Method for cultivating oleaginous microalgae by using fecal sewage

Abstract

The invention relates to a method for cultivating oleaginous microalgae by using fecal sewage, which comprises the steps of pretreatment of the fecal sewage, inoculation activation and acclimated cultivation of microalgae, amplification cultivation of the microalgae, accumulation of lipid content of the microalgae, concentration of the microalgae and collection of the microalgae. According to themethod, a liquid which is discharged during the process of feces recycling treatment and conforms to the emission standard is used for cultivating the microalgae so that cultivation water and reagents are saved during the microalgae cultivation, simultaneously, the microalgae can be used without being sterilized, the production process is reduced, the cost of obtaining microalgae biodiesel is reduced, nitrogen and phosphorus in the liquid serve as nutrient materials during the microalgae cultivation, various indexes in the sewage are further reduced, and water quality of the sewage is improved. Besides, biogas produced during the process of feces recycling treatment serve as a heating fuel, carbon dioxide (CO2) separated during biogas purification serve as a carbon source for the microalgae cultivation, the microalgae cultivation and the feces recycling treatment are organically coupled, and energy conservation and emission reduction are promoted while the cost is reduced.

Description

Technical field [0001] The invention relates to the technical field of sewage treatment and environmental protection, in particular to a method for cultivating oil-producing microalgae by using pretreated fecal sewage. Background technique [0002] At present, the greenhouse effect and energy tension are key problems facing the world. Mitigating the greenhouse effect and solving the energy crisis are directly related to the sustainable development of the global economy. Biodiesel is green and renewable, and is considered to be one of the most ideal ways to solve the global energy crisis. However, at present, most of the oil crops used to prepare biodiesel are food crops, such as corn, soybeans, and rapeseed. Biodiesel production methods will inevitably compete with people for food and land, with poor sustainability, high production costs, and difficulties in industrial development. Because microalgae do not occupy arable land, have a high oil content, and can capture carbon whil...

AI Technical Summary

Problems solved by technology

However, due to the complex composition of industrial wastewater and the high concentration of pollutants, the growth of microalgae is often inhibited.

There is also a method (CN 101955846A) for the production of microalgae oil based on the low-carbon emission of domestic sewage, but in order to avoid pollution during the microalgae cultivation process, it needs to be sterilized, which consumes energy

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