Microalgae culture pool-constructed wetland coupling system and method for deep purification of sewage

Abstract

The invention relates to the technical field of sewage purification, in particular to a microalgae culture pond-constructed wetland coupling system for deep purification of sewage. The system comprises a microalgae culture pond and a constructed wetland which are connected in series; microalgae capturing filler is arranged in the microalgae culture pond, algae-containing water obtained after microalgae are captured by the microalgae capturing filler is communicated with the constructed wetland, and part of captured microalgae is introduced into the anoxic denitrification functional area, far away from the liquid level, in the constructed wetland through a flow guide pipe. The method comprises the following steps: culturing microalgae and purifying the sewage in a microalgae culture pool by taking the sewage as a culture medium, carrying out low-cost recovery on more than 80% of microalgae biomass in the microalgae culture pool, introducing a part of microalgae into an anoxic denitrification functional region, far away from a liquid level, in an artificial wetland, and promoting the denitrification effect in the wetland by taking cracked microalgae cells as a carbon source; therefore, the recycling of part of nutrient substances in the sewage is realized, the problems of oxygen supplementation and carbon source deficiency of the constructed wetland are solved in an energy-consumption-free manner, and the removal rate of total nitrogen and total phosphorus is increased.

Description

technical field [0001] The invention relates to the technical field of sewage purification, in particular to a microalgae cultivation pool-artificial wetland coupling system and method for deep purification of sewage. Background technique [0002] The information disclosed in this background section is only intended to increase the understanding of the general background of the present invention, and is not necessarily to be regarded as an acknowledgment or any form of suggestion that the information constitutes the prior art already known to those skilled in the art. [0003] Vigorously developing sewage advanced treatment and reuse technology is an important way to alleviate the shortage of water resources and prevent water pollution. [0004] The resource / energy type microalgae cultivation and sewage deep purification coupling technology combines the growth characteristics of microalgae and the composition characteristics of sewage, and uses the photosynthesis of microalg...

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Problems solved by technology

[0007] Aiming at the technical problem of poor denitrification ability of constructed wetlands in the prior art, the present invention provides a microalgae cultivation tank-constructed wetland coupling system for deep purification of sewage, using sewage as a medium in the microalgae cultivation tank Realize the cultivation of microalgae and the purification of sewage, recover more than 80% of the microalgae biomass in the microalgae cultivation pool at low cost, and pass the algae-containing water containing a small amount of microalgae in the microalgae cultivation pool into the artificial wetland; When water enters the surface of the constructed wetland, oxygen production through photosynthesis can strengthen the oxygen supply of the constructed wetland and the oxidation of ammonia nitrogen; a part of the recovered microalgae is passed through the diversion tube into the anoxic denitrification functional area far away from the liquid surface in the constructed wetland, and enters The algal cells in the deep layer of the wetland lyse and die due to unfavorable conditions. The lysed algal cells are used as a carbon source to promote denitrification in the wetland. In summary, the maximum nitrogen removal is achieved.

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