A kind of resource treatment method of aquaculture wastewater

Abstract

The invention relates to a resourceful treatment method of aquaculture wastewater. The method comprises the following steps: 1. Introducing the aquaculture wastewater into a flocculation zone, addinga flocculant into the flocculation zone, and carrying out flocculent precipitation under ultrasonic conditions; separating the sludge precipitate to obtain first purified water; 2, introducing the first purified water into a wetland anaerobic zone; enabling the first purified water to pass through a wetland layer, then downwards infiltrating into an anaerobic tank, and carrying out anaerobic treatment for at least 3h in the anaerobic tank to obtain second purified water; 3, introducing the second purified water into an aerobic zone, carrying out micro-nano aeration treatment, and carrying outaerobic action for at least 3h by using aerobic bacteria to obtain third purified water; then, part of the third purified water flows back to the anaerobic tank in the step 2 to be subjected to anaerobic treatment, and the reflux ratio is (1-5): 1. According to the method, organic pollutants, total nitrogen and total phosphorus in the aquaculture wastewater are effectively removed through the synergistic effect, the indexes reach the national emission standard, ecological construction is combined, and resource utilization is achieved.

Description

technical field

[0001] The invention relates to the technical field of wastewater treatment, in particular to a method for resourceful treatment of aquaculture wastewater. Background technique

[0002] Aquaculture occupies a pivotal position in modern economic development, but it also brings challenging environmental pollution problems. The manure discharge produced by the farms causes serious pollution of surface water, groundwater, soil and ambient air, which directly affects people's health. Untreated manure contains a large amount of pollutants. If it is directly discharged or washed into rivers, lakes and reservoirs with rainwater, it will consume a large amount of dissolved oxygen in the water body, making the water body black and smelly, causing water pollution.

[0003] Fecal sewage contains a large amount of nutrients such as N and P, which is one of the important reasons for the eutrophication of water bodies. Discharge into fish ponds and rivers will gradually ki...