Industrial circulating water fish farming denitrification zero emission system

Abstract

The invention relates to an industrial circulating water fish-culture denitrification zero-emission system which comprises a culture pond, wherein a plant cultivation structure is put up above the culture pond; the culture pond is connected to a primary filtration device; one path of the primary filtration device is connected to a regulating pond and the other path of the primary filtration device is connected to a sludge pond; the treatment front end of the regulating pond is connected to an electro migration device; the alkaline end of the electro migration device is connected to a front end membrane concentration device; the high concentration end of the front end membrane concentration device is connected to a plant culture solution storage pond and the low concentration end of the front end membrane concentration device is connected to the acidic end of the electro migration device; the acidic end of the electro migration device is connected to a tail end membrane concentration device; the low concentration end of the tail end membrane concentration device is connected to the treatment tail end of the regulating pond and the high concentration end of the tail end membrane concentration device is connected to the sludge pond; the treatment tail end of the regulating pond is connected to the culture pond. According to the invention, high-nitrogen water in the plant culture solution storage pond is better absorbed by plants, and circulating water in the culture pond facilitates fish culture, so that yields of both plants and fish are increased.

Description

technical field [0001] The invention relates to a factory-like circulating water fish culture denitrification and zero-emission system. Background technique [0002] In the industrial recirculating aquaculture system, 70%-80% of the bait eaten by fish is discharged into the water in the form of metabolites or residual bait (mainly organic matter and ammonia nitrogen) through gill diffusion and ion exchange. Under the action of microorganisms, these substances will generate "three nitrogens", namely: ammonia nitrogen, nitrite nitrogen and nitrate nitrogen. "Three nitrogens" cause many harms to fish, and also cause the color and meat quality of fish to decline. [0003] When dissolved oxygen is insufficient, denitrifying bacteria use organic carbon compounds such as methanol and acetic acid as electron donors, nitrate nitrogen or nitrite nitrogen as electron acceptors, and reduce nitrate or nitrite to nitrous oxide or nitrous oxide. Nitrogen process known as denitrification....

AI Technical Summary

Problems solved by technology

However, in high-density circulating water fish farming, the "three nitrogens" (the total content of N) in the circulating water rise rapidly, and they are only absorbed by plants, which requires a large area for vegetable cultivation

After the vegetable enters the vegetative growth period, the effective range of its nutrient absorption will greatly exceed the tolerance of the fish to ammonia nitrogen, nitrite and other nutrients; Vegetables grow slowly, have serious nutritional deficiencies, low yields, and low efficiency in absorbing "three nitrogens"

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