System and method for purifying aquaculture wastewater

Abstract

The invention relates to the technical field of wastewater treatment, in particular to a system and a method for purifying breeding wastewater. The invention provides a system for purifying aquaculture wastewater, which comprises an aeration tank, a front-end regulation and biological matrix treatment tank, a three-stage myriophyllum elatinoides constructed wetland and a subsurface infiltration deep treatment tank which are communicated in sequence. The aeration tank is used for improving the dissolved oxygen content of the aquaculture wastewater, so that sufficient oxygen is provided for aerobic microorganisms in the front-end regulation and biological matrix treatment tank; then, nitrogen and phosphorus are adsorbed and degraded through front-end adjustment and a biological matrix treatment pond, meanwhile, substances harmful to growth of myriophyllum elatinoides are intercepted, and normal growth of myriophyllum elatinoides is guaranteed; in the myriophyllum elatinoides constructedwetland, myriophyllum elatinoides is used for absorbing nitrogen and phosphorus in wastewater and adsorbing and enriching heavy metals and toxic and harmful substances at the same time; finally, residual pollutants are treated by the underflow percolation deep treatment tank to obtain effluent meeting the emission standard.

Description

technical field [0001] The invention relates to the technical field of wastewater treatment, in particular to a system and method for purifying aquaculture wastewater. Background technique [0002] Breeding is an important part of my country's agriculture and rural economy. Intensive livestock and poultry breeding has important practical significance in increasing farmers' income and promoting rural economic development. However, the wastewater discharged from large-scale farms is large and concentrated every day, and contains high pollutants such as total nitrogen, total phosphorus, ammonia nitrogen, and nitrate nitrogen, as well as a large amount of suspended solids. If it is discharged directly without treatment, it will pollute the surface water, soil and groundwater, thereby affecting the safety of drinking water in rural areas, and even endangering the health of residents. [0003] Chinese patent CN201920395888.1 discloses a biological reaction system for microalgae t...

AI Technical Summary

Problems solved by technology

The above-mentioned device is mainly for biochemical treatment of aquaculture wastewater, but the treatment capacity is small, the system has poor impact resistance, is easily affected by C / N imbalance, and has high operation and maintenance costs, and it is difficult for the terminal wastewater to meet the discharge standard for a long time.

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