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.