Method for removing nitrate nitrogen from aquaculture water

A technology for aquaculture water and nitrate nitrogen, applied in anaerobic digestion treatment and other directions, can solve the problems of pH value drop, sulfate content increase, rise, etc., to achieve the effect of easy control of working conditions, reduction of side effects, and stable effluent quality.

Inactive Publication Date: 2008-06-18
SHANGHAI FISHERIES UNIV
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Problems solved by technology

However, the biggest defect of this method is that the added sulfur is oxidized to sulfate, resulting in an increase in sulfate content in the effluent; and it will cause H in the effluent + When the pH value increases, the pH value decreases, which affects the nitrification efficiency of th

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  • Method for removing nitrate nitrogen from aquaculture water
  • Method for removing nitrate nitrogen from aquaculture water

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Embodiment Construction

[0009] The purification mechanism of the present invention is that when the circulating aquaculture water flows through the sulfur / limestone filler layer, Thiobacillus denitrification uses elemental sulfur as the electron donor to perform autotrophic denitrification, reducing the nitrate nitrogen in the aquaculture water to nitrogen, and simultaneously producing a small amount of sulfuric acid Roots and other reaction products, limestone can further increase the alkalinity of aquaculture water while compensating for the alkalinity consumed by the autotrophic denitrification of Thiobacillus denitrificans; When the aquaculture water enters the BDPs carbon source filler and zeolite filler layer, the heterotrophic denitrification bacteria will remove the remaining nitrate nitrogen in the aquaculture water and produce gaseous nitrogen, and the sulfate reducing bacteria will reduce the sulfate radical to hydrogen sulfide; Removing sulfate is a process of increasing alkalinity. Adding...

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Abstract

The invention relates to a method of removing nitrate in aquaculture water, relating to treat aquaculture water. The invention comprises a sulfur autotrophic denitrification and biodegradation polymer carbon source heterotrophic denitrification device, the invention is characterized in that: the sulfur autotrophic denitrification section and the biodegradation polymer carbon source heterotrophic section are series-connected from up to down according to the proportion of 1:1 to form a denitrifying device; after the integrated denitrifying device forms film, the aquaculture water enters from the water inlet of the lower part of the integrated denitrifying device, and flows through the filling layer of the sulfur autotrophic denitrification section from up to down to remove partial nitrate, the remained nitrate in the aquaculture water and the sulfate anion generated in the process of the sulfur autotrophic denitrification section enter the filling layer of the biodegradation polymer carbon source heterotrophic section, so as to remove the remained nitrate in the aquaculture water and also generate gaseous nitrogen, the reducing bacteria of the sulfate reduces the sulfate anion to hydrogen sulfur; the treated aquaculture water flows out from the water outlet of the lower part of the integrated denitrifying device; the gaseous nitrogen and hydrogen sulfur are exhausted from exhaust opening.

Description

Technical field: [0001] The invention relates to aquaculture water treatment, in particular to a method and a device for removing nitrate nitrogen from circulating aquaculture water. Background technique [0002] Biofiltration technology is the core technology of water treatment in aquariums and recirculating aquaculture systems. At present, nitrifying biological filters are installed in the water treatment process of aquariums and recirculating aquaculture systems to oxidize ammonia nitrogen and nitrite nitrogen into nitrate nitrogen, resulting in the accumulation of nitrate nitrogen in the aquaculture system to a relatively high concentration, usually as high as 100mg / L above. Although the toxicity of nitrate nitrogen to the cultured objects is lower than that of ammonia nitrogen and nitrite nitrogen, high concentrations of nitrate nitrogen will also affect the growth of the cultured objects, resulting in slowed growth, reduced survival rate, and decreased immunity. Mediu...

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Application Information

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IPC IPC(8): C02F3/28
Inventor 罗国芝谭洪新车轩
Owner SHANGHAI FISHERIES UNIV
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