Method for recycling process water in production of cornstarch

Abstract

The invention discloses a method for recycling process water in the production of cornstarch, which comprises the following steps of: (1) decontaminating corns, soaking the corns with acidic soak solution, performing sewage treatment on evaporation water produced by evaporating the soak solution with vapor, and performing whirling-rinsing with vapor condensate water; (2) roughly grinding the soaked corns to remove embryos, rinsing, squeezing and drying the embryos to obtain dry embryos, and cyclically rinsing the embryos with embryo rinsing water; (3) finely grinding the roughly ground corns to remove fibers to obtain raw starch, rinsing, squeezing and drying the fibers to obtain dry fibers, and cyclically rinsing the fibers with fiber rinsing water; (4) separating the raw starch into starch milk and protein milk, squeezing and drying the protein milk to obtain albumen powder, and rinsing the embryos and the fibers with gluten water produced in the squeezing; and (5) performing multi-stage whirling-rinsing on the starch milk, oven-drying bottom-flow starch to obtain the finished product of the starch, performing protein separation on primary overflow after intermediate condensation and preparing the corn soak solution with the condensate water of the primary overflow.

Description

technical field [0001] The invention relates to the technical field of cornstarch production, in particular to a process water recycling method in cornstarch production. Background technique [0002] The processing process of corn starch is to remove impurities from the corn, soak it at a certain temperature and for a certain time and under acidic conditions, then break and separate the germ, and then go through needle grinding and fiber washing to separate the fiber and wash off the fiber starch. After the milk is washed by swirling, the protein is separated, and the wet starch is dried to obtain dry starch. In the whole production process of corn starch, corn soaking, coarse grinding, fine grinding, washing of germ and fiber after coarse grinding and fine grinding, and swirling washing of starch milk all require a lot of water. Among them, the swirling washing of starch milk plays a key role in the quality and yield of starch during the processing of corn starch. Therefo...

AI Technical Summary

Problems solved by technology

However, a large amount of process water after washing in each process contains a large amount of organic matter and needs to be discharged after sewage treatment. Therefore, the current starch production not only has the problems of large water consumption and high production costs, but also has the problem of heavy sewage treatment burden.

In the current corn starch production process, most of them adopt the "open-loop downstream" washing process, and the dry matter content in the discharged sewage reaches 22 kg / ton of product, which not only has high production costs, but also brings a great burden to sewage treatment.

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