Bacteria and algae collaborated method for efficient treatment of aquaculture sewage

Abstract

The invention discloses a bacteria and algae collaborated method for efficient treatment of aquaculture sewage. Bacteria and algae are compounded for use in combination to treat livestock and poultrysewage. The method specifically includes: adopting autotrophic ammonia oxidizing bacteria, autotrophic nitrification bacteria and heterotrophic nitrification bacteria to convert ammonia nitrogen in livestock and poultry sewage into nitrate nitrogen, then introducing the treated sewage into an airlift columnar photobioreactor, and utilizing the microalgae with a preservation number of CCTCC NO:M 2017461 to remove nitrogen and phosphorus and perform biomass accumulation. The method has the beneficial effects that: through the synergistic action of microbial functional bacteria and microalgae, the method rapidly reduces the nitrogen, phosphorus and other pollutants in livestock and poultry sewage, shortens the hydraulic retention time, improves the microalgae biomass accumulation speed, and can acquire a large number of renewable energy sources while treating livestock and poultry sewage.

Description

technical field [0001] The invention relates to the field of sewage treatment, in particular to a method for cooperating with bacteria and algae to efficiently treat aquaculture sewage. Background technique [0002] The history of sewage treatment using microalgae has been traced back for a long time. As early as the 1950s, Oswald et al. proposed the idea of ​​using microalgae to treat sewage. The growth process of microalgae needs to absorb a large amount of nutrients such as nitrogen and phosphorus, which can directly reduce II / The content of pollutants such as N and P in the tertiary effluent, through indirect effects such as fixing carbon dioxide, generating oxygen, and increasing pH, microalgae can also create environmental conditions that can effectively remove residual organic matter and pathogenic microorganisms in the water. In addition, microalgae also have the ability to absorb harmful substances such as heavy metals, therefore, microalgae has a good potential to...

AI Technical Summary

Problems solved by technology

However, microalgal cells are generally smaller than 30 microns, negatively charged, and have a density close to that of water. These characteristics make algal cells in a stable suspension state in water, and it is difficult to achieve natural separation through gravity sedimentation like activated sludge.

As a result, a large amount of algae cells will be lost with the treated water, which not only pollutes the treated water twice, but also makes it difficult to maintain a large amount of biomass in the reactor (generally only 0.2~0.6g / L)

Low culture density leads to low removal efficiency, making the treatment effect less stable

Furthermore, microalgae treatment of livestock and poultry sewage has low tolerance to ammonia nitrogen, which affects growth, resulting in slower removal efficiency of total nitrogen and total phosphorus, and unsatisfactory removal effect on COD

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