Method for removing nitrate nitrogen from aquaculture water

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...

AI Technical Summary

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 the nitrification biological filter in the breeding system

Adding biodegradable polymers (BDPs) alone as a carbon source for heterotrophic denitrification still has the problem of low solid carbon source release efficiency, which seriously restricts the improvement of denitrification efficiency.

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