Method for cultivating chlorella by utilizing anaerobic fermentation broth of starch processing wastewater

Abstract

The invention discloses a method for cultivating chlorella by utilizing anaerobic fermentation broth of starch processing wastewater. The method includes the following steps: (1) performing pre-treatment on starch production wastewater after anaerobic fermentation to obtain starch anaerobic fermentation wastewater, performing pre-treatment on acidified organic wastewater to obtain wastewater acidizing fluid, and adding the wastewater acidizing fluid into the starch anaerobic fermentation wastewater to obtain a culture solution; (2) performing habituated culture on the algae grown in an artificial medium; and (3) performing cultivation with a photobioreactor, and performing temperature control, pH control, CO2 aeration control and hydraulic retention time control. The method realizes the resource recovery of wastewater, and as the chlorella is taken as an excellent biodiesel raw material, resources can be recycled; wastewater can be treated in a low-energy way, so that environments canbe protected, and the carbon emission reduction of high concentrated organic wastewater treatment and the resource recycling of nutrient elements can be realized in a whole process; and therefore, thechange of high concentrated organic wastewater treatment from simple pollutant removal to resource recycling can be realized.

Description

technical field [0001] The invention relates to a method for cultivating chlorella by utilizing starch processing wastewater anaerobic fermentation liquid, and belongs to the technical field of microalgae cultivation. Background technique [0002] Oil-producing microalgae have the advantages of short growth cycle, fast growth rate, and high oil yield, and are good materials for biodiesel production. However, the large-scale cultivation of oleaginous microalgae still faces a series of technical and economic difficulties, among which sustainable water resources and nutrient element supply are the two main problems faced by its large-scale cultivation. The lack of water resources and the non-renewable limiting phosphorus element make it impossible to maintain large-scale oleaginous microalgae cultivation only relying on artificial medium. [0003] A potentially feasible way to find cheap alternative freshwater resources and nutrients from waste for microalgae cultivation. Was...

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Problems solved by technology

[0006] In order to solve the technical problems existing in the cultivation of chlorella in the existing starch processing wastewater, the present invention aims at the risks faced by the application of wastewater microalgae cultivation engineering, and conducts outdoor engineering application research. Systematic research was carried out on material yield, oil improvement strategy and pollutant removal, and a method for cultivating Chlorella using anaerobic fermentation broth of starch processing wastewater was proposed

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