JP4194730B2 - Sewage treatment equipment - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention includes 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 sewage in a printed circuit board manufacturing process. The present invention relates to a sewage apparatus that performs dehydration and separation into water and sludge without using chemicals.
[0002]
[Prior art]
Most of the conventional sewage treatment methods are coagulation-precipitation method and oxidation-reduction method using chemicals, and biological treatment, filtration treatment with activated carbon filter, ozone sterilization treatment, etc. are made at the final stage. Large equipment costs, a large installation space, and a lot of operating costs also add a considerable burden to small businesses, putting pressure on business management It is the current situation that has become impossible.
[0003]
[Problems to be solved by the invention]
The present invention has been made in view of such a current situation, and the object of the present invention is that the equipment cost is lower, the installation space is smaller, and the running cost including electric power is reduced as compared with the conventional apparatus. An object of the present invention is to provide an efficient and easy-to-use sewage treatment apparatus that can be made compact.
[0004]
[Means for Solving the Problems]
For this purpose, the invention according to claim 1 is an electrolytic separation in which sewage such as sewage containing paint mist in a coating factory is separated into sewage and scum by electrolysis using a soluble aluminum electrode. A treatment device, and a dehydration device in which primary treated water introduced under pressure from the electrolytic separation treatment device is dehydrated and separated into sludge and water and subjected to a secondary treatment, and the electrolytic separation treatment device is disposed at a lower portion. An electrolytic cell having an inlet through which sewage from the sewage pit flows, a plurality of soluble aluminum electrode plates arranged in parallel at intervals, and an electrolytic cell attached to the electrolytic cell and electrolyzed A scum discharge means including a scraper for removing floating scum on the water surface electrolyzed in the tank through a scum discharge port; and attached to the electrolytic tank, and the scum is surely removed and discharged by the scraper. A water surface adjustment tank equipped with a water surface adjustment plate for adjusting the water surface in the electrolysis tank, and an electrolyzed water receiving tank that receives primary treated electrolyzed water from the water surface adjustment tank, and the dehydration apparatus is arranged in the axial direction. The present invention is characterized in that it includes an outer cylinder that is divided into two parts and that is connected to be openable and closable, and a bag-like filter cloth that is suspended from the outer cylinder.
[0005]
In the invention according to claim 2, the inside of the electrolytic cell in the electrolytic separation treatment apparatus is partitioned into a first electrolytic chamber and a second electrolytic chamber, and a plurality of soluble aluminum electrode plates are provided in each electrolytic chamber. The dehydration apparatus is arranged in parallel, and two of the dehydration processing apparatuses are arranged in parallel.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
DESCRIPTION OF EMBODIMENTS Embodiments of the present invention will be described. The sewage treatment apparatus according to the present invention can be broadly divided into electrolytic separation in which sewage such as sewage containing paint mist in a coating factory is separated into sewage and scum and subjected to primary treatment. A treatment device and a dehydration treatment device for secondary treatment of the electrolyzed water subjected to the primary treatment. In the electrolytic separation treatment device, the electrolyzed water is separated into electrolyzed water and scum by electrolysis using a soluble aluminum electrode. The scum floating on the water is removed and discharged by a scraper and subjected to a primary treatment, and then dehydrated and separated into water and sludge (dehydrated cake) using a high pressure pump in a dehydration processing device, and subjected to a secondary treatment.
[0007]
【Example】
Specific examples will be described below with reference to the drawings, together with the operation thereof.
FIG. 1 is an overall flow diagram, and FIG. 2 is an overall schematic front view. In these drawings, sewage from the sewage pit 1 passes through a pipe 3 and an intake valve 4 by a pump 2 to an electrolytic separation treatment device 5. Introduced and electrolyzed using a soluble aluminum electrode, the electrolytic separation treatment apparatus 5 separates the electrolyzed water and scum into primary treatment.
[0008]
As shown in FIG. 3, the electrolytic separation treatment apparatus 5 includes an electrolytic cell 6, and the electrolytic cell 6 is a box shape with an upper surface opening as an integrally molded product made of a hard synthetic resin material, and is substantially in the middle. The interior is partitioned and formed into first and second electrolysis chambers 8 and 9 by an upright partition plate 7 from the bottom plate, and the bottoms of the electrolysis chambers 8 and 9 are formed in a substantially funnel shape. A sewage introduction port is opened in a substantially funnel-shaped portion of the electrolysis chamber 8, and sewage from the sewage pit 1 is introduced from this lower introduction port. A horizontally long electrode locking block 10 is fixed to the lower part of the opposing side plates in the electrolysis chambers 8 and 9. Above these electrode locking blocks 10, a plurality of long electrode guide blocks 11 orthogonal to the block 10 are provided. A rectangular plate-like soluble aluminum electrode plate 12 is inserted between the guide blocks 11 and 11 from above, and arranged in parallel.
[0009]
And 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 floc in the sewage floats on the water surface as scum A, This scum A is removed and discharged by means described later.
[0010]
As shown in FIG. 3, the sewage in the first electrolysis chamber 8 flows into the second electrolysis chamber 9 over the partition plate 7 while being electrolyzed, and the electrolyzed water that flows in the second electrolysis chamber A guide plate 13 and a partition formed in the chamber 9 and in parallel with a space between the front plate and the rear plate with a space between the partition plate 7 and with the lower portion parallel to a part of the funnel-shaped portion. Electrolysis is again performed by the soluble aluminum electrode plate 12 in the second electrolysis chamber 9 while circulating between the plates 7 from the lower portion to the upper portion of the second electrolysis chamber 9, and the floc in the electrolyzed water becomes scum A on the surface of the water. To float.
[0011]
The scum A floating on the water surface of the first and second electrolysis chambers 8 and 9 is removed by the scum discharge means 14 attached to the substantially upper center of the electrolytic cell 6 and discharged to the outside.
[0012]
The scum discharge means 14 roughly includes a drive unit and a scraper, and the drive unit 15 is arranged in the upper longitudinal direction in the box-shaped housing 15 having a long bottom opening, as shown in FIGS. A ball screw 20 having one end supported by the bearing shaft 16 and the other end connected horizontally to the shaft 18 of the drive motor 17 attached to the outer surface of the housing 15 via a joint 19 is rotatably provided. A ball nut 21 that advances and retreats in the direction of the solid arrow in accordance with forward and reverse rotation of the ball screw 20 is screwed and attached in a state of being fixed in a block-shaped nut housing 22.
[0013]
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. The slide pack 24 is engaged with the nut 23 via a bearing 25, and the slide pack 24 and the nut housing 22 are connected via two pieces 27 and 28 of a slider metal fitting 26 having a substantially Z-shaped cross section. The forward / backward movement is integrated with the limit switch 31 attached to the limit switch mounting bracket 30 in the front plate and the rear plate of the housing 15.
[0014]
A scraper mounting plate 32 that is slightly shorter than the lateral width of the electrolytic cell 6 is attached to the free end piece 29 of the slider fitting 26 that protrudes horizontally from the lower end opening of the housing 15 so as to be orthogonal to the ball screw 20. On the scraper mounting plate 32, scrapers 33 are respectively attached to the left and right parts excluding the intermediate part.
[0015]
As shown in FIGS. 2, 3, and 5, the scum discharging means 14 configured as described above is integrally formed by projecting the front and rear side surfaces of the housing 15 to the front side of the electrolytic cell 6. It is attached to an attachment piece 35 that is integrally formed upright at the center of the scum discharge port 34 and an attachment plate 36 that is erected at the central portion on the back side of the electrolytic cell 6, and is installed in the central part of the electrolytic cell 6. .
[0016]
Then, the scum A floating on the water surface electrolyzed in the first and second electrolysis chambers 8 and 9 moves together with the ball screw 20 that rotates by receiving the rotational force of the drive motor 17 and the ball nut 21 advances. In conjunction with this, the slide pack 24 is translated in the same direction along the guide rail 23, and each scraper 33 is attached to the slide pack 24 via a slider Z metal fitting 26 and a scraper mounting plate 32. It is discharged from the scum discharge port 34 to the scum receiving tank 37.
[0017]
The timing of discharging the scum is controlled by a timer (not shown), and the advancement of the scraper 33 is stopped when the slide pack 24 contacts the front limit switch 31, and the backward movement contacts the rear limit switch 31. Stop by.
[0018]
As shown in FIG. 9, the electrolytically treated water in the second electrolysis chamber 9 from which the scum A has been removed is a horizontally elongated hole 39 having an opening in the common side plate of the second electrolysis chamber 9 and the water surface adjustment tank 38. It flows into the water surface adjustment tank 38 through.
[0019]
As shown in FIGS. 10 and 11, the fixing plate 40 is integrally formed upright on the bottom plate in the water surface adjustment tank 38 in an upright manner, and both front edges of the fixing plate 40 are formed. The left and right guide plates 41 are integrally formed upright in parallel with an interval, and a water level adjusting plate 42 is formed between the fixed plate 40 and the left and right guide plates 41 in the vertical direction indicated by a solid line arrow from above. It is inserted as slidable. Then, the water level adjustment plate 42 is appropriately moved upward, and the water level adjustment plate 42 is temporarily fixed at a predetermined position by stopping against the fixing plate 40 by the stopper 43, and the electrolytic cell 6 (first electrolytic chamber). 8 and the second electrolysis chamber 9) are adjusted so that the water level of the sewage is suitable for the removal and discharge of the scum A by the scraper 33.
[0020]
Both the fixed plate 40 and the water surface adjustment plate 42 are triangular weirs whose upper sides are formed in a V shape, and this allows the flow rate flowing into the water surface adjustment tank 38 to be easily measured from the outside. It was because it did so.
[0021]
The electrolyzed water flowing into the water surface adjustment tank 38 from the electrolyzer 6 is transferred to the electrolyzed water receiving tank 45 through the pipe 44 from the outflow hole.
[0022]
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, and the pipe 48 is connected to a scum receiving tank 37 so that sewage from the scum receiving tank 37 is obtained. The drains from the electrolysis chambers 8 and 9 are piped so as to return to the sewage pit 1 through the pipe 48.
[0023]
The primary treated water from the electrolyzed water receiving tank 45 is connected to 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 through a pipe 49 and a water supply stop valve 50. To the two dehydration treatment devices 58, and the dehydration treatment device 58 is dehydrated and separated into sludge (dehydrated cake) and water for secondary treatment.
[0024]
As shown in FIGS. 12 and 13, the two dehydration processing devices 58 are divided into two parts in the axial direction and connected so as to be openable and closable by a plurality of opening and closing metal fittings 62, as well as upper and lower openings. A flange 60 is provided at the end of each part, and a flange 61 is provided in each axial direction of the free edge. The entire part is opened via an opening / closing bracket 62 as indicated by an imaginary line in FIG. In addition, the joint portion of the collar portion 61 includes an outer cylindrical body 59 that is fastened and closed by a fixing tool 63 such as a bolt or a nut.
[0025]
At the upper part of the outer cylinder 59, there is an upper closing plate 64 having an inlet 65 for primary treated electrolyzed water at the center, and a fixing tool 66 such as a bolt or nut for the joint between the outer peripheral edge and the part 60. The lower part of the outer cylindrical body is fixed to a lower closing plate 67 having a drain outlet 68 at the center thereof with fixing tools 69 such as bolts and nuts for the joint between the outer peripheral edge part and the collar part 61. .
[0026]
A pedestal 70 having a drain port 71 that is slightly smaller in diameter than the lower block plate 67 and that matches the drain port 68 is fixed on the lower block plate 67, and a drain port 71 is provided at the center on the pedestal 70. The drainage inner cylinder 72 is fixed upright and the bag-like filter cloth body 73 is formed on the outer peripheral portion of the drainage inner cylinder 72. Is provided.
[0027]
The bag-like filter cloth body 73 is a filter cloth body capable of collecting fine particles of 1 micron or more, and has a trunk portion 74 and a long leg-like bag portion 75 branched from the trunk portion 74 into a bifurcated shape. The body portion 74 is attached to the lower surface of the upper closing plate 64 by surrounding the introduction port 65 by the attachment plate 77, and the branch portion is supported by the upper surface portion of the draining inner cylinder 72. As shown by an imaginary line in FIG. 13, the two long-legged bag portions 75 are suspended in a substantially semicircular cross section, and each lower end portion is folded several times into a folded portion 76 to be sealed. It is said that. In addition, a draining reticulated cylinder 78 is provided between the bag-like filter cloth 73 and the outer cylinder 59.
[0028]
The two dehydration processing devices 58 are disposed on a tray 79. The primary treated water that has been press-fitted from the introduction port 65 through the pipes and valves passes through both the long-legged bag portions 75 from the trunk portion 74 of the bag-like filter cloth body 73 as indicated by arrows in FIG. While flowing down, water flows down in the draining inner cylinder 72, and a part enters the draining reticulated cylinder 78. On the other hand, the sludge B contained in the primary treated water is collected in each long-legged bag portion 75 sealed by the folding portion 76.
[0029]
The secondary treated water filtered by the bag-like filter cloth body 73 is collected in the receiving tray 79 from the discharge ports 71 and 68, and the secondary treated water by two units is further stored in the filtered water receiving tank 80 from the common drain port, The filtrate is returned to the sewage pit 1 by the filtered water return pump 81.
[0030]
After the dehydration process is performed in this manner, the three-way rotary valve 54 is switched to stop the press-fitting of the primary treated water, and the compressed air from the compressor 83 is then sent from each inlet 65 to each bag by the operation of the electromagnetic valve 82. The sludge B introduced into the filter cloth body 73 and accumulated in the long leg-like bag portions 75 is compressed by pressure vibration caused by compressed air, and is automatically repeated until it becomes a complete cake state. In this case, the determination of the sludge capacity and limit is determined by the pressure switch and indicator 84 or by management of the operation time by a timer or the like. Thus, the primary treatment of 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 source.
[0031]
When the sludge B in the bag-shaped filter cloth body 73 is in a complete cake state, the operation is stopped and the fixing members 66 and 69 of the upper and lower closing plates 64 and 67 fixing the outer cylinder body 59 are removed. At the same time, the fixing member 63 of the collar portion 61 closing the outer cylindrical body 59 is removed, and the outer cylindrical body 59 is manually opened as indicated by an imaginary line in FIG. The long legged bag portion 75 is taken out, the folding portion 76 is opened, and the dehydrated cake (sludge B) is taken out.
[0032]
【The invention's effect】
Therefore, according to the present invention, since it is a combination device of an electrolytic separation treatment device and a dehydration treatment device, the overall size can be reduced, the equipment cost is low, and the installation space can be reduced.
[0033]
In addition, since the electrolytic separation treatment apparatus has an electrolytic structure using a soluble aluminum electrode, it is easy to decompose sewage in a mixed and emulsified state, and water purification proceeds including sterilization by hydrogen gas. .
[0034]
In addition, since the electrolyzer is equipped with a water surface adjustment tank having a water surface adjusting means, the water level in the electrolyzer is always adjusted and maintained well, and the scum separated and floated on the sewage surface can be surely secured with a scraper. Can be removed and discharged.
[0035]
In addition, in the dehydration processing equipment, no chemicals are required and the sludge is dewatered and separated by pouring primary treated water at a high pressure into the bag-shaped filter cloth that can collect fine particles, and pressure vibration is caused by adding compressed air. Therefore, dewatering efficiency is improved and sludge cake formation is achieved.
[0036]
Moreover, in the dehydration apparatus, the cake sludge can be easily removed from the bag-like filter cloth body because the outer cylinder body 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 partial cross-sectional front view showing the main part of the electrolytic separation apparatus.
FIG. 4 is a partially enlarged cross-sectional view showing an arrangement state of soluble aluminum electrode plates.
FIG. 5 is a partial cross-sectional front view showing an electrolytic chamber portion.
FIG. 6 is a partially omitted front view showing a portion of scum discharge means.
FIG. 7 is a partial cross-sectional side view showing the main part of the scum discharge means.
FIG. 8 is a partially omitted cross-sectional view showing a state where the slider Z metal fitting and other components are attached in the scum discharge means.
FIG. 9 is a side view of an electrolytic cell and a water surface adjustment tank, partially cut away and partially omitted.
FIG. 10 is a front view showing an example of water surface adjusting means.
11 is a longitudinal sectional view of FIG. 10 partially omitted.
FIG. 12 is a partly omitted longitudinal sectional view showing an example of a dehydrating apparatus.
13 is a cross-sectional view of FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Sewage pit 5 Electrolytic 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 surface adjustment tank 39 Horizontal long hole 42 Water surface adjustment plate 45 Electrolyzed water receiving tank 58 Dehydration processing device 59 Outer cylinder 73 Bag-shaped filter cloth body A Scum B Sludge

Claims (2)

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,
The primary treatment water introduced under pressure from the electrolytic separation treatment device comprises a dehydration treatment device that is dehydrated and separated into sludge and water and subjected to secondary treatment,
The electrolytic separation treatment apparatus has an introduction port through which sewage from a sewage pit flows at the lower part, and an electrolytic cell in which a plurality of soluble aluminum electrode plates are arranged in parallel with intervals therebetween, A scum discharge means including a scraper attached to the electrolytic cell and removing floating scum on the water surface electrolyzed in the electrolytic cell through a scum discharge port; and a scum attached to the electrolytic cell, Including a water surface adjustment tank equipped with a water surface adjustment plate for adjusting the water surface in the electrolytic cell so as to be surely removed and discharged, and an electrolyzed water receiving tank for receiving primary treated electrolyzed water from the water surface adjustment tank,
The dewatering apparatus includes an outer cylinder that is divided into two in the axial direction and connected so as to be openable and closable, and a bag-like filter cloth body that is suspended in the outer cylinder. . The electrolytic cell in the electrolytic separation processing apparatus is partitioned into a first electrolytic chamber and a second electrolytic chamber, and a plurality of soluble aluminum electrode plates are disposed in the respective electrolytic chambers. 2. The sewage treatment apparatus according to claim 1, wherein two apparatuses are arranged in parallel.

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