Oyanedel V, Garrido J M, Lema J M, Méndez R
Department of Chemical Engineering, High Technical School of Engineering, University of Santiago de Compostela, Avda. Lope Gómez de Marzoa s.n. Campus Sur, E-15782, Santiago de Compostela, Galicia, Spain.
Water Sci Technol. 2003;48(6):301-9.
An innovative membrane assisted hybrid bioreactor was used to treat a mixture of two streams produced in a fish canning factory: a highly loaded stream that had previously been treated in an anaerobic contact reactor, and a second stream with a relatively low COD and N concentration. Experiments were carried out during two experimental stages: an aerobic stage, which is focused in the study on the aerobic oxidation of ammonia and COD and a nitrification-denitrification stage in which the study was mainly focused on the removal of nitrogen. Results of the aerobic period pointed out that it was feasible to achieve ammonia and COD removals of around 99% at OLR of 6.5 kg COD/m3 x d and NLR of 1.8 kg N-NH4+/m3 x d. Specific nitrifying activities of up to 0.78 g N-NH4+/g protein x d and 0.25 g N-NH4+/g VSS x d, were recorded for the attached and suspended biomass, respectively. Around 50-60% of the nitrifying capacity of the reactor was a result of the nitrifying capacity of the biofilm. During the nitrification-denitrification stage 76% of nitrogen removal was attained at an NLR of 0.8 kg N-NH4+/m3 x d. The biofilm nitrifying activity was not affected by the operating conditions of the system, as a result of the preferential consumption of COD by suspended biomass in the reactor. Thus, the combination of a hybrid system, with both suspended and attached biomass, and an ultrafiltration membrane module might be an alternative for treating wastewaters in compact biological systems. The intrinsic characteristics of the system made it feasible to operate at high OLR without problems related with the settling properties of the sludge or the drop in the nitrogen conversion. There were no solids in the effluent as a result of the use of the membrane filtration module.
一股是先前在厌氧接触反应器中处理过的高负荷废水，另一股是化学需氧量（COD）和氮浓度相对较低的废水。实验分两个阶段进行：一个是好氧阶段，重点研究氨和COD的好氧氧化；另一个是硝化-反硝化阶段，主要研究氮的去除。好氧阶段的结果表明，在有机负荷率（OLR）为6.5 kg COD/m³·d和氮负荷率（NLR）为1.8 kg N-NH₄⁺/m³·d的条件下，实现约99%的氨和COD去除是可行的。附着生物量和悬浮生物量的特定硝化活性分别高达0.78 g N-NH₄⁺/g蛋白质·d和0.25 g N-NH₄⁺/g挥发性悬浮固体（VSS）·d。反应器约50%-60%的硝化能力来自生物膜的硝化能力。在硝化-反硝化阶段，当NLR为0.8 kg N-NH₄⁺/m³·d时，氮去除率达到76%。由于反应器中悬浮生物量优先消耗COD，生物膜硝化活性不受系统运行条件的影响。因此，将既有悬浮生物量又有附着生物量的混合系统与超滤膜组件相结合，可能是紧凑型生物系统中处理废水的一种替代方案。该系统的固有特性使其能够在高OLR下运行，而不会出现与污泥沉降性能或氮转化率下降相关的问题。由于使用了膜过滤组件，出水没有固体物质。
