Biological filtering device for moving bed

Abstract

The invention relates to biological filtering equipment of a circulating water culture system, in particular to a biological filtering device for a moving bed. The biological filtering device comprises a moving bed box body, wherein a biological filter material is arranged in the moving bed box body. The biological filtering device is characterized in that the upper part of the moving bed box body is provided with a water inlet pipe (7) and a water outlet pipe (2), wherein the water outlet pipe (2) and the water inlet pipe (7) are positioned on the left and right sides of the upper part of the moving bed box body respectively; the lower part of the moving bed box body is provided with an air inlet pipe (4); the air inlet pipe (4) and the water outlet pipe (2) are positioned on the same side; the bottom surface of the moving bed box body has a certain inclination degree; one side of the moving bed box body which corresponds to the air inlet pipe (4) is lower, and one side of the moving bed box body which corresponds to the water inlet pipe (7) is higher; the lowermost part of the bottom surface of the moving bed box body is provided with a drain outlet (6) which can be opened and closed; a porous clapboard (5) is arranged above the drain outlet; and the pore diameter of the porous clapboard (5) is smaller than the outer diameter of the biological filter material.

Description

technical field [0001] The invention relates to a biological filtering device of a circulating aquaculture system, in particular to a moving bed biological filtering device. Background technique [0002] The biological filtration equipment of the existing industrialized high-density recirculating aquaculture system has disadvantages such as complex structure, large floor space, high maintenance cost and high energy consumption. The moving bed biological filtration device has the characteristics of high processing capacity, low energy consumption, no need for backwashing, small head loss, good gas-water-solid three-phase mass transfer, and no clogging. It is widely used in industrial wastewater, aquaculture wastewater and domestic sewage. Denitrification and dephosphorization treatment of sewage dephosphorization plants. Its working principle is: the filler with a large specific surface area in the reactor moves freely in the water due to stirring. When the sewage passes con...

AI Technical Summary

Problems solved by technology

[0005] 1. It is impossible to remove the residual bait, fecal solid particle organic matter and exfoliated biofilm in the moving bed biological filtration device. Excessive accumulation of dirt will lead to a decrease in the nitrification capacity of the biological filtration device

[0006] 2. High-density fish farming sometimes results in high oil content in the water, and organic suspended matter such as oil floats in the upper part of the moving bed biological filter device, which is difficult to remove, which will reduce the nitrification efficiency and lead to poor water quality.

[0007] 3. The circulation of biological filter material and water flow in the moving bed box and the poor flow state lead to poor mass transfer effect and poor biological filtration effect

[0008] 4. The aeration hole on the intake pipe is easily blocked by viscous organic matter or other impurities

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