Device for treating nitrogen-and-phosphorus-rich wastewater by utilizing microalgae

Abstract

The invention discloses a device for treating nitrogen-and-phosphorus-rich wastewater by utilizing microalgae. The device comprises a sedimentation tank and a microalga culture tank fixed above the sedimentation tank through a support frame, wherein a plurality of culture units which are arranged side by side are arranged in the microalga culture tank, and each culture unit is formed by enclosingtwo membrane assemblies which are arranged face to face; each membrane assembly comprises a supporting layer, a water storage layer and a filtering layer, and further comprises an annular wall fixedlyconnected with the supporting layer; microalgae are laid on the filtering layers for culture; a central pipeline is arranged in the microalga culture tank, penetrates through each culture unit and the whole microalga culture tank, and is provided with a through hole at each culture unit; two ends of the central pipeline respectively communicate with the sedimentation tank through pipelines, and water inlet pumps are arranged on the pipelines; two ends of the central pipeline are respectively connected with an aeration device through air pipes, and pneumatic butterfly valves are arranged on the air pipes; water outlets are formed in the two ends of the microalga culture tank respectively; and electromagnetic valves are arranged at the water outlets.

Description

technical field [0001] The invention relates to a device for treating nitrogen-phosphorus-rich wastewater by using microalgae, which belongs to the technical field of sewage purification. Background technique [0002] The excessive discharge of domestic sewage, nitrogen and phosphorus-rich aquaculture wastewater and industrial wastewater has caused serious excess of N, P and organic carbon in natural water bodies. N, P and other elements are the main pollutants of water eutrophication. Although the existing sewage treatment process can remove most of the nitrogen and phosphorus in the water body, a small amount of residual N and P will still cause eutrophication of the water body. At the same time, the current chemical and biological sewage treatment processes have problems such as large footprint, long residence time, low removal rate, and high cost. Therefore, it is of great significance to seek a nitrogen-phosphorous-rich wastewater treatment device with high efficiency...

AI Technical Summary

Problems solved by technology

In addition, traditional microalgae culture methods need to be carried out in water bodies

Due to the small cell size of microalgae, large cell water content, cell density close to water, and low culture concentration, the microalgae harvesting process requires a lot of energy to separate microalgae cells and water. Traditional microalgae cultivation methods microalgae The harvesting energy consumption accounts for 20% to 30% of the total energy consumption of microalgae cultivation

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