Sewage zero-discharge production process for corn starch

Abstract

The invention relates to a corn-starch manufacturing technique, especially the corn starch sewage zero discharge manufacturing technique. It includes the following working procedure that purifying, dipping, milling and sieving, starch milk refining, fu-water treating. In the dipping working procedure, the dipping baiting is used sparse corn steep liquor as the baiting water; the dipped corn is used the process water to feed continuously; in the grinding and sieving, the process water is used when de-embryo mill is working, to clean the embryo, fiber, to make the acid water when the fibril filtering medium is returned to the fifth fiber washing tank; in the starch milk refining, the process water is used as the washing water for the separator, and the filter cloth of the protein vacuum filter; in the fu-water treating, the starch milk dehydration filtrate should be distributary used after revolving, all of the sealing cooling water in the centrifugal pump should be concentrating recycling. In the whole operation procedure, the processing water is formed closed cycle to realize sewage zero discharge, so it can solve the sewage treating problem, and each ton of starch consumes 1.5-2.2 ton of water.

Description

Technical field: [0001] The invention relates to a production process of corn starch, in particular to a zero-discharge production process of corn starch sewage. Background technique: [0002] For a long time, in the process of corn starch production and processing, a large amount of sewage will be produced. At present, most manufacturers in our country are continuing the production technology of Doyle Company in the United States. During the operation of the production process, the water is difficult to be effectively controlled, and the phenomenon of sewage discharge often occurs, that is, a large amount of primary water is wasted. The production cost has been increased to the enterprise, and because of the excessive production, the discharge of sewage has brought great trouble to the environmental protection work. Some starch production is forced by the environmental protection department to deal with fines and invest huge sums of money to build sewage treatment plants, ...

AI Technical Summary

Problems solved by technology

At present, most manufacturers in our country are continuing the production technology of Doyle Company in the United States. During the operation of the production process, the water is difficult to be effectively controlled, and the phenomenon of sewage discharge often occurs, that is, a large amount of primary water is wasted. It increases the production cost of the enterprise, and because of the excessive production, the sewage discharge brings great trouble to the environmental protection work

Some starch production is forced by the environmental protection department to deal with fines and invest huge sums of money to build sewage treatment plants, but both anaerobic and aerobic sewage treatment methods are time-consuming and laborious, and if the control is not good, COD will exceed the standard

In addition, due to the large amount of dry matter in the sewage, it cannot be directly converted into commodities, and the money has caused unnecessary economic losses to the manufacturers.