Low-energy-consumption sewage treatment method for removing nitrate by utilizing alga photosynthesis

Abstract

The invention discloses a low-energy-consumption sewage treatment method for removing nitrate by utilizing alga photosynthesis, and belongs to the technical field of nitrate removal sewage treatment.The low-energy-consumption sewage treatment method comprises the following specific steps: high-nitrate-resistant denitrifying bacteria are domesticated and prepared; then, high-nitrate sewage and returned activated sludge enter an aeration tank together to form a mixed solution in the aeration tank, organic matters in the high-nitrate sewage are in full contact with the high-nitrate-resistant denitrifying bacteria, and the high-nitrate-resistant denitrifying bacteria treat the high-nitrate sewage; and alga plates attached with alga plants are fixedly mounted on the peripheral side walls of the inner cavity of a sedimentation tank, an environment suitable for the growth of alga plants is built in the sedimentation tank, in the growth process of algae, nitrate and other substances in seawater are absorbed through photosynthesis, nitrate is decomposed into nitrogen and oxygen to reduce the concentration of nutritive salt in seawater. The nitrate purification is achieved through photosynthesis of algae, and the nitrate absorption and purification efficiency is high.

Description

technical field [0001] The invention relates to the technical field of nitrate-removing sewage treatment, in particular to a low-energy-consumption sewage treatment method utilizing algae photosynthesis to remove nitrate. Background technique [0002] Nitrate is an important physical and chemical indicator of water quality in aquaculture. Elevated nitrate content not only indicates the lack of oxygen at the bottom of the pond and the deterioration of aquaculture water quality, but also the cause of aquatic animals' susceptibility to diseases. Most of the current water treatment processes are based on the application of biological Filtration method is used to remove ammonia and nitrate in water. Porous biological filter material is placed in the biofilter, and certain microorganisms are directional cultivated, relying on the autotrophy or heterotrophy of microorganisms to decompose ammonia and nitrate in water. However, the microorganisms of biological filtration are easily a...

AI Technical Summary

Problems solved by technology

However, the microorganisms of biological filtration are easily affected by factors such as the temperature of the water body, the amount of dissolved oxygen, and the pH value, and the effect is slow and unstable, and the energy consumption is relatively high. Plant photosynthesis is the main treatment of aquaculture sewage metabolic waste. Therefore, we propose a low-energy sewage treatment method that uses algae photosynthesis to remove nitrate