A denitrification device for industrialized circulating aquaculture discharge water and its denitrification process

Abstract

The invention relates to the technical field of water treatment, and particularly relates to a factory circulating water aquaculture discharge water denitrification device and a denitrification process thereof. A cylinder of the factory circulating water aquaculture discharge water denitrification device is filled with stuffing, then activated sludge and aquaculture discharge water are added, and membrane-forming start is performed to form a biological membrane; the aquaculture discharge water is injected from an aquaculture water inlet pipe and is stirred, a heat exchanger is started, an aeration head is opened, so as to heat until the water temperature reaches 25 to 30 DEG C, a pH value of the water is adjusted to 7 to 8, the water dissolved oxygen is kept at 2 to 3 mg / L, the water retention time is 2 to 4 hours, then a mixer and the aeration head are closed, the water stands for 0.5 to 1 hour, and the denitrified water is discharged from an aquaculture water outlet pipe. The factory circulating water aquaculture discharge water denitrification device and the denitrification process are suitable for denitrification treatment of factory circulating water aquaculture discharge water which contains a large amount of ammonia nitrogen and nitrate radicals, and environmental pollution caused by the factory circulating water aquaculture discharge water is greatly reduced.

Description

technical field [0001] The invention relates to the technical field of water treatment, in particular to a denitrification device for industrial circulating aquaculture discharge water and a denitrification process thereof. Background technique [0002] With the improvement of my country's industrialized recirculating aquaculture technology, there are more and more intensive farming models with high density and high feeding rate, and 70-80% of the fed feed is finally discharged into the aquaculture water body in the form of dissolved and particulate matter A large amount of feed input and accumulation of fish metabolites lead to the concentration of ammonia nitrogen and nitrate in the discharge water of industrial circulating aquaculture far exceeding the discharge standards of relevant industries. Usually, the concentration of ammonia nitrogen reaches 5mg / L, and the concentration of nitrate reaches 200mg / L. At present, most of these high-concentration nitrogen aquaculture dis...

AI Technical Summary

Problems solved by technology

Although the longer the water body residence time is, the more favorable the microorganisms are for the absorption and transformation of ammonia nitrogen and nitrate, but too long water body residence time will increase the corresponding energy cost

Some research reports have shown that changes in the carbon-nitrogen ratio may change the degree of microbial competition for nitrogen and oxygen. When the influent carbon-nitrogen ratio is low, the organic matter in the wastewater will soon be lacking, and the nitrification and denitrification reactions will be difficult to achieve balance.

[0004] Due to the low carbon-to-nitrogen ratio of industrial circulating aquaculture discharge water, it is necessary to add organic carbon sources to the aquaculture discharge water body when removing nitrate in the water body through denitrification reaction, and adding dissolved organic substances such as methanol, ethanol, and glucose is likely to cause water pollution. Insufficient or excessive carbon content, causing secondary pollution of aquaculture discharge water

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