Mechanically harvested sugar cane mixing juice membrane cleaning pretreatment method

Abstract

The invention relates to the technical field of sugar production. According to the present invention, a sugar cane mixing juice is subjected to residue removing treatment by using a vibration sieve, the pH value of the filtrate of the vibration sieve is adjusted by heating and adding an alkali, the pH value adjusted filtrate enters a self-cleaning filter or a centrifuge system to remove impurities, and the filtrate of the filter or the centrifuge enters a membrane system; the method is suitable for the sugar cane mixing juice cleaning process using mechanically harvested sugar cane as a raw material, and has advantages of simple and safe operation, no chemical additive and easy continuous production; and the sugar cane mixing juice membrane cleaning pretreatment process uses the vibrationsieve-self-cleaning filter or the centrifuge two-stage integrated filtration technology, such that the grading separation of bagasse and soil in the sugar cane mixing juice is achieved, the problems of filtration mud agglomeration and filter clogging during the sugar cane mixing juice pretreatment are avoided, the continuous operation of the sugar cane mixing juice membrane cleaning process is ensured, and the pollution problem of the subsequent membrane system operation is significantly reduced.

Description

technical field [0001] The invention belongs to the technical field of sugar production, and relates to a method for pretreatment of sugarcane mixed juice, in particular to a method for cleaning pretreatment of sugarcane mixed juice by membrane method for mechanized harvesting. Background technique [0002] The existing sugarcane sugar production process includes sugarcane juice extraction, cane juice clarification and decolorization, scouring, crystallization and other steps. The clarification and decolorization effect of cane juice directly determines the quality of finished sugar. The traditional clarification and decolorization process is to add a large amount of lime and sulfur dioxide (sulfurous acid method) to the mixed juice, or add lime and carbonic acid gas (carbonic acid method), and then separate and precipitate to remove non-sugar impurities in the mixed juice to reduce the color value and turbidity. Therefore, a large amount of waste water, solid waste and by...

AI Technical Summary

Problems solved by technology

However, the sugarcane mixed juice pretreatment method announced by CN105063247A is only for suspended bagasse. If the sugarcane is harvested mechanized, once the soil brought by it enters the microfiltration membrane system, serious membrane pollution will occur, making the filtration unsustainable.

Even if a self-cleaning filter or centrifuge is installed before the membrane filtration system, some long fibers and pectin in the mixed juice will form a filter cake with extremely poor fluidity with the soil, and it is difficult to discharge it out of the system by backwashing or flushing with water, giving The continuous operation of the entire cleaning process brings great problems

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