SU971464A1 - Process for producing bactericidal sorbent for purifying potable water - Google Patents

Description

(5) METHOD FOR OBTAINING BACTERICIDE SORBENT FOR CLEANING WATER DRINKING

 . 1 The invention relates to a method for producing sorbents for purifying drinking water and can be used in filters for purifying drinking water at home and in places of public use (in canteens, schools, on passenger ships, etc.). A known method for producing a bactericidal sorbent involves the impregnation of active carbon by immersing it in a solution of silver nitrate, followed by treatment with an S% solution of sodium chloride and air drying fl. The disadvantage of this method is the high consumption of silver. In addition, the bactericidal sorbent is quickly processed due to the fact that the solubility of silver chloride is higher than the solubility of metallic silver. The closest to the proposed method to the technical essence and the achieved result is a method of obtaining a bactericidal sorbent for the purification of drinking water, including the impregnation of activated carbon by immersing it in silver nitrate solution at a 1: 1 ratio of impregnating solution and carbon with a moisture content less than 5% and the subsequent drying of the impregnated coal. The content of silver on carbon is 0.01-0.3 C —J The disadvantage of this method is a decrease in the degree of purification due to the deep penetration of silver into the fine pores of the active carbon. When water is filtered through the bactericidal sorbent obtained by this method, silver is slowly removed from the fine pores. The aim of the invention is to increase the degree of water purification. The goal is achieved by the fact that when carrying out the method of obtaining a bactericidal sorbent, including the impregnation of active carbon with a solution of silver nitrate and subsequent drying, impregnation is subjected to active carbon with a moisture content of 10-15 and the solution and coal are taken in a volume ratio of 1: 3,, 8.

The method is carried out as follows.

Crushed activated carbon moisture 10-15 impregnated with an aqueous solution of silver nitrate at a ratio of the volumes of the solution and coal. Impregnated coal is dried.

Example. 1000 cm of crushed BAU-A carbon with a particle size of 3.6 to 1.0 mm and a moisture content of 10% is impregnated by spraying 283 cm of an aqueous solution containing 0.33 g of silver nitrate with constant stirring. The ratio of the volumes of the impregnating solution and the coal is 1: 3) 5- The impregnated coal is calcined in a rotary kiln at 450-500 C.

Similarly, BAU-A activated carbon with a moisture content of 5–15, 20% is treated. .

The results of the analysis of water filtered through samples of bactericidal sorbent obtained by the proposed and known methods are shown in the table.

As can be seen from the table, the sorbent obtained by treating active carbon with a moisture content of 10–15% silver nitrate solution has the best bactericidal effect with a ratio of the latter and coal of 1: 3, 8. With this treatment, silver is deposited in the larger pores of the active carbon and when filtering water through the resulting

sorbent provides greater contact with silver ions.

When coal is treated with less moisture, silver is deposited in shallower, deeper pores and is slowly removed from them upon contact with the water being cleaned, which leads to incomplete treatment of the bactericidal sorbent when the filter blend is completely worked out.

When coal is treated with a moisture content of more than 15%, the impregnation process slows down and the impregnated coal is made wet, which results in a loss of silver during the calcination of the coal in the furnace.

When processing coal with an optimum humidity of 1 p-15% by volume of the impregnating solution with a large optimum (W: T 1: 3), silver solution is lost in the stages of obtaining a bactericidal sorbent.

The processing of coal with an optimum moisture content of 10–15% by volume of the impregnating solution, which is less than optimal () is not technological due to uneven impregnation of coal.

Thus, using the proposed method of obtaining a bactericidal sorbent for purifying drinking water provides the following advantages compared to known methods: increasing the degree of water purification by increasing the bactericidal effect of the sorbent, eliminating silver loss with the impregnating solution in the process of obtaining a bactericidal sorbent, using silver completely such a sorbent, which is especially important in the acute shortage of silver as a precious metal.

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Claims of the invention, TIR.NI coal with a moisture content of 10-15% f in the method of obtaining a bactericidal ratio, 8. sorbent for drinking water purification, sources of information,

including the impregnation of active carbon 5 taken into account in the examination of silver nitrate solution and 1, Japanese Patent No. 51 33b08, following drying, distinguishing cl. 91C, 1976. so that, in order to increase the temperature of 2. Japan Patent No. 52-3866, it is subjected to purification and impregnation is subjected to ak- | pi) cells. 91 +3 1977 (prototype).

than the solution and coal take in bulk

Claims (1)

Claim A method for producing a bactericidal sorbent for purifying drinking water, comprising impregnating activated carbon with a solution of silver nitrate and subsequent drying, characterized in that, in order to increase the degree of purification, they are impregnated with ac 971464 8. thawed coal with a moisture content of 10-15%, moreover, the solution and coal are taken in a volume ratio of 1: 3.5 “3.8.