Suspended sand filter for seawater aquiculture water treatment

Abstract

The invention relates to a seawater aquiculture water treatment technology and discloses a suspended sand filter for seawater aquiculture water treatment. A water pipe (1) is arranged in the center of a cylindrical filter cylinder body (9) of which the lower end is enclosed; the lower end of the water pipe (1) is communicated with a conical diffusion awl (2); gaps are formed between the peripheryof the edge and the filter cylinder body (9); a plurality of rows of micropore aerator pipes (3) are arranged on an upper surface of the diffusion awl (2); a sewage awl (7) is arranged at an upper opening of the filter cylinder body (9); a conical water outlet (4) is formed in the center of the filter cylinder body (9); a flow guide pipe (5) is arranged above the sewage awl (7); a certain distance is kept between the lower part of the flow guide pipe (5) and a conical surface of the sewage awl (7); a sewage outlet (8) is formed above a contact ring between the sewage awl (7) and the filter cylinder body (9); a water outlet (6) is formed on an upper edge of the filter cylinder body (9); and quartz sand is arranged in the space of the filter cylinder body (9). The quartz sand serves as a biological filter material; and due to a unique filter structure, the filter completely meets the requirement of seawater aquiculture water treatment and is suitable for seawater aquiculture treatment comprising low-temperature seawater aquiculture drainage.

Description

technical field [0001] The invention relates to a seawater aquaculture water treatment technology, in particular to a device for treating the water body of a seawater aquaculture system. Background technique [0002] In the process of seawater aquaculture, along with the feeding of feed and the growth of fish, a large amount of harmful substances such as ammonia nitrogen and nitrite will be produced, which seriously affect the normal survival of fish. How to effectively remove molecular ammonia and nitrite in aquaculture water has been studied in depth for many years at home and abroad, and a variety of removal methods and technologies have been formed. At present, most of the biological filtration in the circulating aquaculture system uses the biofilm removal technology, that is, the filter material is used as the growth substrate of nitrosifying bacteria and nitrifying bacteria, and the ammonia nitrogen and nitrite are degraded through the response of the bacteria. , to e...

AI Technical Summary

Problems solved by technology

[0004] 1. Three-dimensional elastic filter material, inclined tube honeycomb filter material, biological ball and Pall ring, etc.: the specific surface area is low, generally 200-500m 2 / m 3 , although the price is cheap (100-300 yuan / m 3 ), but the biological filtration capacity is poor, and it is difficult to withstand a large ammonia nitrogen load

[0005] 2. Coal cinder, ceramsite and biofossil, etc.: Although this type of filter material has a high specific surface area, the internal cavity of the filter material is closed due to the attachment of biofilm, and it is difficult to backwash and clean it. The effective specific surface area is greatly reduced, and it cannot be used stably for a long time

[0006] 3. EPS foam particles: its specific surface area is 650m 2 / m 3 About (particle size 3~8mm), the daily removal rate of ammonia nitrogen is only 50-100g / m 3 , due to the high buoyancy of the filter material, the filter material layer is dense and easy to harden and cause blockage. Regular backwashing is required, and at the same time, the energy consumption is high

[0007] However, due to the particularity of seawater water quality conditions, its salinity, Ph value and ion concentration are very different from freshwater, and the biological filtration capacity of freshwater biological filtration technology and equipment under seawater conditions is only 50% or even lower than the original

Especially low-temperature seawater fish such as flounder and flounder have a low suitable growth temperature, and conventional biofilters have very low removal efficiency of ammonia nitrogen and nitrite in their aquaculture water

[0008] How to effectively remove molecular ammonia and nitrite in seawater aquaculture water is not only very important in the structure and material selection of the filter material, but also has a great influence on the structure of the overall removal device. Chinese patent application 201020554450.2 discloses a Biological fluidized bed filter device for fully enclosed circulating aquaculture, using composite active silica biological carrier, the filter material has a high specific surface area, which can reach 20,000m 2 / m 3 Above, the biofiltration efficiency is high, but the price is high

Because it adopts the laying of water distribution pipes at the bottom of the filter to produce suspension fluidization of the filter material, since it is difficult to keep the flow rate and flow rate of each pipeline consistent, it is easy to cause the stability and uniformity of the fluidization state of the filter material to be poor, and the actual operation is difficult.

At the same time, the original solid suspended particles in the water body cannot be removed by the device, and the density of the biological filter material decreases after the biofilm is excessively attached, and will be taken out of the device by the water flow, which affects the water treatment and purification effect of the device

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