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Many recirculating aquaculture systems (RAS) employ a nitrifying biofilter to remove nitrogenous waste from fish excreta and undigested feed. We characterized the microbial communities in these biofilters, identified what organisms are carrying out ammonia- and nitrite-oxidation, and examined whether the life traits of these organisms impact system start-up and typical operation conditions.
In collaboration with Dr. Tim Gundl, we investigated how macronutrients from wastewater treatment systems enter shallow groundwater aquifers and whether this nutrient input alters the microbial community composition and bioactive processes carried out in these ecosystems.
