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

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