Aquaculture system with anaerobic denitrification device

Abstract

The invention discloses an aquaculture system with an anaerobic denitrification device, which comprises a circulating aquaculture pond, a microfilter, a water pump, a denitrification device, a CO2 stripping trickle biofilter, a movable biological filter bed, an ultraviolet sterilizer, an efficient pure oxygen mixer and a sedimentation pond; the anaerobic denitrification device is a cylinder or a cuboid, a carbon source released by solid denitrification is used as a biological filler to serve as a carrier for anaerobic denitrification bacteria, and a carbon source and transfer electrons can beprovided for denitrification through biodegradation; a sedimentation pond sewage collection system is used for collecting regularly discharged sewage from a vortex solid-liquid separator, the microfilter and the biofilter, a supernatant liquid of the sedimentation pond sewage collection system can be used again in the circulating water culture system, and a sedimentation liquid can be used for pressing to prepare vegetable organic fertilizers; the invention truly realizes zero discharge of the industrialized circulating aquaculture system, and the system is suitable for high-density industrialized circulating aquaculture of various freshwater and seawater high-quality fish varieties.

Description

technical field [0001] The invention relates to the field of aquaculture, in particular to an aquaculture system with an anaerobic denitrification device. Background technique [0002] With the pressure of the environment and environmental protection, lakes and offshore fish raft cages have been dismantled, and straight-line aquaculture ponds have been shut down. The pressure on aquaculture is also increasing. Closed factory recirculating aquaculture is a sustainable development model that can realize water recycling and no sewage discharge. [0003] At present, there are many kinds of industrial recirculating aquaculture systems developed and applied at home and abroad, but almost none of them meet the zero discharge standard in the true sense; first, the system design is not mature enough and the equipment stability is poor, resulting in ammonia nitrogen and nitrite nitrogen in the water body If it exceeds the standard, it must be solved by changing a large number of wate...

AI Technical Summary

Problems solved by technology

[0003] At present, there are many kinds of industrial recirculating aquaculture systems developed and applied at home and abroad, but almost none of them meet the zero discharge standard in the true sense. First, the system design is not mature enough and the equipment stability is poor, resulting in ammonia nitrogen and nitrite nitrogen in the water. If it exceeds the standard, it must be solved by changing a large number of water, resulting in the direct discharge of a large amount of aquaculture sewage; second, the lack of a mature anaerobic denitrification system device, the accumulation of nitrate produced by the nitrification reaction, the accumulation of nitrate to a certain amount will cause poisoning to fish The impact must be solved by changing a large number of water; at present, there is also a fish and vegetable symbiosis system to solve the problem of nitrate accumulation in the water body, which is solved by vegetable absorption. Large, it is difficult to operate in actual production

[0004] All in all, the current situation seriously restricts the promotion and application of domestic recirculating aquaculture

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