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A combined method of microalgae cultivation and waste gas denitrification

A microalgae and exhaust gas technology, applied in the joint field of microalgae cultivation and exhaust gas denitrification, can solve the problems of application limitations, inability to adapt to high-concentration ammonium salt solutions, etc., and achieve the effect of avoiding mutual influence and reliable operation

Active Publication Date: 2018-08-28
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method will NO x Convert into ammonium nitrate and provide it to microalgae as nitrogenous fertilizer, yet most microalgae cannot adapt to the ammonium salt solution of high concentration, as ammonium sulfate is often used as the inhibitor of microalgae in the prior art, so the method's Applications will be subject to certain restrictions

Method used

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  • A combined method of microalgae cultivation and waste gas denitrification
  • A combined method of microalgae cultivation and waste gas denitrification
  • A combined method of microalgae cultivation and waste gas denitrification

Examples

Experimental program
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Effect test

Embodiment 1

[0070] Use BG11 medium to cultivate Chlorella (purchased from the Institute of Hydrobiology, Chinese Academy of Sciences). Calculated by nitrogen atoms, the content of nitrogen-containing compounds in BG11 medium is 17.6mmol / L, and the temperature is controlled between 20-30°C. Initial concentration OD 680 0.5, feed compressed air and CO 2 The mixed gas for cultivation (CO 2 The concentration is 2-5v%). During the cultivation process, natural sunlight is used for cultivation, and the light intensity during the day can reach up to 60000lux. By controlling CO 2 The amount of feed is used to control the pH of the algae liquid between 7-9, and the OD value of the algae liquid is detected every day. The growth curve is shown in figure 2 Example 1-1. Harvest after 14 days of continuous culture, stop feeding CO 1 day before the end of culture 2 The pH of the algae liquid naturally rises to 9.8 at the end of the cultivation, and then, the algae mud and the alkaline algae culture...

Embodiment 2

[0074] Add KNO to BG11 medium without nitrogen source 3 Obtain the culture fluid of cultured microalgae, be used for cultivating Scenedesmus (purchased from Institute of Hydrobiology, Chinese Academy of Sciences), KNO 3 The addition amount makes in the culture solution of cultured microalgae obtained, in terms of nitrogen atoms, the content of nitrogen-containing compounds is 10mmol / L, the temperature is controlled between 20-30°C, and the initial concentration of algae species OD is 0.5. Compressed air and CO 2 The mixed gas for cultivation (CO 2 The concentration is 2-5v%). During the cultivation process, natural sunlight is used for cultivation, and the light intensity during the day can reach up to 60000lux. By controlling CO 2 The amount of feed is used to control the pH of the algae liquid between 7-9, and the OD value of the algae liquid is detected every day. The growth curve is shown in image 3 Example 2-1. Harvest after 10 days of continuous culture, stop feeding...

Embodiment 3

[0078] Add NaNO to BG11 medium without nitrogen source 3 and sodium bicarbonate to obtain a culture medium for culturing microalgae, which is used to cultivate Monostipella (purchased from the Institute of Hydrobiology, Chinese Academy of Sciences). The amount of sodium bicarbonate added makes the concentration of sodium bicarbonate in the culture medium 100mmol / L. 3 The addition amount makes in the culture solution of cultured microalgae obtained, in terms of nitrogen, the content of nitrogen-containing compound is 20mmol / L, the control temperature is between 20-30 ℃, and the initial concentration of algae is OD 680 0.3, feed compressed air and CO 2 The mixed gas for cultivation (CO 2 The concentration is 2-5v%). During the cultivation process, natural sunlight is used for cultivation, and the light intensity during the day can reach up to 60000lux. By controlling CO 2 The amount of feed is used to control the pH of the algae liquid between 7-9, and the OD value of the alg...

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Abstract

The invention discloses a combined method of microalgae culture and waste gas denitration. The method comprises: (1) providing part of a carbon source for the microalgae culture process by using gas containing CO2 at least; keeping the algae liquid alkali when the culture is finished by means of microalgae metabolism; separating out microalgae from the harvested algae liquid to obtain microalgae and alkali residue; (2) transforming NOx in industrial smoke into nitric acid and / or nitrous acid; and (3) contacting the alkali residue obtained in the step (1) with the nitric acid and / or nitrous acid obtained in the step (2) to obtain a nitrogen-containing neutralized liquid, which provides a nitrogen source for the microalgae culture process. According to the method, 'microalgae culture' and 'waste gas denitration' can be combined reasonably, the microalgae can grow normally with NOx in the waste gas, the NOx can be effectively removed from the waste gas, and mutual influence of 'microalgae culture' and 'waste gas denitration' can be further avoided, so that the two processes can run stably and reliably.

Description

technical field [0001] The invention relates to a combined method of microalgae cultivation and waste gas denitrification. 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 supporting modern human civilization is non-renewable, so countries around the world are stepping up the development of alternative energy technologies; on the other hand On the one hand, when humans process and use fossil energy, they will inevitably produce serious waste gas and sewage discharge problems, which have already caused serious impacts on the climate and human living environment. These problems require a coordinated solution. [0003] Microalgae are highly efficient "living chemical factories" driven by sunlight. Through the efficient photosynthesis of microalgae cells, light energy is converted into chemical energy of carbohydrates such as fat or starch, and...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C12N1/12B01D53/78B01D53/56
CPCB01D53/56B01D53/78B01D2251/10B01D2251/102B01D2251/106B01D2257/404C12N1/12
Inventor 荣峻峰纪洪波朱俊英宗保宁周旭华黄绪耕
Owner CHINA PETROLEUM & CHEM CORP