Anoxic-aerobic-algae three-stage circulation treatment system for breeding sewage

Abstract

The invention discloses an anoxic-aerobic-algae three-stage circulation treatment system for breeding sewage. The breeding sewage enters a water collection pool, and filtration is performed by using agrid in the water collection pool to remove large particles of suspended matter in the breeding sewage; and organic matter in the breeding wastewater is decomposed in an anoxic treatment pool and anaerobic treatment pool, part of total nitrogen is also removed through nitrification and denitrification, myriophyllum verticillatum and microalgae further convert the total nitrogen and phosphorus-containing inorganic matter in the sewage into own organic matter through photosynthesis, so that high-density high-biomass and high-grease accumulation is realized, a large amount of oxygen is releasedinto an algae purification pool, and maintaining of a higher content of dissolved oxygen in the algae purification pool is facilitated; and branches and leaves falling from microalgae and myriophyllum verticillatum in the algae purification pool are recycled in time to prevent the branches and leaves falling from the microalgae and the myriophyllum verticillatum from decaying to reduce the dissolved oxygen in the water, so that the myriophyllum verticillatum and the microalgae are always in a rapid growth state, and finally, the fast and efficient removal of the total nitrogen and total phosphorus from the breeding sewage and recycling of resources are realized.

Description

technical field [0001] The invention belongs to the technical field of sewage treatment, in particular to a three-stage anoxic-aerobic-algae circulation system for treating aquaculture sewage. Background technique [0002] With the development of society and the advancement of science and technology, the large-scale livestock and poultry breeding industry is developing rapidly. With the development of livestock and poultry breeding, livestock and poultry manure and domestic sewage have become important domestic pollutants. At present, my country's livestock and poultry breeding industry produces About 3.5 billion tons of livestock and poultry manure, according to the "First National Pollution Source Census Bulletin" published in February 2012, COD and ammonia nitrogen emissions from livestock and poultry farming accounted for 95.8% and 78.1% of agricultural source COD and ammonia nitrogen emissions. The environmental problems brought by the livestock and poultry breeding indu...

AI Technical Summary

Problems solved by technology

[0003] In the prior art, AO sewage treatment technology is often used to treat aquaculture sewage. This method can degrade most of the ammonia nitrogen in the aquaculture sewage, but the removal effect on total phosphorus and total nitrogen is poor.

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