Culture water secondary filter system

Abstract

The invention relates to a culture water secondary filter system. A water return pipe passing through the bottom of a tank body is arranged in the center of a culture tank, a water return hole is arranged at the lower part of the water return pipe, a spiral biological ball is arranged in the upper part of the water return pipe, culture water pumped by a diving pump arranged at the bottom of the tank enters the culture water secondary filter system from the water return hole at the lower part of the water return pipe, and goes out after being treated by the spiral biological ball arranged in the upper part of the water return pipe, and the water return pipe is communicated with a water level controller arranged outside the tank body through the water return hole for forming a self flowing type water return system. The culture water carries out deep treatment through the invention, nitrogen elements remained in the water body after the biological filtration treatment are removed at high efficiency, a filter bed is used for culturing and gathering nitrite bacteria and nitrate bacteria, and NH4<+> in the water is promoted to be converted into NO2, and is then converted into NO3. The invention can be used for realizing the complete denitrification of the biological treatment, so the treated water body can be reused, and the invention provides powerful support for the realization of full-sealed circulation culture modes.

Description

【Technical field】 [0001] The invention belongs to the technical field of aquaculture water treatment, and relates to a secondary filtration system for aquaculture water used in the aquaculture industry. 【Background technique】 [0002] At present, the aquaculture technology is changing from the traditional model to industrialized aquaculture. In the process of industrialized aquaculture, the most important new technology is the recirculating aquaculture technology. The core of the recirculating water fish farming system is the aquaculture water treatment system, and around the water treatment system, a fish disease prevention and treatment system suitable for recirculating aquaculture is established. [0003] In aquaculture water, pollutants mainly come from fish excrement and bait residues, including four main elements: carbon, nitrogen, phosphorus, and sulfur. The most difficult element to deal with in recirculating aquaculture is nitrogen. [0004] Usually, the COD in sew...

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Problems solved by technology

However, in the process of aquaculture water treatment, due to the lack of anaerobic environment, studies have pointed out that there is no obvious denitrification reaction. 4 + converted to NO 2 , and then converted to NO 3 The process needs to consume oxygen, and the pH will change accordingly

[0005] However, the current circulating water treatment system often only adopts a single biological treatment unit. Due to the limitation of residence time, it often cannot meet the best conditions for denitrification by nitrifying bacteria, and cannot achieve the effect of complete denitrification.

In this case, the aquaculture water still contains nitrogen after treatment. Although NO is not particularly toxic to fish, it will also cause harm to fish when it accumulates for a long time and reaches 60-70 mg / L. As a result, there is no way to truly realize the recycling of aquaculture water in the aquaculture process

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