Heistad A, Scott T, Skaarer A M, Seidu R, Hanssen J F, Stenström T A
Department of Mathematical Sciences and Technology, Norwegian University of Life Sciences, P.O. Box 5003, 1432 As, Norway.
Water Sci Technol. 2009;60(2):399-407. doi: 10.2166/wst.2009.343.
Enhanced treatment of septic tank effluent can improve the hydraulic function and performance of infiltration systems and constructed wetlands. By intermittent spray application of septic tank effluent onto a coarse-grained filter media, an unsaturated flow regime beneficial for pathogen removal is created. A column filtration study showed an increase in PRD-1 removal by time of operation with corresponding biofilm accumulation in the filter material. The same increased removal was observed for 1 mum polystyrene beads, irrespective of their hydrophilic/hydrophobic surface properties. A control experiment with sorption of 1 mum hydrophobic and hydrophilic polystyrene beads to different glass surfaces with hydrophobic and hydrophilic properties indicate that mechanisms other than hydrophobic interactions may govern the rate of attachment to the filter media. For a given volumetric flow-rate in the columns, the presence of biofilm altered the hydrodynamic characteristics and this resulted in increased retention time and particle removal.
强化化粪池出水的处理可以改善渗透系统和人工湿地的水力功能及性能。通过将化粪池出水间歇喷洒到粗粒过滤介质上，可形成有利于病原体去除的非饱和流态。一项柱式过滤研究表明，随着运行时间的增加，PRD - 1的去除率提高，同时过滤材料中相应地积累了生物膜。对于1微米的聚苯乙烯珠粒，无论其亲水/疏水表面性质如何，都观察到了相同的去除率增加。一项关于1微米疏水和亲水聚苯乙烯珠粒在具有疏水和亲水性质的不同玻璃表面上吸附的对照实验表明，除疏水相互作用外的其他机制可能控制着珠粒附着到过滤介质上的速率。对于柱中给定的体积流量，生物膜的存在改变了水动力特性，这导致停留时间延长和颗粒去除率提高。
