Method for treating aquaculture wastewater

Abstract

The invention discloses a method for treating aquaculture wastewater. The method comprises the following steps of: performing modular processing on wastewater by using microalgae and beneficial bacteria; and throwing snails, filter-feeding fishes and other aquatic animals into a water body to realize self-purification of an aquaculture water environment after the modular processing. Dominant and beneficial microalgae such as diatom, green algae and the like capable of absorbing nitrogen and phosphor in the aquaculture water body are screened out, inoculated, rapidly cultured and put into the aquaculture water body; the water color is regulated and the alga concentration is controlled by the methods of rational fertilization and rotifer inoculation; the beneficial bacteria are bacillus and photosynthetic bacteria capable of degrading organic matters and ammonia nitrogen in the water body; the beneficial bacteria and feed are proportionally mixed before the feed is put into the water body; after the feed is put into the water body, an underwater biomembrane taking the feed as a matrix is formed; the nitrogen, the phosphor and other harmful pollutants in the aquaculture water body can be effectively removed by jointly using the microalgae and the beneficial bacteria; simultaneously, the utilization efficiency of the feed can be improved by mixing the beneficial bacteria and the feed; and the water body is processed by using the microalgae and the beneficial bacteria, and then the snails and the filter-feeding fishes are put into the water body to prevent excessive multiplication of phycomycete, so that the self-purification of the aquaculture water environment can be realized.

Description

Technical field: [0001] The invention belongs to the technical field of sewage treatment, and in particular relates to a method for treating intensive aquaculture sewage. Background technique: [0002] In the past 20 years, the intensive aquaculture industry has developed rapidly at home and abroad. The world's water production reached 120 million tons in 1996, of which 25% were aquaculture. Under these conditions, only about 9.1% and 17.4% of the nitrogen and phosphorus contained in the feed put in during the breeding process are assimilated by the fish, and the pollutants formed by the residual feed and fish excrement will cause serious pollution to water bodies and sediments. , causing the degradation of shallow lakes and causing red tides in some sea areas; the residues of various chemicals and antibiotics used in aquaculture also pollute the water environment, destroy some biological habitats, and interfere with the reproduction and survival of wild populations , so t...

AI Technical Summary

Problems solved by technology

[0004] At present, some physical and chemical treatment technologies, such as sedimentation and filtration, are widely used in my country's aquaculture pollution control technology. However, although the cost of physical and chemical treatment facilities such as sedimentation and filtration is relatively low, they can only remove suspended pollutants in water bodies. substances, and cannot remove dissolved pollutants in water bodies, such as nitrous nitrogen, which is highly toxic to fish, cannot be effectively removed