JPH0474041B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a muddy water treatment device that processes muddy water generated at construction sites and the like to obtain purified water.

[Conventional technology]

Conventionally, in foundation work at construction sites, drilling fluid (with water or a collapse prevention agent added) and Since a large amount of soil hardening solution is used, a large amount of muddy water is discharged to the ground when the pile is erected or when the screw auger is pulled up.

This muddy water becomes a pollution problem if natural drainage is not possible, so the common method is to dig a pit near the construction site, temporarily store the muddy water in this pit, and then transport it out using a vacuum truck. It was hot.

However, when carrying out work using a vacuum truck, the construction speed is affected by its carrying capacity.
The cost of transporting waste varies depending on the distance to the dumping site, but it is very expensive. In addition, it is a nuisance in terms of space when working on-site, and the mud contained in the mud becomes more viscous over time, resulting in a drastic drop in suction efficiency into the vacuum car. .

In order to solve this problem, a muddy water treatment device installed in the machine frame is transported to a construction site to dewater the muddy water.

This mud water dewatering treatment device includes a vibrating sieve that pumps muddy water at the site and removes impurities, and a raw water storage tank that stores the muddy water discharged from the vibrating sieve machine.
Pump the muddy water in the raw water storage tank with a slurry pump,
A filter press machine that dewaters sludge contained in muddy water by compressing a filter frame and separates purified water;
It is equipped with a dehydration tank and other processing equipment to store filtered purified water (Special Public Interest Publication Act 1987-
(Refer to Publication No. 117310 and Japanese Patent Publication No. 147409/1983).

[Problem to be solved by the invention]

However, the muddy water dewatering equipment disclosed in the above-mentioned Japanese Patent Publication No. 57-117310 and Japanese Patent Publication No. 57-147409 is installed in an immovable machine frame.
A transport vehicle is used when transporting to or removing the mud water dewatering equipment from the construction site. It required construction equipment such as a crane and a large amount of time and manpower to lift it, which caused problems such as a delay in the construction period.

[Means to solve the problem]

In order to solve the conventional problems as described above, the present invention is configured so that installation and removal at a construction site can be performed easily and quickly, thereby shortening the construction period as much as possible. In addition, the purpose is to provide a muddy water treatment device that can efficiently separate purified water from muddy water generated at a construction site and reuse it, as well as reduce the cost of transporting and processing mud.
The gist is a vibrating screen that separates muddy water into mud and sewage, a classifier that separates the sewage from the vibrating screen into mud and sewage, a stirring tank that stores the sewage from the classifier, and a stirring tank that stores the sewage from the classifier. A decanter that separates sewage into mud and sewage, a filtrate tank that stores the sewage in the decanter, a storage tank for a chemical solution that is injected into the filtrate tank by a metering pump, and a polymer dissolution storage that stores a polymer flocculant. a liquid tank, a clarifier that separates wastewater into purified water and muddy water using a chemical solution and a polymer flocculant in the filtrate tank; a water tank that stores the purified water of the clarifier;
The muddy water treatment apparatus is characterized in that a conveyor for transporting the separated mud to the outside is incorporated into a movable loading platform.

〔Example〕

The present invention will be explained in detail below with reference to embodiments shown in FIGS. 1 to 4. In addition, FIG. 1 is a plan view of the muddy water treatment device according to the present invention, FIG. 2 is a front view of the same muddy water treatment device, FIG. 3 is a cross-sectional view taken along the line - in FIG. 1, and FIG. A flow sheet of the processing device is shown.

In the drawings, reference numeral 1 denotes a loading platform with wheels 2, which is either towed by a truck or the like and runs under its own power, or is driven by itself, such as a truck or a caterpillar. Equipment is installed.

That is, 3 is an underframe of a predetermined height fixed on the loading platform 1, and a vibrating screen 4 is installed on the underframe 3 to separate muddy water into muddy soil (coarse earth and sand, etc.) and sewage.

The lower part of the vibrating screen 4 is formed into an inverted conical shape, and a waste water outlet 4a is provided at the top thereof.

Reference numeral 5 denotes a classifier installed below the underframe 3, which separates mud into mud and sewage based on the difference in sedimentation speed of particles contained in the mud. A spiral crusher is used that separates particles depending on their specific gravity.

This spiral crusher 5 is the first
In the figure, there is a long tank 5a that slopes upward from the left side to the right side, and a spiral (helical blade) 5b that is rotatably arranged in the tank 5a.
The spiral 5b is an electric motor 6.
rotates through the belt.

Further, although not shown, a mud water inlet and a sewage discharge port are provided on the lower side of the tank 5a, and a mud discharge port is provided on the upper side thereof, and an inlet for the spiral crusher 5. A drain port 4a of the vibrating screen 4 is located above the vibrating screen 4, and a drain gutter 7 is connected downward to the drain port.

Further, below the classifier 5, a belt conveyor 8 driven by an electric motor (not shown) is installed in the left-right direction in the figure, and its right end protrudes from the loading platform 1 to load earth and sand onto the transport vehicle A. It has a simple structure (see Figure 4).

Reference numeral 9 denotes a stirring tank that stores the wastewater discharged from the drain port of the classifier 5, and a submersible sand pump 10 in the stirring tank 9 is connected to an inlet of a screw-type decanter 12 via a flow meter 11. ing.

This decanter 12 separates mud and sewage by rotating a screw (not shown) via a belt 13a by an electric motor 13, and the mud is discharged from the soil discharge port to the belt conveyor 8, and the mud is discharged from the drain port. The filtrate is drained into tank 14. Note that the decanter 12 is not limited to the screw type, and other types may be used.

15 is a liquid storage tank for PAC liquid;
The PAC liquid is supplied to the filtrate tank 14 via the metering pump 16.

The muddy water mixed with the PAC liquid in the filtrate tank 14 is
Clarify ear 1 by submersible sand pump 17
8. Further, the polymer flocculant in the polymer dissolution storage tank 19 is supplied to the Clarifier 18 by a metering pump 20 . In addition, 21, 2 in the figure
2 is a mixer consisting of a motor and a propeller.

Here, the clarifier 18 is a device that obtains purified water (clear water) from muddy water mixed with earth and sand, and depending on the size of fine particles contained in the muddy water,
Natural settling or coagulation sedimentation by chemical injection are selected. In the drawing, a coagulation-sedimentation method is selected in which the muddy water in the filtrate tank 14 mixed with the PAC liquid is injected with a chemical solution of a polymer flocculant.

The purified water purified by the Clarifier 18 is stored in a water tank 23 and supplied to necessary locations by a submersible sand pump 24. Furthermore, the sludge that has settled and separated at the bottom of the tank of the clarifier 18 is returned to the stirring tank 91 and processed again.
In addition, in the figure, 25 is a workbench.

[Effect of the embodiment]

Next, the processing steps of the above embodiment will be explained with reference to the flow sheet of FIG.

First, a pile pit C is excavated near the pile driving site B, the loading platform 1 is moved to the vicinity of the pile driving spot C, and a muddy water treatment device is installed. Therefore, the muddy water collected in the potter C is pumped up by a submersible sand pump D and supplied to the vibrating screen 4.

The vibrating screen 4 separates coarse sludge and sewage, and the sludge is transferred to a belt conveyor 8, and the sewage is supplied to a classifier 5 through a drain port 4a.

In this classifier 5, the sedimented sludge is conveyed upward by a spiral 5b and dropped from a drainage gutter 7 to a belt conveyor 8, and the sludge and sewage that have not completely settled are stored in a stirring tank 9 from a drain port.

In this stirring tank 9, an appropriate amount of sewage containing sludge is pumped by a submersible sand pump 10 to an inlet of a decanter 12 while being measured by a flow meter 11. The sludge separated by the decanter 12 falls onto the belt conveyor 8 as a dehydrated cake, and the waste water is stored in the filtrate tank 14.

The filtrate tank 14 contains PAC in the liquid storage tank 15.
The liquid is mixed in by a metering pump 16, and the sewage containing chemicals in the filtrate tank 14 is introduced into the Clarifier 18 by a submersible sand pump 17, and at the same time, the polymer flocculant in the polymer dissolution storage tank 19 is mixed in by the metering pump. 20 into the clarifier ear 18.

The wastewater is coagulated and sedimented by the chemical injection in the Clarifier 18, and purified water is stored in the water tank 23 and supplied to a desired location by the submersible sand pump 24. In addition, the sedimented muddy water is removed from the stirring tank 9.
will be returned to the factory for reprocessing.

The waste soil E such as sludge or cake discharged to the belt conveyor 8 in each of the above-mentioned treatment steps is loaded onto a transport vehicle A and disposed of at a predetermined disposal site.

〔Effect of the invention〕

As described above, the muddy water treatment device according to the present invention includes a vibrating screen that separates muddy water into muddy soil and sewage;
A classifier that separates the sewage from the vibrating screen into mud and sewage, a stirring tank that stores the sewage from the classifier, a decanter that separates the sewage from the agitation tank into mud and sewage, and a storage for the sewage from the decanter. A filtrate tank, a liquid storage tank for a chemical solution injected into the filtrate tank by a metering pump, a polymer dissolution liquid storage tank for storing a polymer flocculant, and a filtrate tank containing the chemical liquid and the polymer flocculant to form sewage. A clarifier that separates water into purified water and muddy water, a water tank that stores the purified water from the clarifier, and a conveyor that transports the separated mud to the outside are mounted on a movable platform. Installation and removal at a construction site can be easily and quickly carried out in a short time by a small number of workers, and construction efficiency can be greatly improved.

In addition, muddy water generated at construction sites can be easily purified to obtain purified water, and since this purified water can be immediately reused, there is no need to install a separate purified water storage tank.

Furthermore, since it is only necessary to carry out and dispose of unnecessary cake-shaped excavated soil, there are various effects such as being able to significantly reduce the cost of carrying out and also solving the problem of pollution at construction sites.

[Brief explanation of drawings]

FIG. 1 is a plan view of a muddy water treatment device according to the present invention;
Figure 2 is a front view of the muddy water treatment equipment, and Figure 3 is the front view of the muddy water treatment equipment.
The cross-sectional view taken along the - line in the figure, and FIG. 4 is a flow sheet of the muddy water treatment apparatus. 1... Loading platform, 4... Vibrating screen, 5... Classifier, 8... Belt conveyor, 9... Stirring tank, 10, 17, 24, D... Submersible sand pump, 12... Decanter, 14... Filtrate tank, 1
5... Liquid storage tank, 16, 20... Metering pump, 1
8...Clari Eyer, 19...Polymer dissolution storage tank, 23...Water tank, C...Kamaba.

Claims (1)

[Claims] 1 A vibrating screen that separates muddy water into mud and sewage, a classifier that separates the sewage from the vibrating screen into mud and sewage, a stirring tank that stores the sewage from the classifier, and a stirring tank that stores the sewage from the stirring tank into mud and sewage. a decanter that separates wastewater into wastewater, a filtrate tank that stores the wastewater in the decanter, a storage tank for a chemical solution injected into the filtrate tank by a metering pump, and a polymer dissolution storage tank that stores a polymer flocculant. , a clarifier that separates wastewater into purified water and muddy water using a chemical solution and a polymer flocculant in the filtrate tank, a water tank that stores the purified water of the clarifier, and a container that transports the separated mud to the outside. A muddy water treatment device characterized by incorporating a conveyor into a travelable loading platform.