JPH0550050A - Device for removing deposit in pipe - Google Patents

Abstract

PURPOSE:To easily and efficiently clean the inside of a drain pipe by using a pig. CONSTITUTION:A bypass pipe 20 is provided at the base end of a drain pipe 10 connecting a storage tank 1 and a flocculation tank 2 to surround a waste liq. delivery pump 15. A value 21 for closing the pipe from the upstream side toward the downstream side at all times, a pump 22 for sending a pig under pressure and a three-way coupling 24 for inserting the pig are provided to the bypass pipe 20. When the inside of the drain pipe 10 is cleaned, the lid 26 of the coupling 24 is removed, two or more pigs connected with a rope are inserted into the coupling, and the pigs are sent into the pipe 10 by the pump 22 to clean the inside of the pipe.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for removing deposits adhering to the inner wall of a pipe.

[0002]

2. Description of the Related Art Since a large amount of organic waste liquid containing nitrogen compounds and other organic substances is discharged from a painting department of an automobile or the like, it is usually purified by a biological method.

However, when such a purification treatment is carried out for a long period of time, the treated drainage liquid in the pre-painting treatment process and the electrodeposited drainage liquid in the electrodeposition process settle and adhere to the inner wall of the drain pipe. The passage is constricted, which causes the pump to overheat,
The waste liquid overflows from the pretreatment tank and the electrodeposition tank as the discharge amount decreases, and further, the flow amount of the waste liquid into the coagulation tank decreases, so that the BOD component oxidizing bacteria and nitrifying bacteria in the aeration tank and the sedimentation tank are reduced. However, there is a problem in that the concentration distribution of the wastewater fluctuates, and the wastewater is discharged to the outside without sufficient purification treatment.

In order to solve such a problem, a pig made of polyurethane foam is inserted into the inside of a joint pipe provided in a part of a drainage pipe, and this is pumped by a waste liquid delivery pump. The settling-hardened material in the drainage pipe was removed, but this operation usually needs to be performed four times using a pig whose hardness gradually decreases, so the fitting pipe must be removed or connected each time. Not only is it complicated and time-consuming, but the pumps attached to the drainage pipes cannot pump the pigs sufficiently, and as a result, they clog the drainage pipes or sufficiently remove deposits. It had the inconvenience of being unable to do so.

[0005]

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and its object is to:
It is an object of the present invention to provide a new device for removing deposits in a pipe, which can reliably remove deposits in a pipe line by a pig without detaching the joint pipe and with a necessary pumping force.

[0006]

That is, according to the present invention, a bypass pipe bypassing a drainage delivery pump is provided at the base end of a drainage pipe line as a device for removing deposits in a pipe for achieving such a subject. Along with this bypass pipe, a pump for pumping pigs from the upstream side to the downstream side and a pig insertion part that is always kept in a closed state are arranged, and the pig inserted from this pig insertion part into the pipe is dedicated. The pigs are pumped into the drainage pipe while being pumped into the drainage pipe to remove the deposits.

[0007]

EXAMPLES The examples shown below will be described below. FIG. 1 shows an embodiment of the present invention applied to an apparatus for purifying organic waste liquid by an activated sludge method.

First, the general structure of this purification apparatus and the biological purification method of wastewater using this apparatus will be described. Organic substances containing nitrogen compounds and other organic substances discharged in the pre-painting treatment step or the electrodeposition step. The wastewater is temporarily stored in the storage tank 1 and then guided to the coagulation tank 2 by the drainage pipe 10, where the coagulation and removal of the paint components is carried out by the inorganic coagulant such as aluminum sulfate and ferric chloride and the organic coagulant. Done.

The waste liquid from which the paint components have been coagulated and removed is then introduced into a high-load aeration tank 3 in which sludge containing BOD component oxidizing bacteria or nitrifying bacteria is stored, where high-speed aeration is performed by aeration and submerged stirring. The waste liquid containing sludge that has been treated and overflowed from there is then introduced into a standard aeration tank 4 that stores sludge containing BOD-oxidizing bacteria or nitrifying bacteria, where it is aerated by the aeration method,
The OD component is oxidized or nitrified into nitrate nitrogen or nitrite nitrogen.

The waste liquid containing these sludges is further introduced into the sedimentation tank 5, where the nitrate nitrogen, the nitrite nitrogen and the sludge are separated by sedimentation, and the supernatant liquid is discharged to the subsequent step,
The sludge that has been separated by settling is collected by the circulation pump 6 through the circulation pipe 7 into the high-load aeration tank 3 and the standard aeration tank 4 and reused.

By the way, the apparatus for removing deposits in a conduit, which is a feature of the present invention, is arranged in the drain pipe 10 connecting the above-mentioned storage tank 1 and coagulation tank 2. In this drain pipe 10,
The first valve 1 for opening and closing the pipeline of the drainage pipe 10 is provided on the upstream side of the base end portion.
1 is provided on the downstream side of the first valve 11, and two front and rear three-way joints 1 to which a bypass pipe 20 described later is connected.
2 and 13 are joined together, and these three-way joints 12, 1
A pump 15 for delivering waste liquid is disposed downstream of the second valve 14 that closes the pipeline of the drainage pipe 10 when the inside of the pipeline is clean.

On the other hand, the bypass pipe 20 connected to the base end portion of the drain pipe 10 via two front and rear three-way joints 12 and 13 so as to bypass the waste liquid delivery pump has the same diameter as the drain pipe 10. A third valve 21 is provided on the upstream side of the bypass pipe 20 to open the pipeline of the bypass pipe 20 when the inside of the pipeline is cleaned. A pig pressure feeding pump 22 which is stronger than the pump 15 is provided, and a three-way joint 24 for inserting a pig into the bypass pipe 20 is connected to the downstream side thereof.

As shown in FIG. 2, the three-way joint 24 for inserting a pig has the open pipe end 25 always closed by the lid 26, and only when removing the deposit in the drain pipe 10. With the lid 26 open, two pigs 2 to be described later will be described.
It is configured to insert 7, 28.

The open pipe end 2 of the three-way joint 24 for inserting a pig
From FIG. 5, two pigs 27, 28 connected by a short rope 29 are inserted, and these are sent from the bypass pipe 20 to the drain pipe 10 through the three-way joint 13 by the powerful pig pump 22 for draining the drain pipe. It is configured to remove the pretreatment waste liquid and the electrodeposition waste liquid that have settled on the inner wall of 10 and adhered and hardened.

Two pigs 2 used for removing this waste liquid
7 and 28 are made of a corrosion-resistant material having an appropriate elasticity such as polyurethane foam.
The first and second pigs 27 and 28 that are inserted first are made of a material that is harder than the second pig 28 that is inserted later.

In these pigs 27 and 28, the outer diameter d∃ of the first pig 30 is larger than the inner diameter D of the drain pipe 10 by about 0.3 to 0.5 mm, and the diameter dÅ of the second pig 28 is larger. The inner diameter D of the drainage pipe 10 is made larger by 0.5 to 0.7 mm. According to the experiment, if the outer diameter d∃ of the first pig 27 is d∃ <D + 0.3 mm, a sufficient cleaning effect cannot be obtained, and the outer diameter dÅ of the second pig 28 is dÅ> D + 0.7.
It has been found that when the value is mm, not only a great load is applied to the pump 22 for pumping, but also a difference in cleaning effect does not occur.

The purifying device constructed as described above is usually
It is used with the bypass valve 20 closed by the third valve 21. Then, in this state, an organic waste liquid containing a nitrogen compound and other organic substances discharged in the pretreatment step or the electrodeposition step is introduced from the storage tank 1 to the aggregating tank 2, and the inorganic aggregating agent such as aluminum sulfate and ferric chloride is introduced. And the organic flocculant is used to coagulate and remove the paint components, and then the waste liquid from this is guided to the high load aeration tank 3 and the standard aeration tank 4 in order to be aerated by the aeration method, and the BOD component oxidizing bacteria or nitrifying bacteria therein The BOD component is oxidized or nitrified by the contained sludge, and the waste liquid together with the sludge is guided to the settling tank 5 from this, and only the supernatant liquid of the biologically purified waste liquid is discharged to the outside.

By the way, if such a treatment is carried out for a long period of time, the pretreatment waste liquid and the electrodeposition waste liquid are deposited on the inner wall of the drainage pipe 10 connecting the storage tank 1 and the coagulation tank 2 and the pipeline is narrowed,
Since the drainage pump 15 overheats and the drainage overflows from the storage tank 1 and the coagulation tank 2, after a certain period of use, the drainage pump 15 located upstream The valve 14 of No. 2 is closed.

Then, with the third valve 21 still closed, the lid 26 is removed from the three-way joint 24 for pig insertion, and from there, the first pig 27 and the second pig 28 joined by the rope 29. Insert in this order into the joint 24 and cover 2
Close 6

Then, under this condition, the third valve 21 is opened and the pig pressure-feeding pump 22 is started.
The two pigs 27, 28 are pushed out from the bypass pipe 20 into the drain pipe 10 while being strongly pressed by the dedicated pump 22, and are first attached to the inner wall of the drain pipe 10 by the preceding first pig 27 having high hardness. Roughly remove the adhered deposits, and the second pig 28 with a slightly larger diameter that follows
Wipe off the deposits remaining on the inner wall of the drain pipe 10 by
The cleaning of the inside of the drainage pipe 10 is completely completed by performing the operation once.

These pigs 27 and 28 are used in the flocculation tank 2
When it is discharged into the interior and the predetermined cleaning process is completed, the third valve is closed to close the conduit of the bypass pipe 20, and the second valve 14 is opened to restore the waste liquid processable state.

In the above-described embodiment, the two hard and soft pigs 27 and 28 are used, but the drain pipe 1
Depending on the difficulty of cleaning inside 0, three or four pigs can be used, and as in the conventional case, one pig may be inserted to clean the inside of the drainage pipe 10.

[0023]

As described above, according to the present invention, the pig is pumped from the upstream side to the downstream side to the bypass pipe provided at the base end of the drainage pipe so as to bypass the waste liquid delivery pump. Since the pump and the pig insertion part are installed, the pig can be inserted from the pig insertion part and the pump for pumping the pig can be used to pump it to clean the drainage pipe very easily and efficiently. be able to.

Moreover, since the pig is pumped by the dedicated pump for pumping the pig arranged in the bypass line without relying on the pump for pumping the waste liquid, this pump is provided with the capability necessary for pumping the pig. Only by doing so, it is possible to perform the cleaning work in the pipe line extremely efficiently without causing clogging of the pig.

[Brief description of drawings]

FIG. 1 is a diagram showing an example of a waste liquid purification apparatus provided with an apparatus that constitutes an embodiment of the present invention.

FIG. 2 is a sectional view showing a main part of the same device.

[Explanation of symbols]

 1 Storage Tank 2 Coagulation Tank 10 Drain Pipe 15 Waste Liquid Delivery Pump 20 Bypass Pipe 22 Pig Pressure Delivery Pump 24 Pig Three Way Joint 26 Lid 27, 28 Pig

Claims (1)

[Claims] 1. A bypass pipe bypassing a drainage delivery pump is provided at a base end portion of a drainage pipe line, and the bypass pipe is constantly closed with a pump for pig pressure feed from an upstream side to a downstream side. A device for removing deposits in a pipe, which is provided with a pig insertion portion that is held by the pipe.