Method for using CO2-containing waste gas in microalgae culture

A technology of microalgae and waste gas, applied in the fields of environmental protection and microalgae cultivation, to achieve the effect of reducing production costs, reducing carbon emissions, and saving costs

Active Publication Date: 2012-07-04
BEIJING FORESTRY UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, no one has combined the tail gas of baking soda factories with microalgae cultivation, which not only solves the carbon source problem of microalgae cultivation, but also solves the energy and environmental protection problems of tail gas emissions from baking soda factories

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] (1) Taking spirulina culture as an example, first prepare Z-culture solution: sodium bicarbonate 16.8g / L, dipotassium hydrogen phosphate 0.5g / L, sodium nitrate 2.4g / L, potassium sulfate 1.0g / L, chlorine Sodium chloride 1.0g / L, magnesium sulfate heptahydrate 0.2g / L, calcium chloride dihydrate 0.04g / L, ferrous sulfate heptahydrate 0.2g / L, disodium EDTA 0.08g / L, mix well. The initial pH value is 8.25, the culture temperature is 25-37°C, and natural light is applied.

[0025] (2) In spirulina farms, the general culture pool is far away from the harvesting workshop and the factory building. The algae liquid in the culture pool is transported to the harvesting workshop for filtration by sewage pumps for spirulina harvesting. After harvesting, the filtrate is pumped from the harvesting workshop. Back to the culture pond, in the process of pumping the filtrate back to the culture pond, use a gas-liquid mixer (manufactured by Haitai Meixin Industry (Beijing) Co., Ltd.) to mix th...

Embodiment 2

[0029] (1) Taking spirulina cultivation as an example, first prepare the Z-culture solution of Example 1: the initial pH value is 8.25, the cultivation temperature is 25-37° C., and natural light is applied.

[0030] (2) In spirulina farms, the general culture pool is far away from the harvesting workshop and the factory building. The algae liquid in the culture pool is transported to the harvesting workshop for filtration by sewage pumps for spirulina harvesting. After harvesting, the filtrate is pumped from the harvesting workshop. Back to the culture pond, in the process of pumping the filtrate back to the culture pond, use a gas-liquid mixer (manufactured by Haitai Meixin Industry (Beijing) Co., Ltd.) to mix the filtrate with the waste gas discharged from the baking soda factory to achieve the purpose of gas-liquid mixed reaction.

[0031] (3) the pH value of the spirulina culture solution is 9.66, the exhaust gas of the sodium bicarbonate factory is mixed with the culture ...

Embodiment 3

[0034] (1) Taking spirulina culture as an example, first prepare the Z-shi culture solution of Example 1, the initial pH value is 8.25, the culture temperature is 25-37° C., and natural light is applied.

[0035] (2) In spirulina farms, the general culture pool is far away from the harvesting workshop and the factory building. The algae liquid in the culture pool is transported to the harvesting workshop for filtration by sewage pumps for spirulina harvesting. After harvesting, the filtrate is pumped from the harvesting workshop. Back to the culture pond, in the process of pumping the filtrate back to the culture pond, use a gas-liquid mixer (manufactured by Haitai Meixin Industry (Beijing) Co., Ltd.) to mix the filtrate with the waste gas discharged from the baking soda factory to achieve the purpose of gas-liquid mixed reaction.

[0036] (3) the pH value of the spirulina culture solution is 9.5, the exhaust gas of the sodium bicarbonate plant is mixed with the culture solutio...

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PUM

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Abstract

The invention provides a method for using CO2-containing waste gas in microalgae culture. The method comprises: introducing tail gas containing CO2 into filtrate obtained after microalgae are harvested; and allowing CO2 to react with sodium carbonate and water to form sodium bicarbonate to regulate the pH value range of the culture solution and the supply of a carbon source, so that microalgae grow quickly and the cost of addition of sodium carbonate is avoided. The production cost of the microalgae can be reduced obviously, and the discharge from sodium carbonate plant can be reduced. And the method can contribute to energy conservation, discharge reduction and climate change relief.

Description

technical field [0001] The invention relates to the field of environmental protection and the field of microalgae cultivation, in particular to a 2 Application method of exhaust gas in microalgae cultivation. Background technique [0002] Microalgae cultivation requires a large amount of carbon and nitrogen sources. For example, the largest amount of carbon source needed for the growth of spirulina is sodium bicarbonate baking soda. The production of each ton of dry algae powder requires about 7-8 tons of baking soda. 40-50% of the total production cost. The traditional method of spirulina cultivation is raceway cultivation, and the agitator in the algae pond makes the algae liquid flow forcedly. A large amount of carbon dioxide carbon source added has dissipated, and the mixing efficiency is extremely low. Furthermore, pipelines are laid in each greenhouse, which greatly increases the production cost and causes a large waste of resources. Therefore, this method has not b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C12N1/12C12R1/89
Inventor 李博生
Owner BEIJING FORESTRY UNIVERSITY
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