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| Date |
01-14 Dec 2004
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Background
Papers |
A membrane assisted hybrid bioreactor for
the post treatment of an anaerobic effluent from a fish canning
factory |
| Presented by |
Vinka 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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About the Author
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| Abstract |
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·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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