Method for promoting microalga growth and oil production by utilizing iron element in flue gas of coal-fired power plant

Abstract

The invention discloses a method for promoting microalga growth and oil production by using an iron element in flue gas of a coal-fired power plant. The method comprises the following steps of (1) washing and collecting fly ash particles in the flue gas in a microalga culture process; (2) adding hydrochloric acid, and reacting for 1.5-2.5 hours at the temperature of 80-100 DEG C, so that iron oxide particles are converted into ferric ions which can be absorbed and utilized by microalgae; (3) adding a complexing agent into a solution obtained after the reaction in the step (2), thereby converting iron into complexing-state iron; and (4) adding a solution obtained in the step (3) into a microalga culture medium to enable the final mass concentration of the iron element to be 1.0-10.0 mg L<-1>, and culturing the microalgae. According to the method, the iron element in the flue gas is collected, converted and utilized, the oxidation-state iron which cannot be absorbed by the microalgae isconverted into the ionic-state iron, then the complexing agent is added, and the ionic-state iron continues to be converted into the complexing-state iron which is more beneficial to absorption and utilization by the microalgae, so that the improvement of the oil yield and the oil production efficiency of the microalgae can be effectively promoted.

Description

technical field [0001] The invention belongs to the field of microalgae biotechnology and resource recycling, and in particular relates to a method for promoting the growth and oil production of microalgae by using iron element in the flue gas of a coal-fired power plant. Background technique [0002] Coal combustion is the global CO 2 A major source of emissions that have severe negative impacts on the global climate and ecosystems. Carbon dioxide in the flue gas of coal-fired power plants can be used as a source of microalgae growth, and the use of flue gas can help reduce carbon dioxide emissions. Microalgae grows fast, and its carbon dioxide utilization efficiency is 10 times that of terrestrial plants. In addition, various components such as lipids and carbohydrates in microalgae are raw materials for the production of biodiesel, bioethanol and health products. Therefore, the use of CO-containing 2 Flue gas extraction is an economical and environmentally friendly pro...

AI Technical Summary

Problems solved by technology

In the process of cultivating microalgae with coal-fired flue gas, some toxic components in the flue gas, such as SO X and NO X etc. will be brought into the microalgae cultivation system, which will adversely affect the cultivation of microalgae

At the same time, the study found that the ash in the flue gas will also affect the growth of microalgae. For example, when the ash concentration in the medium is higher than 200mg / L, the biomass yield of microalgae decreases; when the ash load reaches 500mg / L, The growth rate of microalgae was also significantly affected

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