Microfilter suitable for high-density aquaculture

Abstract

The invention discloses a microfiltration machine suitable for high-density aquaculture. According to the microfilter, a baffle is arranged in a box body and divides the internal space of the box body into a filtering area and a sewage discharging area, a filtering rotary barrel is located in the filtering area, one end of the filtering rotary barrel is closed, the other end of the filtering rotary barrel is open, and a water inlet pipe extends into the filtering rotary barrel from the open end of the filtering rotary barrel; the distance between the water outlet end of the water inlet pipe and the closed end of the filtering rotary barrel is one time of the pipe diameter of the water inlet pipe, so that water flow sprayed out of the water inlet pipe hits the closed end of the filtering rotary barrel and impacts the closed end to generate reverse thrust to enable the water flow to flow back, and particulate matters such as fish manure are driven to flow towards the open end of the filtering rotary barrel along with the water flow and then flow into a collector in a sewage discharge area; therefore, the purpose of separating particulate matters such as fish manure is achieved, and the particulate matters such as fish manure are effectively prevented from blocking the filter screen. An aeration pipe is arranged at the bottom of the filtering area, the filtering net can be continuously cleaned through aeration, particulate matter is promoted to flow towards the open end of the filtering rotary barrel, and meanwhile part of carbon dioxide generated by fish breathing can be removed.

Description

technical field [0001] The invention relates to the technical field of water treatment, in particular to a microfilter suitable for high-density aquaculture. [0002] technical background [0003] Aquaculture can provide a high-quality food source and is the fastest growing food industry in the world. The traditional aquaculture model is relatively extensive and the degree of industrialization is low. In particular, the recycling of water and nutrients is not enough. Random discharge will lead to the abundance of surrounding waters. Nutritionalization has a negative impact on the ecological environment and severely restricts the sustainable development of the aquaculture industry. The industrial circulating aquaculture system adopts certain engineering facilities and circulating water treatment facilities to realize the recycling of aquaculture water through appropriate biochemical treatment, so as to achieve high yield, high efficiency, high quality and "near zero" discharge...

AI Technical Summary

Problems solved by technology

However, there are several problems in the common drum microfilters on the market: (1) The filtration area is relatively low, generally about 30% of the drum filter screen area, resulting in a low utilization rate of the filtration area and a large volume of the whole machine; 2) A small part of the drum is immersed in water, and it will be eccentric when rotating, resulting in high power consumption of the motor drive, and the drum is easily deformed and damaged; (3) Particles such as fish feces entering the drum with the circulating water flow are trapped in the filter After the inner surface of the net, it is brought to the upper part by the rotation of the drum along with the surface and inner ribs, and then under the pressure of backwashing water, it falls into the sewage tank and is discharged with the water flow.

This working method is inefficient, only a small part of the particles are accurately discharged in the sewage tank, and most of them are washed back into the drum by the high-pressure water flow; It is broken into fine particles, but it is easier to pass through the filter screen and enter the subsequent process, further reducing the filtration efficiency; (5) The filter screen is easy to clog during high-density farming, requiring frequent backwashing or even manual cleaning, resulting in energy consumption (6) The fish feces that cannot be discharged from the sewage tank or pass through the filter screen have no suitable outlet, and will stay in the water inlet side for a long time, gradually dissolving and aggravating water pollution; (7) There is no function of buffering the pH drop in the breeding process

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