biofilm-activated sludge processes can contribute significantly to the removal of individual compounds, such as diclofenac.
通过批处理实验、建模和全尺寸测量研究了混合生物膜-活性污泥工艺中有机微量污染物的去除。使用来自同一全尺寸反应器的载体和活性污泥进行批处理实验，以评估载体生物膜在好氧条件下和活性污泥在好氧和缺氧条件下的微量污染物去除率。附着生长和悬浮生长的微量污染物去除动力学表现出明显的差异，生物膜的去除率通常比污泥高得多。对于几种微量污染物，去除率也受到氧化还原条件（即好氧和缺氧）的影响。从批处理实验中获得的去除率用于模拟全尺寸工艺中的微量污染物去除。模型和工厂测量的结果表明，对于大多数建模的微量污染物，过程的去除效率可以用可接受的精度（±25%）进行预测。此外，模型估计表明，混合生物膜-活性污泥工艺中的附着生长可以显著有助于去除个别化合物，如双氯芬酸。
