RU2326549C2 - Method of raw milk purification from lead - Google Patents

Abstract

FIELD: technological process.

SUBSTANCE: method consists in introduction into raw milk, which is contaminated with lead in concentration of (1.1...4.0)±0.1 from maximum permissible concentration (MPC) of sorbent in the capacity of which the polyphepan is used in proportion from 0.3:1000. Purification is performed until concentration of 0.5 MPC and lower. Contact is performed at temperature of 6°C for 5 minutes with mixing. Then raw milk is purified from sorbent by centrifugal method in separator-milk-purifier for cold purification. Method allows to reduce the concentration of lead in raw milk down to (0.28-0.40)±0.1 MPC with degree of purification of (76-90)±1% accordingly.

EFFECT: reduction of lead concentration in raw milk.

2 tbl, 2 ex

Description

The invention relates to the dairy industry, in particular to the purification of raw milk contaminated with lead in a concentration of (1.1 ... 4.0) ± 0.1 MAC, to a concentration of 0.5 MAC and below, which will allow to direct the entire volume of incoming to a milk processing enterprise for raw milk for the development of environmentally friendly dairy products.

Closest to the invention is a method of purification of raw milk from lead, zinc and copper using the sorbent "Biosorb" of plant origin [1]. Research was conducted in two ways. In the first case, the sorbent “Biosorb” was added to natural cow’s milk, after exposure it was filtered through a gauze filter. In the second case, milk was passed through a filter, consisting of a layer of sorbent "Biosorb", placed between gauze filters. The second option turned out to be the most effective. After processing the milk, the lead content in it decreased by 7 ... 13%, zinc by 27 ... 32, copper by 36 ... 41%.

Thus, at present, there is no effective way to purify raw milk contaminated with lead at a concentration of (1.1 ... 4.0) ± 0.1 MAC, to a concentration of 0.5 MAC or lower, which allows directing the entire amount of incoming to a milk processing enterprise for raw milk for the development of environmentally friendly dairy products.

The essence of the invention lies in the fact that the raw milk contaminated with lead in a concentration of (1.1 ... 4.0) ± 0.1 MPC is subjected to purification, the purification is carried out to a concentration of 0.5 MPC and lower, using powder as a sorbent polyphepan in the ratio of 0.3: 1000, the contact is carried out at a temperature of 6 ° C for 5 minutes with stirring, the sorbent is cleaned by centrifugal method on a milk separator for cold cleaning.

The objective of the invention is to develop a method for the purification of raw milk contaminated with lead in concentrations (1.1 ... 4.0) ± 0.1 MPC, to a concentration of 0.5 MAC or less.

The technical result is expressed in a decrease in the concentration of lead in raw milk to (0.28 ... 0.40) ± 0.1 MPC with a degree of purification, respectively (76 ... 90) ± 1%, which will direct the entire volume of milk processing enterprise of raw milk for the development of environmentally friendly dairy products.

The technical result is achieved by using polyphepan powder in a ratio of 0.3: 1000 as a sorbent, contacting at a temperature of 6 ° C for 5 minutes with stirring, cleaning of the sorbent is carried out by centrifugal method on a milk separator for cold cleaning.

The proposed method is as follows: in the raw milk contaminated with lead in a concentration of (1.1 ... 4.0) ± 0.1 MAC, add a sorbent - polyphepan powder in a ratio of 0.3: 1000, the contact is carried out at a temperature of 6 ° C for 5 min with stirring, cleaning from the sorbent is carried out by the centrifugal method on a milk separator for cold cleaning.

Example 1. In raw milk containing lead at a concentration of 1.19 ± 0.1 MAC (0.119 ± 0.029 mg / dm ³ ), add a sorbent - polyphepan powder in the ratio of 0.3: 1000 (0.3 g of polyphepan powder per 1 dm ³ milk), the contact is carried out at a temperature of 6 ° C for 5 minutes with stirring, the sorbent is cleaned by centrifugal method on a milk separator for cold cleaning.

In purified milk, the lead content is determined by inversion voltammetry on a TA-2 device according to GOST R 51301-99.

Table 1 The lead content in the raw milk and milk purified by sorbent - polyphepan powder, the degree of milk purification Lead content in raw milk The amount of polyphepan, g / dm ³ Contact Duration, min The content of lead in purified milk The degree of purification% MPC mg / dm ³ MPC mg / dm ³ 1.19 ± 0.1 0.119 ± 0.029 0.30 ± 0.01 5 0.28 ± 0.01 0.028 ± 0.012 76 ± 1

From table 1 it follows that the lead content in purified milk is 0.28 ± 0.1 MAC (0.028 ± 0.012 mg / dm ³ ), the degree of purification is 76 ± 1%.

Example 2. In raw milk containing lead at a concentration of 3.88 ± 0.1 MAC (0.388 ± 0.089 mg / dm), add the sorbent - polyphepan powder in the ratio of 0.3: 1000 (0.3 g of polyphepan powder per 1 dm ³ milk), the contact is carried out at a temperature of 6 ° C for 5 min with stirring, the sorbent is purified by centrifugal method on a milk separator for cold cleaning.

In purified milk, the lead content is determined by inversion voltammetry on a TA-2 device according to GOST R 51301-99.

Information sources

1. Kapustin A.A., Frampolskaya T.V. Purification of dairy raw materials by sorbents of plant origin // Valeology. 2001. No1. S.62-63.

table 2 The lead content in the raw milk and milk purified by sorbent - polyphepan powder, the degree of milk purification Lead content in raw milk The amount of polyphepan, g / dm ³ Contact Duration, min Lead content in purified milk The degree of purification,% MPC mg / dm ³ MPC mg / dm ³ 3.88 ± 0.1 0.388 ± 0.089 0.30 ± 0.01 5 0.040 ± 0.009 90 ± 1

From table 2 it follows that the lead content in purified milk is 0.40 ± 0.1 MAC (0.040 ± 0.009 mg / dm ³ ), the degree of purification is 90 ± 1%.

Claims (1)

The method of purification of raw milk contaminated with lead, including the introduction of sorbent in the raw milk, purification from the sorbent, characterized in that the raw milk contaminated with lead is purified at a concentration of (1.1 ... 4.0) ± 0.1 MPC, cleaning is carried out to a concentration of 0.5 MPC and lower, polyphepan powder is used as a sorbent in a ratio of 0.3: 1000, contact is carried out at a temperature of 6 ° C for 5 min with stirring, purification from the sorbent is carried out by centrifugal method on a separator milk cleaner for cold cleaning.