Dissimilatory sulfate reduction as a process to promote...

Details Dissimilatory sulfate reduction as a process to promote... Dissimilatory sulfate reduction as a process to promote...

C - Chemistry, Metallurgy

02

F

C02F 3/30 (2006.01) A01K 63/04 (2006.01) C02F 11/04 (2006.01)

Patent

CA 2554958

The present invention relates to a novel approach for nitrate removal from a marine recirculating system (10) wherein high concentrations of sulfate found in seawater is used in combination with sludge (20) collected from fish growing tanks (12) 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 (16), followed by nitrification in a nitrification unit (14). 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.

La présente invention concerne un nouveau procédé d'extraction de nitrates dans un système à recirculation marin (10) consistant à employer des concentrations élevées de sulfate provenant d'eau de mer, en combinaison avec des boues (20) recueillies dans des bacs de pisciculture (12), afin de promouvoir la réduction de sulfate sans assimilation en sulfure d'hydrogène. Le sulfure est employé comme source d'électrons afin de promouvoir la dénitrification dans un bioréacteur à lit solide à conduite ascendante (16), la nitrification ayant ensuite lieu dans une unité de nitrification (14). L'utilisation de la relation symbiotique entre la communauté bactérienne de réduction de sulfate et d'oxydation de sulfate permet de contrôler les nitrates dans l'eau de recirculation du système de manière à réduire l'échange d'eau dans le système de recirculation marin.

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