RU120014U1 - FILTER CARTRIDGE FOR WATER DISINFECTION - Google Patents

Abstract

1. A filter cartridge for water disinfection, containing a cylinder made of expanded polypropylene, equipped with a through channel located along its central axis, along its entire length there are holes for draining purified water, characterized in that additionally its entire surface is covered with wound on it with a cord 5 mm in diameter made of hydrophilic polypropylene fiber with a fiber size of 5-60 microns, applied to individual fibers by fusion with silver microparticles measuring 5-20 nm with a total area of at least 20% of the entire surface of the polypropylene fiber. ! 2. The cartridge according to claim 1, characterized in that its surface can be covered with a double layer of cord.

Description

Utility model relates to filter cartridges for water disinfection

Known modified filter element from a carbon non-woven fabric impregnated with an aqueous-organic solution of nanostructured silver particles, which allows you to filter out the microbiological impurities contained in water (RF patent No. 2135262, published on 08.27 1999). The main disadvantage of this device is the low disinfection efficiency.

Also, a filter is known in which for the disinfection of water as a filtering material is used a backfill of activated carbon pretreated with silver nitrate AgNO ₃ (RF patent No. 2023662 publ. 30.11.94 g). The disadvantage of this filter is its high cost and limited time of use, due to the low mechanical abrasion resistance and low sorption resource of the material.

It is known to use silvered activated carbon in water disinfection filters (RF patent No. 2402484, published on 04/02/2010). The described filter composition has good bactericidal properties and high mechanical abrasion resistance. The disadvantage of this filter material is the high cost, which is due to the complex technology of its production.

Closest to the proposed is a filter cartridge for purifying water from mechanical impurities, made in the form of a cylinder of foamed propylene, equipped with a through channel for the removal of purified water, located in its central part. Also, openings for the passage of purified water are made over the entire surface of the channel. The disadvantage is the limited scope due to the possibility of purifying water only from mechanical impurities. (Household water purification devices, Poseidon-1 series, TU3697-022-56447948-2005)

A new technical task is to improve the operational characteristics of the cartridge, allowing to expand its functionality due to the ability to disinfect water.

To solve this problem, a filter cartridge for water disinfection containing a cylinder made of expanded polypropylene, equipped with a through channel located along its central axis along its entire length, has openings for removing purified water, and its entire surface is covered on the outside with a cord with a diameter of 5 mm from hydrophilic polypropylene fiber with a fiber size of 5-60 microns deposited on individual fibers by fusion with silver microparticles of size m 5-20 nm with a total area with a total area of at least 20% of the entire surface of the modified polypropylene fiber. Also, the surface of the cartridge may be coated with a double layer of the cord.

The cartridge depicted in FIG. 1 consists of a cylinder 1 made of foamed polypropylene, equipped with a cleaned through channel 2 for discharging water located along its central axis, additionally covered over the entire surface with a cord 3, 5 mm in diameter, made of hydrophilic polypropylene fiber with a fiber size 5-60 microns coated with fibers by fusion with silver microparticles 5-20 nm in size.

The bactericidal property of the filter is realized when purified water passes through a layer formed by a cord of silver-modified hydrophilic polypropylene fiber. With the ability of the prototype filter to pass 3 liters of water per minute, the diameter of the bactericidal cord 5 mm is optimal for disinfecting water. Silver microclusters with a particle size of 5-20 nm with a total area of at least 20% of the entire surface of the modified polypropylene fiber are deposited into single fibers of a bactericidal cord by melting. When the packing density of the fibers with a fiber size of 5-60 μm in the cord is 50 mg / cm ³ , the silver concentration in it reaches 0.5 mg / cm ³ . Such a concentration per unit volume of the bactericidal layer of the filter is sufficient to effectively neutralize all intestinal bacteria and halve the total microbial number from 700 / cm ³ (KMAFAnMKOE / cm ³ ) to 320 / cm ³ , with a standard of 500 / cm ³ . The “washability” of silver ions from the surface of silver clusters is 0.00017 mg per liter of purified water, which, at a flow rate of 200 liters per day, provides a working resource of the bactericidal layer of the filter for 3 months. The choice of polypropylene fiber with a fiber size of 5-60 microns as the basis for bactericidal cords is justified by the fact that it is a chemically and biologically inert material, is not susceptible to microbiological decomposition and is able to maintain strength for a long time when in water.

The cartridge works as follows. Water passing through the bactericidal layer of the cartridge formed by wound on the outer surface of the cord made of hydrophilic polypropylene fiber coated with silver microparticles is disinfected and enters the layer of foamed polypropylene. As a result of the appearance of microturbulent eddies of water between the fibers of the cord, an electrostatic interaction of charged particles of inorganic microcontaminants with “dead” organics occurs, which also contains polar groups on its surface. As a result, they coagulate into large-sized (at least 10-20 microns) aggregates of organo-inorganic nature, which are retained by the material of the cartridge made of foamed polypropylene. Further, water purified from mechanical impurities and bacteriological contamination, through holes made in the longitudinal through channel of the cartridge, enters its outlet channel and is removed from the filter.

The technical parameters of the proposed cartridge are based on experimental studies /

For the experiment, model solutions of BGKP (coliforms) were used. Bacteriological analyzes were performed at the Federal State Budget Scientific Institution TNIIKiF Testing Laboratory of Natural Healing Resources ROSS RU.0001.21PC37

Example 1

A cartridge made of foamed polypropylene was placed in the filter housing for water purification. The housing was screwed with a cover with holes for supplying the water to be treated and its removal after cleaning. A model aqueous solution with a concentration of intestinal bacteria — BGKP (coliforms) 800 CFU in 100 cm 3 and a total microbial number of 700 / cm ³ — was pumped. The inlet pressure corresponded to the water supply - 20 m water column. Pump flow rate - 5 l / min. At the exit of the pressed polypropylene filter, the yield of purified water was 3 l / min, which corresponded to the filter data sheet.

As a result of the purification, the concentration of intestinal bacteria in the purified water remained almost unchanged, and the total microbial number decreased to 580 cm ³ .

Example 2

A cartridge made according to the proposed technical solution was placed in the housing for a household filter for water purification, according to which the surface of the cartridge was coated with a single layer of a cord with a diameter of 5 mm from hydrophilic polypropylene fiber, coated by fusion with silver microparticles with a particle size of 5-20 nm. Casing screw cap, after which, on the input supplied by the pump model solution at a concentration of intestinal bacteria (coliforms) 800 cfu in 100 cm3 and obschemikrobnym number of 700 cm ^3. The inlet pressure corresponded to the water supply - 20 m water column. Pump flow rate - 5 l / min. At the outlet of the upgraded filter, the rate of outlet of purified water was 2.5 l / min, which is 0.5 liters less than the passport rating for a pressed polypropylene filter manufactured by the industry.

As a result of filtration, intestinal bacteria were not detected in the water that was purified, and the total microbial number decreased to 320 / cm ³ at a rate of 500 / cm ³ .

Example 3

A cartridge made of foamed polypropylene coated with a double layer of a cord with a total layer thickness of 10 mm made of hydrophilic polypropylene fiber in 5-20 nm silver particles melted into it was placed in the housing of a household filter for water purification. The total height of the bactericidal layer formed on the outer surface of the cartridge is 10 mm. The case was screwed up with a lid and a model solution with a concentration of intestinal bacteria BGKP (coliforms) of 800 CFU in 100 cm3 was applied to the pump inlet at a standard of 500 CFU in 100 cm3 and a total microbial number of 700 / cm ³ . The inlet pressure corresponded to the water supply - 20 m water column. Pump flow rate - 5 l / min. At the outlet of the filter tank, the output flow rate of purified water was 1.7 l / min, which was almost two times lower than the performance of the filter with a foam polypropylene cartridge.

As a result, intestinal bacteria were not detected in the filtered water, and the total microbial number decreased to 120 / cm ³ at a rate of 500 / cm ³ .

Comparative results of experiments on water disinfection using the proposed cartridge are shown in graph 1. Applications, from which it is seen that the growth of the bactericidal layer of the cord enhances the effectiveness of disinfection, but reduces the yield of purified water.

Thus, the use of the proposed cartridge in the filter for water purification contributes to the expansion of its functionality, namely its use not only for purification of water from mechanical impurities, but also to carry out its effective disinfection.

Claims (2)

1. Filter cartridge for disinfecting water, comprising a cylinder made of foamed polypropylene, equipped with a through channel located along its central axis, along its entire length of which openings are made for the removal of purified water, characterized in that its entire surface is coated on the outside with wound on it with a cord with a diameter of 5 mm from a hydrophilic polypropylene fiber with a fiber size of 5-60 microns deposited on individual fibers by fusion with silver microparticles of 5-20 nm in size nd of not less than 20% of the entire surface of the polypropylene fiber. 2. The cartridge according to claim 1, characterized in that its surface can be covered with a double layer of the cord.