PL328182A1 - Disinfecting metallic colloids and method of disinfecting by means of metallic colloids - Google Patents

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METALLIC COLOID DISINFECTING AND METHOD OF DISINFECTION WITH METALLIC COLOIDS

Maciej PIKE-BIEGUŃSKI, Tadeusz SIWIEC, Czesław GRABARCZYK, Lidia RECZEK

The present invention relates to highly dispersed metallic colloids and a method for disinfecting materials and media, especially food grade water, using such metal colloids produced in a liquid.

There are well-known disinfection methods that use chlorine, chlorine dioxide, sodium hypochlorite, chloramines, ozone and others. These methods consist in distributing an appropriate dose of the disinfectant in the disinfected medium, i.e. the dose that will ensure the destruction of undesirable bacterial flora. Although the advantage of such a solution is its effectiveness and long time of disinfecting activity of the added agent, its presence usually adversely affects the organoleptic parameters, which is a particular disadvantage when the disinfected medium is water intended for food purposes.

The disinfection method with the use of quartz lamps producing ultraviolet radiation is known. Such radiation, by affecting the flowing medium, also destroys the bacterial flora. By using the appropriate power of quartz lamps and the appropriate flow velocity, to ensure the right time of exposure to the medium, the required disinfecting effect can be obtained. This method is used in the treatment of drinking water and for economic purposes, and when it is necessary to disinfect durable objects, e.g. objects and tools used in medicine. While this method has proven effective in medicine, in the disinfection of liquid media, despite the advantage of not worsening organoleptic parameters, it has many disadvantages, including: limited efficiency, high cost of the device, high energy consumption and a decrease in disinfecting efficiency in the case of cloudy and cloudy media. tinted. 2

An alternative to the above-mentioned methods can be the use of a highly dispersed metal solution in water.

They are known from patents US 5,437,243 (Process for Fabricating Diamond by Supercritical Electrical Current) and US 5,609,683 (Apparatus for Making Industrial Diamond) and the publication of Pike-Bieguński M.J .: Damages to Electrical Connections by Electrotensiometric Forces. Symposium IICIT, Boston, 1996, USA methods of influencing changes in the structure of bodies by passing a current of appropriate density through them. Such a process can change the body in an integrating manner as demonstrated by graphite and diamond, or breaking the structure as shown by metallic current conductors. When a high-density current flows through a conductor placed in a liquid medium, the conduit is ruptured, creating a mist of fine particles with dimensions of tens of picometers to nanometers, forming a colloid. This effect is obtained when a current with densities of about 106 Acm2 flows through the conductor. It is assumed that the current density in the colloidization region should be in the range of 105 to 3-107 A / cm2.

The method of disinfection with the use of highly dispersed metallic colloids according to the invention consists in adding an appropriate amount of colloid to the disinfected medium.

The disinfection method according to the invention is characterized by the necessity to determine which liquid will be subjected to this process. This information is needed for the preparation of a suitable colloid solution as the colloid must be produced in the same liquid that is to be disinfected. That is, if the water is disinfected, the disinfectant will be a water-based metallic colloid. Of course, the colloid must be made in water with quality parameters not lower than that of disinfected water. The same reasoning applies to other liquids. For the production of a colloid for water disinfection, non-alloy metallic wires are used, such as: silver, copper, chromium and vanadium wires with a length of 2 to 6 cm and a diameter of 0.1 to 1.0 mm, immersed in water through which electric current is passed. with a density of 105 to 3107 A / cm2. In this way, a colloid solution with metal concentrations ranging from 0.1 to 4.0 g / m3 is obtained. The solution prepared in this way is dosed to the water to be disinfected in amounts appropriate to the degree of bacterial contamination. The solution doses for waters with small amounts of bacteria, i.e. with a coli value = 10'1, amount to approx. 5% of the amount of disinfected water. Hence, the metal concentration in the aqueous solution drops to 0.2 g / m3. After mixing and after a waiting time of more than two hours, the number of bacteria in the sample drops below the measurable range. The colloid solution has a long activity time as observed by testing after the four-month retention period of the colloid since its preparation. If it is necessary to disinfect the surface of solids, it is sufficient to cover the surface of the body with a colloid solution by spraying or immersing the body in the colloid solution. 3

The most important advantage of the colloid solution is its disinfecting efficiency, low production cost, durability, no effect on changes in the taste and smell of water and very low concentrations of colloid metal (below micronutrient concentrations) in disinfected water.

Example

In order to demonstrate the disinfecting efficiency of the colloid according to the invention, tests were carried out, among others, on surface water taken from the branch of the Vistula river in the northern part of Warsaw in Bielany. This water was subjected to a physico-chemical and bacteriological analysis and then treated with a silver colloid solution obtained at a current density of 3 · 106 A / cm2 with a silver concentration of 4 g / m3. After adding the colloid in the amount of 50 ml to 1000 ml of disinfected water, the effect of reducing the number of bacteria to a level below the accuracy threshold of the method was obtained. This means that the metal concentration in the mixture was 0.2 g / m3. The results of raw water tests - "S" and disinfected water - "ZD" are presented in Table 1.

Table 1

Designation Unit S ZD Date of analysis 1.04.98 reaction PH 8.31 8.35 color mgPt / dm3 50 55 turbidity FTU 8 10 alkalinity mval / dm3 4.5 4.15 hardness dH 23.3 21.85 oxidizability mg02 / dm3 4 , 7 4.2 calcium mgCa / dm3 131.77 125.0 magnesium mgMg / dmJ 19.5 19.5 potassium mgK / dm3 32.01 9.01 sodium mgNa / dm3 80.0 78.0 iron mgFe / dm3 0 , 33 0.37 manganese mgMn / dm3 0.44 0.22 copper mgCu / dm3 1.27 U3 chlorides mgCl / dm3 123.5 121.0 fluorides mgF / dm3 0.44 0.13 sulphates mgSO4 / dm3 320 360 phosphates mgPO4 / dm3 0.24 0.14 ammonium nitrogen mgNNH4 / dm3 0.5 0.5 nitrite nitrogen mgNNO2 / dm3 0.008 0.006 nitrate nitrogen mgNNO3 / dm3 0.29 0.28 dry residue mg / dm3 760 840 Coli titre I 10 ' 1 0

Claims (5)

328162 Claims 1. Metallic colloid disinfectant solutions consisting of a liquid containing highly dispersed metal particles characterized in that the metals are | silver, copper, chromium and vanadium. 2. Colloid solutions according to claim 1, characterized in that the high degree of metal dispersion in the liquid is achieved by the method of current flow through metal with densities from 105 to 3-107 A / cm2. Colloid solutions according to claims 1 and 2, characterized in that the liquid in which the colloid is produced is the same as the liquid to be disinfected. 4. Disinfection method involving the use of a colloid solution, characterized in that a colloid is added to the liquid to be disinfected in the amount determined by laboratory tests and mixed, and in the case of disinfection of solids, their surface is covered with a colloid layer by spraying or immersing the body in the colloid solution. 5. Disinfection method according to claim 4, characterized in that the mixing of the colloid in the disinfected liquid can be carried out by mixing the liquid in the tank with mechanical agitators or by spontaneous mixing in the colloid dosed to the flowing liquid in a pipeline or an open tray. Signatures