JPH0232925B2 - - Google Patents

Description

[Detailed Description of the Invention] (Field of Industrial Application) This invention mainly applies to the addition of undiluted sludge from sludge and sediments from sea areas, rivers, lakes and marshes, soil and sand from the seabed, and other types of industrial wastewater. This invention relates to a pressure dehydrator that performs dehydration using pressure.

(Prior art) Conventionally, centrifugal dehydrators and vacuum dehydrators have been commonly used as dewatering equipment for treating sludge and slurry, but both have inferior dewatering efficiency.
It was structurally cumbersome and could not be adequately adapted to large-scale applications in which a large amount of raw water slurry was processed efficiently and quickly.
Further, a pressure dehydrator is known to have a better dehydration rate than the above two methods. However, the typical conventional pressure dehydrator is called a filter press, which is characterized by its great operational flexibility and can be applied to almost any raw material. It has drawbacks and requires a large number of filter plates and filter frames, making it unsuitable for efficiently dehydrating large-scale stock solutions such as sludge. In addition, in a pressure dehydrator, which is a method of separating solid and liquid by applying pressure, sufficient consideration must be given to the effective use of pressure means and filter media for filtration and dewatering, especially in the case of slurry with a high water content. However, in the past, there was no suitable pressure dehydrator.

(Technical Problem) In view of the above, the present invention has been developed to use a slurry stock solution such as sludge produced by subjecting sewage to coagulation sedimentation, coagulation flotation, biochemical treatment, etc. The technical problem is to reduce the water content of sludge by separating solid and liquid using an effective pressurized dewatering means, and to enable easy and appropriate transportation of the sludge.

(Prior Art Means) The present invention has been made to solve the above-mentioned technical problem, and the pressure dehydrator of the present invention will be described in detail below with reference to drawing examples.

Reference numeral 2 denotes a dewatering hopper at the lower part that is integrated with the frame 1, and water that has been separated and dehydrated and accumulated inside is drained to an appropriate location from a lower end drain port by a pump. 7 has a porous outer tube 3 having a large number of pores 3a and a large number of pores 4a on the outer periphery of which a filter material 5 such as a filter cloth is interposed between the porous outer tube 3 and a plurality of pores 4a. The dewatering pipe 7 is a dewatering pipe consisting of a concentric porous inner pipe 4, and the dewatering pipe 7 is horizontally installed in the front and back direction at its upper end facing the dewatering hopper 2, and has an outflow valve 11 interposed at its tip. This serves as an outflow pipe 12. Further, an inflow pipe 8 from an upper slurry hopper 9 is communicated with the dewatering pipe 7 through an inflow valve 10 . In addition, on the outer circumferential surface of the porous inner tube 4 with the filter medium 5 attached to the above-mentioned outer periphery, partition collars 6 for several filter mediums 5 and one communication port tube 18 on the upper surface are provided, and this filter medium 5 The porous inner tube 4 attached to the outer periphery can slide in and out of the porous outer tube 3 back and forth. In the contacting state position, the inflow pipe 8 communicates with the porous inner pipe 4 of the dewatering pipe 7 through the communication port pipe 18. 1
Reference numeral 3 denotes a dewatering plunger fitted into the porous inner pipe 4 of the dewatering pipe 7 so as to be able to move forward and backward from the rear end.
A dehydration cylinder is used as a dewatering cylinder. Therefore, the rod 15a of the piston 15 in the cylinder for dewatering, which is the plunger 13 for dewatering, has its base end pivotally connected to the support plate 14 on the upper rear side of the pedestal 1. Then, by hydraulic operation, the dewatering cylinder (dewatering plunger) 13 is connected to the fixed piston rod 15a.
moves back and forth. Reference numeral 16 denotes cylinders for replacing filter media that are attached to the left and right sides of the support plate 14, sandwiching the piston rod 15a pivot point of the dehydration plunger 13, and the tip of each piston rod 16a is connected to the dehydration pipe. They are respectively pivotally connected to both brackets 17 provided on the rear end flanges 4b of the porous inner tubes 4 of No. 7. By hydraulically operating both cylinders 16, the porous inner tube 4 can be freely moved in and out of the porous outer tube 3 with the filter medium 5 attached using the dewatering plunger 13 as a guide. Note that 19 is a belt conveyor for conveying the dewatered earth and sand flowing out from the outflow pipe 12 into the earth and sand hopper 23, and 24 is a dump truck. Also, 21 is
With the draught pump already developed by the inventor of the present application, which is installed on the dredge vessel 20, the soil and sand slurry that has been dredged by the dredge pump is transferred into the slurry hopper 9 through the soil discharge pipe 22. It is supplied and accommodated sequentially and intermittently.

(Function) First, as shown in FIGS. 1 and 2, with the dewatering plunger 13 retracted, the outflow valve 11 is closed and the inflow valve 10 is opened, and the slurry undiluted solution in the slurry hopper 9 passes through the inflow pipe 8 and flows into the dewatering pipe. When the dewatering pipe 7 is filled with water, the inflow valve 10 is immediately closed, and the dewatering plunger 13 is moved forward by hydraulic pressure.
The slurry stock solution in the porous inner tube 4 is dehydrated under pressure. At this time, by applying pressure, the slurry stock solution passes through the pores 4a of the porous inner tube 4, the filter medium 5, and the pores 3a of the porous outer tube 3, and is filtered and dehydrated. It is stored and pumped to a designated location. After dewatering as described above, the solid sediment is discharged from the outflow pipe 12 by opening the outflow valve 11 and pushing out the dewatering plunger 13, and is transferred to the sand hopper 2 by the belt conveyor 19.
3 is transported and transported to a predetermined location by a dump truck 24. Subsequently, the outflow valve 11 is closed again, the inflow valve 10 is opened, and when the slurry from the slurry hopper is filled from the inflow pipe 8 into the dehydration pipe 7, the inflow valve 10 is closed and the dewatering plunger 13 moves forward. Pressurized dewatering is performed intermittently by the dewatering plunger 13, and pressurized discharge of dewatered earth and sand is performed intermittently.

(Effects of the Invention) As described above, the pressurized dehydrator of the present invention sequentially fills and stores the slurry stock solution in the dehydration tube, which is composed of a porous outer tube and a porous inner tube with a filter medium interposed between them, and dehydrates the dewatering machine. Pressurized dewatering and extrusion of dehydrated earth and sand can be performed intermittently by the forward and backward movement of the plunger.It is a type that can use particularly high pressure in filter dewatering, and therefore dewatering is carried out extremely effectively. Although it is intermittent dehydration due to the plunger pressurized dehydration, high pressure dehydration can be performed efficiently.
For example, large amounts of earth and sand with a high moisture content can be efficiently dehydrated by dredging to lower the moisture content and be easily transported, and can be used in land reclamation work to significantly increase efficiency. It has a simple structure, does not require precision, is robust, has few failures, and requires no effort to operate.

In addition, the porous inner tube, on which the filter medium is removably attached to its outer periphery, can be moved in and out of the porous outer tube using the dewatering plunger as a guide, so that the porous inner tube can be pulled out from the porous outer tube. As a result, there are excellent effects such as replacing the filter medium with a new one when it becomes clogged, cleaning work by jetting fluid, etc., in a very rational, quick and easy manner.

[Brief explanation of drawings]

The drawings show an embodiment of the pressure dehydrator according to the present invention, in which Fig. 1 is a vertical side view, Fig. 2 is a plan view, Fig. 3 is a front view, and Fig. 4 is an example of a pressure dehydrator used in a dredging system. FIG. 1... Frame, 2... Dehydration hopper, 3... Porous outer tube, 3a... Fine hole, 3b... Rear end collar, 4... Porous inner tube, 4a... Fine hole, 4b... Rear end collar , 5... Filter medium, 6... Partition collar, 7... Dewatering pipe, 8... Inflow pipe, 9... Slurry hopper, 10... Inflow valve, 11...
... Outflow valve, 12 ... Outflow pipe, 13 ... Dewatering plunger, 14 ... Support plate, 15 ... Piston, 15
a... Rod, 16... Cylinder, 16a...
Rod, 17...Bracket, 18...Communication port pipe, 19...Belt conveyor, 20...Drainer, 21...Drain pump, 22...Earth discharge pipe, 23...Sediment hopper, 24... ...dump truck.

Claims (1)

[Claims] 1. A porous outer tube facing the dewatering hopper, and a porous inner tube with a filter material interposed between the porous outer tube and removably attached to the outer periphery, the tip of which is equipped with an outflow valve. The inflow pipe from the upper slurry hopper is connected to the dehydration pipe which has become an outflow pipe via an inflow valve, and a dewatering plunger that can freely move forward and backward from the rear end is fitted into the dewatering pipe, and the dewatering A pressurized dehydrator characterized in that the porous inner tube equipped with the filter medium can be moved in and out from the porous outer tube using a plunger as a guide.