"For years, Mote has developed aquaculture technology that
recirculates water to reduce the environmental impact of producing seafood--but there's still an impact if you can't use the solid waste," said Dr.
Because they require far less water and capture the wastes, a fish farm that
recirculates its water can be located far from large water bodies and near consumers.
The new system
recirculates up to 90 percent of the water in two fish culture bays at the ARS National Center for Cool and Cold Water Aquaculture (NCCCWA) in Leetown, W.
The edge of the pool lies slightly below the waterline, so water spills over the rim and
recirculates from a downhill basin.
The additional component
recirculates though this valve.
A three-stage filter system reliably
recirculates cleaned exhaust air back into the cleaning and finishing area.
Water
recirculates through a pump placed in a fiberglass pond liner beneath the pot; stones cover the liner.
Because the green sand
recirculates in the foundry, the ammonia can build up in the sand and finally be evident as pinholes in the castings.
The Purifan uses natural high and low air pressure to draw up unclean air and
recirculate the fresh air at a rate of 2,000 cubic feet per minute.