Department of Chemical Engineering, School of Engineering, Rua Lope Gómez de Marzoa s/n, University of Santiago de Compostela, E-15782 Santiago de Compostela, Spain.
Water Sci Technol. 2011;63(9):1880-6. doi: 10.2166/wst.2011.400.
An airlift reactor using zeolite particles as carrier material was used for the nitrification of effluents from the aquaculture industry. During the start-up the nitrogen concentration was kept around 100 mg NH4(+)-N/L to develop the nitrifying population. Later it was decreased down to around 3 mg NH4(+)-N/L and the dilution rate was increased up to 4.8 d(-1) in order to simulate the conditions in a an aquaculture waster treatment system. A nitrogen loading rate (NLR) of 535 mg NH(+)-N/m2 d was fully oxidized to nitrate. Higher values of NLRs caused nitrite accumulation. A second biofilm reactor was fed with a synthetic medium containing 50 mg NH4(+)-N/L which simulated the effluents from anaerobic units treating domestic wastewater. A nitrogen loading rate of 400 mg NH4(+)-N/L d was oxidized into nitrate with an efficiency of 60% at a dilution rate of 8 d(-1). Both biofilm systems allowed the development of a nitrifying population to treat the studied types of wastewaters.
采用沸石颗粒作为载体材料的气升式反应器用于处理水产养殖废水中的硝化作用。在启动过程中，将氮浓度保持在 100mgNH4 (+)-N/L 左右，以培养硝化菌群。之后，将其降低到约 3mgNH4 (+)-N/L，并将稀释率提高到 4.8d(-1)，以模拟水产养殖废水处理系统中的条件。氮负荷（NLR）为 535mgNH（+）-N/m2 d 被完全氧化为硝酸盐。更高的 NLR 值会导致亚硝酸盐积累。第二个生物膜反应器中使用含有 50mgNH4 (+)-N/L 的合成培养基，模拟处理生活污水的厌氧单元的流出物。氮负荷为 400mgNH4 (+)-N/L d，在稀释率为 8d(-1)时，氧化效率为 60%，可将硝酸盐氧化成硝酸盐。这两个生物膜系统都允许硝化菌群的发展，以处理研究中的废水类型。
