SU1521765A1 - Method for preparing hydrolizate from vegetable raw material for growing yeast - Google Patents

Abstract

The invention relates to yeast hydrolysis production and may find application in enterprises having a yeast production and production of fiberboard. The purpose of the invention is to reduce the cost of the process by reducing wastewater discharge. To the prehydrolyzate obtained by hydrolysis of vegetable raw materials with water, add a fibrous filtrate containing a significant amount of dextrins and products of their partial hydrolysis, which are additionally hydrolyzed with dilute sulfuric acid (inversion). The wood fiber filtrate is obtained by squeezing it. The separated filtrate is fed to the dilution of the mass from the first and second stages of grinding, and its excess is fed to the yeast production. The dehydrated mass is diluted with excess circulating water. 3 tab.

Description

The invention relates to hydrolyzed yeast production and can be used in enterprises that have yeast production and fiberboard production.

The purpose of the invention is to reduce the cost of the process by reducing wastewater discharge.

The method consists in carrying out aqueous prehydrolysis of the raw material and inversion of the prehydrolyzate, and when inverting, the fibrous mass of the filtrate containing significant amounts of dextrins and products of their partial hydrolysis, which are additionally hydrolyzed with dilute sulfuric acid, is introduced into the prehydrolyzate.

The filtrate is obtained as follows.

The pulp obtained on the refiners is pressed, the pressed mass is diluted with circulating water from the casting machines. The filtrate separated from the mass is sent to the filtrate collector and fed to the diluted masses from the first and second grinding stages, and its excess is transported to the inverters and used together with the prehydrolyzate. The resulting neutron inverte is discharged with ammonia, diluted with water.

1HE

H

about:

SP

They are enriched with nutrient salts and served in yeast production.

An example. A production mass of 30% dryness was selected, 1 kg of this mass was diluted with 0.2 l of water from screw feeders, 1.5 l of pulp from a waste-cutting waste basin and 8.04 l of fresh water (fresh water only for the first cycle). The diluted defibratory mass was refined in a laboratory mill (second grinding stage). The resulting mass was pressed up to 40-50% on a laboratory press. The filtrate was collected. For each of the subsequent cycles, another portion (1 kg) of the defibratory mass was diluted in the same way, but the collected filtrate was used in the amount of 8.04 l instead of fresh water. 1.97 L of filtrate was removed from the system after each cycle.

Table 1 shows the characteristics of the filtrate obtained after the 50th cycle ...

As can be seen from the data of Table 1, the PB content is significant and the filtrate can be used for growing yeast. During the inversion, part of the suspended matter hydrates, and the remaining part after inversion is easily settled for 2 hours and the content of the suspension in the 1H-convertible, hydrolyzate after settling is 0.05-1 g / l.

In the laboratories, the yeast culture, Trichosporpn cutaneum, was grown.

The process indicators are given in table 2. ,,

The cultivation was also carried out on a mixture of the filtrate with the prehydrolyzate in a percentage ratio of 13.6: 86.4 (according to

volume). In parallel, control cultivation was carried out on prehydrolyses,

The main qualitative indicators of the prepared substrates, the conditions for the cultivation and the yield of yeast in relation to the amount of PB are given in Table 3.

The use of the proposed method of preparing the hydrolyzate provides, in comparison with the existing methods, the following advantages: expansion of the raw material base for the production of yeast, i.e. use as a raw material, in addition to the prehydrolyzate obtained in the process of aqueous prehydrolyzate during the cooking of cord Cellulose, a filtrate containing organic substances formed during thermomechanical grinding of mass in the production of fiberboard, as well as reducing wastewater discharge by 5.15 plates.

Claims (1)

Invention Formula A method of preparing a hydrolyzate from plant raw materials for growing yeast, which involves water prehydrolysis and inversion of the prehydrolyzate, followed by neutralization, enrichment with food sources and feeding for the cultivation of yeast, o and l and c. so that, in order to reduce the cost of the process by reducing wastewater discharge, in the inversion process a filtrate is obtained in the prehydrolyzate, obtained by compressing the wood-fiber pulp after grinding the second stage and subsequent recycling to dilute the wood-fiber mass after the first and second grinding stages with a content of reducing substances 0,86 - 0,87%. Table 1