The invention relates to a method of anaerobic
fermentation for
alcohol lees liquid and the device thereof. The invention comprises a <double current> method and two
fermentation devices. The
alcohol lees liquid is separated into supernatant and
sediment after precipitating, according to parallel <double current> method, the
sediment enters a
sediment anaerobic
fermentation tank after being blended, and the supernatant enters a supernatant anaerobic fermentation tank after being blended; under specified working conditions, the sediment is performed anaerobic fermentation of hydrolization, acidification and
methanation, and the supernatant is performed
methanation anaerobic fermentation; a part of digestive juice in the sediment fermentation tank is flowed back to be blended and the other part flows into the supernatant fermentation tank, the digestive juice of the tank enters a clarification tank, digest
sludge is precipitated, to flow back to be blended, and the supernatant is performed subsequent treatment; the excess
sludge at the bottom of the two tanks is discharged aperiodically; water distributors are installed on the fermentation tanks, a
water jet pump is collocated for feeding feed liquid, the
mass transfer of the anaerobic fermentation and the
heat transfer efficiency are enhanced, the invention is energy and investment conservation, and can increase the
biogas output and enhance the removal rate of COD. The invention is suitable for treating organic
wastewater in a way of anaerobic fermentation.