High-efficiency nitrogen and phosphorus removal system for treating aquaculture tail water

Abstract

The invention provides a high-efficiency nitrogen and phosphorus removal system for treating aquaculture tail water. The system comprises a tail water treatment biological filter, suspended filler, a direct current (DC) anodic-cathodic array combination, an electric stirring device and a carbon source replenishment device, wherein the suspended filler is arranged in the tail water treatment biological filter; the DC anodic-cathodic array combination is arranged at the upper part of the tail water treatment biological filter; the electric stirring device is arranged at the lower part of the tail water treatment biological filter; a sludge bucket is arranged at the bottom of the tail water treatment biological filter; the electric stirring device is arranged above the sludge bucket; the carbon source replenishment device is connected with the tail water treatment biological filter by means of a pipeline; the volume ratio of the suspended filler to water body in the tail water treatment biological filter is equal to 20-50%; the density of the suspended filler is 0.92-0.98g / cm<3>. The high-efficiency nitrogen and phosphorus removal system for treating the aquaculture tail water has the advantages of being high in nitrogen and phosphorus removal treatment efficiency and small in land occupancy area, does not need an air pump for oxygenation, is energy-saving, low in cost, free from secondary pollution, simple and convenient in management, and the like.

Description

[0001] 【Technical field】 [0002] The invention relates to an efficient nitrogen and phosphorus removal system for treating aquaculture tail water. [0003] 【Background technique】 [0004] my country is a big aquaculture country, and its aquaculture production accounts for about 68% of the world's aquaculture production, of which pond aquaculture production accounts for about 45%. However, the tail water of pond aquaculture and industrial aquaculture is basically discharged directly without treatment. Because the tail water of aquaculture generally contains high nitrogen and phosphorus, it leads to varying degrees of eutrophication pollution to the surrounding water environment. In order to protect the ecological environment of the water area, both governments at all levels and the society require the treatment of aquaculture tail water, so that the water quality of the discharged water can meet the relevant national environmental protection requirements, such as the "Freshwate...

AI Technical Summary

Problems solved by technology

The current pond aquaculture tail water or factory aquaculture tail water treatment technology mainly adopts artificial wetland technology, ecological pond technology and comprehensive application of chemical assisted phosphorus removal technology, such as aluminum chloride (PAC) assisted phosphorus removal for nitrogen and phosphorus removal, Although it has a certain denitrification and phosphorus removal effect, it has a large area, low denitrification and phosphorus removal efficiency, high operating costs, poor treatment effect stability, and secondary pollution if a large amount of chemical agents are used for a long time. question

Due to limited land area and high treatment costs, many aquaculture farms fail to carry out tail water discharge treatment, pollute the surrounding water environment or face the problem of being forced to stop production due to environmental protection failure

[0005] In addition, when the existing electrode is electrolyzed, the surface of the anode iron is easily passivated by the dense covering layer formed by oxides, resulting in the failure of electrolysis and the need for regular cleaning or replacement, which will lead to regular interruption of production and affect work efficiency. It also generates new waste water and increases costs

Images