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Method for cultivating microalgae and method for combining it with denitrification of industrial waste gas

A technology of microalgae and algae liquid, which is applied in the field of microalgae cultivation, can solve the problems that it is difficult to match the working conditions of waste gas emission and microalgae cultivation, the recycling of cultivation water, and the inability to meet the requirements of emission reduction, etc., and achieve high effective utilization rate , low decomposition rate, and the effect of improving efficiency

Active Publication Date: 2019-03-08
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Some literatures have disclosed "the method of directing industrial waste gas into the microalgae cultivator for denitrification", but these methods all have the following difficult problems: ①Using microalgae to denitrify industrial waste gas must solve some problems that limit its commercialization, For example, cultivating microalgae requires light and warm climate conditions, and weather changes will inevitably lead to changes in the denitrification efficiency of microalgae. "Directly injecting industrial waste gas" will be difficult to match the exhaust gas emission conditions with the microalgae cultivation conditions, resulting in mutual interaction between the two processes. ② Nitric oxide (NO) is the main component of NOx, and the solubility of NO in water is extremely low, so "directly injecting industrial waste gas" cannot solve the problem that a large amount of NO in NOx is insoluble in water difficult to assimilate
In some cases, it is difficult to recycle the aquaculture water. For example, when metal salts are used as the nutrient source, the recirculation of aquaculture water will cause the accumulation of metal ions in the aquaculture water, resulting in a continuous increase in its salinity, and high salinity usually affects the growth of microalgae. Significant inhibitory effect on growth

Method used

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  • Method for cultivating microalgae and method for combining it with denitrification of industrial waste gas
  • Method for cultivating microalgae and method for combining it with denitrification of industrial waste gas
  • Method for cultivating microalgae and method for combining it with denitrification of industrial waste gas

Examples

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Embodiment 1

[0132] This example is used to illustrate the effect of the present invention when autotrophically cultivating Chlorella.

[0133] The only difference between this example and Comparative Example 1 is that the nitrogen source and its concentration still use the formula of BG11 medium, and when the pH value is higher than 10 in the later stage of cultivation, nitric acid is added to adjust the pH within an appropriate range, and the pH is tested every day OD of algae liquid 680 value, its growth curve see figure 1 .

Embodiment 2

[0135] This embodiment is used to illustrate the effect of the present invention when cultivating Spirulina autotrophically.

[0136] Spirulina (provided by the Institute of Hydrobiology, Chinese Academy of Sciences) was cultured using Z's medium (Table 3, 4 and 5), and the initial concentration of algae was OD 680 When the pH value is higher than 10.5, add nitric acid to adjust the pH within an appropriate range. During the cultivation process, natural sunlight is used for cultivation, and the light intensity during the day can reach up to 60000 lux. Check the OD of the algae solution every day 680 value, its growth curve see figure 2 .

Embodiment 3

[0138] This example is used to illustrate the effect of the present invention when cultivating Chlorella concurrently (without sterilization operation).

[0139] The only difference between this embodiment and Comparative Example 1 is: adopt Chlorella heterotrophic medium (Table 6 and 7), add 2g / L glucose and 0.5ml / L fermented EM every three days in the cultivation process For the bacterial solution, when the pH value is higher than 10, add nitric acid to adjust the pH within an appropriate range. Check the OD of the algae solution every day 680 value, its growth curve see figure 1 .

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Abstract

The invention relates to a method for culturing microalgae and a combined method for denitration of industrial exhaust gas. The culturing method includes: in a medium for culturing microalgae, providing at least one of nitrogen source, phosphorus source and carbon source in the form of alkali metal nutrient salt; and in a culturing process, regulating the pH value of the algae liquid by using nitric acid and / or nitrous acid. The culturing method of the invention can improve the efficiency of microalgae culturing.

Description

technical field [0001] The invention relates to a method for cultivating microalgae and a method for combining microalgae cultivation with denitrification of industrial waste gas. Background technique [0002] Energy" and "environment" are important issues facing human society in the sustainable development of the new century. On the one hand, the fossil energy that supports modern human civilization is non-renewable, so countries around the world are stepping up the development of alternative energy technologies; on the other hand , when human beings process and use fossil energy, they will inevitably produce serious waste gas and sewage discharge problems, which have already caused serious impacts on climate and human living environment. These problems need a coordinated solution. [0003] Microalgae is a highly efficient "living chemical factory" driven by sunlight. Through the efficient photosynthesis of microalgae cells, light energy is converted into chemical energy of...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C12N1/12C12N1/20B01D53/84B01D53/56
CPCY02A50/20
Inventor 荣峻峰朱俊英周旭华纪洪波
Owner CHINA PETROLEUM & CHEM CORP