University System of Maryland

Yossi Tal

Harold J Schreier

Yonathan Zohar

The present invention relates to a novel approach for nitrate removal from a marine recirculating system () wherein high concentrations of sulfate found in seawater is used in combination with sludge () collected from fish growing tanks () to promote dissimilatory sulfate reduction to hydrogen sulfide. The sulfide is used as an electron source to promote autotrophic denitrification in an up-flow fix bed bioreactor (), followed by nitrification in a nitrification unit (). By utilizing the symbiotic relationship between the sulfate-reducing and sulfide-oxidizing bacterial community, nitrate accumulation is controlled in the recirculating water of the system thereby reducing water exchange in the marine recirculating system.

Dissimilatory sulfate reduction as a process to promote denitrification in marine recirculating aquaculture systems

Disclosed herein are planctomycetes sp. which convert ammonia to nitrogen under anaerobic conditions, filtration and aquaculture systems comprising said bacteria, filtration media comprising said bacteria, and methods of filtration using said bacteria.

Anaerobic ammonium oxidation for water treatment in recirculating aquaculture

The present invention relates to a two-stage biofilter reactor system for removing nitrogenous compounds from a recirculating aquaculture system. The system includes a aerobic nitrification unit and a downstream anaerobic denitrification unit, wherein both units have a mobile bed of suspended media whereon bacteria can grow and reduce nitrate and/or ammonia levels in the recirculating aquaculture system. Use of the two-stage system has the advantage of reducing the water exchange rates and consumption of salt when maintaining a saline effluent.

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Baltimore, MD, United States of America

Yossi Tal