Method for ecologically purifying nitrogen and phosphorus in surface sediment of aquaculture system

Abstract

The invention provides a method for ecologically purifying nitrogen and phosphorus in surface sediment of an aquaculture system. By using the ecological niche and life characteristics of benthic diatom and filamentous algae and through biomass proportioning and vital activity of the benthic diatom and filamentous algae, the aims of efficiently, economically and environment-friendly purifying nitrogen and phosphorus in the sediment surface layer and overlying water in an aquaculture environment are achieved.

Description

technical field [0001] The invention relates to a method for ecologically purifying nitrogen and phosphorus in surface sediments of an aquaculture system, belonging to the field of aquaculture. Background technique [0002] Earthen ponds, cofferdams, dams and other breeding areas in my country's coastal areas have poor water exchange capacity, long breeding time, and a large amount of waste generated during the breeding process, such as residual bait, excrement and feces, biological debris and other substances. The long-term accumulation and metamorphic deposition of a large amount of waste will have serious adverse effects on the bottom and sedimentary environment of the breeding area. At the same time, the reverse desorption and dissolution of pollutants in sediments or the resuspension of pollutants in water bodies will cause secondary pollution to the water environment. [0003] Through searching, we found that there are few reports on sediment nitrogen and phosphorus p...

AI Technical Summary

Problems solved by technology

The long-term accumulation and metamorphic deposition of a large amount of waste will have serious adverse effects on the bottom and sedimentary environment of the breeding area

At the same time, the reverse desorption and dissolution of pollutants in the sediment or the resuspension of pollutants in the water body will cause secondary pollution to the water environment.

[0003] Through searching, we found that there are few reports on sediment nitrogen and phosphorus purification methods, and found that a few of them accelerate the release of nutrients such as nitrogen and phosphorus in sediments into the water through the bioturbation of benthic animals, and then use algae to absorb nutrients in the water. In order to achieve the purpose of purifying nitrogen and phosphorus pollution in sediments

However, the disadvantage of this type of treatment method is that the algae used are mainly planktonic algae or large sheet algae, which usually live on the water surface, and the nitrogen and phosphorus released are mostly concentrated in the overlying water on the surface of the sediment, so the used It is difficult for the algae to fully absorb the nitrogen and phosphorus in the sediment-water interface; in addition, due to the disadvantages that the biomass of planktonic algae is difficult to control and utilize, and the growth of sheet algae is limited by the season and the environment, it is very easy to rot, Not suitable for harvesting and difficult to manage, so its actual effect is not ideal, resulting in high cost and low efficiency