JP2014094351A - Effluent treatment apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an effluent treatment apparatus capable of inhibiting the size of a solidified matter generated as a result of a reaction with a chemical at a level suitable for mechanical processing.SOLUTION: For the purpose of forming as small a polymer mass as possible on an occasion for pouring a coagulant 208 into an exfoliation effluent 202, not only is the coagulant 208 dropped as droplets but the exfoliation effluent 202 is also rotated and agitated with an agitation bar so as to generate a rotating water flow. Not only is a polymer mass small enough to be suitable for mechanical processing formed as a result of this treatment but the waste of the coagulant 208 is also avoided. For the purpose of smoothly filtering the exfoliation effluent 202 in which the polymer mass has been coagulated, furthermore, a belt conveyer for conveying a non-woven fabric 225 provided as a filter is obliquely configured, whereas a filter fabric enclosure 221 for horizontally configuring the non-woven fabric 225 is configured on the belt conveyer. The non-woven fabric 225, furthermore, is fixed by a first compression roller 222. The exfoliation effluent 202 is assuredly filtered based on this constitution.

Description

  The present invention mainly relates to a waste liquid treatment apparatus for purifying a polymer wax peeling waste liquid to such an extent that it can be discharged into a river.

In many cases, a polymer wax is applied to the floor of a building as a flooring agent for the purpose of protection or aesthetics. This polymer wax is worn by dust or mechanical scratches or wear, and its function and aesthetics are deteriorated. Therefore, the polymer wax is usually repainted regularly. In order to repaint the polymer wax, it is necessary to peel off the already applied polymer wax from the floor as a pretreatment for repainting.
By performing the above-described periodic repainting, a large amount of polymer wax stripping waste liquid (hereinafter, the polymer wax stripping waste liquid is simply referred to as “stripping waste liquid”) is generated.

As will be described later, the stripping waste liquid is strongly alkaline and contains a large amount of an organic compound called polymer wax. For this reason, it cannot be drained into sewers as well as rivers. This is because the pH balance of the sewage is destroyed by a large amount of alkaline liquid, which adversely affects the sludge decomposition treatment by bacteria.
However, the components of the stripping waste liquid are substantially constant. Therefore, it is much cheaper than sewage treatment facilities to remove organic compounds such as impurities and polymers from a large amount of exfoliated waste liquid by following routine procedures such as adding a predetermined chemical, stirring, and filtering. Thus, it can be purified to such a degree that it can be discharged into a river.
The inventors have sought a technology for treating the stripping waste liquid in a form that is friendly to the natural environment through the business of building maintenance, and have applied for a patent for the technical content. Patent document 1 is one of them.

JP 2010-194493 A

As a result of the inventor's ingenuity over the years, a certain directionality could be determined for the treatment method of the stripping waste liquid. However, even if a treatment method for the stripping waste liquid is established, it is inefficient to manually perform a plurality of treatment procedures included in the treatment method. In particular, for example, about 1000 liters of stripping waste liquid is generated per 3000 m ² of floor area. Therefore, it is necessary to automate (mechanize) the processing procedure of the stripping waste liquid. This automation is necessary in order to maintain the processing quality of the stripping waste liquid at a certain level or more and to receive certification from the local government as a supplier for processing the stripping waste liquid.

In the first step of the stripping waste liquid, a coagulant acid is added to the strong alkaline stripping waste liquid to solidify the polymer wax dissolved in the stripping waste liquid to form a polymer mass, which is filtered.
While the inventors are exploring automation of a method for treating a stripping waste liquid, there is a phenomenon that this polymer mass rapidly solidifies as a phenomenon that hinders automation. When the flocculant is added to the stripping waste liquid, the stripping waste liquid and the flocculant react instantaneously, and the surface of the flocculant is covered with the polymer mass. Then, the flocculant is trapped in the shell made of the polymer lump, and the reaction does not proceed any more. In addition, the size of the polymer mass becomes too large, which is not suitable for filtration.

  In addition, the inventors have confirmed a phenomenon in which polymer lumps are bonded to each other and the polymer lumps become large due to a decrease in the stirring flow rate. In order to avoid this, automation was enabled by stirring at an appropriate flow rate or higher according to the amount of flocculant charged.

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide a waste liquid treatment apparatus that suppresses the solidified product generated by the reaction with the flocculant to a size suitable for mechanical processing.

In order to solve the above-mentioned problem, the waste liquid treatment apparatus of the present invention comprises a coagulation tank into which the waste liquid to be treated is charged, a first stirring bar for stirring the waste liquid to be treated that is charged into the coagulation tank, and a first stirring bar. Measures the pH of the waste liquid to be treated, which is rotationally driven, the first transfer valve that is provided at the bottom of the coagulation tank and controls the discharge of the waste liquid to be treated stored in the coagulation tank, and the waste liquid to be treated that is put into the coagulation tank And a waste liquid PH meter.
The control unit is connected to the waste liquid agitating motor, the first transfer valve, and the waste liquid PH meter, and monitors the measured value of the waste liquid PH meter while driving the waste liquid agitating motor, and the pH of the waste liquid to be processed reaches a predetermined value. If this is detected, the waste liquid to be treated is discharged by controlling the first transfer valve.

According to the present invention, it is possible to provide a waste liquid treatment apparatus that suppresses a solidified product generated by a reaction with a flocculant to a size suitable for mechanical treatment.
Problems, configurations, and effects other than those described above will be clarified by the following description of embodiments.

It is a perspective view of the peeling waste liquid processing apparatus in connection with embodiment of this invention. It is a block diagram which shows the structure of a peeling waste liquid processing apparatus. It is a functional block diagram centering on the control part of a peeling waste liquid processing apparatus. It is the perspective view which shows the outline of a coagulation tank, and the schematic diagram explaining the polymer lump aggregation process in a coagulation tank. It is a perspective view of a filter cloth conveyor. It is the figure which looked at the filter cloth conveyor from the side, and is a schematic diagram explaining the relationship between angles.

From this, the peeling waste liquid processing apparatus which is one Embodiment of the waste liquid processing apparatus which concerns on this invention is demonstrated. However, the treatment of the stripping waste liquid developed by the inventors has three stages of primary treatment, secondary treatment, and tertiary treatment.
In the primary treatment, a polymer lump formed by adding a flocculant (first agent) to the stripping waste liquid is filtered, and further, alkali is added to the spilled waste liquid to neutralize to obtain primary treated water. At this point, BOD (Biochemical Oxygen Demand) decreases from about 50300 mg / L to about 36000 mg / L, for example.
In the secondary treatment, an adsorbent is added to the primary treated water, followed by vacuum drying and further distillation to obtain secondary treated water. At this point, the BOD falls, for example, from about 36000 mg / L to about 2900 mg / L.
In the tertiary treatment, the secondary treated water is put into a water tank containing aerobic bacteria to obtain tertiary treated water. At this point, the BOD drops from about 2900 mg / L, for example, to about 5 mg / L that can be released into the river.
In the present embodiment, an apparatus that performs the primary processing will be described. Originally, it should be called a primary processing apparatus, but in the present embodiment, in order to describe only this primary processing, this primary processing apparatus is called a peeling waste liquid processing apparatus for convenience.

[Configuration and operation flow of stripping waste liquid treatment equipment]
FIG. 1 is a perspective view of a stripping waste liquid treatment apparatus 101 according to an embodiment of the present invention.
FIG. 2 is a block diagram showing the configuration of the stripping waste liquid treatment apparatus 101.
On the gantry 102, a coagulation tank 103, a filter cloth conveyor 104, and a neutralization tank 105 are vertically arranged in order from the top.
The agglomeration tank 103 is responsible for the first step of the separation waste liquid treatment step performed by the separation waste liquid treatment apparatus 101.
The filter cloth conveyor 104 is responsible for the second and third steps of the stripping waste liquid treatment step.
The neutralization tank 105 is responsible for the fourth step of the peeling waste liquid treatment step.

<< First Step: Polymer Agglomeration Treatment by Agglomeration Tank 103 >>
The stripping waste liquid 202 stored in the drum 201 is put into the coagulation tank 103 by the waste liquid feeding pump 203. The agglomeration tank 103 will be described with reference to FIG.
FIG. 4A is a perspective view showing an outline of the aggregation tank 103. The agglomeration tank 103 is a cylindrical stainless steel or chemical-resistant container having an opening directly above, and a bottom 103a is formed in a tapered shape. Furthermore, a first transfer valve 204 is provided in a portion located at the tapered tip in the center of the bottom 103 a of the aggregation tank 103.
A first stirring rod 205 that is rotationally driven by a waste liquid stirring motor 106 fixed to the gantry 102 is inserted in the center of the aggregation tank 103 near the bottom 103a.

Further, the coagulant 208 is supplied from the first chemical solution tank 206 to the coagulation tank 103 by the coagulant supply pump 207 (first drug input pump).
The coagulation tank 103 is provided with a waste liquid PH meter 209 for measuring the pH of the peeling waste liquid 202 filled therein.
The drum 201 is equipped with a first liquid meter 210 together with a waste liquid charging pump 203.
The first chemical tank 206 is provided with a second liquid meter 211.

  The operation of the waste liquid charging pump 203 is controlled by a control unit 301 described later with reference to FIG. A control unit 301 composed of a known microcomputer controls the driving of the waste liquid charging pump 203 with the first transfer valve 204 closed in advance. Then, the liquid level of the stripping waste liquid 202 in the drum 201 obtained from the first liquid meter 210 is viewed, the liquid level of the stripping waste liquid 202 put into the agglomeration tank 103 is managed, and flocculation is performed in one process. The liquid amount of the peeling waste liquid 202 put into the tank 103 is kept constant. As an example, about 25 to 30 liters of peeling waste liquid 202 is charged into the aggregation tank 103 as an amount that does not overflow from the aggregation tank 103. Note that a change in the transfer amount of the separation waste liquid 202 may be detected by providing a flow rate sensor in the waste liquid input pump 203.

  After the stripping waste liquid 202 of a predetermined liquid amount is filled in the coagulation tank 103, the waste liquid stirring motor 106 is controlled by the control unit 301, and the stripping waste liquid 202 is rotationally stirred. Then, the flocculant charging pump 207 drops the flocculant 208 from the first chemical liquid tank 206 little by little at a flow rate of, for example, about 1.7 mL / sec onto the peeling waste liquid 202 that is rotationally stirred. Then, a large number of polymer lumps having a diameter of about 2 mm or less are formed in the separation waste liquid 202 in which a high flow rate of about 5 m / sec, for example, is formed by the waste liquid stirring motor 106.

The dropping amount of the flocculant 208 is better as the water droplets of the flocculant 208 to be dropped are smaller.
At this time, the control unit 301 monitors pH measurement value information of the stripping waste liquid 202 output from the waste liquid PH meter 209, and the flocculant 208 is dropped until the pH of the stripping waste liquid 202 reaches about 4 weak acidity. Stirring is continued. The reason for changing the pH from alkaline to weakly acidic is to extract the polymer mass from the stripping waste liquid 202 without leakage.

<< Second step: Polymer lump filtration by filter cloth conveyor 104 >>
When the controller 301 detects from the waste liquid pH meter 209 that the pH has reached a predetermined weak acidity, the controller 301 stops the flocculant charging pump 207 to stop dripping of the flocculant 208 and opens the first transfer valve 204. Then, the peeling waste liquid 202 in the aggregation tank 103 is discharged from the first transfer valve 204. When the discharge is completed, the waste liquid stirring motor 106 is stopped.
As described above and as shown in FIGS. 1 and 2, the filter cloth conveyor 104 is disposed immediately below the aggregation tank 103. This filter cloth conveyor 104 is demonstrated with reference to FIG.5 and FIG.6 (a).

FIG. 5 is a schematic perspective view for explaining a polymer lump filtering process in the filter cloth conveyor 104.
Fig.6 (a) is the figure which looked at the filter cloth conveyor 104 from the side.
The filter cloth conveyor 104 is provided with a filter cloth support enclosure 221, a first compression roller 222, a compression plate 223, and a second compression roller 224 on a well-known belt conveyor 601 inclined at 15 °, for example. Then, a nonwoven fabric 225 is hung on the filter cloth support enclosure 221 of the filter cloth conveyor 104, and the nonwoven fabric 225 is guided to the tip of the filter cloth conveyor 104 through the first compression roller 222, the compression plate 223, and the second compression roller 224. ing.
The filter cloth support enclosure 221 supports the nonwoven fabric 225 together with the first compression roller 222 so that the nonwoven fabric 225 is substantially parallel to the ground.

  The stripping waste liquid 202 in the coagulation tank 103 discharged from the first transfer valve 204 passes through the nonwoven fabric 225 that covers the filter cloth support enclosure 221. The center of the agglomeration tank 103 is disposed substantially at the center of the filter cloth support enclosure 221, and the separation waste liquid 202 is filtered by the nonwoven fabric 225. The nonwoven fabric 225 receives the polymer mass in the stripping waste liquid 202 and filters other liquids. The conveyor belt 108 of the filter cloth conveyor 104 has a mesh-like structure formed of synthetic resin such as nylon, and allows the liquid filtered by the nonwoven fabric 225 to pass through as it is.

<< 3rd process: Polymer lump press treatment by filter cloth conveyor 104 >>
As a result of the filtration in the second step, the polymer lump (hereinafter abbreviated as “polymer lump residue 226”) remaining in the nonwoven fabric 225 is removed from the stripping waste liquid 202 that has changed to weak acid like mud containing water. Contains a large amount. Therefore, the stripping waste liquid 202 is squeezed out from the polymer lump residue 226.

  The nonwoven fabric 225 in which the polymer lump residue 226 is accumulated first passes through the first compression roller 222. The first compression roller 222 is driven to rotate by a first compression roller motor 227 and is pressed against the conveying belt 108 by a first compression roller cylinder 228 with a certain pressure. However, if a strong pressure is applied to the polymer lump residue 226 containing a large amount of the separation waste liquid 202 from the beginning, the polymer lump residue 226 is excessively crushed, and the polymer lump residue 226 protrudes beyond the width of the conveyor belt 108. There is a fear. Therefore, the pressure of the first compression roller cylinder 228 for operating the first compression roller 222 is preferably about 0.1 MPa, for example.

The polymer lump residue 226 whose moisture in the peeling waste liquid 202 is roughly squeezed by the first compression roller 222 has increased hardness. Therefore, a pressure stronger than the pressure of the first compression roller 222 is further applied to squeeze out the separation waste liquid 202 from the polymer lump residue 226.
The nonwoven fabric 225 in which the polymer lump residue 226 is accumulated then passes through the compression plate 223. A compression resin plate 223 is pressed against the conveyor belt 108 by a compression cylinder 229 with a synthetic resin flat plate such as a rectangular nylon whose width substantially matches the width of the conveyor belt 108. Since the compression plate 223 is not a roller, the control unit 301 drives the compression plate 223 when the conveyor motor 230 that drives the conveyance belt 108 is stationary. In addition, the control unit 301 controls the conveyance belt 108 to perform step driving by the width of the compression plate 223 in the short direction. That is, the squeezing operation of the compression plate 223 and the conveying operation of the conveying belt 108 are performed alternately. The pressure of the compression cylinder 229 for operating the compression plate 223 is preferably about 0.4 MPa, for example.

The polymer lump residue 226 in which the moisture of the stripping waste liquid 202 is further squeezed by the compression plate 223 further increases the hardness. Therefore, a pressure stronger than the pressure of the compression plate 223 is further applied to squeeze out the separation waste liquid 202 from the polymer lump residue 226.
The nonwoven fabric 225 in which the polymer lump residue 226 is accumulated finally passes through the second compression roller 224. Similar to the first compression roller 222, the second compression roller 224 is driven to rotate by the second compression roller motor 231 and is pressed against the conveying belt 108 by the second compression roller cylinder 232 with a certain pressure. The pressure of the second compression roller cylinder 232 that operates the second compression roller 224 is preferably about 0.4 MPa, for example.

By performing the pressing process by the first compression roller 222, the compression plate 223, and the second compression roller 224, the water content of the polymer lump residue 226 is reduced from, for example, about 66.0% to about 33.0%. The polymer lump residue 226 reaches this stage, and water (peeling waste liquid 202) is squeezed out until it can be dried by natural drying for about 2 days.
The polymer lump residue 226 thus dried is incinerated with the nonwoven fabric 225 or used as a solid fuel.

<< Fourth Step: Stripping Waste Liquid 202 Treatment Step with Neutralization Tank 105 >>
As a result of filtration in the second step, the separation waste liquid 202 from which the polymer lump residue 226 has been removed by the nonwoven fabric 225 falls as it is into the neutralization tank 105 disposed just below the filter cloth conveyor 104. Further, the peeling waste liquid 202 squeezed from the polymer lump residue 226 in the third step also falls into the neutralization tank 105.
At the time of the first step, the polymer wax that is the largest contaminant in the stripping waste liquid 202 was agglomerated as a polymer mass by the aggregating agent 208. By this treatment, the peeling waste liquid 202 is changed from alkaline to weakly acidic. In this state, the pH of the stripping waste liquid 202 is not appropriate for the tertiary treatment. Therefore, in the fourth step, the pH of the stripping waste liquid 202 is adjusted to neutral.

The neutralization tank 105 is a rectangular stainless steel or chemical resistant container having an opening directly above, and a drain port (not shown) is provided at the bottom. Further, a second transfer valve 241 is provided at the tip of the drainage port of the neutralization tank 105. The tip of the second transfer valve 241 is connected to a secondary treatment apparatus (not shown) through the primary treated water transfer pump 242.
Near the bottom of the neutralization tank 105, a second stirring rod 243 that is rotationally driven by a primary treated water stirring motor 107 fixed to the gantry 102 is provided.
Further, an alkaline neutralizing agent 246 is charged into the neutralizing tank 105 from the second chemical solution tank 244 by a neutralizing agent charging pump 245.
The neutralization tank 105 is provided with a primary treated water PH meter 247 for measuring the pH of the stripping waste liquid 202 filled therein.
The second chemical tank 244 is provided with a third liquid meter 248.
The neutralization tank 105 is provided with a fourth liquid meter 249.

When the third step is completed, the primary treated water stirring motor 107 is controlled by the control unit 301, and the separation waste liquid 202 is rotationally stirred. Then, the neutralizing agent charging pump 245 supplies the neutralizing agent 246 from the second chemical liquid tank 244 to the peeling waste liquid 202 that is rotationally stirred. Then, the pH of the stripping waste liquid 202 gradually goes from weak acidity to neutrality.
At this time, the controller 301 monitors the pH measurement value information of the stripping waste liquid 202 output from the primary treated water PH meter 247, and until the pH of the stripping waste liquid 202 reaches about 7 neutral, The charging and stirring are continued.

When the pH of the stripping waste liquid 202 reaches 7, the control unit 301 stops the neutralizing agent charging pump 245 and stops charging the neutralizing agent 246. Then, the primary treatment water agitation motor 107 is stopped to stop the agitation of the stripping waste liquid 202. And the 2nd transfer valve 241 is opened and the peeling waste liquid 202 is sent out to the apparatus of a secondary process.
The above is the configuration of the stripping waste liquid treatment apparatus 101 of this embodiment and the flow of processing of the stripping waste liquid 202.

[Configuration of Control Unit 301]
FIG. 3 is a block diagram illustrating a configuration of the control unit 301.
The control unit 301 is formed by providing a calculation control unit 302, which is a known microcomputer, with a display unit 303, which is a liquid crystal display, and an operation unit 304, which is an operation panel.
The calculation control unit 302 includes a first fluid meter 210, a second fluid meter 211, a third fluid meter 248, a fourth fluid meter 249, a waste fluid PH meter 209, a primary treated water PH meter 247, and a waste fluid input. Pump 203, flocculant charging pump 207, neutralizing agent charging pump 245, primary treated water transfer pump 242, first transfer valve 204, second transfer valve 241, waste liquid stirring motor 106, primary treated water stirring motor 107, conveyor motor 230 The first compression roller motor 227, the first compression roller cylinder 228, the compression cylinder 229, the second compression roller motor 231, and the second compression roller cylinder 232 are connected through the control bus 305.
The control unit 301 obtains information from the first fluid meter 210, the second fluid meter 211, the third fluid meter 248, the fourth fluid meter 249, the waste fluid PH meter 209, and the primary treated water PH meter 247. , Waste liquid charging pump 203, flocculant charging pump 207, neutralizing agent charging pump 245, primary treated water transfer pump 242, first transfer valve 204, second transfer valve 241, waste liquid stirring motor 106, primary treated water stirring motor 107, The conveyor motor 230, the first compression roller motor 227, the first compression roller cylinder 228, the compression cylinder 229, the second compression roller motor 231 and the second compression roller cylinder 232 are controlled.

The arithmetic control unit 302 has a built-in timer 306, which is used to measure the operating time of the first transfer valve 204, the conveyor motor 230, etc., and execute appropriate time control.
Further, the arithmetic control unit 302 can be controlled from an external personal computer or the like through the LAN 307.

[Treatment of coagulation tank 103]
Prior to inventing the agglomeration tank 103 according to the present embodiment, the inventors filled the stripped waste liquid 202 into a substantially rectangular water tank similar in shape to the neutralization tank 105, charged the flocculant 208 manually, and stirred. Had gone. Since there was no process for controlling the flow rate of the flocculant 208, the polymer mass produced by aggregation was large, and polymer masses having various shapes were produced. This huge polymer mass greatly hindered the mechanization of waste liquid treatment.
The large agglomerate polymer mass must be tilted to remove it from the aquarium. In order to tilt the water tank, one side of the water tank is configured to be rotatable, and a drive mechanism for tilting the water tank is also required. Further, a filter that receives the stripping waste liquid 202 overflowing from the tilted water tank must be disposed at the tip of the water tank. That is, it is necessary to occupy a large floor area necessary when configuring the waste liquid treatment apparatus. In addition, when separating a large polymer lump from the stripping waste liquid 202, an operation such as removing the polymer lump is required, which complicates the structure of the processing equipment. Furthermore, it is necessary to provide a water flow or the like for washing away the polymer lump that has not flowed down just by tilting the water tank, or to scrape off the polymer lump attached to the inner wall of the water tank.
Inventors conducted many experiments by changing some chemicals used for the flocculant 208 in order to reduce the polymer mass. However, considering the cost and post-processing problems, none of them were realistic.

The inventors have discovered a phenomenon in which the polymer mass produced becomes smaller when the flocculant 208 is added to the stripping waste liquid 202 of the water tank when stirring. Furthermore, it has been found that the size of the polymer mass decreases as the speed of the water flow generated during stirring increases. Therefore, a stirring mechanism that mechanically generates a water flow with respect to the peeling waste liquid 202, that is, the waste liquid stirring motor 106, and the first stirring rod 205 that is rotationally driven by the mechanism are installed in the water tank. In order for the first stirring rod 205 to effectively generate a rotating water flow, the water tank was formed in a cylindrical shape with the first stirring rod 205 as the center. Further, in order to discharge the generated polymer mass from directly below the water tank, the bottom 103a of the water tank is formed in a tapered shape and is configured to be opened and closed by the first transfer valve 204.
Thus, the aggregation tank 103 was completed. Since the agglomeration tank 103 has such a configuration, a mechanism for tilting the water tank is not required, and a filter can be disposed directly below the agglomeration tank 103, so that a large floor area is not required. The agglomeration tank 103 greatly contributed to the miniaturization and simplification of the stripping waste liquid treatment apparatus 101.

FIGS. 4A, 4 </ b> B, and 4 </ b> C are a perspective view illustrating an outline of the aggregation tank 103 and a schematic diagram illustrating a polymer lump aggregation process in the aggregation tank 103.
As shown in FIG. 4A, the shape of the agglomeration tank 103 is best a cylindrical shape in terms of generating a rotating water flow. However, substantially the same effect can be expected even in a polygonal cylinder such as a hexagonal column or an octagonal column. Further, the tapered bottom portion 103a may have a polygonal shape like the cylinder.

  FIG. 4B is a schematic view of the aggregation tank 103 viewed from directly above. As the first stirring rod 205 rotates, the stripping waste liquid 202 rotates in the coagulation tank 103 to generate a rotating water flow. In this state, the coagulant 208 is dropped from the first chemical tank 206 by the coagulant charging pump 207. The flocculant 208 is dripped little by little in the form of water droplets from the nozzle 401.

FIG. 4C is a schematic cross-sectional view of the aggregation tank 103 viewed from the side.
The acid that is the flocculant 208 reacts instantaneously when it comes into contact with the stripping waste liquid 202 to aggregate the polymer mass. When the amount of the flocculant is large, the surface of the liquid of the flocculant is covered with the polymer mass. Then, the flocculant is trapped in the shell made of the polymer lump, and the reaction does not proceed any more. Further, the size of the polymer lump becomes too large to pass through the first transfer valve 204 of the aggregation tank 103. For this reason, in order to reduce the size of the polymer mass, the input amount of the flocculant 208 is reduced as much as possible, and the stripping waste liquid 202 is rotationally stirred to generate a strong rotating water flow.
However, the position of the nozzle 401 for dropping the coagulant 208 should not be near the center of the coagulation tank 103. This is because the water flow is weak in the vicinity of the center, and the flocculant 208 may not be sufficiently dispersed.
Further, the position of the nozzle 401 for dropping the flocculant 208 is not so preferable in the vicinity of the peripheral edge of the flocculant tank 103. This is because friction is generated between the peeling waste liquid 202 and the inner wall of the agglomeration tank 103 at the peripheral portion, and the water flow may be weakened by the friction. This phenomenon in which the water flow causes friction with the inner wall greatly depends on the viscosity of the liquid.
As a result of trial and error by the inventors, it was found that the position of the nozzle 401 is preferably in the range of about 1/3 to 2/3 of the radius of the aggregation tank 103 from the center of the aggregation tank 103 toward the outer edge.

  In addition, as a result of trial and error by the inventors, the size of the polymer mass formed in the aggregation tank 103 is a size that can be discharged from the first transfer valve 204, for example, in the configuration of the present apparatus, the diameter may be 5 mm or less. preferable. However, in order to prevent the polymer lump from adhering to the inner wall of the coagulation tank 103, the nozzle 401, and the waste liquid PH meter 209, it is desirable to suppress the diameter to 1.0 mm or less. Note that the optimum size of the polymer mass varies depending on the size (opening diameter) of the first transfer valve 204.

[Processing of filter cloth conveyor 104]
FIG. 5 is a schematic perspective view for explaining a polymer lump filtering process in the filter cloth conveyor 104.
FIGS. 6A and 6B are schematic views illustrating the relationship between the angle when the filter cloth conveyor 104 is viewed from the side and the angle.
A filter such as a nonwoven fabric 225 is used to filter the peeling waste liquid 202 in which the polymer lump is aggregated. The non-woven fabric 225 is kept horizontal by some means, and the peeling waste liquid 202 is poured from above.
However, when the stripping waste liquid 202 has a momentum, the nonwoven fabric 225 may be rounded due to the momentum of the water flow, and may not function as a filter. Therefore, a means for gripping and fixing the four corners of the nonwoven fabric 225 is necessary so as not to lose the momentum of the water flow.

Therefore, the inventors provided a filter cloth support enclosure 221 that tilts the belt conveyor 601 and keeps the nonwoven fabric 225 substantially horizontal with the belt conveyor 601 tilted.
One end of the filter cloth support enclosure 221 is provided with a roll of non-woven fabric 225, and the other end is provided with a first compression roller 222. One end of the nonwoven fabric 225 is fixed by the weight of the roll of the nonwoven fabric 225. The other end of the nonwoven fabric 225 is fixed by applying pressure to the first compression roller 222 with the first compression roller cylinder 228. Thus, even if the peeling waste liquid 202 is ejected vigorously from the first transfer valve 204, the nonwoven fabric 225 does not lose the momentum of the water flow of the peeling waste liquid 202, and the polymer lump residue 226 is provided in the central portion of the filter cloth support enclosure 221. it can.
Further, keeping the filter cloth support enclosure 221 substantially horizontal is to prevent the puddle from flowing down when the puddle of the separation waste liquid 202 is generated at the central portion of the nonwoven fabric 225 hung on the filter cloth support enclosure 221. It is.

Furthermore, in order to smoothly transfer the polymer lump residue 226 to the subsequent squeezing process, the filter cloth support enclosure 221 was formed obliquely, and the belt conveyor 601 was disposed obliquely in accordance with this. By inclining obliquely, the nonwoven fabric 225 is guided to the first compression roller 222 without being caught by the edge of the filter cloth support enclosure 221.
In addition, as shown in FIG.6 (b), the long side of the filter cloth support enclosure 221 is inclined slightly toward the filter cloth conveyor 104 side from the horizontal line L602. This is a result of considering that the long side of the filter cloth support enclosure 221 does not come into contact with the nonwoven fabric 225 in a state before the peeling waste liquid 202 is discharged.

This embodiment can be applied as follows.
(1) In order to facilitate the control of the stripping waste liquid treatment apparatus 101, liquids are used for the flocculant 208 and the neutralizing agent 246, but solids may be used. When solid is used, the flocculant charging pump 207, neutralizing agent charging pump 245, second liquid meter 211, and third liquid meter 248 that can be used as solids are used. The solid is preferably a fine powder.

  (2) The filter cloth conveyor 104 can be used not only for the separation waste liquid treatment apparatus 101 of the present embodiment but also for all processes for separating liquid from solids containing a large amount of liquid such as sludge, vegetable residue, and tea leaves. is there. In the filter cloth conveyor 104 of this embodiment, since the nonwoven fabric 225 receives the solid during the solid pressing process, there is no possibility that the solid will spill out. Furthermore, the residue from which the liquid has been separated can be easily handled, such as incineration, while attached to the nonwoven fabric 225. That is, the filter cloth conveyor 104 of this embodiment is extremely versatile.

In this embodiment, the peeling waste liquid processing apparatus 101 was disclosed.
When the flocculant 208 is introduced into the stripping waste liquid 202, the flocculant 208 is dropped in the form of water droplets in order to form a polymer mass as small as possible, and the stripping waste liquid 202 is rotated and stirred with a stirring rod to generate a rotating water flow. I let you. By this treatment, the polymer mass is formed small enough to be suitable for mechanical treatment, and the coagulant 208 is not wasted.

  Further, in order to smoothly perform filtration on the exfoliated waste liquid 202 in which the polymer lump is aggregated, a belt conveyor 601 that conveys a nonwoven fabric 225 as a filter is disposed obliquely, and a filter cloth support enclosure 221 that is disposed substantially horizontally. Was provided on the belt conveyor 601. Further, the nonwoven fabric 225 was fixed by the first compression roller 222. With this configuration, the stripping waste liquid 202 is reliably filtered.

The embodiment of the present invention has been described above. However, the present invention is not limited to the above-described embodiment, and other modifications may be made without departing from the gist of the present invention described in the claims. Includes application examples.
For example, the above-described exemplary embodiments are detailed and specific descriptions of the configuration of the apparatus and system in order to explain the present invention in an easy-to-understand manner, and are not necessarily limited to those having all the configurations described. .
Each of the above-described configurations, functions, processing units, and the like may be realized by hardware by designing a part or all of them with, for example, an integrated circuit. Further, each of the above-described configurations, functions, and the like may be realized by software for interpreting and executing a program that realizes each function by the processor. Information such as programs, tables, and files for realizing each function is stored in a memory, a hard disk, a volatile or non-volatile storage such as an SSD (Solid State Drive), or a recording medium such as an IC card or an optical disk. be able to.
In addition, the control lines and information lines are those that are considered necessary for the explanation, and not all the control lines and information lines on the product are necessarily shown. Actually, it may be considered that almost all the components are connected to each other.

  DESCRIPTION OF SYMBOLS 101 ... Stripping waste liquid processing apparatus, 102 ... Stand, 103 ... Coagulation tank, 104 ... Filter cloth conveyor, 105 ... Neutralization tank, 106 ... Waste liquid stirring motor, 107 ... Primary processing water stirring motor, 108 ... Conveying belt, 201 ... Drum can 202 ... Stripping waste liquid, 203 ... Waste liquid charging pump, 204 ... First transfer valve, 205 ... First stirring rod, 206 ... First chemical tank, 207 ... Flocculant charging pump, 208 ... Flocculant, 209 ... Waste liquid PH meter , 210... First fluid meter, 211. Second fluid meter, 221... Filter cloth support enclosure, 222... First compression roller, 223. Lump residue, 227 ... first compression roller motor, 228 ... first compression roller cylinder, 229 ... compression cylinder, 230 ... conveyor motor, 231 ... second compression roller motor, 232 ... second Reducing roller cylinder, 241 ... second transfer valve, 242 ... primary treated water transfer pump, 243 ... second stirring rod, 244 ... second chemical liquid tank, 245 ... neutralizing agent charging pump, 246 ... neutralizing agent, 247 ... primary Treated water PH meter, 248 ... third fluid meter, 249 ... fourth fluid meter, 301 ... control unit, 302 ... calculation control unit, 303 ... display unit, 304 ... operation unit, 305 ... control bus, 306 ... Timer, 307 ... LAN, 401 ... Nozzle, 601 ... Belt conveyor

Claims (9)

A coagulation tank into which the waste liquid to be treated is charged;
A first stirring rod that stirs the waste liquid to be treated that is put into the aggregation tank;
A waste liquid stirring motor for rotationally driving the first stirring rod;
A first transfer valve that is provided at the bottom of the coagulation tank and controls the discharge of the waste liquid to be treated stored in the coagulation tank;
A waste liquid PH meter for measuring the pH of the waste liquid to be treated that is put into the coagulation tank;
The waste liquid agitation motor, the first transfer valve, and the waste liquid PH meter are connected, the measured value of the waste liquid PH meter is monitored while the waste liquid agitation motor is driven, and the pH of the waste liquid to be treated reaches a predetermined value. And a controller that controls the first transfer valve to discharge the processing target waste liquid. Furthermore,
A first chemical liquid tank for storing a first chemical charged in the aggregation tank after the treatment target waste liquid is charged;
A first drug charging pump for charging the first drug from the first chemical tank into the aggregation tank;
The control unit drives the first chemical injection pump while driving the waste liquid agitating motor, detects that the pH of the waste liquid to be processed has reached a predetermined value, and inputs the first chemical The waste liquid treatment apparatus according to claim 1, wherein the driving of the waste liquid agitating motor is stopped after the driving of the pump is stopped and discharged from the first transfer valve. The first agent is an aggregating agent that aggregates a desired substance contained in the waste liquid to be treated.
The control unit controls a rotation speed of the waste liquid agitating motor and a charging speed of the first drug by the first drug charging pump so as to form the substance into a lump that can be discharged from the first transfer valve. 2. The waste liquid treatment apparatus according to 2. A belt conveyor;
A stand for inclining and fixing the belt conveyor at a predetermined angle with respect to a horizontal plane;
A compression roller which is provided on the belt conveyor and squeezes together with the filter a residue attached to a filter which is hung on the belt conveyor and filters the waste liquid to be treated;
A waste liquid treatment apparatus comprising a filter cloth support enclosure provided on the belt conveyor and arranged substantially horizontally with the filter fixed by the compression roller. Furthermore,
A neutralization tank disposed on the gantry directly below the filter cloth conveyor and receiving the waste liquid to be treated;
The waste liquid treatment apparatus according to claim 4, wherein a transport belt of the belt conveyor is configured to transmit the waste liquid to be treated. A coagulation tank into which the waste liquid to be treated is charged;
A first stirring rod that stirs the waste liquid to be treated that is put into the aggregation tank;
A waste liquid stirring motor for rotationally driving the first stirring rod;
A first transfer valve that is provided in the aggregation tank and controls discharge of the waste liquid to be treated stored in the aggregation tank;
A gantry for fixing the aggregation tank;
A filter cloth conveyor disposed immediately below the first transfer valve by the gantry;
A compression roller that is provided in the filter cloth conveyor, squeezes together with the filter a residue attached to a filter that filters the waste liquid to be processed that is hung on the filter cloth conveyor and discharged from the first transfer valve;
A waste liquid treatment apparatus comprising: a controller for controlling the waste liquid stirring motor, the first transfer valve, the filter cloth conveyor, and the compression roller. Furthermore,
A neutralization tank that is disposed directly below the filter cloth conveyor by the gantry and receives the waste liquid to be treated;
A second stirring bar for stirring the waste liquid to be treated that is put into the neutralization tank;
A primary treated water stirring motor for rotationally driving the second stirring rod;
A second transfer valve that is provided in the neutralization tank and controls discharge of the waste liquid to be treated stored in the neutralization tank;
The waste liquid treatment apparatus according to claim 6, wherein the control unit controls the primary treated water stirring motor and the second transfer valve. Furthermore,
A filter cloth support enclosure provided on the filter cloth conveyor and over which the filter is applied;
The filter cloth conveyor is inclined at a predetermined angle, and the filter cloth support enclosure is configured to support the filter substantially horizontally and to receive the processing target waste liquid discharged from the first transfer valve by the filter. The waste liquid treatment apparatus according to claim 7.   The waste liquid treatment apparatus according to claim 8, wherein the waste liquid to be treated is a polymer wax peeling waste liquid.

Images