Method for sealing carbon dioxide by using basophilic algae

A carbon dioxide and alkaliphilic technology, applied in chemical instruments and methods, separation methods, dispersed particle separation, etc., can solve the problem of difficult to effectively utilize the characteristics of high bio-oil production of microalgae, limit the application of microalgae carbon fixation technology, and limit biodiesel Development and other issues, to achieve the effect of improving the efficiency of microalgae carbon sequestration, reducing the cost of mineral storage, and improving the net storage efficiency

Pending Publication Date: 2022-03-01
NANJING UNIV +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

On the other hand, the existing research results focus on the production of oil or biofuels after carbon fixation by microalgae. These technologies can achieve carbon reduction to a certain extent, but they cannot achieve carbon sequestration, because algae decompose or burn during death. will convert the originally fixed CO 2 released to the atmosphere again, and the oil production rate of microalgae cells is related to CO 2 The fixation of the usually inverse relationship, resulting in microalgae in the CO 2 In the process of converting into biomass, it is difficult to effectively utilize the high bio-oil production characteristics of microalgae, which not only limits the development of microalgae to produce biodiesel, but also limits the application of the entire microalgae carbon fixation technology to a certain extent.

Method used

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  • Method for sealing carbon dioxide by using basophilic algae
  • Method for sealing carbon dioxide by using basophilic algae
  • Method for sealing carbon dioxide by using basophilic algae

Examples

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Effect test

Embodiment 1

[0039] A method for utilizing alkaliphilic algae to sequester carbon dioxide, comprising the following steps:

[0040] (1) Take the Synechococcus FACHB-805 purchased from the Freshwater Algae Species Bank of the Chinese Academy of Sciences, inoculate it into the eutrophic water body after filtering with a 0.45 micron filter membrane, and inoculate it at 25°C, 2000lux, and the light-dark time ratio of 12h:12h Under these conditions, culture for 20 days, the pH of the cultured algae solution rises to 11.2, and the algae solution is added to the reaction kettle;

[0041] (2) Pass CO into the algae liquid 2 The volume fraction of industrial flue gas is 10%, the rate of flue gas introduction is 1ml / min, and the speed of 300rpm is continuously stirred until the pH value of the algae liquid drops to 9.0;

[0042] (3) dripping the magnesium salt solution that magnesium ion concentration is 0.02mol / L in the algae liquid, its rate of addition is 5ml / min, continuous stirring, when the p...

Embodiment 2

[0046] A method for utilizing alkaliphilic algae to sequester carbon dioxide, comprising the following steps:

[0047] (1) Take Microcystis aeruginosa FACHB-927 purchased from the Freshwater Algae Species Bank of the Chinese Academy of Sciences, inoculate it into eutrophic water after filtering with a 0.45 micron filter membrane, and inoculate it at 25°C, 2000lux, and light-dark time ratio 12h:12h Under the condition of 20 days, the pH of the cultured algae liquid rose to 11.3, and the algae liquid was added to the reaction kettle;

[0048] (2) Pass CO into the algae liquid 2 The volume fraction of industrial flue gas is 10%, the flue gas introduction rate is 3ml / min, and the speed is continuously stirred at 300rpm until the pH value of the algae liquid drops to 9.5;

[0049] (3) dripping the magnesium salt solution that magnesium ion concentration is 0.1mol / L in the algae liquid, its rate of addition is 1ml / min, continuous stirring, when the pH of the reaction solution drops...

Embodiment 3

[0053] A method for utilizing alkaliphilic algae to sequester carbon dioxide, comprising the following steps:

[0054] (1) Take Microcystis blooms FACHB-1028 purchased from the Freshwater Algae Species Bank of the Chinese Academy of Sciences, and inoculate it into eutrophic water after filtering with a 0.45 micron filter membrane, at 25°C, 2000lux, and light-dark time ratio of 12h: Under the condition of 12 hours, culture for 20 days, the pH of the cultured algae liquid rises to 11.1, and the algae liquid is added to the reaction kettle;

[0055] (2) Pass CO into the algae liquid 2 The volume fraction of industrial flue gas is 10%, the flue gas feeding rate is 8ml / min, and the stirring is continued at a rate of 300rpm until the pH value of the algae liquid drops to 8.5;

[0056] (3) Add dropwise a magnesium salt solution with a concentration of magnesium ions of 0.2mol / L in the algae liquid at a rate of 0.5ml / min, keep stirring, and when the pH of the reaction solution drops ...

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Abstract

The invention provides a method for sealing carbon dioxide by using alkaliphilic algae. The method comprises the following steps: by taking the basophilic algae as an absorbent, culturing the basophilic algae through a eutrophic water body to obtain an alkaline solution, absorbing carbon dioxide in industrial flue gas by using the alkaline solution, simultaneously dropwise adding a waste magnesium salt solution into the solution, and reacting to generate an algal carbonate precipitate, thereby realizing mineral sequestration of carbon dioxide. Alkaliphilic algae and eutrophicated water widely existing in the natural environment are used as raw materials, low-cost carbon dioxide sequestration is achieved, and the method is simple, safe, environmentally friendly and easy to implement and has the potential of large-scale application.

Description

technical field [0001] The invention relates to a process for sequestering carbon dioxide by using alkaliphilic algae, which belongs to the technical field of environmental protection. Background technique [0002] In response to the increasingly serious problem of climate change, countries around the world have begun to make carbon neutral commitments. Up to now, 85 countries around the world have proposed carbon neutrality goals, of which 29 countries have specified a carbon neutrality timetable. [0003] On September 22, 2020, my country announced the goal of "strive to peak carbon dioxide emissions by 2030 and strive to achieve carbon neutrality by 2060". On July 16, 2021, the national carbon emissions trading system was officially launched. This series of measures has made carbon neutral technology continue to become a research hotspot in the fields of environment, energy, chemistry, economics (carbon trading, carbon market, etc.). The realization of the goal of carb...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/84B01D53/62
CPCB01D53/84B01D53/62B01D2257/504B01D2258/0283B01D2251/95Y02A50/20
Inventor 张猛龙赵良朱辰徐丹
Owner NANJING UNIV
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