JP2001252671A - Sewage treating device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To recycle industrial waste water by electrolytically purifying sewage, dehydrating sludge, collecting and caking the dehydrated sludge. SOLUTION: An electrolytic separator 5 is provided with an electrolytic cell 6 containing a soluble aluminum electrode plate 12, sewage is electrolyzed in the cell 6 with the water level regulated and separated into sewage and scum. The scum floating on the water surface is removed and discharged by the scraper of a scum discharging means 14. The primary treated water is transferred to a dehydrator 58 by a high-pressure pump 51, separated into water and sludge through the bag filter cloth of the dehydrator and secondary-treated. The caked sludge is discharged to the outside.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to sewage containing paint mist in a paint factory or sewage discharged in various production processes, such as sewage in a metal pretreatment process, colored sewage in a dyeing process, and printed circuit boards. The present invention relates to a sewage apparatus for dewatering and separating sewage and the like in a manufacturing process into water and sludge without using chemicals.

[0002]

2. Description of the Related Art Most of conventional sewage treatment methods are a coagulation sedimentation method or a redox method using chemicals. At the final stage, biological treatment, filtration treatment with an activated carbon filter, ozone sterilization treatment and the like are performed. However, all of them require high equipment costs, large installation space, and a lot of operating costs. However, the current situation is that business management may be oppressed.

[0003]

DISCLOSURE OF THE INVENTION The present invention has been made in view of such a situation.
It is an object of the present invention to provide a compact, efficient, and easy-to-use sewage treatment apparatus that has a lower facility cost, a smaller installation space, and a reduced running cost including power as compared to a conventional apparatus.

[0004]

For this purpose, the invention according to claim 1 is a method for converting wastewater such as wastewater containing paint mist in a coating factory into wastewater and scum by electrolysis using a soluble aluminum electrode. An electrolytic separation treatment device that is separated and subjected to a primary treatment, and a primary treatment water that is pressure-introduced from the electrolytic separation treatment device, includes a dehydration treatment device that is subjected to a secondary treatment by being dehydrated and separated into sludge and water, The electrolytic separation treatment device has an inlet through which sewage from a sewage pit flows into a lower portion, and an electrolytic cell in which a plurality of soluble aluminum electrode plates are arranged in parallel at intervals, Attached to the electrolytic cell,
And a scum discharging means including a scraper for removing floating scum on the water surface subjected to electrolytic treatment in the electrolytic cell through a scum discharge port, and a scum attached to the electrolytic cell and reliably removed and discharged by the scraper. A water level adjustment tank in which a water level adjustment plate for adjusting the water level in the electrolysis tank is provided, and an electrolysis water receiving tank that receives primary treatment electrolyzed water from the water level adjustment tank, wherein the dehydration treatment device is disposed in the axial direction. It is characterized by comprising an outer cylinder body divided into two parts and connected to be openable and closable, and a bag-shaped filter cloth body suspended from the outer cylinder body.

According to a second aspect of the present invention, in the electrolytic separation apparatus, the inside of the electrolytic cell is divided into a first electrolytic chamber and a second electrolytic chamber, and a plurality of soluble aluminum An electrode plate is arranged, and two dehydration apparatuses are arranged in parallel.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The sewage treatment apparatus according to the present invention is roughly divided into sewage such as scum containing paint mist in a paint factory, which is separated into sewage and scum. An electrolytic separation treatment device for primary treatment is provided, and a dehydration treatment device for secondary treatment of the primary treated electrolytic water is provided.In the electrolytic separation treatment device, electrolyzed water is dissolved by electrolysis using a soluble aluminum electrode. The scum separated from the scum and suspended on the electrolyzed water is removed and discharged by a scraper to perform a primary treatment. Then, the scum is dehydrated and separated into water and sludge (a dehydrated cake) by using a high-pressure pump in a dehydration treatment device. The following processing is performed.

[0007]

BRIEF DESCRIPTION OF THE DRAWINGS FIG.
A description will be given together with the operation. FIG. 1 is a flow chart of the whole, and FIG. 2 is a schematic front view of the whole. In these figures, the sewage from the sewage pit 1 is passed by a pump 2 through a pipe 3 and an intake valve 4 to an electrolytic separation treatment apparatus 5. Introduced, in the electrolytic separation processing apparatus 5, the water is separated into electrolyzed water and scum by electrolysis using a soluble aluminum electrode, and subjected to primary processing.

As shown in FIG. 3, the electrolytic separation processing apparatus 5 includes an electrolytic cell 6, which is a box-shaped top opening as an integrally molded product made of a hard synthetic resin material.
A substantially middle portion thereof is defined by first and second two electrolysis chambers 8 and 9 by an upright partition plate 7 from a bottom plate, and the bottom of each electrolysis chamber 8 and 9 is formed in a substantially funnel shape. A sewage inlet is opened in a substantially funnel-shaped portion of the first electrolytic chamber 8,
Sewage from the sewage pit 1 is introduced from this lower inlet. A horizontally long electrode locking block 10 is fixed to the lower part of the facing side plates in the electrolysis chambers 8 and 9, and a plurality of long electrode guide blocks 11 orthogonal to the block 10 are provided above the electrode locking blocks 10. A rectangular aluminum plate-shaped soluble aluminum electrode plate 12 is inserted between the guide blocks 11 and 11 at an appropriate interval in the longitudinal direction, and is arranged in parallel.

The sewage from the lower inlet of the first electrolysis chamber 8 is electrolyzed by the soluble aluminum electrode plate 12 while circulating from the lower part to the upper part, and the flocs in the sewage are scum A on the water surface. The scum A floats and is removed and discharged by means described later.

As shown in FIG. 3, the sewage in the first electrolysis chamber 8 flows into the second electrolysis chamber 9 through the partition plate 7 while being subjected to electrolysis, and 2 is a guide plate formed in the electrolysis chamber 9 and in parallel with a space between the front plate and the back plate with a space between the partition plate 7 and a lower portion parallel to a part of the funnel-shaped portion. The electrolyte is again electrolyzed by the soluble aluminum electrode plate 12 of the second electrolysis chamber 9 while circulating from the lower part of the second electrolysis chamber 9 to the upper part through the space between the second electrolysis chamber 13 and the partition plate 7. As floating on the water surface.

The scum A floating on the water surfaces of the first and second electrolysis chambers 8 and 9 is removed by a scum discharging means 14 provided substantially at the upper center of the electrolytic cell 6 and discharged to the outside.

The scum discharging means 14 is roughly divided into a driving section and a scraper.
As shown in FIG. 2, one end of the bearing axle 16
And a ball screw 20 having the other end horizontally connected via a joint 19 to a shaft 18 of a drive motor 17 mounted on the outer surface of the housing 15 so as to be freely rotatable. Ball nut 21 that moves forward and backward in the direction of the solid arrow with the reverse rotation
Are screwed together in a state of being fixed in the block-shaped nut housing 22.

As shown in FIGS. 7 and 8, a guide rail 23 is fixed below the ball screw 20 in parallel with the ball screw 20 in the longitudinal direction of the inner surface of the side plate of the housing 15. A slide pack 24 is engaged with the guide rail 23 via a bearing 25,
The slide pack 24 and the nut housing 22 are connected via two pieces 27 and 28 of a slider fitting 26 having a substantially Z-shaped cross section, and advance and retreat integrally with the ball nut 21. Are regulated by limit switches 31 attached to limit switch mounting brackets 30 in the front plate and the rear plate.

A scraper mounting plate 32, which is slightly shorter than the width of the electrolytic cell 6, is mounted on the free end piece 29 of the slider fitting 26 projecting outward from the lower end opening of the housing 15 so as to be orthogonal to the ball screw 20. At the same time, the scraper 33 is attached to the scraper attachment plate 32 at the left and right parts excluding the middle part thereof, respectively, in a downward direction.

The scum discharging means 14 constructed as described above
As shown in FIG. 2, FIG. 3 and FIG. 5, the front and rear side surfaces of the housing 15 protrude toward the front side of the electrolytic cell 6 and are integrally formed at the center of the integrally formed scum discharge port 34. The mounting piece 35 formed upright and the mounting plate 36 erected at a central portion on the back side of the electrolytic cell 6 are attached to the electrolytic cell 6.
It is erected in the central part of.

The scum A floating on the surface of the water electrolyzed in the first and second electrolysis chambers 8 and 9 cooperates with the ball screw 20 which rotates by receiving the rotation force of the driving motor 17 and rotates the ball nut. 21 moves forward and backward, and in conjunction with this, the slide pack 24 moves in parallel in the same direction along the guide rail 23, and each slide pack 24 is attached to the slide pack 24 via the slider Z bracket 26 and the scraper mounting plate 32. The scum is discharged from the scum discharge port 34 to the scum receiving tank 37 by the scraper 33.

The timing of scum discharge is controlled by a timer (not shown).
3 is stopped when the slide pack 24 contacts the front limit switch 31, and retreat is stopped when the slide pack 24 contacts the rear limit switch 31.

As shown in FIG. 9, the electrolytically treated water in the second electrolytic chamber 9 from which the scum A has been removed has an opening at a common side plate of the second electrolytic chamber 9 and the water level adjusting tank 38. Horizontal hole 39
The water flows into the water level adjustment tank 38 through the tank.

FIG. 10 and FIG.
As shown in FIG. 1, a fixed plate 40 is formed integrally and in an upright shape on the bottom plate so as to cover the entire width thereof. Are formed integrally and in an upright shape, and between the fixing plate 40 and the left and right guide plates 41, the water level adjusting plate 4
2 is inserted so as to be slidable in the vertical direction indicated by the solid arrow. Then, the water level adjusting plate 42 is appropriately moved upward, and the water level adjusting plate 42 is temporarily fixed at a predetermined position by abutting against the fixing plate 40 with the stopper 43, and the electrolytic cell 6 (first electrolytic chamber) 8 and the water level of the sewage in the second electrolysis chamber 9) is adjusted to a water level suitable for removing and discharging the scum A by the scraper 33.

The fixed plate 40 and the water level adjusting plate 42 are both triangular weirs whose upper sides are formed in a V-shape.
This is because the flow rate flowing into the water level adjusting tank 38 can be easily measured from the outside.

The electrolytic water flowing from the electrolytic cell 6 to the water level adjusting tank 38 is transferred from the outlet hole to the electrolytic water receiving tank 45 via the pipe 44.

The bottoms of the first electrolysis chamber 8 and the second electrolysis chamber 9 are connected to a pipe 48 via drain valves 46 and 47, respectively. The pipe 48 is connected to a scum receiving tank 37, , And drain from each of the electrolysis chambers 8 and 9 are piped to return to the sewage pit 1 through a pipe 48.

The primary treated water from the electrolytic water receiving tank 45 is supplied to a high pressure pump 51 via a pipe 49 and a water supply stop valve 50.
Is transferred to two dehydration processing units 58 via a pipe 52, a water supply stop valve 53, a three-way rotary valve 54, a pipe 55, a branch pipe 56, and a dehydration stop valve 57, and the sludge (dewatered cake) ) And water to be subjected to dehydration separation for secondary treatment.

The two dehydration processing devices 58 have the same configuration, and are divided into two in the axial direction and connected to be openable and closable by a plurality of opening / closing fittings 62, as shown in FIGS. 12 and 13. The upper and lower opening edges have a brim portion 60, and the free edge has a brim portion 61 in the axial direction, respectively. As shown in phantom lines in FIG.
And the joint of the collar portion 61 is a bolt,
It includes an outer cylinder 59 that is fastened and closed by a fixing tool 63 such as a nut.

On the upper part of the outer cylinder 59, an upper closing plate 64 having an inlet 65 for the primary treatment electrolyzed water at the center is provided. The lower part of the outer cylindrical body is fixed to a lower closing plate 67 having a drain port 68 at the center thereof with a fixing member 69 such as a bolt or a nut to a joint between the outer peripheral edge portion and the flange portion 61. Have been.

A pedestal 70 having a slightly smaller diameter than the lower occluding plate 67 and having a drain port 71 which is compatible with the drain port 68 is fixed on the lower closing plate 67. An upper surface is closed by a wire mesh or the like surrounding the drain port 71, and a drainage inner cylinder 72 having a lower surface opening is fixed upright, and a bag-shaped filter cloth is provided on an outer peripheral portion of the drainage inner cylinder 72. A body 73 is provided.

The bag-like filter cloth 73 is a filter cloth capable of collecting fine particles of 1 micron or more.
4 is a so-called trouser shape of a garment having a long-legged bag portion 75 branched in a bifurcated shape from the body 4, and the body portion 74 has an upper closing plate 64.
13 is attached to the lower surface of the container by a mounting plate 77 so as to surround the introduction port 65, and the branch portion is supported by the upper surface of the inner cylindrical body 72 for draining water. The two long-legged bag portions 75 are shown by imaginary lines in FIG. As it is, it is suspended in a substantially semicircular cross section,
Each lower end is folded several times to form a folding portion 76.
It is in a sealed state. In addition, the bag-like filter cloth 73
A draining net-like cylinder 78 is provided between the outer cylinder 59 and the outer cylinder 59.

The two dehydration devices 58 are arranged on a tray 79. The primary treated water press-fitted from the inlet 65 through each pipe and valve passes through both long-legged bag portions 75 from the body portion 74 of the bag-shaped filter cloth body 73 as shown by arrows in FIG. While flowing down, the water flows down in the drainage inner cylinder 72, and a part of the water enters the drainage mesh cylinder 78.
On the other hand, the sludge B contained in the primary treated water is supplied to the respective long-footed bag portions 7 sealed by the folding portions 76.
Collected in 5.

The secondary treated water filtered by the bag-shaped filter cloth 73 is collected in the receiving tray 79 from the outlets 71 and 68, and the secondary treated water by the two units is filtered from the common drainage port into the filtered water receiving tank 8
0, and is returned to the wastewater pit 1 by the filtered water return pump 81.

After the dewatering process is performed in this manner, the three-way rotary valve 54 is switched to stop the injection of the primary treated water, and then the compressed air from the compressor 83 is supplied to each inlet 65 by the operation of the electromagnetic valve 82. The sludge B introduced into each bag-shaped filter cloth body 73 and stored in each long-legged bag portion 75 is compressed by the pressure vibration of the compressed air, and this is automatically repeated until a complete cake state is obtained. . In this case, the volume of sludge,
The determination of the limit is determined by the pressure switch and the indicator 84, or by controlling the operation time by a timer or the like. As described above, the primary treatment of the sewage by the electrolytic separation treatment device 5 and the secondary treatment by the dehydration treatment device 58 are automatically performed by operating the control panel 85 including the electrolytic power supply.

When the sludge B in the bag-like filter cloth 73 is in a completely caked state, the operation is stopped and the fixing members 66, 69 of the upper and lower closing plates 64, 67 fixing the outer cylinder 59.
Is removed, and the fixing member 63 of the flange portion 61 that closes the outer cylinder 59 is removed, and the outer cylinder 59 is
As shown by the imaginary line in FIG. 13 with the fulcrum as the fulcrum, the long leg-shaped bag portion 75 is taken out, the folded portion 76 is opened, and the dewatered cake (sludge B) is taken out.

[0032]

According to the present invention, since the apparatus is a combination of the electrolytic separation processing apparatus and the dehydration processing apparatus, the overall size can be reduced, the equipment cost is low, and the installation space is small. It needs to be narrow.

Further, since the electrolytic separation treatment device has an electrolytic structure using a soluble aluminum electrode, it is easy to decompose wastewater in a mixed and emulsified state, and to purify water including a sterilizing action by hydrogen gas. Progresses.

Further, since the electrolytic tank is provided with a water level adjusting tank having a water level adjusting means, the water level in the electrolytic tank is always well adjusted and maintained, and the scum separated and floated on the sewage surface can be reliably detected. Can be removed and discharged with a scraper.

In the dewatering treatment apparatus, chemicals are unnecessary, and primary treatment water is poured under high pressure into a bag-like filter cloth capable of collecting fine particles to dewater and separate sludge, and further, compressed air is introduced. As a result, the dehydration efficiency is improved, and the sludge is formed into a cake.

In the dewatering treatment apparatus, caked sludge can be easily taken out of the bag-shaped filter cloth because the outer cylinder can be opened and closed in the axial direction.

[Brief description of the drawings]

FIG. 1 is a flowchart of an example of a sewage treatment apparatus according to the present invention.

FIG. 2 is a schematic front view of an example of the present invention.

FIG. 3 is a front view of a partial cross section showing a main part of the electrolytic separation device.

FIG. 4 is a partially enlarged cross-sectional view showing an arrangement state of a soluble aluminum electrode plate.

FIG. 5 is a front view of a partial section showing an electrolysis chamber portion.

FIG. 6 is a partially omitted front view showing a scum discharging unit.

FIG. 7 is a partial cross-sectional side view showing a main part of the scum discharging means.

FIG. 8 is a partially omitted cross-sectional view showing a mounting state of a slider Z bracket and other components in the scum discharging means.

FIG. 9 is a side view of an electrolytic cell and a water level adjusting tank which are partially cut away and partially omitted.

FIG. 10 is a front view showing an example of a water level adjusting unit.

FIG. 11 is a longitudinal sectional view of FIG. 10 with a part omitted.

FIG. 12 is a partially omitted longitudinal sectional view showing an example of a dehydration processing apparatus.

FIG. 13 is a cross-sectional view of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Sewage pit 5 Electrolysis separation processing apparatus 6 Electrolysis tank 7 Partition plate 8 1st electrolysis chamber 9 2nd electrolysis chamber 12 Soluble aluminum electrode plate 14 Scum discharge means 33 Scraper 34 Scum discharge port 38 Water level adjustment tank 39 Horizontal oblong hole 42 Water level adjustment plate 45 Electrolyzed water receiving tank 58 Dehydration treatment device 59 Outer cylinder 73 Bag-like filter cloth A A scum B Sludge

Claims (2)

[Claims] 1. An electrolytic separation treatment apparatus in which sewage such as sewage containing paint mist in a paint factory is separated into sewage and scum by electrolysis using a soluble aluminum electrode and subjected to primary treatment; A primary treatment water pressurized and introduced from the device is provided with a dehydration treatment device that is dehydrated and separated into sludge and water to be subjected to a secondary treatment. An electrolytic cell having an inlet, in which a plurality of soluble aluminum electrode plates are arranged in parallel at intervals and a water surface attached to the electrolytic cell and subjected to electrolytic treatment in the electrolytic cell. A scum discharge means including a scraper for removing floating scum through a scum discharge port, and a water surface in the electrolytic cell so as to be attached to the electrolytic tank and remove and discharge the scum by the scraper without fail. A water level adjustment tank in which a water level adjustment plate to be adjusted is installed, and an electrolyzed water receiving tank for receiving primary treatment electrolyzed water from the water level adjustment tank. A sewage treatment apparatus characterized by comprising an outer cylinder body provided and a bag-shaped filter cloth body hanging down in the outer cylinder body. 2. An electrolytic cell in the electrolytic separation treatment apparatus, wherein the inside of an electrolytic cell is divided into a first electrolytic chamber and a second electrolytic chamber, and a plurality of soluble aluminum electrode plates are arranged in each electrolytic chamber. 2. The sewage treatment apparatus according to claim 1, wherein two dehydration treatment apparatuses are arranged in parallel.