JPH08170351A - Vacuum type sludge collection method using barge and device thereof - Google Patents

Abstract

PURPOSE: To make it possible to execute collection work with high efficiency and without contaminating water quality and reduce the size of a device and equipment cost as well by sucking up sludge with water into a separation tank by a suction force of a roots type multi-stage vacuum pump and allowing the sludge to be settled therein and discharging a clarified supernatant liquid with a discharge pressure of the pump. CONSTITUTION: Sludge m deposited on the bottom of a lake is sucked up with water into a separation tank 3 from a suction hose 16 with a suction pressure of a roots type multi-stage vacuum pump P. The sludge is settled and separated from water. When the tank 3 is filled up with the sludges m and the water, the pump is switched over to reverse rotation from normal rotation, thereby feeding compressed air into the tank 3. As a result, the clarified supernatant liquid W separated from the sludge m is discharged outboard through the exhaust port 13 of the tank 3 with a discharge pressure of the pump p. When the water level of the clarified supernatant liquid in the tank 3 drops to a specified position, the pump 3 is switched over to normal rotation once again, thereby starting sucking up of the sludge with water into the tank 3. The suction and discharge actions are repeated, thereby increasing the concentration of the sludge m. The settled sludge is collected outside the tank 3 by means of a sludge carrier at a proper time.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vacuum sludge recovery method and device using a barge for recovering sludge deposited on the bottom of a dam or natural lake.

[0002]

2. Description of the Related Art Sludge that has accumulated on the bottom of a dam is normally discharged to the downstream side from a sludge discharge gate provided in the dam. With this method, a large amount of sludge is discharged at a time. Pollution due to sludge is occurring in the bay. In addition, a dredging method of scooping sludge or digging the bottom of the lake is known, but this method pollutes the lake water during recovery, so in natural lakes it damages the fish and aquatic plants inhabiting it, and eventually the basin of the basin. There is a possibility that it may develop into destroying the ecosystem.

[0003]

In addition to the above, in agitation and suction type dredging in a wide area such as a harbor, since the amount of water is large and the water flow changes, the pollution phenomenon of seawater etc. is relatively small, but in dams and lakes The form is unsuitable because water pollution hardly occurs because the water flow hardly changes. In addition, the agitation and suction type dredging requires a large-scale facility, and the facility cost is very high.

Therefore, an object of the present invention is to construct a structure in which the sludge deposited on the lake bottom is sucked into the tank together with water by a vacuum pressure to separate the sludge from the water, and the sludge is efficiently collected so as not to pollute the water quality. Well done quickly,
It is an object of the present invention to provide a method and a device for downsizing the device and reducing the equipment cost.

[0005]

In order to achieve the above object, a method for recovering a vacuum sludge using a barge according to claim 1 is a suction pressure of a roots type multistage vacuum pump together with water from a sludge on the lake bottom from a suction hose. Is sucked into the closed separation tank in the hold by the sludge, the sludge is allowed to settle in the separation tank, and the supernatant water is discharged out of the ship from the discharge port of the separation tank by the discharge pressure of the roots-type multistage vacuum pump. It is what

In order to achieve the same object, a vacuum type sludge recovery device using a barge according to a second aspect is a separation for separating water and a plurality of sludges enclosed by a hatch cover in the barge of the barge. A roots-type multistage vacuum pump is provided with a tank, and a suction pipe for connecting a suction hose that sucks up sludge on the lake bottom with water and a communication pipe connected to the suction port of the roots-type multistage vacuum pump are provided above the separation tank. The clear water is discharged from the discharge port of the separation tank to the outside of the ship by the discharge pressure of.

In order to achieve the above-mentioned object, a vacuum sludge recovery method using a barge according to a third aspect is such that the sludge on the bottom of the lake is sucked from a suction hose together with water into a suction tank by the suction pressure of a roots type multistage vacuum pump. , When the suction tank is full, the discharge pressure of the roots-type multi-stage vacuum pump discharges sludge and water to a sludge separation tank provided in the hold, and a part of the supernatant water is discharged to the outside of the ship in a timely manner. The sludge is allowed to settle in the sludge separation tank, the supernatant water is discharged to the outside of the ship, and a part of the supernatant water in the sludge separation tank is circulated to the suction tank.

In order to achieve the same object, a vacuum sludge recovery apparatus using a barge according to a fourth aspect is provided with a single or a plurality of closed suction tanks on the deck of the barge. A suction pipe that connects the suction hose that sucks up the sludge on the lake bottom with water and a communication pipe that is connected to the suction port of the roots-type multistage vacuum pump are provided in the upper part of the, and the discharge port of the suction tank is provided in the hold. Provided with a return pipe connected to the sludge separation tank to circulate a part of the supernatant water in the sludge separation tank from the water inlet with float to the suction tank, and when the suction tank is full, a roots-type multistage The discharge pressure of the vacuum pump is used to discharge sludge and water into the sludge separation tank, and a portion of the supernatant water is discharged out of the ship through the drain port provided in the suction tank. And butterflies.

In addition, in order to achieve the above-mentioned object, claim 5
The invention described in (1) is characterized in that, in the vacuum sludge recovery device using the barge described in (2) or (4), a strainer rotatably supported is provided at the tip of the suction hose.

[0010]

According to the first and second aspects of the present invention, the sludge deposited on the bottom of the lake is sucked into the separation tank in the hold from the suction hose together with water by the suction pressure (normal rotation) of the roots type multi-stage vacuum pump, Settle in the tank. When the separation tank is filled with sludge and water, the roots-type multistage vacuum pump switches from forward rotation to reverse rotation and sends compressed air to the tank. Therefore, the supernatant water separated from the sludge is discharged to the outside of the ship from the discharge port of the separation tank by the discharge pressure of the pump. When the water level of the supernatant water in the separation tank drops to a certain level, the pump again switches to normal rotation and begins to suck sludge and water into the tank. The action of inhalation and the discharge of supernatant water are repeated to increase the concentration of sludge. Then, the sludge that has settled in the separation tank is collected outside the tank in a timely manner by a separately equipped sludge carry-out device.

According to the third and fourth aspects of the invention, the sludge deposited on the bottom of the lake is transferred from the suction hose to the suction tank on the deck together with water by the suction pressure (normal rotation) of the roots type multi-stage vacuum pump. Inhaled and temporarily settled in the tank. When the suction tank is full, the roots-type multistage vacuum pump switches from normal rotation to reverse rotation and sends compressed air to the tank. Therefore, sludge and water are discharged into the sludge separation tank from the discharge port of the suction tank by the discharge pressure of the pump. At this time, a part of the clear water is discharged out of the ship through the drain port in a timely manner. When the sludge and water are almost completely discharged, the pump again switches to the normal rotation and starts sucking sludge and water into the suction tank. In addition, a part of the supernatant water in the sludge separation tank is circulated from the water intake port with the float to the suction tank in a timely manner (when the amount of the supernatant water becomes large). Such suction and discharge actions are repeated to increase the concentration of sludge in the sludge separation tank. Similarly to the above, the sludge that has settled in the sludge separation tank is collected outside the tank in a timely manner by a separately provided sludge carry-out device.

Further, in the vacuum sludge recovery device using a barge according to claim 2 or 4, since the strainer provided at the tip of the suction hose rolls on the accumulated sludge, the sludge is efficiently sucked. Is preferred.

[0013]

Embodiments of the present invention will be described below. FIG. 1 is a side view showing the entire vacuum sludge recovery apparatus using a barge according to the first embodiment, FIG. 2 is a partially enlarged view of a main part according to the same embodiment, FIG. 3 is a front view of a strainer, and FIG. FIG. 5 is a schematic view for explaining the usage state of the same embodiment, and FIG. 5 is a side view showing the entire vacuum sludge recovery apparatus using a barge according to the second embodiment.

(First Embodiment) In FIGS. 1 and 2, A indicates a vacuum sludge recovery device, which divides a cargo hold 2 of a barge 1 and seals an opening 5 of an upper portion 4 which is a ceiling by a hatch cover 6. A single or a plurality of small-capacity separation tanks 3 are provided. The hatch cover 6 is manually clamped and fixed by a clamp 7. In the upper part 4 of the separation tank 3, a suction pipe 9 provided with a suction valve 8 which is manually or electromagnetically operated, and a communication pipe 10 which is connected to a suction port of a roots type multi-stage vacuum pump p installed on the deck 1a. Set up. 1
Reference numeral 1 is a butterfly valve with a float for opening and closing an opening 12 of a communication pipe 10 communicating with the separation tank 3 in order to prevent the supernatant water w from entering the pump p, and 13 is a communication pipe 1
It is a shutoff valve provided at zero. Reference numeral 14 denotes a discharge port for the supernatant water w which is opened in the side plate 3a above the separation tank 3, and a discharge check valve 15 is provided at the discharge port. Further, a water outlet 2a for discharging the supernatant water w discharged from the separation tank 3 to the outside of the ship is provided on the side of the barge 1.

The roots type multi-stage vacuum pump p requires a required horsepower of 50 to 75 Kw and a capacity of about 4000 m ³ / H, sucks the air in the separation tank 3 at the time of normal rotation, and functions as a compression pump at the time of reverse rotation. It is a thing. In order to perform the normal operation and the reverse operation of the pump p, an upper limit switch S ₁ and a lower limit switch S ₂ for detecting the water level of the supernatant water w are installed in the separation tank 3. The detection signals from the switches S ₁ and S ₂ are transmitted to the motor that drives the pump p or the control device of the engine device. A suction hose 16 made of a rubber hose or the like for sucking up the sludge m together with water is connected to the inlet portion 9a of the suction pipe 9. Reference numeral 17 is a strainer attached to the tip portion 16a of the suction hose 16. As shown in FIG. 3, the strainer 17 is
Both ends of a branch pipe 19 projecting from the center of the mounting pipe 18 are bent to be parallel, and further, both end portions thereof are bent inward to provide end pipe portions 20 that face each other in a straight line. A rotary strainer 21 having a cage-shaped cylindrical slit 22 is rotatably supported.

In the strainer 17, the air lift of sludge (here, it means to raise sludge and water by the expansion action of air in water) is used, but it is a conventional means, but it is carried out as follows. In some cases. When the water depth is within 2 to 3 m, the air intake pipe described in Japanese Patent Publication No. 48-18637 (FIG. 2) relating to the present inventor is provided to suck in the atmosphere, and the water depth is 4 m or more. In this case, the compressed air having a capacity of about 100 l / min is supplied from the suction portion.

A crane 30 for hoisting the hatch cover 6 and a guide frame 32 for running a hoist 31 for hoisting the suction hose 15 are erected on the deck 1a of the barge 1. G is a glove bucket type sludge carry-out device separately provided to collect the sludge m that has precipitated in the separation tank 3.

According to the vacuum sludge recovery method and the apparatus A thereof having the above-described structure, as shown in FIG. 4, the barge 1 is floated on the dam D and the sludge m deposited on the bottom of the lake is transferred to the roots type multistage vacuum pump p. By suction pressure (normal rotation), water is sucked together with water from the strainer 17 at the tip of the suction hose 16 into the separation tank 3 which is closed by the hatch cover 6 in the hold 2. The sludge m naturally precipitates in the tank 3 and separates from water. When the separation tank 3 is filled with sludge m and water, this is detected by the upper limit switch S ₁ , and the roots type multi-stage vacuum pump p switches from normal rotation to reverse rotation and sends compressed air to the tank 3. Therefore, the supernatant water w separated from the sludge m is discharged from the discharge port 13 of the separation tank 3 by the discharge pressure of the pump p, and the water discharge port 2a is discharged.
Will be released overboard. At this time, the suction valve 8 is closed. Next, when the supernatant water w is discharged and the water level of the supernatant water w in the separation tank 3 is lowered to a predetermined position, this is detected by the lower limit switch S ₂ , and the pump p is automatically switched to normal rotation, and again. Start sucking sludge m and water into the tank 3. The action of inhalation and the discharge of the supernatant water are repeated to increase the concentration of sludge m.

To recover the sludge m that has settled in the separation tank 3, the clamp 7 is removed, the hatch cover 6 is opened, and the sludge unloader G, which is separately provided, is inserted from the opening 5.
This sludge carry-out device G is used to transfer the sludge m to a place outside the scooping barge 1. When a plurality of separation tanks 3 are provided, suction and discharge are stopped by closing the suction valve 8 and the shutoff valve 13 for each tank 3, so whether or not this recovery device A is operating. Regardless of whether or not the sludge m is collected, the work can be efficiently performed.

(Second Embodiment) FIG. 5 shows a vacuum sludge recovery device B using a barge according to a second embodiment. In the following, the same components as those in the first embodiment are designated by the same reference numerals, the description thereof will be omitted, and different portions will be described.
Reference numeral 103 denotes a single or a plurality of sealed suction tanks installed on the deck 1a of the barge 1, and a bottom portion 103a of the tank 103 is formed in an inclined shape to facilitate discharge of sludge and water. . Lower bottom 103a
Has a discharge port 141 for discharging sludge m and water,
A check valve 142 for discharging sludge is provided at the outlet. 1
Reference numeral 43 is a discharge pipe provided with a discharge valve 144 for connecting the discharge port 141 and the large-capacity sludge separation tank 140 provided in the hold 2. Since the sludge separation tank 140 does not need to be maintained at a negative pressure, it is open to the atmosphere side. On the bottom 103a side above the suction tank 103, a water suction port 145 for circulating a part of the supernatant water w in the sludge separation tank 140 to the suction tank 103 is opened, and a water suction check valve 146 is provided at the inlet. To provide. Reference numeral 147 is a return pipe provided with a water absorption valve 148 for connecting the water intake port 145 and the sludge separation tank 140. 149 is a water inlet with a float provided in the sludge separation tank 140 for sucking up a part of the supernatant water w, which is connected to the return pipe 147 by a long hose 150 having elasticity such as rubber.

According to the vacuum sludge recovery method and the apparatus B thereof having the above-mentioned constitution, sludge m deposited on the lake bottom is
By the suction pressure (normal rotation) of the roots-type multi-stage vacuum pump p, the water is sucked into the suction tank 103 from the strainer 17 at the tip of the suction hose 16. The tank 103
When the inside becomes full of sludge m and water, this is detected by the upper limit switch S ₁ , and the roots type multi-stage vacuum pump p switches from normal rotation to reverse rotation and sends compressed air to the tank 103. Therefore, sludge m and water are
Discharge port 1 of suction tank 103 depending on the discharge pressure of
It is discharged into the sludge separation tank 140 from 41 through the discharge pipe 143. When the sludge m and the water are almost completely discharged, the pump p is switched to the normal rotation again to start sucking the sludge m and the water into the suction tank 103. Moreover, when the amount of the supernatant water in the sludge separation tank 140 becomes large, a part of the supernatant water is sucked up from the water intake port with a float 149.
03 and circulate accordingly. By repeating such suction and discharge actions, the concentration of sludge m in the sludge separation tank 140 is increased.

Similar to the first embodiment, the sludge separation tank 14
The sludge m that has settled in 0 is collected by timely transferring it to a place outside the barge 1 by a sludge carry-out device G separately provided. Since the sludge separation tank 140 in this embodiment has a large capacity that almost occupies the hold 2, it is possible to recover a large amount of sludge m at one time.

[0023]

EFFECTS OF THE INVENTION The present invention has the configuration and operation described above, and the sludge accumulated on the bottom of the lake is sucked into the tank together with water by the negative pressure by the roots type multistage vacuum pump, and the sludge is precipitated in the tank or the separation tank. Since the water is not stirred when the sludge is collected, the water quality is not polluted and the collection work can be performed efficiently and quickly. Further, there is an advantage that the device can be downsized and the equipment cost can be reduced.

[Brief description of drawings]

FIG. 1 is a side view showing an entire vacuum sludge recovery device using a barge according to a first embodiment.

FIG. 2 is a partially enlarged view of a main part according to the embodiment.

[Figure 3] Front view of the strainer

FIG. 4 is a schematic diagram illustrating a usage state of the same embodiment.

FIG. 5 is a side view showing the entire vacuum sludge recovery device using a barge according to the second embodiment.

[Explanation of symbols]

A, B → Vacuum sludge recovery device D → Dam G → Sludge unloader S ₁ → Upper limit switch S ₂ → Lower limit switch m → Sludge p → Roots type multi-stage vacuum pump w → Clear water 1 → Barge 1a → Deck 2 → Hold 2a → outlet 3
→ Separation tank 3a → Side plate 4 → Upper part 5 → Opening part 6 → Hatch cover 7 → Clamp 8 → Suction valve 9 → Suction pipe 9a → Inlet part 10 → Communication pipe 11 → Butterfly valve with float 12 → Opening 13 → Shut-off valve 14-> discharge port 15-> check valve for discharge 16-> suction hose 16a-> tip 17-> strainer 18-> mounting pipe 1
9 → branch pipe 20 → end pipe 21 → rotary strainer 22 → slit 30 → crane 31 → hoist 32 → guide frame 103 → sucking tank 103a → bottom 140 →
Sludge separation tank 141 → discharge port 142 → sludge discharge check valve 1
43 → Drain pipe 144 → Drain valve 145 → Water inlet 146 → Water check valve 147 → Return pipe 148 → Water inlet valve 149 → Float water inlet 150 → Hose

Claims (5)

[Claims] 1. Sludge from the bottom of the lake is sucked together with water from a suction hose into a closed separation tank in a hold by suction pressure of a roots-type multi-stage vacuum pump, the sludge is precipitated in the separation tank, and the supernatant water is roots. Vacuum sludge recovery method using a barge, characterized in that the discharge pressure of the multistage vacuum pump discharges the gas from the discharge port of the separation tank to the outside of the ship. 2. A separation tank for separating water from a single or a plurality of sludges sealed by a hatch cover is provided in the barge hold, and a suction hose for sucking up the sludge on the lake bottom with water is connected to the upper part of the separation tank. A suction pipe and a communication pipe connected to the suction port of the roots-type multi-stage vacuum pump are provided, and the supernatant water is discharged out of the separation tank by the discharge pressure of the roots-type multi-stage vacuum pump. Vacuum sludge recovery device using a barge. 3. Sludge from the bottom of the lake is sucked into the suction tank from the suction hose together with water by the suction pressure of the roots type multi-stage vacuum pump, and when the suction tank is full, it is discharged by the discharge pressure of the roots type multi-stage vacuum pump. The sludge and water are discharged to a sludge separation tank provided in the hold, and a part of the supernatant water is discharged to the outside of the ship in a timely manner, and the sludge is settled in the sludge separation tank to discharge the supernatant water to the outside of the ship. A vacuum sludge recovery method using a barge, characterized in that a part of the supernatant water in the sludge separation tank is circulated to a suction tank. 4. A single or a plurality of closed suction tanks are provided on the deck of a barge, and a suction pipe for connecting a suction hose for sucking sludge on the lake bottom with water is provided above the suction tanks, and a roots type. Provided with a communication pipe connected to the suction port of the multi-stage vacuum pump, the discharge port of the suction tank was connected to the sludge separation tank provided in the hold, and a part of the supernatant water in the sludge separation tank was fitted with a float. A return pipe is provided for circulation from the suction tank to the suction tank, and when the suction tank is full, the discharge pressure of the roots-type multistage vacuum pump discharges sludge and water into the sludge separation tank, and A vacuum sludge recovery device using a barge, characterized in that the part is discharged to the outside of the ship from the drain port provided in the suction tank. 5. The vacuum sludge recovery apparatus using a barge according to claim 2 or 4, wherein a strainer rotatably supported is provided at the tip of the suction hose. Type sludge recovery device.