At present, China and many countries in the world are interested in recirculating aquaculture. Pond culture, cage culture, runway breeding commercial scale recirculating aquaculture way, but its economic feasibility is still immeasurable. Recirculating aquaculture, the high cost and thus recirculating aquaculture system designers faced the challenge is how to increase the production capacity of the unit amount of the investment. A variety of equipment which, in the circulating water system should be designed into a set of systems, reduce maintenance costs and increase the stability of its run.
   
Breeding pools
The system of breeding pools with round the pools or square chamfer pool, pool center has backwater and the outfall, inlet wall tangential direction of the circulation, aquaculture water formed in the pool, farming sewage gradually to the bottom center of the breeding pond aggregate and form a vortex-like routed backwater main channel.
 
Frame or box-type drum microfiltration machine
Circulating pump through the backwater main channel aquaculture wastewater sent to the microfiltration machine filter, remove the breeding process granular dirt; microfiltration machine adopts micro-mesh filter, the suspended dirt residue mesh, by backwash device to wash away the dirt removal system.
 
Foam separator
After filtration of the circulating water flows into the bubble separator, the bubbles in the bubble separator granular organic and mucus water adsorbed on the foam surface, and the foam is then collected in the liquid collection cup, the foam is formed after the rupture of the liquid collection cup containing dirty liquid is excluded. The foam separator can remove water most of the dissolved organics, Venturi sufficiently mixed gas with water in the bottom of the product through the venturi pumping the water into the bubble separator, making soft drinks mixed continuously into the barrel.
     
Biological package
Residual water, the tiny and organic matter dissolved state, The foam separator purified recycled water, and then via biological package flora oxidation of ammonia into nitrate.
 
Gas / water separator
Then circulating water flow to the gas / water separator gas / water separation and discharge of water, carbon dioxide and dissolved organic waste gas, the water quality of the recycled water fishery water quality standards.
 
Heating means and an oxygen / water mixed and dissolved machine
Mixing Machine, temperature and dissolved oxygen content of water temperature and dissolved oxygen transferred breeding inter gas after circulating water, heating device and oxygen / water.
     
UV disinfection machine
The last circulating water and then disinfected by ultraviolet disinfection machine to reduce the number of bacteria in the water, to flow back into the culture ponds reach breeding requirements, complete a full cycle.
      
Listed above are the main equipment in the recirculating aquaculture systems, recirculating aquaculture continues to improve the design of a system should optimize the design according to the specific circumstances.