KR100297377B1 - Core extractor and testing method - Google Patents

Abstract

The present invention relates to a core extractor for collecting the filter medium of the filter paper and to a test method for measuring the turbidity of the sample collected in the tap water producing plant.

The present invention can be collected by the cross section of the filter medium using a core collector consisting of a core collector tube and a divider, and the efficiency of the filter medium can be measured and the efficiency evaluation before and after backwashing by the sampling and dividing and turbidity measurement process. It is.

Description

Core extractor and testing method

The present invention relates to a core extractor for collecting the filter medium of the filter paper and a test method for measuring the turbidity of the sample collected in the tap water producing plant.

The general water treatment process of water treatment plant producing tap water consists of water intake → raw water inflow → coagulation → sedimentation → filtration → disinfection → water supply. The filter paper is the final treatment process of water purification production. The water quality is determined.

The main function of the filter paper is the complete removal of the turbidity in the water and consequently a buffer against water and water fluctuations.

As the filter paper is deteriorated due to accumulated turbidity after a certain time, the filter paper must go through a backwashing process to restore the filtration function by periodically removing the suspended matter in the filtrate. to be.

Therefore, it is essential to conduct periodic investigations and evaluations of filter media and backwashing efficiency and to operate and operate filter papers according to the results in order to perform the function of filter paper, but at present, standardized sampling and its test for backwashing efficiency analysis As there is no method, some water treatment plants have problems in obtaining representative samples such as collecting a filter medium with a shovel.

The present invention is to provide a standardization of the filter medium collection method and the test method using the same in the periodic investigation of the filter medium and backwashing efficiency for efficient operation of the filter paper.

The core extractor for collecting filter paper filter medium of the present invention has a cylindrical core collecting tube having a predetermined length and diameter, a moving passage penetrated perpendicularly to one side of the core collecting tube, and a horizontal direction with a predetermined interval in the moving passage. It consists of a insertion groove which is drilled into the insertion groove, the split piece fitted into the insertion groove and fitted into the inner diameter of the core collecting pipe, and a handle fixed to one side of the split piece and moved through the movement path of the core collecting pipe.

The test method of the present invention includes a sample sampling process of collecting a sample by inserting a core collecting tube from the surface layer of a filter medium, a sample splitting process of collecting a sample collected by the core collecting tube at a 5 cm interval by inserting a divider into an insertion groove, The sample is collected by repeating the sampling process and the sample splitting process, and the turbidity measurement process of measuring the turbidity by stirring the collected sample with a Jar-Tester.

The test shall be carried out once before and after backwashing, but it shall be suitable to take a sample within 30 minutes after complete drainage.

1 is a perspective view of the present invention core harvester

Figure 2 is a cross-sectional plan view of the core harvester of the present invention

Figure 3 is a side cross-sectional view of the core harvester of the present invention

Figure 4 is a turbidity comparison graph before and after back washing by the media depth of the present invention

[Explanation of symbols on the main parts of the drawings]

1: core collection hall 2: moving path

3: Insertion groove 5: Divider

6: split piece 7: handle

The core collector of the present invention comprises a core collecting tube (1) and a divider (5). The core collecting tube (1) is manufactured by using a stainless steel pipe having an outer diameter of 42 mm, a thickness of 2 mm, and an inner diameter of 38 mm, but for each cross section. Sample division of 5 cm intervals is possible by forming the insertion groove (3) in the horizontal direction in multiple stages at intervals of 5 cm to form a moving path (2) penetrating the insertion groove (3) up and down,

The core splitter 5 has a thickness of 3 mm, a length of 140 mm, and a diameter of 33 mm of the divided piece 6, and a handle 7 is formed on one side of the divided piece 6.

Here, the split piece 6 of the divider 5 can move the handle 7 to the moving path 2 while being fitted in the insertion groove 3.

In other words, when the core collecting tube 1 is inserted into the core by applying a vertical force to the sample, the sample is inserted into the core collecting tube 1 and the core collection tube is inserted to the desired depth and the core collecting tube 1 is removed. In (1), the sample is filled, and at this time, the divider 5 is inserted into the insertion groove 3 to collect a sample having a desired depth.

The divider 5 inserts the split piece 6 into the insertion groove 3 to cut the sample and moves the handle 7 to the moving path 2 to divide the sample.

Therefore, by using the core collection pipe 1 and the divider 5 of the present invention, it is possible to take a standardized sample anywhere in the country.

The test method of the present invention is as follows.

① Sampling process

Select the point that can represent the filter paper and insert the core collecting pipe (1) by applying a vertical force.

When the core collecting pipe 1 is inserted into the filter media layer, the compression of the media generally 60-80 cm proceeds and the compression is about 40 cm at the time of 60 cm collection.

That is, take a 10cm from the surface layer of the filter medium and insert the core collecting pipe (1) at the same point again, and collect 10cm of the bottom surface of the sample.

As such, it is preferable to collect and collect the filter media, but if necessary, it is possible to take the filter media and sample the entire layer.

② Sample division process

The sample collected in the sampling process is divided using a divider 5 at intervals of 5 cm.

If the sample is collected several times, the sample is not compressed and can be divided into 5cm intervals. However, if the sample is compressed, the sample fraction should be adjusted according to the compression rate.

The amount of the sample collected by the core collecting pipe 1 by the divider 5 by 5 cm space | interval becomes 50.0-56.7 ml.

③ Repeated Collection Process

In the same filter paper, except for the place where the sample is collected, repeat the above ①② once to make the total amount of sample per section about 100ml.

④ Turbidity measurement process

100 ml of the sample collected in the above ③ was immersed in a beaker containing 2 liters of distilled water and stirred at 200 rpm for 2 hours in a Jar-Tester to measure turbidity with an NTU turbidimeter.

The test described above is conducted once before and after backwashing and the results are shown graphically.

Since the filter paper is operated with water, the sample must be drained completely by opening the drain valve installed on the filter paper to the gravel layer of the filter paper.After the water is completely drained, take the sample within 1 hour before the filter paper is dried. It is desirable to collect within 30 minutes after complete drainage.

The turbidity comparison graph before and after backwashing for each filter depth by a specific water treatment plant by the test method of the present invention is shown in FIG. 3.

From these graphs, it can be seen that the specific water purification plant composed of double media has a lot of turbidity on the surface, and a considerable amount of turbidity is confined even at 40-50cm, which is the interface between sand and anthracite, and shows typical double media characteristics.

In addition, after the backwash test, the surface of the media was relatively well removed, but the turbidity of the sand and the anthracite was high. Can be.

Therefore, the backwashing strength can be adjusted according to the turbidity distribution condition before and after backwashing to increase the efficiency of the filtration process using the test result value, and the amount of media replacement can be determined according to the median particle size and the amount of turbidity retention by depth. If it is integrated only on this surface, a method of improving the filtration efficiency can be devised.

The present invention can perform the filtering of the filter media accurately and simply by cross-section and by providing a test method using the same can achieve the efficiency and advancement of filter paper operation management.

Claims (5)

Cylindrical core collecting pipe having a certain length and diameter, A movement path penetrated vertically through one side of the core re-collecting pipe, An insertion groove drilled in a horizontal direction at a predetermined interval on the moving path, A split piece fitted into the insertion groove and fitted into an inner diameter of the core collecting pipe, Core harvester, characterized in that the splitter consisting of a handle fixed to one side of the split piece is moved in a moving path. Sampling process of taking a sample by inserting the core collecting tube from the surface layer of the media; A sample division process of taking a sample collected by a core collecting tube at intervals of 5 cm by inserting a divider; Collecting the sample by repeating the sampling and dividing process; A core test method consisting of a turbidity measurement process of measuring the turbidity by stirring the sample taken with a Jar-Tester. The core harvester of claim 1, wherein the core collecting tube (1) has an insertion groove (3) formed at 5 cm intervals so as to divide a sample having a 5 cm interval with a divider (5). In the sample collection process, a sample of 10-20 cm intervals is collected from the filter media layer, and a sample of 10-20 cm intervals is sampled at the sample collection point. Core test method to collect. The core test method of claim 2, wherein the sampling time is collected within 30 minutes after the water of the filter paper is completely drained.