JPH08126899A - Soil solidification treatment pumping equipment - Google Patents

Abstract

(57) [Summary] [Objective] To provide a solidification treatment pumping facility for softened sludge, which is capable of automatically and continuously mixing and solidifying the stored sludge. A soft mud supply device 100 including a soft mud tank 110, a flow rate adjusting means 120, and a flow meter 130, a solidification agent supply device 300 including a solidification agent silo 310, a solidification agent supply device 320, and a vertical screw conveyor 330, It comprises a pressurizing pump 410, a discharge pipe 420, and a soft mud pressure feeding device 400 including an ejector 430.

Description

Detailed Description of the Invention

[0001]

[Field of Industrial Application] The present invention continuously and uniformly adds a solidifying agent to soft soil such as mud dredged and collected in rivers, lakes and marshes, sewage sludge and dehydrated sludge in sewage treatment plants, etc. The present invention relates to a solidification treatment pressure-feeding facility for soft mud transferred by transportation.

[0002]

2. Description of the Related Art Conventionally, in order to knead and solidify such soft mud, a certain amount of soft mud and a solidifying agent corresponding to this quantity are put into a tank and mixed with a kneader having an agitation function attached to the tank or portable. The mixture was uniformly mixed by manually stirring it with the stirrer of No. 1, or the soft mud contained in the container and the solidifying agent were mixed with each other by human manipulation using a civil construction equipment such as a backhoe.

[0003]

The above-mentioned kneading in the tank and kneading by the operation of the stirrer or the civil construction equipment are all batch processes, which not only take a lot of time and are complicated, but also mud feeding. , Operations such as solidifying agent addition, kneading, and discharging are performed intermittently, resulting in poor work efficiency.
If the flow rate of the treated soft mud changes momentarily, it is difficult to deal with this promptly, and since the proper solidifying agent that does not match the flow rate is not mixed, there is a problem that the strength of the solidified softened sludge produced is not constant. It was For this reason, there has been a strong demand for a method of efficiently and automatically mixing the solidifying agent that matches the flow rate of the soft mud.

[0004]

In order to solve the above-mentioned problems, in the present invention, a softening agent is uniformly mixed with the stored softening agent, mixed with a discharging pipe, and pressure-fed in the discharging pipe. A solidification treatment pressure-feeding facility, wherein a sludge tank having a flow rate adjusting means at its outlet for storing soft sludge, a soft mud pressure feeding device following the flow rate adjusting means for pressure-feeding soft mud, and a solidifying agent for the soft sludge during the transfer of the soft mud A solidification agent supply device for adding, the soft mud pressure feeding device is composed of a pressurizing pump following the flow rate adjusting means, a discharge pipe and an ejector for injecting compressed air disposed in the middle of the discharge pipe, The solidifying agent supply device is composed of a solidifying agent silo, a solidifying agent feeder that is connected to the solidifying agent silo and is connected to the upstream side of the pressurizing pump, and a vertical screw conveyor. Further, in the second invention, the check valve is arranged between the pressurizing pump of the first invention and the ejector. Further, in the third invention, a flow meter is arranged downstream of the flow rate adjusting means of the soft mud tank, and the solidifying agent supply machine is controlled through the control device so that the solidifying agent supply amount is adapted to the soft mud flow rate. And

[0005]

In the present invention, the soft mud stored in the soft mud tank is transported by air to a distant transfer place such as a landfill, and an appropriate amount of the solidifying agent is added in the course of the process, and the kneaded mixture is sufficiently kneaded to soften the mud and the solidifying agent. And are mixed sufficiently uniformly and transferred to the destination. That is, the soft mud in the soft mud tank is discharged by gravity from the lower discharge port, is discharged in a substantially fixed amount by the flow rate adjusting means and is transferred to the subsequent pressurizing pump, and is added by the solidifying agent supplying device on the way. The pressure is increased by the pressure pump together with the solidifying agent, and is sufficiently kneaded during transfer by the discharge pipe and is plug-transported by the compressed air supplied by the ejector to be discharged to a distant destination. When the check valve is provided between the pressurizing pump and the ejector, the backflow of the soft mud in the discharge pipe is prevented, and the smooth transfer of the soft mud is ensured. Further, the flow rate discharged from the soft mud tank is constantly measured by a flow meter provided after the flow rate adjusting means, and an appropriate amount of the solidifying agent that matches the soft mud flow rate is controlled according to the change in the soft mud flow rate, so that the solidifying agent is appropriate. The soft mud is mixed at a fixed ratio.

[0006]

Embodiments of the present invention will be described below in detail with reference to the drawings. 1 to 4 relate to an embodiment of the present invention,
FIG. 1 is an overall configuration diagram of the solidification processing pressure-feeding equipment, FIG. 2 is a detailed vertical cross-sectional view of a main part of the solidification processing pressure-feeding equipment, FIG. 3 is a schematic explanatory view showing various embodiments of a flow rate adjusting means, and FIG. It is a schematic explanatory drawing showing various examples of a machine. As shown in FIG. 1, the sludge solidification treatment pressure-feeding equipment 1000 of the present invention is a steel sheet sludge tank 11 provided with a flow rate adjusting means 120 at the discharge port.
The soft mud supply device 100 consisting of 0, the soft mud pressure feeding device 400 following the soft mud tank 110, and the solidifying agent feeding device 300 for adding the solidifying agent to the upstream side of the soft mud pressure feeding device 400. As the flow rate adjusting means 120, various types shown in FIG. 3 are used. That is, valves such as a knife gate valve 120a, a butterfly valve 120b, and a ball valve 120c and a cutoff gate 120d, or feeders such as a rotary feeder 120e, a belt feeder 120f, an apron feeder 120g, and a screw feeder 120h can be used. The soft mud tank 110 and the flow rate adjusting means 120 are referred to as a soft mud supply device 100.
A flow meter 130 is provided after the flow rate adjusting means 120.

1 and 2 on the way to the soft mud supply device 100 consisting of the soft mud tank 110, the flow rate adjusting means 120 and the flow meter 130, and the path to the pressurizing pump 410 of the soft mud pumping device 400 described later. So that the solidifying agent supply device 3
00 is provided. The solidifying agent supply device 300 includes a solidifying agent silo 310 for storing the solidifying agent, a solidifying agent supplier 320 following the solidifying agent silo 310, a vertical screw conveyor 330, and a check valve 34.
It is formed from 0 and. The reason why the solidifying agent supply device 300 is connected to the discharge pipe 420 immediately before the pressurizing pump 410 is that the normal pressurizing pump 410 is always in a negative pressure state immediately before the pressurizing pump 410, and the solidifying agent is smoothly supplied. To the discharge pipe 42
This is because it can be sucked into 0 and mixed in the soft mud without any trouble. However, due to some unforeseen circumstances during operation, the discharge pipe 420 immediately before the pressurizing pump may have a positive pressure (plus pressure), and in this case, the solidifying agent to be added flows backward and hinders smooth supply. Trouble occurs.
As a measure for preventing such trouble, a check valve 340 is provided under the vertical screw conveyor 330 to prevent backflow, and the solidifying agent is strongly transferred to the discharge pipe 420 as a transfer means even in a slight positive pressure state. A vertical screw conveyor 330 that can be transferred is used. Vertical screw conveyor 3
No. 30 strongly transfers the solidifying agent downward without causing backflow even in the above-mentioned positive pressure state, so that the rotation speed thereof is variable in the range of 300 to 800 rpm. The reason for limiting the above numerical values is that the lower limit value of 300 rpm is likely to cause backflow below the upper limit value of 800 rpm.
Is because the backflow prevention effect remains the same even if the speed is higher than the actually generated plus pressure. Also,
The solidifying agent feeder 320 may be of any type, such as a table feeder, a piston feeder, and a belt feeder, as long as it can quantitatively supply the powdery solidifying agent, as shown in FIG. If attention is paid to the above-mentioned backflow countermeasure, it is desirable that the structure is simple, compact, and capable of supplying an arbitrary fixed amount and capable of being transferred and supplied in an airlock state. Then, in order to enable the solidifying agent supply device 320 to supply the solidifying agent addition amount that matches the flow rate of the soft mud measured by the flow meter 130 arranged immediately below the flow rate adjusting means 120, the motor 320 m is supplied via the control device 200. Is controlled to a rotation speed that gives an addition amount that matches the soft mud flow rate. In addition, the pressure pump 4
The result is confirmed by the flow meter 440 arranged behind the 10. The solidifying agent feeder 320 preferably has a closed structure including a closed cover in order to handle the powdery solidifying agent. Further, as shown in FIG. 2, a rotary feeder 320A equipped with an air lock mechanism is provided so that the back flow of the solidification agent does not occur due to the reverse pressure (plus pressure) from the soft mud tank 110 connected to the solidification agent feeder 320. Solidifying agent feeder 320
Can also be adopted. Further, in order to prevent such a back pressure trouble, a check valve 340 may be arranged immediately below the vertical screw conveyor 330.

Next, the soft mud pressure feeding device 400 will be described. The soft mud pressure feeding device 400 includes a pressurizing pump 410 following the soft mud feeding device 100, a discharge pipe 420 for transferring the soft mud after the pressurizing pump 410, and an ejector 430 for injecting compressed air provided in the middle of the discharge pipe 420. It is composed of a compressor 432 which is a supply source of compressed air. The soft mud mixed with the solidifying agent in the solidifying agent supply device 300 is a pressure pump 4
Pressurized at 10 and kneaded sufficiently, discharge pipe 420
The compressed air injected from the ejector 430 on the way is further transported by plug (transportation by plug), and is transported to a distant destination by air. Pressure pump 410
Between the ejector 430 and the ejector 430 is preferably a flow meter 440.
And a check valve 450 are provided, and the check valve 450 prevents the compressed air injected from the ejector 430 from flowing backward,
As described above, the flow meter 440 measures the flow rate of the soft mud after addition of the solidifying agent, while the flow meter 1 after the flow rate adjusting means 120 is measured.
The control unit 200, which receives the detection signal of the flow meter 130 that detects the flow rate of the soft mud, stores the set value of the supply amount of the solidifying agent that is adapted to the soft mud flow rate in advance, and stores the measured value of the soft mud flow rate during operation. The controller 2 controls the supply amount of the suitable solidifying agent.
00, and then sends an operation command to the drive device (motor) 320m of the solidifying agent supplier 320 to supply an appropriate amount of the solidifying agent to the vertical screw conveyor 330.

On the other hand, the solidifying agent supplying device 300 is connected between the soft mud supplying device 100 and the soft mud pressure feeding device 400 as described above, and the solidifying agent corresponding to the flow rate of the soft mud being transferred through the discharge pipe 420 is supplied. Solidifying agent silo 31
0 contains powder such as cement and cement-based solidifying agent, and the solidifying agent supply device 320 is, for example, as shown in FIG.
Rotary feeder, table feeder,
Adopting a feeder such as a piston feeder, flow meter 130
The motor 320 m is controlled in accordance with the actual flow rate of the soft mud measured in step 3, and the supply amount is adjusted. The solidifying agent may be a powder as it is or a slurry with water added, and the selection is determined by the degree of mixing depending on the soil. However, it is more economical to use the powder as it is, so use the powder as it is if there is not much difference. When the powder is sent, the solidifying agent supplied in a fixed amount by the solidifying agent feeder 320 is forcibly transferred downward by the vertical screw conveyor 330. The solidifying agent may be supplied as a powder, but depending on the soil quality, a slurry with water added is desirable in order to mix it uniformly with the soft mud.
In the case of slurry-like addition, the solidifying agent feeder 320 is provided with a storage tank equipped with a mixer (mixing stirrer), and a water supply line is connected thereto to make the powder solidifying agent into a slurry, which is constituted by a piston pump. ,Discharge. The solidifying agent is added at a ratio of 50 to 200 kg (usually 100 kg) to 1 m ³ of soft mud. In the present invention, as described above, the discharge pipe 42
In order to add a solidifying agent in advance to the soft sludge that is pneumatically conveyed in 0 and knead it sufficiently to make it uniform, the soft sludge and the solidifying agent are sufficiently mixed during the pressure-feeding action by the rotation of the blades of the pressure pump 410. They are discharged together, and evenly mixed evenly during plug transportation, and after reaching a remote destination, after a certain period of time (usually 2 to 7 days), they solidify beyond the required strength. In other words, the amount of solidifying agent added depends on the type of mud and soil and how many days later
The addition amount is determined depending on whether the strength of gf / cm ² is desired. As a matter of course, the larger the added amount, the faster and harder the solidified. As described above, the uniform mixing of the soft mud and the solidifying agent in the present invention is sufficiently performed in advance by the pressurizing pump 410 and then efficiently performed during the plug transportation in the discharge pipe. A length of at least 50 m in the past can further reduce the required length. In addition,
It is also possible to equip the dredger directly with the equipment of the present invention, to dredge soft mud such as sludge on the seabed, perform solidification treatment, and transport it to a distant destination. The feature of the present invention is that the solidifying agent and the soft mud are mixed firstly by one-stage mixing by rotation of a pressure pump and two-stage mixing by repeated operation of plug generation-breakage in plug transportation in a discharge pipe. -The point is that the stirring is sufficiently performed and the homogeneity (kneading degree) is very high. Further, in the present invention, as the solidifying agent supplying device 300, the solidifying agent supplied from the solidifying agent silo 310 is supplied to the vertical screw conveyor 330 and immediately before the pressurizing pump 410 by the head pressure of the soft mud in the vertical screw conveyor 330. Not only is it smoothly introduced into the negative pressure discharge pipe 420, but the solidifying agent does not flow backward even if a positive pressure is generated in the discharge pipe 420 for some reason. Further, since the solidifying agent supply device 320 can be a rotary feeder having an air sealing function, or a check valve can be provided directly below the solidifying agent supply device 320, the reverse flow of the solidifying agent can be prevented, so that a backflow trouble can be avoided. it can.

[0010]

Industrial Applicability As described above, the sludge solidification treatment pressure-feeding equipment of the present invention automatically feeds mud, solidifying agent, kneading, and discharge in a continuous operation. Moreover, since a solidifying and kneading step is not separately required, an efficient and uniform mixed and solidified soft mud can be obtained. Further, since the solidifying agent is introduced from the pressure pump, the solidifying agent is easily supplied, and the kneading with the soft mud is sufficiently performed, so that a more uniform mixed state is secured. Further, since the solidifying agent supply device has a function of preventing the reverse flow of the solidifying agent due to the positive pressure in the discharge pipe, the smooth supply of the solidifying agent is ensured.

[Brief description of drawings]

FIG. 1 is an overall configuration diagram of a solidification processing pressure-feeding facility according to an embodiment of the present invention.

FIG. 2 is a detailed vertical cross-sectional view of a main part of a solidification processing pressure-feeding facility according to an embodiment of the present invention.

FIG. 3 is a schematic explanatory view showing various embodiments of the flow rate adjusting means according to the present invention.

FIG. 4 is a schematic explanatory view of various solidifying agent feeders according to an embodiment of the present invention.

[Explanation of symbols]

 100 Soft Mud Supply Device 110 Soft Mud Tank 120 Flow Rate Adjustment Unit 130 Flow Meter 200 Control Device 300 Solidifying Agent Supply Device 310 Solidifying Agent Silo 320 Solidifying Agent Feeder 320A Rotary Feeder 320m Motor 330 Vertical Screw Conveyor 340 Check Valve 400 Soft Mud Pressure Feeding Device 410 Pressure pump 410a Motor 420 Exhaust pipe 430 Ejector 432 Compressor 440 Flowmeter 450 Check valve 1000 Solidification treatment pressure feeding facility

Claims (3)

[Claims] 1. A solidification treatment pumping facility for softened sludge in which a solidifying agent is uniformly mixed with the stored softened sludge, which is mixed with a discharge pipe and pressure-fed in the discharge pipe, wherein the discharge port has a flow rate adjusting means. A soft mud tank for storing the soft mud, a soft mud pressure feeding device following the flow rate adjusting means for pressure feeding the soft mud, and a solidifying agent supplying device for adding a solidifying agent to the soft mud during the transfer of the soft mud, the soft mud pressure feeding device is provided with the flow rate adjusting means. The solidification agent supply device comprises a pressurizing pump following the means, a discharge pipe, and an ejector for injecting compressed air disposed in the discharge pipe. A solidification treatment pumping facility for soft mud, which is composed of a solidifying agent feeder connected to the upstream side of a pressure pump and a vertical screw conveyor. 2. The solidification treatment pressurizing equipment for soft mud according to claim 1, wherein a check valve is provided between the pressurizing pump and the ejector. 3. The method according to claim 1, wherein a flow meter is provided downstream of the flow rate adjusting means of the soft mud tank, and the solidification agent supply machine is controlled by a control device so that the solidification agent supply amount is adapted to the soft mud flow rate. The solidification treatment pressure-feeding equipment of the soft mud according to claim 2.