RU1790433C - Sorption charge of potable water filter - Google Patents

Abstract

The load contains, vol.%: Activated carbon in Ad-form 10-25, modified natural zeolite of monoclinic structure 20-50, activated carbon - the rest. 2 tab.

Description

The invention relates to chemical technology, particularly to the field of conditioning drinking water, and can be used to purify water from various harmful impurities, including impurities of heavy ions and radioactive metals.

A known sorption charge for purifying drinking water based on natural zeolites. Its disadvantage is that it does not provide bactericidal purification of water and is ineffective for purifying water from divalent heavy metal cations such as strontium or cadmium.

The closest in technical essence and the achieved effect is the sorption loading of the filter for drinking water purification, including activated carbons of the BAU and BAU type in silver form.

The disadvantage of this charge is that sleep, providing purification of drinking water only from extraneous tastes and odors due to the presence of organic impurities, is not effective for purifying water from heavy metal ions.

The aim of the invention is to increase the degree of purification of water from heavy metal ions.

The goal is achieved by the described sorption charge for the purification of drinking water containing activated carbon (AC), a silver form of AC and an additionally modified natural zeolite of monoclinic structure with parameters

gratings: a 7,, 39 A; , 85-17.87 A:

,, 79 A. ft 88.10-88.40 ° in sodium and / or potassium form with the following ratio of components, vol.%: Activated carbon in silver form 10-35 Modified zeolite 20-50 Active carbon Else

A distinctive feature of this download is that it additionally contains a modified natural monoclinic zeolite with the parameter

WITH

 oh oh

4 CJ

iw

;

with

lattice frames:, 36-7.39 A; , 85-I7.87

AND; 74 + 15.79 A; / 88.1088.40 ° in sodium and / or potassium form with the following ratio of components, vol.%: Activated carbon in silver form 10-35 Modified zeolite 20-50 Active carbon Remaining Sorption charge due to the use of modified natural Zelex brand zeolite KM-4 makes it possible to achieve an unexpected effect, not described in the literature, that increases the degree of purification of drinking water from divalent metal ions, for example, strontium or cadmium, by 2-5 times in comparison with the initial zeolites. Selex KM-4 sorbent is obtained by treating natural monoclinic zeolites with solutions of sodium and / or potassium hydroxides, followed by heat treatment at 400-600 ° C.

As a result of this modification, a change in the lattice of zeolite with

41, 89A; c 15.75A; , 48 ° for naturalclinoptilolite to

. 36 + 7.39 A; B 17.85 + 17.87 A; with

15, 79A; / 88.10 + 88.40 ° for Selex KM-4.

Apparently, these structural changes lead to an increase in the selective properties of the modified zeolites with respect to divalent heavy metal cations.

The described method is illustrated by the following examples.

PRI me R 1 (prototype). Drinking water containing trace amounts of cesium -137 and strontium -85 radionuclides (10 Ci / l each) and 0.01 mg / l cadmium is each passed through two parallel-connected columns with a volume of 100 cm3 each. As the sorption charge in the first column, a bactericidal sorbent is used — a silver form of BAU activated carbon; in the second - active carbon BAU. This sequence of sorbents simulates the purification of drinking water on a commercially available household filter Rodnik-7. Water is filtered through columns at a speed of 4-5 l / h, the filtrates are fractionated and the cleaning coefficients and the life of the sorbents for each microcomponent are determined. The results of sorption water purification are given in table. 1.

PRI me R 2 (analog). The process is carried out as in example 1, but as a load using a mixture of active carbon BAU, active carbon BAU in silver form and

natural clinoptilolite (Dzegvi deposit) with the ratio AU: AU-Ad: Cl 30: 30: 40 vol.%.

PRI me R 3. The process is carried out as in example 2, but as a load using a mixture of coals BAU and a zeolite monoclinic structure brand Selex KM-4 in sodium form, with the ratio AU: AU-Ad: Selex-KM- 4 70:10:20 vol.%. The results are shown in table 1.

Example 4. The process is carried out as in example 2, but a mixture of BAU coals and a zeolite of monoclinic structure Selex KM-4 brand in potassium form is used as a load, with the ratio AU: AU-Ad; Selex-KM-4 15:35:50 about. %

Example 5. In two cylindrical polyethylene cartridges with a volume of 1, 2 l each, interconnected by rubber tubes and having inlet pipes

and water outlet, load the sorbents in the following sequence (in the direction of water from bottom to top):

1st cartridge: 0.8 l of sorbent Selex KM-4 in mixed potassium-sodium form (80% Na ++ 20% and 0.4 l of BAU-Ad;

2nd cartridge: 0.8 L BAU and 0.4 L BAU-Ad. This device, placed in a plastic case, is called the Kr1nsch filter.

Through the aforementioned filter, tap water of the composition was passed, mEq / L: K - 0.10; Na 0.28; Mg 0.82; Ca - 2.10; CI 0.13; - 0.60; NCOz - 2.57. to which radionuclides Cs and

85Sr in an amount of 10 Ci / l and Cd in an amount of 0.01 mg / l, at a rate of 60-80 l / h daily, 40-150 l. Water samples are taken periodically for analysis until 10 m3 of water passes through the filter. Results for

water purification from metal ions are shown in table 1.

After passing 10 m of water in both cartridges determine the total content of radionuclides accumulated in solid

phase. The results of the analysis showed that all activity is in the first filter along the water flow on the Selex KM-4 sorbent, the content of radionuclides in which was 9.3 10 Ci / kg. These results confirm a 90-95% degree of water purification from radionuclides.

The results of the sanitary chemical analysis are shown in table 2 and show that the water passed through the filter.

meets the requirements of GOST for drinking water.

The results of sorption water purification in accordance with examples 1-5 are summarized in table 1.

As can be seen from the above results, loading a household filter Krshsha, along with purification from heavy metal ions, effectively removes microorganisms and pathogenic microflora from water.

Claims (1)

Formula of the invention Sorption filter loading for purification of drinking water containing activated carbon and silver form of active carbon, characterized in that, in order to increase the degree of purification of water from heavy metal ions, it additionally contains a modified natural monocrine zeolite structure with lattice parameters: The results of the sanitary-microbiological study of KrshSh filters. Beginning of the experiment, October 22, 1990, end of March 23, 91. .36-7.39 A; 85-17.87 A; 74o 15.79 A; / 88.10-88.40, in sodium and / or potassium form in the following ratio of components, vol.%: Active carbon in silver form 10-35 Modified zeolite 20-50 Active charcoal Table 1 table 2 Note. Indicators normalized according to GOST: the number of microorganisms in 1 ml (if the index of BGKP) is 100 (3). Continuation of Table 2