Pozvánka - 7.8. - přednáška Aquaculture
Nick Savidov
Lethbridge College, Canada
Biography
Nick Savidov has completed his PhD from Russian State Agrarian University (RSAU-MTAA) in Moscow, Russian Federation, and postdoctoral studies from Ben-Gurion University of the Negev, Israel, and University of Alberta, Edmonton, Canada. His research interests include Integrated Food Production Systems, IFPS, aquaponics, aerobic bioreactors, environmental microbiology, nutrient recycling, waste management and biochar. Currently, he is a senior research scientist at Lethbridge College and an adjunct professor at University of Lethbridge, University of Lethbridge, Canada.
Abstract
It is estimated that about 50% of all currently consumed seafood is grown on the farms thanks to the fast growth of the world aquaculture. However, large commercial fish farms represent a threat for the environment as a source of pollution. Innovative technologies, like Recirculating Aquaculture Systems and aquaponics, use water more efficiently and substantially decrease the environmental impact of fish farms. In aquaponics the water recirculates between fish tanks and plant growing area, where the plants actively absorb soluble nutrients from liquid fish effluent regenerating water quality for fish production. However, utilization of solid waste is a challenge even for more advanced fish farms. On the other hand, fish manure is one of the most valuable sources of nutrients for plants due to its high nitrogen content (up to 4-5%) and considerably lower risk of contamination by human pathogens like E. coli and Salmonella compared to the manure of warm-blooded animals.
This study represents a novel approach to utilization of solid waste from aquaculture operations, which has been developed since the beginning of 2000s in Alberta, Canada. The solids are aerobically fermented in specially designed vessels to release mineral nutrients, which can be used as a safe and efficient organic fertilizer. The use of the aerobic bioreactors will not just minimize the pollution from fish farms, but also create an additional source of revenue for fish farmers. The design of the aerobic bioreactors for aquaculture and optimization of the parameters for the aerobic fermentation will be discussed.
