Closed-recirculation multistage biological purification system

Abstract

The invention relates to a closed-recirculation multistage biological purification system. The system comprises an aquaculture pond. The aquaculture pond is connected with a multistage biological purification canal through a pond discharge canal, the multistage biological purification canal is connected with a purification tank through a water pump water delivery pipeline, the purification tank is connected with a sedimentation tank through a purification canal, and the sedimentation tank is connected with the aquaculture pond through a self-flow canal. By means of the closed-recirculation multistage biological purification system, point purification and face purification of aquaculture water are achieved; after aquaculture pond discharge water passes through the multistage biological purification system, the content of main nutritive salt and the biomass of plankton become low from high, and a significant point purification effect is achieved; meanwhile, in the whole aquaculture period, various indexes of the overall quality of the aquaculture water are kept at a low level, and a significant face purification effect is achieved; a good scientific example is provided for pond aquaculture in brackish water areas of the coast of China.

Description

technical field [0001] The invention belongs to the technical field of eutrophic water body purification, in particular to the eutrophic water body purification technology in aquaculture farms, and in particular is a closed-cycle multi-stage biological purification system. Background technique [0002] Pollution from aquaculture ponds limits the development of aquaculture in the direction of intensification and scale. In order to realize the recycling of aquaculture wastewater, promote the intensification and scale of aquaculture, and ensure the sustainable development of fisheries, it is of great significance to develop suitable pond water environment restoration technologies. [0003] In recent years, with the continuous development of new varieties and new technologies in pond culture in my country, the production and efficiency of culture have been improved. However, it has also brought some adverse effects, which are mainly manifested as: first, the deterioration of th...

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Problems solved by technology

However, it has also brought some adverse effects, which are mainly manifested as: first, the deterioration of the breeding environment, the disease is becoming more and more serious, the sudden and unexplained disease types increase, and the phenomenon of large-scale dead fish occurs from time to time, leading to drug abuse, serious Affect the quality of farmed organisms

The second is serious water pollution, mainly manifested in the serious pollution of total nitrogen and total phosphorus, which limits the sustainable development of aquaculture to some extent.

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