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A       membrane assisted hybrid bioreactor for the post       treatment 
of an anaerobic       effluent from a fish canning factory
by
Vinka       Oyanedel-Craver
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Date01-14 Dec 2004
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Background 
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A membrane assisted hybrid bioreactor for             the post treatment of an anaerobic effluent from a fish canning             factory
Presented byVinka Oyanedel-Craver             
Research Associate
Department of Civil Engineering
B-228             Thornton Hall
351 McCormick Rd.
PO Box 400742
University             of Virginia
Charlottesville, VA 22904-472, USA
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AbstractAn 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·d and NLR of 1.8 kg N-NH4 +/m3·d. Specific nitrifying             activities of up to 0.78 g N-NH4 +/g protein·d and 0.25 g N-NH4 +/g             VSS·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·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.              

Keywords Biofilm;             denitrification; fish canning; hybrid reactor; nitrification;             ultrafitration membrane

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