JP5137637B2 - Agricultural sterilization filter - Google Patents

Description

  The present invention relates to an agricultural sanitizing filter that captures pathogenic bacteria present in agricultural water and suppresses the propagation of pathogenic bacteria thereafter.

Agricultural water, especially water used for hydroponics, is a very important factor that affects the cultivation situation. In this water, when tap water is used, contamination with pathogenic bacteria is relatively small. However, when irrigation water or groundwater is used, pathogenic bacteria are likely to be contained in the raw water. The pathogen propagates through water and becomes ill when it adheres to the cultivated product, which has a serious adverse effect on the cultivated product. For example, root rot propagates through the circulating nutrient solution, infecting the roots of the cultivated product, and causing damage to most cultivated products. As a filtering method for minimizing this adverse effect, there are a method of sterilization by eluting a sterilizing component such as silver from a filter into a nutrient solution, and a method of capturing bacteria with a microfiltration membrane. The method of eradicating bacteria by eluting the sterilizing component such as silver is a method in which the silver ions eluted in the nutrient solution inhibit the reproductive function of the pathogenic bacteria and kill the pathogenic bacteria. Moreover, the microbe-capturing method using a microfiltration membrane is a method for removing microbes in a nutrient solution passing therethrough with a microfiltration membrane with high accuracy.

However, the sterilization method for eluting sterilizing components such as silver into the nutrient solution is difficult to control the elution amount of silver and varies in effectiveness. In addition, when a large amount of silver ions are eluted in the nutrient solution, it may cause phytotoxicity to the roots and inhibit the growth of the cultivated product, and at the same time may shorten the effective life.

On the other hand, although the microbe-capturing method using a microfiltration membrane has a very high ability to capture pathogenic bacteria, it cannot flow a large amount of water because the flow rate per unit area is small. In addition, since the membrane itself has no sterilizing performance, the captured pathogenic bacteria may propagate there and become a lesion. Furthermore, since the filter has high accuracy, there is a problem that nutrients contained in the nutrient solution may be removed (captured).
Nothing

In order to solve the above problems, the present invention can instantly capture pathogenic bacteria in a nutrient solution and suppress the propagation of pathogenic bacteria by attaching an inorganic silver antibacterial agent to a filter mainly composed of chemical pulp. Providing an agricultural sanitizing filter that is effective in sanitizing pathogens that cause blight, root rot, etc. that occur during cultivation of crops such as rice, flowers, fruits, etc. It is intended.

  The agricultural sterilization filter according to claim 1 for achieving the above object comprises a chemical pulp, a hot-melt synthetic fiber, and an inorganic silver antibacterial agent, and the inorganic antibacterial agent is the hot-melt synthetic filter. It is characterized by being uniformly attached to the surface of the fiber.

  The agricultural sanitization filter according to claim 2 is the composition according to claim 1, wherein the chemical pulp content is 40 to 80 wt%, and the hot-melt synthetic fiber content is 20 to 60 wt%. It is characterized by that.

  Moreover, the agricultural sanitization filter according to claim 3 is characterized in that, in the configuration according to claim 1 or 2, the absolute filtration accuracy is 10 μm or less.

According to the agricultural sterilization filter of claim 1, consisting of chemical pulp, hot melt synthetic fiber and inorganic silver antibacterial agent, the inorganic antibacterial agent is uniformly on the surface of the hot melt synthetic fiber It is attached. For this reason, the chemical pulp spreads in the lateral direction due to the water pressure, the filter mesh becomes smaller, and pathogenic bacteria can be efficiently captured by the hot-melt synthetic fiber. Propagation of the captured pathogen is suppressed by an inorganic antibacterial agent uniformly attached to the surface. Furthermore, since the inorganic antibacterial agent has no elution of antibacterial components, its effect lasts for a long time.

The agricultural sanitizing filter according to claim 2 has the chemical pulp content of 40 to 80 wt% and the hot-melt synthetic fiber content of 20 to 60 wt% in the configuration according to claim 1. Since there are relatively many chemical pulps that capture antibacterial agents, the trapping efficiency of pathogenic bacteria is increased. In addition, the heat-melt fiber suppresses the propagation of pathogenic bacteria due to the effect of the inorganic silver antibacterial agent evenly adhered to the surface, and at the same time allows a large amount of water to pass through without causing a large pressure loss to smooth the flow of water. it can.

  In this case, if the chemical pulp content is less than 40 wt%, the sterilization rate decreases, and if it exceeds 80 wt%, the instantaneous flow rate decreases. In addition, if the content of the hot-melt synthetic fiber is less than 20 wt%, the strength of the filter may be reduced and the pressure may be deformed by water pressure, and if it exceeds 60 wt%, the bacteria capture efficiency is reduced.

According to the agricultural sterilization filter described in claim 3, in the configuration according to claim 2, since the absolute filtration over-accuracy is 10 μm or less, pathogenic bacteria of 10 μm or more can be treated with chemical pulp and hot-melt synthetic fiber. Can be reliably captured.

(Example)
A non-eluting inorganic silver-based antibacterial agent 3 wt%, chemical pulp 67 wt%, hot melt synthetic fiber 30 wt% of 3% slurry was prepared, a suction machine was allowed to act on the slurry, inner diameter 42 mm, An agricultural sterilization filter having a wall thickness of 12 mm, a length of 250 mm, and an absolute filtration accuracy of 10 μm was obtained. Here, the non-eluting inorganic silver-based antibacterial agent means one having an elution amount of 0.05 ppb or less. The chemical pulp is a fiber obtained by dissolving lignin from a fiber taken out of wood using chemicals such as sulfuric acid or heat and taking out only the fiber.

(Comparative Example 1)
An agricultural sterilization filter similar to the example was obtained except that the composition was 3 wt% non-eluting inorganic silver antibacterial agent, 97 wt% chemical pulp, and 0 wt% hot melt synthetic fiber.

(Comparative Example 2)
An agricultural sterilization filter similar to the example was obtained except that the composition was composed of 3 wt% non-eluting inorganic antibacterial agent, 0 wt% chemical pulp, and 97 wt% hot-melt synthetic fiber.

(Comparative Example 3)
An agricultural sterilization filter similar to the example was obtained except that the composition was non-eluting inorganic silver antibacterial agent 0 wt%, chemical pulp 70 wt%, and hot-melt synthetic fiber 30 wt%.

(Comparative Example 4)
An agricultural sterilization filter similar to the example was obtained except that the composition was 3% by weight of non-eluting inorganic silver antibacterial agent, 85% by weight of pulp and 15% by weight of hot-melt synthetic fiber.

(Comparative Example 5)
A sanitary filter for agriculture similar to the example was obtained except that the composition was 3 wt% of non-eluting inorganic silver antibacterial agent, 30 wt% of pulp and 67 wt% of hot-melt synthetic fiber.

(Comparative Example 6)
Except that the absolute filtration accuracy was 20 μm, an agricultural sterilization filter similar to the example was obtained.

Each agricultural sterilization filter F obtained by the above Examples and Comparative Examples 1 to 6 is installed in the filter housing 2 of the sterilization apparatus 1 as shown in FIG. 1 and FIG. root rot (Pythium helicoides) instantaneous flow rate when passed through bacteria solution ^{(1.0 × 10 3 cfu / ml} ), total flow rate (filter life flow rate), pressure drop, the sterilization rate and the filter surface after the bacterial liquid passing The number of bacteria was confirmed. The results are shown in Table 1.

As shown in Comparative Example 2 and Comparative Example 5 in Table 1 above, when the chemical pulp content is less than 40 wt%, the sterilization rate decreases by about 20%, which is shown in Comparative Example 1 and Comparative Example 4. Thus, when it exceeds 80 wt%, not only the instantaneous flow rate decreases but also the number of bacteria on the filter surface increases. Further, as shown in Comparative Example 1 and Comparative Example 4, when the content of the hot-melt synthetic fiber is less than 20 wt%, not only the pressure loss increases due to the deformation of the filter but also the amount of the antimicrobial agent attached decreases. Therefore, when the number of bacteria on the filter surface increases and exceeds 60 wt% as shown in Comparative Example 2 and Comparative Example 5, the bacteria capture efficiency decreases, and thus the sterilization rate after passage decreases. As shown in Comparative Example 6, when the absolute filtration accuracy is 20 μm, the bacteria capture efficiency is lowered, so that the sterilization rate after passage is lowered.

As a result, according to the product of the present invention, the chemical pulp efficiently traps pathogenic bacteria, and the non-eluting inorganic silver-based antibacterial agent attached to the surface of the hot-melt synthetic fiber suppresses the propagation of pathogenic bacteria. The sterilization rate after passing is very high, and the filter itself is less likely to become a lesion.

It is the block diagram which illustrated the disinfection apparatus. It is explanatory drawing which showed the use condition of the disinfection filter for agriculture.

Explanation of symbols

F Agricultural disinfection filter 1 Disinfection device 2 Filter housing

Claims (3)

  Agricultural sterilization filter comprising chemical pulp, hot melt synthetic fiber, and inorganic silver antibacterial agent, wherein the inorganic antibacterial agent is uniformly attached to the surface of the hot melt synthetic fiber .   2. The agricultural sterilization filter according to claim 1, wherein a content of the chemical pulp is 40 to 80 wt% and a content of the hot-melt synthetic fiber is 20 to 60 wt%.   3. The agricultural sterilization filter according to claim 1, wherein absolute filtration accuracy is 10 μm or less.

Images