A method for treating alcohol waste liquid discharged from molasses alcohol factory

Abstract

A method for treating the alcohol waste liquid discharged from the molasses alcohol factory. The alcohol waste liquid discharged from the molasses alcohol factory is separated by a primary membrane; the concentrated liquid after the primary membrane separation is concentrated by a forced circulation evaporator, then concentrated and dried, and finally Use a granulator to make solid particle products; the dilute liquid after the first-stage membrane separation is separated by the second-stage membrane and the third-stage membrane, and the concentrated liquid after the second-stage membrane separation is treated by an evaporative crystallizer, and the solid and liquid are separated after crystallization to obtain Mixed solid salt is recycled; the water obtained after three-stage membrane separation can be reused in the production process without discharge. The invention adopts a series of membrane technologies to treat the alcohol waste liquid, which can remove chloride ions in the waste liquid; adopts the membrane technology to concentrate without heating, and the operating cost is only one tenth of that of steam heating, which has the effect of saving energy and reducing costs. At the same time, a large amount of reclaimed water in the process of the invention is reused in the production process for continuous use, achieving zero discharge and micro discharge.

Description

technical field [0001] The invention relates to the field of chemical industry, in particular to a treatment technology for alcohol waste liquid, in particular to a method for processing alcohol waste liquid discharged from a molasses alcohol factory. Background technique [0002] The molasses alcohol waste liquid is the residual waste liquid that is discharged after the sugarcane juice is fermented with the by-product molasses after boiling sugar crystallization to obtain alcohol. [0003] In the prior art, the above-mentioned alcohol waste liquid is treated by direct evaporation or vacuum concentration into a 55-65% concentrated liquid, and then spray-dried to make a dry powder. The biggest drawback of this traditional process is high energy consumption. The equipment is prone to fouling. During the spray drying process, due to the high viscosity of the material, the nozzle is easy to be blocked, so the equipment is very inconvenient to use, resulting in high labor intensi...

AI Technical Summary

Problems solved by technology

[0005] The object of the present invention is to provide a kind of method for processing the alcohol waste liquid that molasses alcohol factory discharges, and the described method of this processing alcohol waste liquid that molasses alcohol factory discharges will solve the complex process of processing molasses alcohol waste liquid in the prior art , technical problems of high cost and ineffective utilization of recyclables

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