Genz Arne, Kornmüller Anja, Jekel Martin
Department of Water Quality Control, Technical University Berlin, Sekr. KF 4, Strasse des 17. Juni 135, 10623 Berlin, Germany.
Water Res. 2004 Sep;38(16):3523-30. doi: 10.1016/j.watres.2004.06.006.
The advanced phosphorus (P) removal by adsorption was studied for its suitability as a post-treatment step for membrane bioreactor (MBR) effluents low in P concentration and particle content. Two commercial adsorbents, granulated ferric hydroxide (GFH) and activated aluminium oxide (AA), were studied in batch tests and lab-scale filter tests for P adsorption in MBR filtrates. GFH showed a higher maximum capacity for phosphate and a higher affinity at low P concentrations compared to AA. Competition by inorganic ions was negligible for both adsorbents at the original pH (8.2). When equilibrium P concentrations exceeded 2 mg L(-1) in the spiked MBR filtrates, a precipitation of calcium phosphates occurred additionally to adsorption. During column studies the effluent criteria of 50 microgL(-1) P was reached after a throughput of 8000 bed volumes for GFH and 4000 for AA. Dissolved organic carbon appears to be the strongest competitor for adsorption sites. A partial regeneration and reloading of both adsorbents could be achieved by the use of sodium hydroxide.
研究了通过吸附深度除磷作为膜生物反应器（MBR）低磷浓度和低颗粒含量出水后处理步骤的适用性。在批量试验和实验室规模的过滤试验中，研究了两种商业吸附剂，即粒状氢氧化铁（GFH）和活性氧化铝（AA）对MBR滤液中磷的吸附情况。与AA相比，GFH对磷酸盐的最大吸附容量更高，且在低磷浓度下具有更高的亲和力。在初始pH值（8.2）时，两种吸附剂对无机离子的竞争可忽略不计。当加标的MBR滤液中平衡磷浓度超过2 mg L⁻¹时，除吸附外还会发生磷酸钙沉淀。在柱试验中，GFH在8000床体积的通量后达到了50 μg L⁻¹磷的出水标准，而AA在4000床体积的通量后达到该标准。溶解有机碳似乎是吸附位点的最强竞争者。通过使用氢氧化钠可以实现两种吸附剂的部分再生和再装填。
