Comprehensive utilization system and method for alkali-process cotton pulp black liquor

The invention belongs to the technical field of cotton pulp black liquor treatment, aims to solve the technical problems of high investment, high operation cost and environmental pollution in the prior art, and provides an alkaline cotton pulp black liquor comprehensive utilization system and method based on the technical problems, which comprises a wastewater pool, an air flotation machine, a precision filter, a membrane separation device, a membrane electrolysis device and a membrane concentration device, the input end of the air flotation machine is connected with a wastewater pool through a pump pipe, the output end of the air flotation machine is connected with a crude liquid storage tank, the output end of the crude liquid storage tank is connected with a precision filter, the output end of the precision filter is connected with a black liquid storage tank, the output end of the black liquid storage tank is connected with the input end of a membrane separation device, and the output end of the membrane