Application of biofilm reactors to improve ammonia oxidation in low nitrogen loaded wastewater |
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Authors: | Seca I Torres R Val del Río A Mosquera-Corral A Campos J L Méndez R |
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Affiliation: | 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. isabel.seca@rai.usc.es |
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Abstract: | 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. |
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