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A micro -bubble cultivation harvesting microalgae biofilm reactor and its microalona culture harvesting method

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: 2022-08-09
TONGJI UNIV
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  • 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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  • A micro -bubble cultivation harvesting microalgae biofilm reactor and its microalona culture harvesting method
  • A micro -bubble cultivation harvesting microalgae biofilm reactor and its microalona culture harvesting method
  • A micro -bubble cultivation harvesting microalgae biofilm reactor and its microalona culture harvesting method

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Embodiment 1

[0032] like 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 aeration membrane module parameters (bubble diameter is 0.1 ~ 50 microns, aeration volume 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 4 to 6 days, the concentration of microalgae in the reactor reaches 5 to 6.5 g / L, and the removal rates of dissolved organic matter, total nitrogen and total phosphorus in the wastewater are 75.04 to 75.04 g / L, respectively. 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 bubbles is 10-30 microns, and the air flotation time is 5-10 minutes), and the concentrated algae liquid collected by the algae scraper by s...

Embodiment 2

[0034] like figure 2 As shown, the cow dung fermented biogas slurry was used to cultivate Chlorella vulgaris. Algae cultivation stage: biogas slurry enters the reaction tank, micro-nano aeration membrane module parameters (bubble diameter is 0.1 ~ 50 microns, aeration volume 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 to 7 days, the concentration of microalgae in the reactor can reach 4.5 to 5.5 g / 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 bubbles is 10-30 microns, and the air flotation time is 5-10 minutes), and the concentrated algae liquid collected by the algae scraper by scouring the air-floating m...

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Abstract

The invention discloses an integrated microalgae biofilm reactor for culturing and harvesting micro-nano bubbles and an algae cultivation method. The microalgae biofilm reactor comprises a reaction tank main body, a micro-nano aeration membrane component, a lighting component, a filler, and an algae scraper. device etc. The wastewater enters the reaction tank, and the micro-nano aeration membrane module provides small-diameter carbon dioxide micro-nano bubbles for the microalgae biofilm. When the microalgae is harvested, the large-diameter micro-nano bubbles are released through the micro-nano aeration membrane module to wash the air-floating algae sludge, and then scrape the algae. The device collects the flotation algae mud, and the reaction tank is drained through the drainage device. The device has high microalgae culture density, high 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 the search for alternative energy sources has become a worldwide concern. At the same time, the recycling of sewage is an important way to solve this water crisis, and further reducing the COD, nitrogen, phosphorus and other nutrients in sewage is the first and foremost solution to be solved when sewage is reused for landscape water and supplementing 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 and phosphorus, carbon dioxide through photosynthesis. 2 , H 2 O ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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
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