Hu Jingyi, Aarts Annelies, Shang Ran, Heijman Bas, Rietveld Luuk
Department of Municipal Engineering, School of Civil Engineering and Architecture, Wuhan University of Technology, Wuhan, China; Department of Water Management, Faculty of Civil Engineering and Geoscience, Delft University of Technology, P.O. Box 5048, 2600, GA, Delft, The Netherlands.
Department of Water Management, Faculty of Civil Engineering and Geoscience, Delft University of Technology, P.O. Box 5048, 2600, GA, Delft, The Netherlands.
J Environ Manage. 2016 Jul 15;177:45-52. doi: 10.1016/j.jenvman.2016.04.003. Epub 2016 Apr 12.
Integrating powdered activated carbon (PAC) into wastewater tertiary treatment is a promising technology to reduce organic micro-pollutant (OMP) discharge into the receiving waters. To take advantage of the existing tertiary filter, PAC was pre-embedded inside the filter bed acting as a fixed-bed adsorber. The pre-embedding (i.e. immobilization) of PAC was realized by direct dosing a PAC solution on the filter top, which was then promoted to penetrate into the filter media by a down-flow of tap water. In order to examine the effectiveness of this PAC pre-embedded filter towards OMP removal, batch adsorption tests, representing PAC contact reactor (with the same PAC mass-to-treated water volume ratio as in the PAC pre-embedded filter) were performed as references. Moreover, as a conventional dosing option, PAC was dosed continuously with the filter influent (i.e. the wastewater secondary effluent with the investigated OMPs). Comparative results confirmed a higher OMP removal efficiency associated with the PAC pre-embedded filter, as compared to the batch system with a practical PAC residence time. Furthermore, over a filtration period of 10 h (approximating a realistic filtration cycle for tertiary filters), the continuous dosing approach resulted in less OMP removal. Therefore, it was concluded that the pre-embedding approach can be preferentially considered when integrating PAC into the wastewater tertiary treatment for OMP elimination.
将粉末活性炭（PAC）集成到废水深度处理中是一种很有前景的技术，可减少有机微污染物（OMP）排放到受纳水体中。为了利用现有的深度过滤器，将PAC预先嵌入滤床中作为固定床吸附器。通过在过滤器顶部直接投加PAC溶液来实现PAC的预嵌入（即固定化），然后通过自来水的向下流动促使其渗透到过滤介质中。为了检验这种PAC预嵌入过滤器对去除OMP的有效性，进行了批次吸附试验，即代表PAC接触反应器（其PAC质量与处理水量的比例与PAC预嵌入过滤器中的相同）作为参考。此外，作为一种传统的投加方式，将PAC与过滤器进水（即含有被研究OMP的废水二级出水）连续投加。对比结果证实，与具有实际PAC停留时间的批次系统相比，PAC预嵌入过滤器具有更高的OMP去除效率。此外，在10小时的过滤期内（近似于深度过滤器的实际过滤周期），连续投加方式导致的OMP去除量较少。因此，得出的结论是，在将PAC集成到废水深度处理以去除OMP时，可以优先考虑预嵌入方法。
