JP2936524B2 - Pesticide removal equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for separating and removing pesticides dissolved in wastewater.

[0002]

2. Description of the Related Art Conventionally, as a device for removing pesticides dissolved in wastewater, a filtration device filled with granular activated carbon, a device for injecting powdered activated carbon, and the like are known.

[0003]

As described above, a treatment apparatus using granular activated carbon has been proposed as a method for removing pesticides in wastewater, but the granular activated carbon treatment has an average diameter of 1 mm.
Activated carbon particles are passed through an adsorption layer filled with a bed height of about 1 m, and the pressure loss for water flow is large,
In order to prevent clogging due to turbidity of the water to be treated, an operation for periodically cleaning the adsorption layer and a pump, a pump tank, a backwash water storage tank, a backwash drain tank, and related piping are required. This is because the drainage of golf courses and fields where pesticides are sprayed is carried out by a natural flow method using a hydraulic gradient with a piping system buried underground, so the arrangement of the above facilities is large. Additional expansion and improvement work is required.

Further, in the granular activated carbon apparatus, the activated carbon fine powder flies when the activated carbon is charged, and the working environment is deteriorated, and the maintenance work such as the troublesome work of extracting the activated carbon wetted with water when exchanging the activated carbon having lost the adsorbing ability is considered. However, there is a problem that the management ability of the pesticide user cannot cope with the problem.

[0005]

According to the present invention, an inflowing water pipe is provided at an upper portion in a separation tank, and the inside of the separation tank is partitioned by partitions having slit-shaped openings, and the partitions are partitioned by the partitions. In each of the small chambers, a cartridge-like adsorption filter material packed in a bag of fibrous activated carbon was placed, and a drainage collecting pipe was provided at the bottom of each small chamber, and the cartridge-like adsorption filter material was always immersed in water. A pesticide removal method, wherein a treated water drainage pipe is raised from the water collecting branch pipe to form a state, and water passing through the cartridge-shaped adsorption filter medium is drained through the treated water drainage pipe. A device is proposed.

[0006]

In the above apparatus of the present invention, the cartridge-shaped adsorption filter medium is placed in a multi-layered state in a separation tank, water to be filtered is caused to flow down from an inflowing water pipe, and the pesticide is separated into the adsorption filter medium. It is.

[0007]

1 to 3 show the structure of the apparatus.
A trough-shaped inflow moisture pipe 1 is provided at an inflow portion from a drainage pipe (not shown) to the apparatus, and the drainage water uniformly flows down to a filter medium layer described later. In the case shown in the figure, the adsorption filter medium 3 divided into four chambers by the partition walls 2 is constituted by cartridges 4 packed in a net-like bag of six bags per chamber, and there are 24 cartridges in four chambers. Water passes through the adsorbing filter medium 3 and is uniformly collected by a water collecting branch pipe 5 provided at the bottom of each small chamber, and is drained by a treated water drain pipe 6 that is set up to keep the filter medium constantly immersed in water. You. In addition, the apparatus is provided with an overflow pipe 7 for securing a drainage function against abnormal inflow due to heavy rain, spring water and the like, and a drain pipe 8 for drainage when cleaning the apparatus. The cartridge 4 packed in a net-like bag
When the height of the packed bed in FIG. 2 is changed, a slit-shaped opening 9 is provided in the partition wall 2 so that the inflow water is evenly distributed on the front surface of the adsorbing layer (see FIG. 3).

[0008] The following description will be made while comparing the filtering action of the apparatus of the present invention having the above-mentioned structure with the conventional method using granular activated carbon. (1) Compared to granular activated carbon, fibrous activated carbon having the following characteristics is used as a filter medium to reduce the height of the filter medium layer and the pressure loss during water passage, and to be treated by a natural flow method. Enable. In other words, the pore size distribution of the activated carbon pores is uniform, and the pores are formed with pores of 25 angstroms or less, so that the specific surface area and the outer surface area are larger than that of the granular activated carbon, so that the adsorption ability and the adsorption speed for pesticides are large. . As a result, the height of the adsorption layer can be reduced. Since the pore distribution is less than 25 angstroms,
Agrochemicals having a molecular weight of about 200 to 300 are selectively adsorbed from various contaminants. The packing density of the flocculent fibrous activated carbon can be changed by changing the filling weight and the filling volume, but in the present invention, it is set to 20 to 80 kg / m3. Due to the low packing density, the packed layer has many voids,
The amount of suspended matter retained becomes large, and as a result, clogging is difficult.

(2) The above fibrous activated carbon is 100 mm thick
Packed into a cartridge sewn into a bag with nylon or vinylon (both trademarks) mesh to a degree,
Filling is divided into three stages and the amount of activated carbon is changed. (3) The mesh bag cartridge is maintained so that the filling density and the filling capacity can be adjusted on site, thereby preventing a short circuit of water during operation. (4) The fibrous activated carbon is filled in a cartridge and is prevented from flowing out by a supporting net, so that it functions as a supporting gravel layer and a water collecting device such as a perforated plate used in an ordinary filter bed. (5) When replacing the cartridge filled in the casing, remove the upper cartridge and turn the new cartridge to the lower and the lower cartridge to the upper.
The activated carbon is brought into contact with highly concentrated water on the inlet side of the influent water to make effective use of activated carbon.

(6) By providing a small chamber with a bottom partition in the casing, it is possible to reliably produce a predetermined filling capacity and filling density by the number of bags when compacting and filling the cartridge.
The inflow water can be evenly supplied to the adsorption bed. (7) By providing a slit-shaped opening in the partition wall and corresponding to the height of the packed bed of the cartridge, the water level of each small chamber in the casing is made equal, and the flow of each chamber is made uniform.

FIG. 4 shows that fibrous activated carbon is layered at a height of 3 cm and 5 c.
This is the result when m was filled and the pesticide was removed. Layer height 2c
m, pesticides at the entrance cannot be completely removed,
m removes completely. FIG. 5 shows the activated carbon packing density of 50.
It is a relationship between a water line velocity and a pressure loss when water is passed through a fibrous activated carbon layer having a bed height of 10 cm in kg / m3. The pressure drop per layer height 10 cm is 1 cm to 15 cm at a liquid flow velocity of 10 m / day to 240 m / day,
Even if it is placed in three stages, it is 3 cm to 45 cm, and at such a pressure, water can flow through the head under natural flow.

[0012]

According to the apparatus of the present invention having the above configuration, the following effects can be obtained. (1) The drainage system for golf courses and fields where pesticides are sprayed,
In many cases, drainage is carried out in a natural flow manner by pipes buried in the soil or by gutters.
The filter media for fibrous activated carbon placed at the height of m can separate and remove pesticides from wastewater under low pressure loss, so it is possible to install equipment in the water distribution pipe system, Installation of such a water pump, a backwash water tank, a backwash water distribution tank, etc. is unnecessary, and thus the construction cost is reduced. (2) The fibrous activated carbon 3 packed in a cartridge packed in a net-like bag can be easily filled and removed with a filter medium by hand. In other words, the number of cartridges to be filled in the small chambers partitioned by the partition walls can be adjusted, and the cartridges can be uniformly filled, and can be easily taken out at the time of extraction. Even if the treated water deteriorates due to a decrease in the activated carbon capacity, an increase in the amount of the pesticide in the inflow water, or the like, it is possible to quickly respond by replacing the cartridge. (3) Even if fibrous activated carbon is filled in a filter bed with a mesh bag-shaped cartridge, if the filling capacity is large, the cartridge is deformed freely and it is difficult to fill the filter medium uniformly. With the provision, the cartridge in the small chamber is separated from the interaction with the cartridge in the other chamber by the partition wall, and the packing density and the filling capacity can be adjusted in the small chamber.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an outline of an apparatus of the present invention.

FIG. 2 is a perspective view showing a single unit of a cartridge-shaped adsorption filter medium.

FIG. 3 is a perspective view showing an aspect of a partition in the apparatus.

FIG. 4 is a graph showing the results of a pesticide (diadinone) adsorption test.

FIG. 5 is a graph showing the state of the initial water pressure loss of the fibrous activated carbon layer.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Inflow moisture piping 2 Partition wall 3 Adsorption filter media 4 Net bag cartridge

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Hideo Kato 3-10-12 Iwato Minami, Komae-shi, Tokyo Paru House 201 (72) Inventor Yasushi Muraki 2-3-1-11 Tsujido Nishi Kaigan, Tsujido-shi, Fujisawa-shi, Kanagawa (72) Inventor Keizo Kajioka 2-16 Tsurumai Nishi-machi, Nara City, Nara Prefecture Excel Tsurumai A-503 1962-9898 (JP, U)

Claims (1)

(57) [Claims] 1. A partial placing the inflow water pipe on top of the release tank, the separation tank, to form a slit-shaped opening septum
A cartridge-like adsorption filter medium packed in a bag of fibrous activated carbon is placed in each of the small compartments partitioned by walls, and a collecting branch pipe for drainage is installed at the bottom of each small compartment.
And always immerse the cartridge-shaped adsorption filter medium in water.
Rise the treated water drain pipe from the collecting branch pipe
Water that has passed through the cartridge-shaped adsorption filter medium
Is discharged through the treated water drain pipe .