SU493530A1 - The method of processing waste sulphite liquor - Google Patents

Description

passing a current of not less than 50 mA / cm through the electrolyzer.

In this way, liquor can be processed on any type of base, as well as residual product of processing liquor into alcohol and yeast (brew, bard).

The readiness of the liquor for its use as an adsorbent can be controlled by the degree of base regeneration, which as a result of the treatment should be at least 40-60%. Visually, this is determined by the rapidity of coagulation and clarification of wastewater containing fats and proteins, when they are treated with a portion of electrochemically treated lye. The adsorption properties of the treated liquor are significantly increased compared to the untreated, as confirmed by the following examples.

Example 1. Electrochemical treatment of 500 ml of liquor with a concentration of solids of 325 g / l (27.86%) was performed in a two-chamber electrolyzer with graphite electrodes and a cation-exchange membrane of the type

MK-40 C, used as a chamber partition.

The effective area of the anode 60 is the size of the anolyte chamber 1X0.6X60 cm. The liquor was recycled at a volumetric rate of 0.7 l / min.

The treatment was carried out in two stages at a temperature of 53-65 ° C.

In the first stage, the current density was

100 mA / cm and a processing time of 40 minutes. On

the second stage is the current density of 150 mA / cm-,

and processing time 225 minutes final pH

product 0.2.

The treated product was filtered through a filter paper. The filtered product was treated with wastewater and a co-mill containing up to 500 ig / l of fat and up to 2000 mg / l of proteins and mineral salts.

The increase in the adsorption properties of the treated liquor in comparison with the untreated can be seen from the comparative data on the degree of water purification (chemical absorption of oxygen — COD — and permanganate oxidation) given in Table. one.

T a b l II c a 1

Example 2. Electrochemical treatment was subjected to 300 ml of liquor with a solids concentration of 23.29%. Electrochemical processing was carried out in the device of Example 1 with only those changes that the anode useful area was 30 cm, and the anolyte chamber was 1X0.6X30 cm in size.

Volumetric liquor recirculation rate 0.5 l / min. Temperature during processing

maintained at about 50 ° C. Electrolysis was carried out at a current density of 150 mA / cm for 2 hours. After filtering 300 ml of liquor, 280 ml of product were obtained, suitable for use as an adsorbent.

Treated wastewater poultry processing plant. The results of processing are presented in table. 2

table 2

Quality indicators

493530

56

The subject of the invention is the current 50-200 mA / cm with decreasing pH

1. The method of processing the spent sulphite fuel cell by means of electrolysis at the anode, 2. A method according to claim 1, characterized in that, in order to increase that the pH of the liquor is lowered by electroplating, the adsorption-coagulating properties of removing the cations of the base of the liquor from it are electroplating through an ion-conducting membrane, for example the anode at a temperature of 50-95 ° C, a raft-cation selective.

liquor to 0.2-1.