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Micro-nano bubble culture and harvesting integrated microalgae bio-membrane reactor and microalgae culture and harvesting method thereof

A technology of micro-nano bubbles and micro-algae organisms, applied in photobioreactors, methods of supporting/immobilizing microorganisms, bioreactor/fermenter combinations, etc. Difficulty in harvesting algae and other problems, to achieve the effect of reducing hydraulic retention time, increasing growth rate, and reducing floor space

Active Publication Date: 2021-07-13
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, at present, the sewage treatment and nutrient mass transfer effect of microalgae photobioreactors are poor. In order to ensure the efficient utilization of microalgae bioenergy, the problem of microalgae biomass must be solved first, that is, to obtain a sufficient amount of microalgae through cultivation. biomass
In addition, the algae liquid produced after cultivation has a low concentration and is in a suspended state of individual microalgae cells, which brings great difficulty to the harvesting of microalgae. Traditional operations such as flocculation, sedimentation, centrifugation, and filtration are usually time-consuming and labor-intensive. And it is more expensive, which further reduces the overall economic benefits of the system

Method used

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  • Micro-nano bubble culture and harvesting integrated microalgae bio-membrane reactor and microalgae culture and harvesting method thereof
  • Micro-nano bubble culture and harvesting integrated microalgae bio-membrane reactor and microalgae culture and harvesting method thereof
  • Micro-nano bubble culture and harvesting integrated microalgae bio-membrane reactor and microalgae culture and harvesting method thereof

Examples

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Embodiment 1

[0032] Such as figure 2 As shown, the pig farm septic tank biogas slurry was used to cultivate Chlorella vulgaris. Algae cultivation stage: Biogas slurry enters the reaction tank, micro-nano aerated membrane module parameters (bubble diameter is 0.1-50 microns, aeration rate is 0.15-0.2L / min), light intensity parameters (3500-6500lux, light-dark time ratio 12h:12h). When the microalgae biofilm reaches a stable growth stage, the hydraulic retention time is 4-6 days, the concentration of microalgae in the reactor reaches 5-6.5g / L, and the removal rates of dissolved organic matter, total nitrogen and total phosphorus in the wastewater are 75.04- 85.54%, 82.10-86.43%, and 95.23%-97.05%. Microalgae harvesting stage: adjust the parameters of the micro-nano aeration membrane module (the diameter of the bubble is 10-30 microns, and the air flotation time is 5-10 minutes), and the concentrated algae liquid collected by the algae scraper is collected by washing the air-floated microa...

Embodiment 2

[0034] Such as figure 2 As shown, the cow dung fermentation biogas slurry was used to cultivate Chlorella vulgaris. Algae cultivation stage: Biogas slurry enters the reaction tank, micro-nano aerated membrane module parameters (bubble diameter is 0.1-50 microns, aeration rate is 0.15-0.2L / min), light intensity parameters (3500-6500lux, light-dark time ratio 12h:12h). When the microalgae biofilm reaches the stable growth stage, the hydraulic retention time is 5-7 days, the concentration of microalgae in the reactor can reach 4.5-5.5g / L, and the removal rates of dissolved organic matter, total nitrogen and total phosphorus in the wastewater are 65.40 ~75.50%, 75.50~85.50%, and 85.50~95.50%. Microalgae harvesting stage: adjust the parameters of the micro-nano aeration membrane module (the diameter of the bubble is 10-30 microns, and the air flotation time is 5-10 minutes), and the concentrated algae liquid collected by the algae scraper is collected by washing the air-floated ...

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Abstract

The invention discloses a micro-nano bubble culture and harvesting integrated microalgae bio-membrane reactor and an algae culture method. The microalgae bio-membrane reactor comprises a reaction tank main body, a micro-nano aeration membrane assembly, an illumination assembly, a filler, an algae scraping device and the like. Wastewater enters the reaction tank, the micro-nano aeration membrane assembly provides small-diameter carbon dioxide micro-nano bubbles for a microalgae biological membrane, when microalgae are harvested, large-diameter micro-nano bubbles are released through the micro-nano aeration membrane assembly to flush air-floating algae mud, then the algae scraping device harvests the air-floating algae mud, and the reaction tank drains water through the drainage device. The device is high in microalgae culture density and high in pollutant purification efficiency, and integrates microalgae culture and harvesting.

Description

technical field [0001] The invention relates to the technical field of algae cultivation reactors, in particular to an integrated microalgae biofilm reactor based on micro-nano bubble cultivation and harvesting. Background technique [0002] Both energy and water resources are important material foundations for the development of human society, and finding alternative energy sources has become a worldwide concern. At the same time, the recycling of sewage is an important way to solve the water resource crisis, and the further reduction of COD, nitrogen, phosphorus and other nutrients in sewage is the most important thing to be solved when sewage is reused for landscape water and surface water resources. question. [0003] Microalgae have the characteristics of rapid growth and high photosynthetic efficiency, and can effectively use solar energy to convert inorganic nutrients such as nitrogen, phosphorus, and CO through photosynthesis. 2 、H 2 Substances such as O are conve...

Claims

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Application Information

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IPC IPC(8): C12M1/00C12M1/04
CPCC12M21/02C12M25/02C12M41/04C12M29/06C12M31/10C12M23/18Y02W10/37
Inventor 周雪飞张亚雷褚华强杨黎彬蒋淑红孙晶晶徐娇由晓刚于振江尹文俊
Owner TONGJI UNIV