Ecotype enclosed method for culturing fish through circulation water

Abstract

The invention discloses an ecotype enclosed method for culturing fish through circulation water. Natural seawater, underground salt water, underground fresh water and geothermal water are mainly utilized and mixed, and an industrial culture foundation for producing pollution-free healthy seafood is built and used. A solid-liquid separation purification device is used for replacing sand filtration of a biological filter, ammonia nitrogen and nitrite nitrogen are degraded after water passing through a biological film on biological filler in the biological filter, and the total purification rate of water body particles is over 99%. An aeration pond is arranged to conduct aeration and oxygenation on a culture water body to enable the content of dissolved oxygen in water in a fish culture pond to be kept at 8-14mg / L, finally the water body is sterilized through ultraviolet light, clean ecological water is input into the fish culture pond, and the return water in the fish culture pond is purified repeatedly and utilized in a circulating mode. Sewage discharged from a culture system is purified by an open-air pond and flows back to a water storage sedimentation pond to achieve zero-discharge complete enclosed circulation water factory-like fish culture.

Description

technical field [0001] The invention belongs to the field of aquaculture industrialization, and in particular relates to an ecological closed circulation water fish farming method. It mainly uses natural seawater, underground salt water, underground fresh water and geothermal water to deploy and recycle to build an industrial breeding base for the production of pollution-free and healthy seafood. Background technique [0002] Among the disclosed technologies, its patent No. is 200910128325.7, and its name is "ecological type closed circulation water fish farming method". It is mainly used to build a water storage sedimentation tank and a water distribution workshop near the water intake near the coast; a fish pond is built in the fish farming workshop, and a backwater channel is built outside the fish pond for sedimentation and separation. After ultraviolet disinfection, water is supplied to the fish ponds; the sewage discharged from the fish farming process is purified by ...

AI Technical Summary

Problems solved by technology

[0003] 1. The first-level biological filter is a sand filter, which is easy to block. It needs 3-4 manual backwashing every day. It takes 50-60 minutes for each person to backwash one sand filter each time; the water cycle needs to be stopped during backwashing. The dissolved oxygen in the water in the fish pond is supplemented by flowing water. If the flowing water stops, the consumption of dissolved oxygen will decrease, resulting in a large change in the living environment of fish, which is not conducive to the metabolism and growth of fish; more water will be consumed during backwashing , the labor intensity of the workers is high; the more serious disadvantage is that when the workers backwash, it is easy to break the screen to prevent sand leakage under the sand layer, and the sand leaks through the screen, deposits at the bottom, turns black and smelly, pollutes water quality, and affects fish. growth and reduce the survival rate of fish, that is, human factors have a greater impact

[0004] 2. The ultraviolet sterilizer is a cylindrical structure designed in the water supply pipeline. There are two disadvantages in such an ultraviolet sterilizer. One is that the installation is difficult and maintenance is troublesome; the other is that the quartz sleeve is equipped with an ultraviolet lamp, and the outer wall of the quartz sleeve is viscous. After blocking the ultraviolet rays and reducing the disinfection effect, the quartz sleeve must be taken out regularly to clean the dirt on its outer wall, which is very inconvenient

[0005] 3. There are disadvantages in using the backwater channel for sedimentation and separation. The backwater channel is 60,000mm long and 500mm wide, and the particles are deposited scattered. It takes more than 30 minutes for each return channel, and it is not easy to clean. Particles remain on the return channel, which affects the water quality. At the same time, the water in the channel must be drained during cleaning, which is a waste of water

The gas-liquid mixing pump and the diffuser only increase the oxygen in the water, which has a single function and does not have the function of separation and purification

[0007] 5. There is a triangular dead angle area near the boundary wall of the graded biofilter, which is not conducive to water quality exchange and the formation of biofilm

Images