JP2001347106A - Treating process and device for waste water containing light specific gravity fine particles - Google Patents

Abstract

PROBLEM TO BE SOLVED: To dehydrate waste water containing light specific gravity fine particles, which is difficult to treat with the conventional dehydrator. SOLUTION: The filtration of sludge and the washing of a filter are automatically executed in a dehydration treating vessel formed by fixing a filter plate on the upper surface of a circular tube or a lantern-like circular tube made of a flexible material such as a pressure resistant rubber by repeating the shrinkage and expansion of the volume and enabling to adjust a speed, time and pressure.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wastewater treatment apparatus for filtering fine particles of light specific gravity such as wastewater from an urban water purification plant, wastewater from shochu, and bentonite wastewater generated from civil engineering work.

[0002]

2. Description of the Related Art Among the above, wastewater of a water purification plant is subjected to solid-liquid separation and treatment using a large-scale dehydrator, or wastewater is stored in a large sedimentation pond and naturally dried. Some shochu effluents are equipped with treatment equipment in large factories, but capital investment is large and the economic burden is large.Small and medium-sized factories could not cope with them, and most of them relied on ocean dumping. In Japan, it has been decided to synchronize by 2001, and recycling of waste liquid is being developed, but no economical invention has been made in the solid-liquid separation method that is the premise of this. In addition, bentonite wastewater for civil engineering work is either left on the ground without any treatment method, or is taken out after mixing a solidifying material to reduce the water content.

[0003]

Accordingly, the present invention has been made based on the above problems. The characteristics of the wastewater to be treated in the present invention are such that the sedimentation is very slow due to the low specific gravity, and in the conventional dehydrator, a filter aid is required because clogging is difficult due to fine particles and a filtration layer is not easily formed, or organic wastewater is used. The introduction of biotechnology is required and the economic burden is large.
Therefore, in order to maintain the filtration ability for several tens of seconds until the filter is clogged at the initial stage of filtration, a method of performing backwashing in ten and several seconds has been developed, and this operation can be repeatedly performed. Unlike the conventional method, it is a filtration using only a filter cloth that does not generate a filter layer.Therefore, it is necessary to select a filter cloth that has a much lower air permeability, and the clogging also becomes faster. An object of the present invention is to provide a method and an apparatus having a function of adjusting the filtration time and the filtration speed.

[0004]

Means for Solving the Problems A cylindrical body which is squeezed downward with a flexible material such as pressure-resistant rubber and which has an open upper portion is constructed so that it can be compressed and expanded inward and outward from its surroundings or vertically. , A processing tank in which a filter plate is fitted on the upper part, and the inner volume of the processing tank is variable. When the internal volume of the processing tank is reduced, an internal pressure is generated and the wastewater in the processing tank becomes a solid-liquid separation process through a filter plate. When the volume is increased, outside air flows in from the filter cloth and the clogging of the filter cloth is removed. This is a construction method in which the action of The downwardly squeezed cylindrical processing tank that compresses and expands the increase / decrease of the volume in and out from the periphery of the body portion is repeatedly pressed and narrowed by horizontal rods from the left and right sides of the body portion, and is repeatedly released. . The lantern-shaped treatment tank, which compresses and expands in the vertical direction, changes the volume by pressing and pulling the periphery of the filter plate from above, and in all cases, the filtration pressure, filtration speed, and filtration correspond to the filtration characteristics of wastewater. The time can be adjusted with an air cylinder or the like.

In the structure of the present invention, a circular tube made of pressure-resistant rubber or the like is fixed by inserting a short tube 2 with a steel flange at the upper part as shown in FIG. 1, and a filter plate 3 is fitted and fixed therein. A discharge pinch valve is disposed below the circular tube, and a flattening pinch valve is disposed above the discharge pinch valve. The filter cloth is sandwiched between the filter plate edge plates, and both sides of the filter cloth are tensioned with a wire mesh or the like to prevent expansion to both sides. The cylinder 8 of the pinch valve for drainage and the cylinder 9 of the pinch valve for flattening are fixed by supporting rods 16 protruding from the columns of the gantry, respectively. The short pipe with flange is provided with a raw water inflow port, and its conduit has a solenoid valve 6 and a check valve 7
Is attached. As shown in FIG. 2, the shape of the processing tank is such that the body part is a lantern-shaped processing tank 1 ′ made of pressure-resistant rubber or the like. The lower part is connected to a steel plate conical tank 19 and the upper part is connected to a cylinder 20. ing. The lower outlet is a small-diameter water control valve 1.
The provision of 8 facilitates the adjustment of small-step discharge. The volume is made variable by pressing the processing tank with the pressing rod 21. The lower steel conical tank 19 is supported by a support rod 16 '.

[0006]

Operation and Embodiment Only the cylindrical processing tank of FIG. 1 having the above-described structure will be described. A circular pipe made of pressure-resistant rubber is used as the processing tank, and a filter plate 3 is inserted into the short pipe with a part of the upper steel flanged short pipe 2 inserted and fixed in the cylindrical processing tank 1. Adheres tightly. A slurry pump 5 is installed in the raw water tank 4, and an electromagnetic valve 6 and a check valve 7 are provided in a pumping line of the slurry pump 5 and communicate with an inlet.

As an operation, the cylinder 8 of the pinch valve for draining the lower part pushes the lower part of the cylindrical processing tank 1 to the pinch valve pressing rod 1.
It is flattened and closed until it comes in close contact with 2 '. When raw water flows into the treatment tank and fills up to the surface of the filter cloth, it is detected by the pressure gauge 10 and the solenoid valve is closed. When the cylinder 9 of the pinch valve for flattening is extended and the cylindrical processing tank is narrowed and flattened by the pinch valve pressing rod 12, the internal pressure is applied and the filtered water flows out onto the filter cloth surface, which is a filtration step. Immediately when the filter cloth is clogged and the pressure gauge 10 reaches a predetermined pressure, the cylinder 9 of the pinch valve switches to contraction and the flat portion returns. Since the inside of the tank becomes negative pressure, filter cloth 1
Air flows in from 3. This is the back washing step. The clogging of the filter cloth is released. The solenoid valve 6 is opened, and replenishment water flows. When the backwashing of the filter cloth is insufficient, the operation of inflow of raw water once every several times can be performed. The cylinder of the pinch valve for flattening again extends, and the circular pipe becomes flat. Thus 10
The filtration and backwashing are repeated every few seconds. The cylinder 8 of the drain pinch valve is opened a small amount by a timer and discharges little by little. The filtered water that has flowed out on the filter cloth flows into the toy 11 provided around the filter cloth, and falls from the outlet into the filtered water tank 15. The dotted line of the cylindrical processing tank in FIG. 1 illustrates the expected body dotted line 14 when flat.

[0008]

According to the present invention is the filtration efficiency per filter cloth 1 m ² becomes power cost is small cloth such consumables less maintenance costs insignificant at low pressure dehydration method for dehydrating a light specific gravity particles wastewater ratio in conventional dehydration method 3 to 5 times better. Since the structure is extremely simple, the occupied area is small, and the equipment cost is low, it can be sufficiently used even in a small factory and has an economic effect.

[Brief description of the drawings]

FIG. 1 is an internal structural view of an embodiment having a cylindrical processing tank.

FIG. 2 is an internal structure diagram of an embodiment having a lantern-shaped processing tank.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Cylindrical processing tank 1 'Lantern processing tank 2 Short pipe with steel flange 3 Filter plate 4 Raw water tank 5 Slurry pump 6 Solenoid valve 7 Check valve 8 Drain pinch valve 9 Flattening pinch valve 10 Pressure gauge 11 Toy 12 Pinch Valve pressing rod 12 'Pinch valve pressing rod 13 Filter cloth 14 Expected dotted line when pipe is flattened 15 Filtration tank 16 Support rod 16' Support rod 17 Upper beam 18 Water control valve 19 Steel conical tank 20 Cylinder 21 Press rod

Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat II (reference) B01D 29/38 510A 520A 540

Claims (2)

[Claims] 1. A flexible material such as pressure-resistant rubber, squeezed downward,
A cylindrical shape with an opening at the top, compressing inward and outward from the periphery or up and down, forming a body that can be expanded, a processing tank fitted with a filter plate at the top, the inner volume of the processing tank When the internal volume of the treatment tank is reduced, an internal pressure is generated and the wastewater in the treatment tank is separated into solid and liquid through a filter plate. Method to remove clogging,
The increase or decrease in the volume is compressed and expanded in and out from the periphery of the body, and the downwardly squeezed cylindrical processing tank is narrowed from the left and right sides of the body with a horizontal rod and flattened. The lantern-shaped treatment tank, which compresses and expands the body in the vertical direction to increase or decrease the volume, changes the volume by pressing and pulling the periphery of the filter plate from above, all of which correspond to the filtration characteristics of wastewater. A method for treating light specific gravity particulate wastewater, wherein the filtration pressure, filtration speed and filtration time can be adjusted with an air cylinder or the like. 2. In a cylindrical processing tank 1 suspended in a steel frame or in a lantern-shaped processing tank 1 'mounted in a stacked state, the body is made of a flexible material such as pressure-resistant rubber. The short tube part 2 of the short tube with a steel flange is inserted and adhered to the upper part, and the filter plate 3 is fitted into and adhered to the short tube. The cylindrical one is suspended from the upper beam of the frame at one flange portion of the short pipe, and the one with the body part of the treatment tank is lantern-shaped, the lower steel conical tank 19 is supported by the support rod 16 ', A short water pipe with a flange is provided with an inlet for raw water, a solenoid valve 6 and a check valve 7 are provided in the conduit, and a dewatered sludge is discharged with a cylindrical body, a pinch valve at the bottom, and a body lantern. An apparatus for treating wastewater of light specific gravity fine particles, characterized in that the apparatus has a solenoid valve.