Sewage treatment device and method for net cage culture in large-sized water region

Abstract

The invention relates to a sewage treatment device and method for net cage culture in a large-sized water region. The device is characterized by comprising a dirt collection bucket, wherein the dirt collection bucket is arranged at the bottom of a net cage; the dirt collection bucket is communicated with a blow-off pipe and is connected with a gas-liquid mixer in the middle part; the air discharging opening of the gas-liquid mixer is connected with an air conveying pipe; the drain outlet at the tail part of the blow-off pipe is communicated with a screen net cage; the water outlet of the screen net cage is communicated with a dirt collection tank; the dirt collection tank is internally provided with a biological bacteria film; the air conveying pipe stretches into the dirt collection tank and is connected with an aeration pipe; the aeration pipe is transversely arranged and is located below the biological bacteria film; the dirt collection tank is internally and fixedly provided with a filtering tank; the filtering tank adopts yarn thin silk to filter; the water outlet of the filtering tank is communicated with a biological floating island treatment system; the biological floating island treatment system is fixed on the side face of the dirt collection tank and is internally provided with a water flow channel; aquatic plants are planted inside the water flow channel; and water in the dirt collection tank enters the water flow channel and then is purified and discharged into the large-sized water region.

Description

technical field [0001] The invention relates to a sewage treatment device and method for cage culture in a large water area, belonging to the technical field of aquaculture. Background technique [0002] Large waters, such as lakes, reservoirs, etc., generally carry out freshwater fish farming. For fishermen near these waters, freshwater fish farming is the basic way of their livelihood. However, in recent years, the density of freshwater fish farming in large water areas has increased year by year, and the farming models are all open farming, resulting in serious pollution of water bodies by fish excrement. Once a fish disease breaks out, it will affect the entire water area, and farmers will suffer serious losses. Moreover, large-scale waters are generally open and have a wide range. It is difficult to divide the areas of farmed freshwater fish, and it is also difficult to allocate and fish them. Therefore, at present, many large water areas will concentrate on arranging...

AI Technical Summary

Problems solved by technology

[0004] The actual technical problem to be solved in the present invention is: when cage culture is carried out in a large water area, it is impossible to imitate the cages of industrial fish farming, and the sewage is regularly discharged into the sewer, and the water in the cage can only be discharged regularly into the surrounding waters. Serious pollution of water bodies over time

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