JP3333592B2 - Sand removal equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a method for purifying a liquid to be treated, such as human waste, sewage, sludge, industrial wastewater, rivers, agricultural waterways, parks, playgrounds, and gardens. The present invention relates to a sand removing device for removing sand.

[0002]

2. Description of the Related Art Conventionally, as this type of sand removing device, for example, a structure shown in FIGS. 3 and 4 is known.

[0003] The sand removing apparatus shown in FIGS. 3 and 4 is a sand settling section in which a liquid 71 to be treated containing gravel, gravel, metal chips and dirt is partitioned into an upper part of a receiving tank 73 through a receiving port 72. The sediment flows into the sediment 74 and deposits a relatively heavy garbage 75 among gravel, gravel, metal chips, and dirt. The liquid to be treated 71 overflowing from the sedimentation part 74 flows into the receiving part 77 defined by the receiving tank 73, and relatively small sand 76 in the liquid to be treated 71 is deposited on the bottom of the receiving tank 73. Deposits in section 78.

Then, the liquid 71 to be treated in the receiving tank 73 is pumped by a pump 82 to various kinds of debris removing means such as a rotary screen and centrifugal separator.
83 to remove the debris in the liquid to be treated 71
Are stored in the storage tank 84. Since the liquid to be treated 71 that has flowed into the storage tank 84 has vinyl and paper removed by the residue removing means 83, fine particles that cannot be completely removed by the residue removing means 83 in the liquid to be treated 71. Sand 76 and the like settle on the bottom of the storage tank 84.

Then, the liquid 71 to be treated is
The liquid to be treated is purified by being conveyed to a purification treatment device or the like by the pump 82 together with the deposited fine sand 76 and the like.

[0006] On the other hand, the large-sized debris 75 deposited on the sedimentation section 74 of the receiving tank 73 is artificially sucked by a suction pipe 85 communicating with a vacuum tank 80 provided with a vacuum pump 79, and the vacuum tank 80
The water is filtered by the screen 86 inside, and is artificially scraped out from the outlet 87 and discharged. The liquid to be treated 71 sucked together is caused to flow into the receiving tank 73 again.

The receiving tank 73 is relatively large.
It is installed to be buried underground. Therefore, the receiving tank 73
Is located at a relatively deep position, and the suction force of the vacuum pump 79 cannot suck the deposited sand 76. Therefore,
The sand 76 deposited on the depositing portion 78 of the receiving tank 73 is periodically discharged by a person into the receiving tank 73 from an inspection port (not shown) and artificially discharged.

[0008]

However, in the sand removing apparatus shown in FIGS. 3 and 4, there is a possibility that the heavy-weight debris 75 deposited on the sedimentation part 74 of the receiving tank 73 may be closed during suction by the vacuum pump 79. is there. Further, it is necessary to stop the sand removal operation of the liquid to be treated 71 and artificially discharge the sand 76 deposited in the deposition section 78 of the receiving tank 73 and the heavy trash 75 having a strong odor filtered in the vacuum tank 80. Therefore, there is a problem that the sand removal work is complicated and the working environment is bad.

The sand 76 deposited on the sedimentation section 78 at the bottom of the receiving tank 73 is removed together with the liquid 71 to be treated by a pump 82 to remove the residue.
The pump 82 and the debris removing means 83 may be subjected to a large load, and the pump 82 and the deodorizing means 83 may be damaged. is there.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has as its object to provide a sand removing device capable of removing sand efficiently without requiring any manpower.

[0011]

According to a first aspect of the present invention, there is provided a sand removing apparatus, comprising: a receiving tank having a receiving port into which a liquid to be treated is introduced; A suction tank connected to the suction pipe, a vacuum tank having a vacuum pump for sucking up the deposit deposited on the deposition section through the suction pipe, and one end of the suction pipe on the deposition section side of the suction pipe. parts are connected in the vicinity together when discharging the air to the suction pipe
An air inlet pipe for supplying washing water to the one end of the vacuum tank
And the other end is connected to the air introduction pipe,
Discharge air and supply cleaning water to the vacuum tank
And an inlet main pipe, from the air inlet pipe to the suction pipe.
By supplying the washing water, the deposits in the
After making it easy to move, the suction from the air introduction tube
While discharging air into the pipe, the vacuum pump
Deposits in the stacking section with air discharged from the air introduction pipe
Both are sucked into the vacuum tank, and this vacuum pump
After the suction, the air from the introduction main pipe to the vacuum tank is emptied.
Discharge of air and washing water from the introduction main pipe to the vacuum tank
And supply .

[0012] The sand removing device according to the second aspect is the first aspect.
In the sand removal equipment of
Washing water after washing of the deposits in the vacuum tank.
It is equipped with a drain pipe that returns to the receiving tank as purified water .

[0013]

According to a first aspect of the present invention, there is provided a sand removing device, wherein a suction pipe opened to a bottom of a receiving tank into which a liquid to be treated flows through a receiving port is provided near an end of the suction pipe on the side of the depositing section. As the air is discharged from the air inlet pipe connected to the suction pipe, the deposit deposited on the depositing section is sucked into the vacuum tank via the suction pipe by the vacuum pump and sand is removed. As the hanging specific gravity decreases, the air lift of the air ensures the suction of the deposits, and enables suction from a relatively deep position such as the bottom of the receiving tank. In addition, sand removal efficiency is improved without requiring any work.

[0014] The sand removing device according to the second aspect of the present invention is arranged such that the
The cleaning water supplied to the vacuum tank is
Return to the receiving tank as washing wastewater after washing the sludge in the tank
Is done.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The construction of an embodiment of the sand remover of the present invention will be described below with reference to the drawings.

In FIG. 1, reference numeral 1 denotes a receiving tank, and the receiving tank 1 is a box-shaped building made of concrete or the like and is buried and installed in the ground.

The receiving tank 1 has a receiving port 2 at an upper corner, and a hose 7 for discharging a liquid to be treated 6 such as human waste derived from a sewage transporting vehicle 5. Is connected.

The receiving tank 1 is formed with a settling part 9 and a receiving part 10. The sedimentation section 9 has a capacity of about 2 m ³ and is positioned below the receiving port 2 so that the liquid to be treated 6 flowing from the receiving port 2 overflows and flows into the receiving section 10. It is formed in an open box shape. Further, a sand reservoir 11 is formed at the bottom of the sand settling portion 9 with a bottom surface inclined in a funnel shape toward one corner.

At the bottom of the receiving part 10 of the receiving tank 1, a sediment 12 is formed.
As in the case of 11, the bottom surface of the receiving tank 1 is formed to be inclined toward one corner, and is formed in a funnel shape that is inclined at an angle of about 60 ° from a horizontal plane near one corner.

A transfer pipe 14 for transferring the liquid 6 to be treated in the receiving section 10 of the receiving tank 1 to the outside of the receiving tank 1 is connected to the receiving tank 1 above the depositing section 12. Further, a pump 15 is connected to the transfer pipe 14, and the liquid to be treated 6 is transferred by the transfer pipe 14 by driving the pump 15.

The transfer pipe 14 is provided with, for example, a filtration separation, a centrifugation, or the like for separating dust, foreign matter, and the like in the liquid 6 to be treated.
A debris removing means 17 such as a rotating screen is connected, and a storage tank 19 is connected to the debris removing means 17 via a transport pipe.

The storage tank 19, like the receiving tank 1, is buried under the ground in a box-shaped structure.
Also, inside the storage tank 19, a storage unit 20 and a sand pit
21 are defined. And this sedimentation pit 21
Is located downstream of the transport pipe 14 for transporting the liquid 6 to be treated from the debris removing means 17 and is formed in a box shape with an opening at the top so that the liquid 6 to be treated can overflow, and a funnel-shaped sediment at the bottom. twenty two
Are formed.

On the other hand, reference numeral 24 denotes a vacuum tank.
24 has a capacity of, for example, about 2 m ³ , and is formed in a cylindrical shape having a cleaning section 25 that protrudes downward in a conical shape at the bottom.

The vacuum tank 24 is connected at the upper end thereof to a deaeration pipe 27 communicating with a vacuum pump 26, and at the lower end of the washing section 25, an electric valve 29 is provided.
Is connected to a discharge pipe 31. The exhaust gas discharged by the vacuum pump 26 is harmlessly and odorlessly processed by an exhaust processing means (not shown), and is discharged to the outside air.

A suction main pipe 33 is connected to the upper side surface of the vacuum tank 24. The suction main pipe 33 has tips at the tip of the sand settling part 9 of the receiving tank 1 and the suction tank 1 of the receiving tank 1, respectively. Deposit
12, and suction pipes 34a, 34b, 34c that open into the sedimentation section 22 of the sand pit 21 of the storage tank 19 are, for example, electrically operated valves 35a, 35b.
, 35c.

Air inlet pipes 36a, 36b, 36c are connected near the tips of the suction pipes 34a, 34b, 34c, respectively. Furthermore, these air introduction pipes 36a, 36b
, 36c, for example, via motorized valves 37a, 37b, 37c
The blower 39 having an electric valve 41a for discharging air, for example, is connected to the blower 39 via an introduction main pipe 36d.

An introduction main pipe 36d connected to a blower 39 is connected to the washing section 25 via a washing valve 42 so that air is projected to the deposit 16 for washing. Further, the cleaning unit 25 is provided with a cleaning water switching electric valve 41b for supplying cleaning water 40 such as fresh water or purified treated water.
A cleaning pump 43 having a cleaning valve 42
d to supply washing water to the sludge 16 for washing.

At the approximate center of the side surface of the vacuum tank 24, one end is connected to the upper part of the receiving tank 1, and the liquid 6 to be treated flowing into the vacuum tank 24 and the sediment sucked into the cleaning section 25
A drain pipe 45 having a motor-operated valve 44 for draining the washing waste water after washing into the receiving tank 1 again is connected.

On the other hand, the draining conveyor 30 is
And a conveyor section 48 whose lower end is located at the bottom of the liquid storage section 47 and protrudes upward at an inclination with a certain angle.

The liquid reservoir 47 is formed in a box shape and is provided with a return pipe 53 which overflows at an upper portion, and a motor-driven water drain valve 51 and a water drain pipe 52 are provided at an intermediate portion. The return pipe 53 and the drain pipe 52 are connected to the receiving tank 1.

The conveyor section 48 comprises a cylindrical casing 56 and a spiral screw body 57 provided coaxially and rotatably by driving means (not shown) in the casing 56. A gap of, for example, approximately 5 to 15 mm is formed between the outer periphery of the body 57 and the inner peripheral surface of the casing 56.

In this gap, the deposit 16 deposited on the bottom of the liquid reservoir 47 is transported upward by the screw body 57, and the liquid adhering to the deposit 16 falls into the liquid reservoir 47, Sludge
16 drainers are available.

On the lower surface of the upper end of the conveyor section 48, there is formed a discharge port 58 which opens downward and discharges the deposit 16 conveyed by the screw body 57. Below the discharge port 58, a deposit port 58 is formed. A hopper 59 for storing 16 is provided. And
A chute 61 is provided below the hopper 59 for appropriately discharging the sludge 16 stored in a debris carrier 60 or the like.

Next, the operation of the above-mentioned sand removing device for removing the sand to be treated and removing the residue will be described.

First, the hose 7 of the sewage transport vehicle 5 is connected to the receiving tank 1.
Of the receiving tank 1 from the hose 7
The liquid 6 to be treated, such as human waste, stored in the sewage transport vehicle 5 flows into the sedimentation section 9 of the receiving tank 1 via. The to-be-processed liquid 6 that has flowed into the sedimentation section 9 is formed by deposits 16 such as relatively large gravel, gravel, metal chips, and dirt in the to-be-processed liquid 6.
To be deposited. Thereafter, the liquid to be treated 6, which is the supernatant in which the relatively large sediment 16 has settled, overflows to the receiving section.
Flow into 10.

The liquid 6 to be treated flowing into the receiving section 10
Deposits 16 such as relatively small gravel, rough sand, and dirt that did not deposit at the inner sedimentation part 9 are deposited at the bottom of the receiving part 10.
Deposit on 12. Then, it flows into the receiving part 10 and the sludge 16
The liquid to be treated 6, which is the supernatant in which is settled, is transported to the residue removing means 17 via the transport pipe 14 by driving the pump 15.

Next, the liquid to be treated 6 flowing into the residue removing means 17
For example, paper, vinyl, cloth, filth, etc., which have not been deposited in the deposition section 12 of the receiving tank 1 are separated by filtration, centrifugation, a rotating screen, or the like, and the sedimentation pits 21 of the storage tank 19 are separated.
Flowed into. Then, the liquid 6 to be treated which has flowed into the sedimentation pit 21 has mud and fine sand having a diameter of about 1 mm or less gradually settle in the sedimentation part 22 of the sedimentation pit 21, and the liquid 6 to be treated overflows and is stored in the storage tank. It is stored in 19 storage units 20.

The sludge flowing into the sand pit 21
In 16, sediment is easily settled because light-weight refuse such as paper, vinyl, cloth, and filth is removed by the residue removing means 17.

Thereafter, the liquid 6 to be treated stored in the storage section 20 until the amount becomes a certain amount is conveyed to an apparatus such as a biological treatment in the next step and thereafter for processing.

On the other hand, the deposit 16 deposited on the sand reservoir 11 of the sedimentation part 9 of the receiving tank 1, the sedimentation part 12 of the receiving part 10, and the sedimentation part 22 of the sedimentation pit 21 of the storage tank 19 are suction pipes 34a, 34b. , 34c to be sucked out of the receiving tank 1 and the storage tank 19, respectively.

In the case where the liquid 6 to be treated is, for example, night soil, the sucked-out sediment 16 contains about 0.3% as the sediment 16. For example, once a week, in the sedimentation section 12 of the receiving section 10, for example, twice a month, and in the sedimentation section 22 of the sand pit 21, for example, once a week.
May be held.

That is, when the deposit 16 is sucked out,
The sludge 16 is settled and deposited. Therefore, in the deposition part 12 of the receiving part 10 of the receiving tank 1, first,
The electric valves 41a and 37b are opened, and the air introduction pipe 36 is
From b, air is introduced into the suction pipe 34b at, for example, 1.7 m ³ / min × 4000 mmAq, and the air is discharged to the deposit 16 from the opening at the lower end of the suction pipe 34b. The discharge of the air stops the blower 39 and closes the motor-operated valve 41a after a lapse of a predetermined time during which the sludge 16 is absorbed. Next, the motor-operated valves 41b and 37b are opened, and washing water is supplied from the air introducing pipe 36b by the washing pump 43. Of the sludge 16, the lighter-weight paper, vinyl, cloth, and dirt are washed away, and the sediment is washed away. The washed sands are brought into a state of being easily fluidized, the cleaning pump 43 is stopped, and the electric valve 41b is closed.

Then, the inside of the vacuum tank 24 is, for example, 5.8.
It is driven by a vacuum pump 26 at m ³ / min × 730 mmHg to make a vacuum state, and when a predetermined vacuum state is reached, the electric valve 35b
To release. At this time, the blower 39 is operated at the same time, and the electric valve 41
a and 37b are opened, and the deposit 16 deposited on the depositing section 12 of the receiving section 10 of the receiving tank 1 is sucked together with the discharged air.

The above-described receiving section 10 of the receiving tank 1 is also used for sucking the deposits 16 deposited in the sand reservoir 11 of the sand setting section 9 of the receiving tank 1 and the sediment section 22 of the sand pit 21 of the storage tank 19. Is sucked out in the same suction step as that of the sedimentation section 12.

At the time of this suction, as shown in FIG. 2, the deposit 16 deposited in the receiving tank 1 and the storage tank 19 is
While air is introduced from the air introduction pipe 36b by the blower 39,
Vacuum suction is applied to the vacuum tank 24 by the vacuum pump 26.

As a result of this suction, as shown in FIG. 2, air is present between the grains of the deposit 16 and the like,
The apparent specific gravity per unit volume in b decreases. Further, the sediment 16 is buoyant by the air lift of the discharged air so as to be pushed up by air bubbles, and is carried upward in the suction pipe 34b.

As described above, due to the air lift of the discharged air in addition to the suction by the vacuum, the sucked deposit 16 in the suction pipe 34b has air between the grains and the like, and the apparent specific gravity is reduced. Because of the lowering, in particular, the sediment 16 at a deep position can be easily drawn into the vacuum tank 24.

After suction into the vacuum tank 24 for a certain period of time, the electric valve 37b of the air introduction pipe 36b is closed, and the vacuum pump 26
Is stopped, and the electric valve 35b of the suction pipe 34b is closed. Next, the cleaning valve 42 is opened, the motor-operated valve 41a is opened, the blower 39 is operated, and the sediment 16 is air-cleaned to remove the sediment.
Blower after a certain period of time, entangled with 16 sands and filth
39 is stopped and the motor-operated valve 41a is closed. Next, the cleaning valve 42 and the motor-operated valves 41b and 44 are opened, the cleaning pump 43 is operated, the dirt separated from the sands in the vacuum tank 24 is washed away, and the waste water is drained through the drain pipe 45 into the receiving tank 1. Return to

Further, suction by the vacuum pump 26 and
At the time of supplying air and cleaning water during cleaning, air with a bad smell in the vacuum tank 24 is harmlessly and odorlessly treated by exhaust processing means (not shown) through a degassing pipe 27 and is discharged to the outside air.

Further, the deposit 16 such as gravel, sand, metal pieces, etc. from which dirt has been removed by washing deposited on the washing section 25 of the vacuum tank 24, first closes the electric drain valve 51 of the draining conveyor 30, and closes the electric valve 29. Is discharged through the discharge pipe 31 into the water reservoir of the draining conveyor 30.

In the draining conveyor 30, the screw 57
Is slowly rotated at several to several tens of revolutions per minute, and the deposits at the lower part of the liquid reservoir 47 are scraped up above the conveyor 48.

When the sediment 16 is scraped, the liquid 6 to be treated in the liquid reservoir 47 and the liquid 6 contained in the deposit 16 in the gap between the screw body 57 and the casing 56 are removed. , And flows down below the conveyor section 48 in the gap, and the sludge 16 is drained. In addition, the deposit 16 finer than the size of the gap between the screw body 57 and the casing 56, for example, the deposit 16 such as fine sand having a particle diameter of 1 mm or less sucked from the sand pit 21,
Since they are accumulated, they do not fall downward from the gap between the screw body 57 and the casing 56, but are lifted upward and drained.

When the drainage of the sludge is drained and discharged from the draining conveyor 30, the electric valve 51 is opened, the liquid in the liquid reservoir 47 is returned to the receiving tank 1 via the water drainage pipe 52, and the liquid level in the liquid reservoir 47 is changed. To prepare for receiving the next deposit 16.

The sediment 16 that has been scooped and drained by the screw body 57 is dropped into a hopper 59 through a discharge port 58 at an upper portion of the conveyor section 48 and is stored therein. After this,
The sludge 16 accommodated in a predetermined amount is loaded on a debris transport vehicle 60 via a chute 61 and processed at, for example, a landfill.

Therefore, in the conventional sand removing device, the deposit 16 deposited on the bottom of the receiving tank 1 and the storage tank 19 at a deep position, which could not be sucked out by the vacuum suction by the vacuum pump 26 having the conventional structure, is used. , Conventional vacuum pump 26
Can be sucked out of the receiving tank 1 and the storage tank 19.

For this reason, the deposit 16 deposited on the bottom of the receiving tank 1 which could not be removed by the conventional sand removing device is sand-removed, so that a large load is not applied to the pump 15 and the residue removing means 17, and the pump 15 The structure of the debris removing means 17 can be simplified while the damage of the debris removing means 17 can be prevented.

Further, fine sand and sediment 16, which tend to settle by the removal of light-weight trash such as paper, vinyl, and dirt, by the residue removing means 17 at the bottom of the storage tank 19, also remove sand. Therefore, a large load is not applied to the biological treatment device and the like after the next process, damage and blockage of the biological treatment device and the like after the next process can be prevented, and the sludge 16 deposited in the storage tank 19 by stopping the device can be prevented. There is almost no need to remove and clean, and the sand removal efficiency can be improved.

Further, conventionally, the deposit 16 deposited in the sand settling portion 9 of the receiving tank 1 is sucked into the vacuum tank 24 by vacuum suction, and the deposit 16 in the vacuum tank 24 is scraped out by the operator. However, in the same manner as the sedimentation section 12 of the receiving tank 1 and the sand pit 21 of the storage tank 19, the vacuum suction is applied to the vacuum tank 24 and the draining conveyor 30 discharges the liquid to the outside of the apparatus. It can be automated, can be easily performed in a series of processes without requiring humans, and can solve work environment problems.

Further, since air is introduced at the time of vacuum suction, it is possible to prevent the deposit 16 from being clogged in the suction pipes 34a, 34b and 34c, and to stably remove sand.

Although the above embodiment has been described with respect to the removal of sand from night soil, the present invention can be applied to the removal of sand from the liquid 6 to be treated in any water area including gravel and sand.

Further, depending on the state of the liquid 6 to be treated, the deposit 16
Are provided, and suction pipes 34a, 34b, to which air introduction pipes 36a, 36b, 36c are respectively connected are provided.
34c may be provided and vacuum suction may be provided.

[0062]

According to the first aspect of the present invention, the suction pipe which opens at the bottom of the receiving tank into which the liquid to be treated flows through the receiving port is provided on the side of the deposition section of the suction pipe. Air is discharged from the air introduction pipe connected near the end of the pipe, and the deposit deposited in the deposition section is sucked into the vacuum tank through the suction pipe by the vacuum pump to remove sand, so that it is sucked into the suction pipe. The apparent specific gravity of the sediment decreases, and the air lift of the air allows the sediment deposited at a deep position to be easily sucked up, and sand can be efficiently removed without requiring any manpower.

According to the sand removing device of the second aspect, the introduction book
Wash water supplied from the pipe to the vacuum tank is drained by the drain pipe.
Received as washing wastewater after washing the sludge in the vacuum tank
Can be returned to the tank.

[Brief description of the drawings]

FIG. 1 is a system explanatory diagram showing a configuration of an embodiment of a sand removal device of the present invention.

FIG. 2 is a cross-sectional view showing a situation in which a deposit is sucked by the suction pipe.

FIG. 3 is a system explanatory diagram showing a configuration of an embodiment of a conventional sand removing device.

FIG. 4 is a cross-sectional view showing a situation in which a deposit is sucked by the suction pipe.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Receiving tank 2 Receiving port 6 Liquid to be processed 12 Sedimentation part 16 Sediment 24 Vacuum tank 26 Vacuum pump 30 Drain conveyor 34a, 34b, 34c Suction pipe 36a, 36b, 36c Air introduction pipe 56 Casing 57 Screw body 58 Outlet

────────────────────────────────────────────────── ─── Continued from the front page Examiner Hiroshi Taniguchi (56) References JP-A-2-35902 (JP, A) JP-A-60-216814 (JP, A) (58) Fields investigated (Int. Cl. ⁷⁾ , DB name) B01D 21/24

Claims (2)

(57) [Claims] 1. A receiving tank having a receiving port into which a liquid to be treated flows and having a sedimentary portion at the bottom, a suction pipe having one end opening in the sedimentary part of the receiving tank, and the suction pipe connected to the suction pipe. a vacuum tank a deposit of depositing the deposition unit having a vacuum pump to suck through the suction pipe, with one end connected to the end portion of the deposition portion of the suction pipe for discharging air to the suction pipe An air inlet pipe for supplying washing water , one end connected to the vacuum tank and the other end connected to the air guide
It is connected to the inlet pipe and discharges air to the vacuum tank.
An inlet main pipe for supplying washing water, and supplying the washing water from the air inlet pipe to the suction pipe.
The sediment in the sedimentation section was made to flow easily
Later, when air is discharged from the air introduction pipe to the suction pipe
Both the vacuum pump and the deposit in the depositing section
The vacuum tank together with the air discharged from the air introduction pipe
And after suction by this vacuum pump,
Discharge air to the vacuum tank and
A sand removing device for supplying washing water to an empty tank . 2. The washing supplied from an introduction main pipe to a vacuum tank.
Cleaning water after washing the sludge in the vacuum tank
Characterized by comprising a drainage pipe back to the receiving vessel as 請
The sand removal device according to claim 1.