JPH07163820A - Filter bag for inspecting water quality - Google Patents

Abstract

PURPOSE:To filter a large amt. of sampling water on the job site by preparing a filter bag for inspecting water quality of nonwoven fabric with at most specified water permeability and a specified pore diameter. CONSTITUTION:Nonwoven fabric prepd. of a polyester fiber, a polypropylene fiber, etc., with a water permeability of at most 50sec, pref. at most 40sec defined as a water permeability time of 300cc ion-exchanged water per unit area of 23.7cm<2> is used. In addition, the pores existing in this nonwoven fabric have a pore diameter of 15-335mum on average, at most 100mum pref. at most 90mum and are provided with filtering ability. A bag is made by heat sealing, etc., and an adsorbent such as cellulosic powder is put in the bag. Filtering and bringing into contact with are performed on the job site for sampling by using this bag. It is lightweight, portable and repeatedly used.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a filtration bag for water quality inspection.

[0002]

2. Description of the Related Art In the inspection of water quality of sewer water, river water, pool water, etc., depending on the required inspection items, the water to be inspected is collected and virus or When inspecting the presence and quantity of bacteria etc., the collected water is brought back and a rigorous water quality test is conducted. Especially when inspecting for viruses and bacteria, various kinds of water are collected due to different collection points, and as a result, a large amount of heavy water is secured.
Will be transported. Since handling a large amount of collected water itself is a problem, when inspecting for viruses and bacteria, the collected water and the adsorbent of cellulose powder are brought into contact with each other at the site to adsorb the virus and the like to the eyes, A method is known in which a small nylon knitted fabric is filtered, the adsorbent from which filtered water is removed is brought back, and the adsorbent is tested as a sample.

[0003]

However, in the method of inspecting this adsorbent as a sample, when the filter medium is a nylon knitted fabric, the time-dependent deformation due to the load during filtration is large,
Opening occurs, the filtration performance and durability are poor, and in the case of a non-woven fabric with only small meshes, it takes a long time to filter, and a large amount of 18 to 20 liters or various kinds of collected water of several hundred cc that is usually collected is required. At present, there is no filter material that is satisfactory in processing operability and filtering capacity suitable for processing. An object of the present invention is to provide a filtration bag for water quality inspection capable of filtering a large amount of collected water on site.

[0004]

The present invention has a unit area of 2
A filtration bag for water quality inspection composed of a nonwoven fabric having a water flow rate of 300 cc of ion-exchanged water per 3.7 cm ² of 50 seconds or less and a pore size of 15 to 35 μm on average and 100 μm or less at maximum.

The non-woven fabric constituting the bag of the present invention is preferably composed of synthetic fibers such as polyester fiber, nylon fiber, polypropylene fiber and acrylic fiber, more preferably polyester fiber, polypropylene fiber and acrylic fiber, and At least one of the constituent fibers is a non-woven fabric composed of ultrafine fibers having a denier of less than 1 denier.

The method for producing the non-woven fabric is not particularly limited, and may be either a dry process or a wet process, or may be appropriately subjected to a finishing process such as calendering or water absorption. Unit area 23.7 cm as performance
It is necessary that the water passage time of 300 cc of ion-exchanged water per ² is 50 seconds or less, preferably 40 seconds or less. If the water passage time exceeds 50 seconds, it will take a long time for filtration.

In order for the nonwoven fabric to have filtration ability, it is necessary that the pores present in the nonwoven fabric have an average pore size of 15 to 35 μm, and a maximum pore size of 100 μm or less, preferably 90 μm or less. If the average pore size is less than 15 μm, the filtration rate is remarkably reduced, and if it exceeds 35 μm, the water permeability is naturally improved, but the filtration capacity is reduced, and if the maximum pore size exceeds 100 μm, leakage occurs and the collected water is It may flow out as it is or may even flow out of an adsorbent that has adsorbed a virus or the like.

Since the nonwoven fabric is subjected to water load when the collected water is filtered when it is formed into a bag, the mechanical properties of the nonwoven fabric include tensile strength of 8 kg / 5 cm or more and 80% or less in both warp and weft directions. It is desirable and necessary as a minimum requirement to have a breaking elongation of.

When the bag is made of non-woven fabric, it may be sewn. However, when the non-woven fabric itself is partially or entirely made of synthetic fiber, there is a risk of leakage during filtration from the seam. Is preferably heat-sealed into bags. The shape of the bag is not particularly limited, but the bag has a tubular shape or an envelope shape, which is approximately the same size as or larger than the size of the drain port of the collection container for the water to be inspected and has an arbitrary length.

The collected water may be brought into contact with an adsorbent capable of adsorbing viruses and the like in a collecting container, but if the adsorbent is contained in the bag in advance, the adsorbent may be activated or filtered. Occasionally, the contact with the collected water is performed at the same time, and such a method is an operationally advantageous method for the adsorption treatment. The adsorbent contained in the bag is preferably cellulose powder which is effective for adsorbing viruses and bacteria, but other adsorbents other than cellulose powder may be used. When used, the cellulose powder is alkali-treated and activated before use. A flocculant may be added to facilitate the filtration of the cellulose powder that adsorbs viruses and the like.

[0011]

[Example] Polypropylene / polyester Easy-dividable fiber (manufactured by Mitsubishi Rayon Co., Ltd., split fiber K87) 40 wt% polypropylene fiber having a fineness of 0.2 denier
%, Single fiber fineness 0.2 denier polyester fiber 40
Acrylic fiber with wt% and single fiber fineness of 1.5 denier 2
The non-woven fabrics having a basis weight of 55 g / m ² and a fabric thickness of 0.40 mm were prepared by entwining 0 wt% of each other with a water jet. This non-woven fabric has a water flow rate of 29.8 seconds of ion-exchanged water per unit area of 23.7 cm ² and a water flow rate of 29.8 seconds, an average pore size of 25.5 μm, and a maximum pore size of 87.8 μm. Warp direction is 9.9 Kg / 5 cm, weft direction is 9.4 Kg / 5 cm, breaking elongation is 60.7 in the warp direction.
%, And the weft direction was 69.0%.

From this non-woven fabric, a caliber of 5 was obtained by the heat sealing method.
A tubular bag having a length of 5 mm and a length of 270 mm was made. A predetermined amount of cellulose powder was placed in this bag and activated with alkali to obtain gelled cellulose. Next, the gelled cellulose was taken out, poured into water to be inspected and collected in a polypropylene 18 liter tank, an anionic flocculant was appropriately added, and after stirring, the bag was again inserted into the upper mouth of the polypropylene tank. When the tank was tilted and filtered, the entire amount of the filtration was completed in 35 seconds, and the bag was neither stretched nor broken, and cellulose was filtered and remained in the bag. Also, this bag could be washed and repeatedly used.

[0013]

INDUSTRIAL APPLICABILITY The filtration bag for water quality inspection according to the present invention has a high filtration capacity and a high filtration rate of 18-2.
With about 0 liters of collected water, filtration and collection of the adsorbent can be carried out at a collecting site in a short time of about 0.5 to 1 minute, and further, it has durability such that it can be washed and repeatedly used. Further, the bag-like shape is lightweight, convenient to carry, and excellent in handleability, and facilitates the operation of filtration treatment.

Claims (3)

[Claims] 1. A water quality test composed of a nonwoven fabric having a water flow rate of 300 cc of ion-exchanged water per unit area of 23.7 cm ² for 50 seconds or less and a pore size of 15 to 35 μm on average and 100 μm or less at maximum. Filtration bag. 2. The nonwoven fabric is 8 kg / 5 in both warp and weft directions.
The filtration bag for water quality inspection according to claim 1, which has a tensile strength of not less than cm and an elongation at break of not more than 80%. 3. The water-inspection filtration bag according to claim 1, wherein the bag contains an adsorbent.