JP2000051864A - Waste water treatment system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a waste water treatment system capable of suppressing the initial cost or running cost required in order to accelerate the flocculation of SS. SOLUTION: This system comprises a disposer 3 grinding garbage and discharging the ground garbage along with tap water supplied from a route separate from a tap water cock 7, a storage tank 10 storing the waste water containing the ground garbage from the disposer 3 to sediment and separate a solid and the electrolytic cell 8 provided in the supply route (tap water piping 5a) of tap water to the disposer 3 to dissolve ions having flocculation accelerating effect in tap water.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wastewater treatment system for treating wastewater containing crushed garbage and the like from a disposer.

[0002]

2. Description of the Related Art In a conventional disposer wastewater treatment system, for example, wastewater containing crushed garbage from the disposer is temporarily stored in a flow control tank, and the precipitate is solid-liquid separated by an air lift or the like together with a liquid component. And then separated into a solid component and a liquid component, and the separated solid component is put into a compost (composting) device and composted by an organic matter decomposition treatment by microorganisms. Further, the liquid component is put into an aeration tank, and organic components are decomposed by microorganisms by aeration treatment. Then, the treated water treated in the aeration tank is allowed to flow naturally to the sedimentation separation tank to precipitate the floc-excess sludge,
The supernatant is discharged to the sewer, and the sludge that has settled is returned to the first-stage flow control tank by an air lift or the like.

In the above-mentioned system, it is necessary to increase the amount of precipitates in the flow control tank to efficiently recover the solids. For this purpose, the SS (floating) contained in the wastewater is required. It is important to promote coagulation of water-soluble pollutants and settle and separate them.

[0004]

Therefore, conventionally, a coagulant has been periodically supplied by providing an automatic drug supply device and the like, and a stirring device for diffusing air has been provided to perform stirring as required. However, this configuration has a problem that the initial cost and the running cost of the system increase because periodic supply of the coagulant to the automatic medicine injection device is required.

[0005] Japanese Patent Application Laid-Open No. 9-108678 (C
02F 1/463), an electrolysis tank (electrolysis tank) is provided in the circulation path of the water purification device that purifies the water in the bathtub, and metal ions are eluted into the circulating water to promote the aggregation of SS in the circulating water. This is disclosed, and it is conceivable to apply this to the above-described system.

However, since the electrolytic bath is provided in a path through which dirty water in the bath circulates, adhesion of organic substances and the like and generation of a passive film on the electrode surface of the electrolytic bath occur.
Since the supply of stable aggregated ions is hindered, frequent maintenance is required, which also increases running costs.

Accordingly, the present invention has been made to solve such a problem, and an object of the present invention is to provide a wastewater treatment system capable of suppressing an initial cost and a running cost required to promote the aggregation of SS. Is what you do.

[0008]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a storage tank for storing wastewater containing solids and sedimenting and separating the solids, and tap water in the wastewater. And an electrolytic tank provided in the tap water supply path to dissolve ions having a coagulation promoting effect in the tap water.

In addition, a disposer for pulverizing garbage and discharging crushed garbage together with tap water supplied through a channel different from a water tap, and storing wastewater containing crushed garbage from the disposer. A storage tank for sedimentation and separation of solids, and an electrolytic tank provided in a supply path of tap water to the disposer for dissolving ions having a coagulation promoting effect in tap water. .

Further, a solid-liquid separating means for separating the precipitate in the storage tank into a solid component and a liquid component, a composting device for composting the solid component separated by the solid-liquid separating device, A water treatment tank for purification, a sedimentation separation tank for sedimenting and separating sludge contained in the treated water treated in the water treatment tank, and a return means for returning the sludge precipitated in the sedimentation separation tank to the storage tank. It is characterized by having.

[0011] Further, a control means for periodically inverting the polarity of the electrode of the electrolytic cell is provided.

Further, the present invention is characterized in that iron or aluminum is used for the electrode of the electrolytic cell.

[0013]

Embodiments of the present invention will be described below in detail with reference to the drawings.

FIG. 1 is a system configuration diagram showing an embodiment of a disposer wastewater treatment system as a wastewater treatment system according to the present invention.

In this disposer wastewater treatment system, wastewater containing pulverized garbage from a disposer 3 provided below a sink 2 of a sink 1 is temporarily transferred to a storage tank 10 having a flow rate adjusting function via a pipe 4. The sediment is stored and transported together with the liquid to the solid-liquid separator 20 by the air lift tube 11 to separate the solid and the liquid. The separated solid is put into the compost (composting) device 30 and the microorganisms are collected. Is composted by organic matter decomposition treatment. The separated liquid is put into a water treatment tank 40, and organic components are decomposed by microorganisms by aeration treatment. Then, the treated water treated in the water treatment tank 40 is allowed to flow naturally into a settling / separation tank 50, which communicates with the upper part, to settle the surplus sludge that has been flocculated. The supernatant is discharged to the sewer and the settled sludge is removed by an air lift. The pipe 51 returns to the first storage tank 10.

The disposer 3 is of a batch type, in which the amount of water used at one time is constant, and the maximum processing amount of garbage is determined by the internal volume of the disposer 3. Further, the water supply pipe 5 of the sink 1 can be switched between the water supply faucet 7 side and the disposer 3 side via a switching valve 6 composed of an electromagnetic valve or the like. An electrolytic tank 8 for dissolving metal ions having a coagulation promoting effect in tap water supplied to the disposer 3 is provided in the middle of the tap water pipe 5a to the disposer 3 side. In addition, a disposer activation switch 9 for operating the disposer when the disposer is used is provided on the upper front side of the sink 1.
Is attached.

An air lift pipe 11 is provided in the storage tank 10.
Is provided with a blower 12 for supplying air to a lower portion of the blower. The storage tank 10 is provided with a water level sensor 13 for detecting a water level in the tank. The water level sensor 13 is capable of continuously detecting a water level in a non-contact manner by ultrasonic waves or infrared rays. Although it is a contact type water level sensor, other water level sensors such as an electrode type water level sensor and a pressure type water level sensor can also be used.

The solid-liquid separation device 20 is of a batch type, and an acceptable amount per operation is determined.

On the other hand, an air diffuser 41 is provided at the bottom of the water treatment tank 40, and a blower 42 for supplying air to the air diffuser 41 is provided. Further, the water treatment tank 40 contains a carrier 43 in which aerobic microorganisms that decompose organic substances inhabit. The water to be treated, which is a liquid component charged into the water treatment tank 40, contains an organic substance component,
The aerobic microorganisms inhabiting the carrier 43 are activated by aeration to decompose the organic components, thereby facilitating sedimentation as surplus sludge in the sedimentation separation tank 50 at the next stage, the upper part of which is connected with the communication pipe 44.

Further, the sedimentation separation tank 50 is provided with a blower 52 for supplying air to a lower part of the air lift pipe 51. In addition, a partition plate 54 for preventing the treated water containing flocs from flowing into the sedimentation separation tank 50 from being discharged from the water treatment tank 40 to the sewage directly from the drain pipe 53 even when the treated water containing the flocs flows from the water treatment tank 40 when the tank is full. Is provided.

In this embodiment, the three blowers 12, 42 and 52 are used as described above, but relatively inexpensive electromagnetic diaphragm pumps are used for these blowers 12, 42 and 52. . This diaphragm pump discharges air by driving a solenoid by an AC power supply to vibrate the diaphragm at the frequency of the AC power supply. The number of blowers can be reduced by switching and controlling the air supplied from one blower to a plurality of uses by using a multi-way valve constituted by an electromagnetic valve or the like.

The blowers 12, 42 and 52 are controlled by a microcomputer (hereinafter abbreviated as "microcomputer") for controlling the entire system.
The blower 42 for aeration is almost always driven, and the blower 12 for transferring the sediment in the storage tank 10 and the blower 52 for returning the sludge in the sedimentation separation tank 50 perform transfer and return of a substantially constant amount in a constant cycle. It is controlled to be performed.

FIG. 2 is a detailed configuration diagram showing a main part of the above embodiment.

In the electrolytic cell 8, two iron electrode plates 8a and 8b are arranged at an appropriate interval, and a direct current from a DC power supply 60 is supplied to these electrode plates 8a and 8b. It is being supplied. This DC power supply 60
The polarity supplied to the electrode plates 8a and 8b is switchable, and the ON / OFF and polarity switching of the DC power supply 60 are performed by a microcomputer 70 as a control means for controlling the entire system.
Is controlled by The microcomputer 70 controls the DC power supply 60 on the basis of the operation output from the above-described disposer start switch 9, and also switches a tap water switching valve 6 including an electromagnetic valve and the like and a rotor (see FIG. (Not shown) is controlled.

The above control is executed by starting a disposer driving routine as shown in the flowchart of FIG. 3 from the main routine of the present system based on the operation output of the disposer start switch 9.

That is, when the disposer drive routine shown in FIG. 3 is started by turning on the disposer start switch 9, first, the number of times of operation of the disposer 3 is integrated (process 101). Then, it is checked whether the number of disposer operations has reached a predetermined value (decision 102).

If the number of times of the disposer operation has not reached the specified value, the DC power supply 60 is not turned over and the DC power supply 60 is turned on, and at the same time, the tap water switching valve 6 is turned on the disposer 3 side (the electrolytic cell 8 side). ) To supply the tap water to the disposer 3 via the electrolytic cell 8 (NO in the judgment 102 → the processing 103 → the processing 104). Further, the disposer driving motor 3a for driving the garbage crusher rotor of the disposer 3 is turned on (process 105).

Tap water is supplied to the electrolytic cell 8 and D
When the C power supply 60 is turned on, a current flows between the electrode plates 8a and 8b in the electrolytic cell 8, and iron ions dissolve in water from the anode side. The iron ions dissolved in the tap water are mixed with the crushed garbage in the disposer 3 together with the tap water, and the crushed garbage is transferred to the storage tank 10 via the pipe 4 together with the tap water. In the storage tank 10, the SS component that is unlikely to settle due to the effect of promoting coagulation of iron ions is flocculated and settles and separates.

When a predetermined period of time elapses from the start of driving the disposer 3, the disposer driving motor 3a is turned off, and the tap water switching valve 6 is returned to the original tap faucet 7 side. Also turn off
The above-described disposer driving routine is ended (decision 1
06 YES → Process 107 → Process 108 → Process 10
9).

When the above-described disposer operation is performed several times and the number of disposer operations counted in the process 101 of the above routine reaches a predetermined value, the polarity of the DC power supply 60 is inverted ( YE of decision 102
S → Process 110), the integration counter is reset (Process 111), and the processes 103 to 109 described above are executed. As a result, it is possible to prevent the electrode plates 8a and 8b from being partially reduced, extend the maintenance interval, and suppress the running cost.

As described above, according to this embodiment, the storage tank 10 can be used without adding a coagulant charging device or a stirring device.
Can promote the agglomeration of the SS, so that the sedimentation and separation performance can be improved and the initial cost and running cost of the system can be suppressed. Further, since the electrolytic tank 8 is provided in the middle of the tap water supply pipe 5a to the disposer 3, the garbage can be crushed and the storage tank 10 can be crushed.
Of the aggregated ions and SS during the transfer to
Aggregation of S is further promoted. Also, the electrode plates 8a, 8b
Adhesion of organic substances and the like to the surface and generation of a passivation film can be prevented, stable supply of aggregated ions can be performed, maintenance intervals can be extended, and running costs can be further suppressed.

Further, the solid-liquid separator 20 as described above,
Compost (composting) device 30, water treatment tank 40, sedimentation separation tank 50, sludge settled in sedimentation separation tank 50, storage tank 1
Return means (air lift pipe 51 and blower 5)
By applying the present invention as described above to a system having 2) and the like, in addition to the effects described above, the sedimentation separation tank 50
The flocculation of SS in the storage tank 10 including the returned sludge from the wastewater can be promoted, and the improvement of the solid content recovery efficiency and the treated water quality can be expected.

In the above embodiment, the electrode plate 8 made of iron is used.
Although a and 8b were used, an electrode plate made of aluminum may be used. By forming the electrode plate from iron or aluminum in this way, metal ions having a high coagulation effect can be generated, and even if dissolved in wastewater, they are not harmful and can be constructed at a low cost.

By the way, in the system configuration of FIG.
The storage tank 10, the water treatment tank 40, the sedimentation separation tank 50, and the compost device 30 are arranged in a horizontal line, and the solid-liquid separation device 20 is arranged above the water treatment tank 40.
As shown in the figure, the storage tank 10, the water treatment tank 40, and the sedimentation separation tank 50 are arranged adjacent to each other, and the composting device 30 is arranged adjacent to the water treatment tank 40, and It is preferable to arrange the solid-liquid separation device 20 at the bottom.

By doing so, the pipes (the air lift pipes 11, 51 and the communication pipe 44) for sending the sediment, the water to be treated and the like can be configured to be the shortest. The cost can be reduced, and various troubles can be suppressed by shortening the piping in which clogging or the like is likely to occur. In addition, since the installation location is close to a square, the stability at the time of installation is improved. In addition, since no special means is required for transporting the solid component and the liquid component separated by the solid-liquid separation device 20 to the compost device 30 and the water treatment tank 40, the cost can be reduced as described above. At the same time, various troubles can be suppressed.

The present invention is not limited to the disposer wastewater treatment system having the structure as shown in FIGS. 1 and 4. For example, the liquid separated by the solid-liquid separator is returned to the storage tank. It can be applied to the one in which the supernatant liquid is put into the water treatment tank by air lift or the like, or the one in which the water treatment tank and the sedimentation separation tank are formed by dividing the inside of one treatment tank with partition walls. It is. Further, for example, the present invention can be applied to an industrial wastewater treatment system for treating wastewater containing crushed garbage generated during production of tofu or soy sauce, or a wastewater treatment system for treating toilet wastewater. .

[0037]

As described above, according to the present invention, a storage tank for storing wastewater containing solids and settling and separating the solids, a tap water supply means for supplying tap water into the wastewater,
By providing an electrolytic tank provided in the supply path of the tap water and dissolving ions having a coagulation promoting effect in the tap water, not only the disposer but also a waste water containing solids such as crushed garbage is treated. Even when applied to other wastewater treatment systems, it is possible to promote the flocculation of SS in the storage tank without adding a coagulant charging device or stirring device, and to improve the sedimentation separation efficiency. The initial cost and running cost of the system can be reduced. In addition, since an electrolytic cell is provided in the tap water supply path, it is possible to prevent the adhesion of organic substances and the like to the electrode surface and to prevent the formation of a passivation film. It can be extended, and the running cost can be further suppressed.

Further, a disposer for crushing garbage and discharging garbage with tap water supplied through a channel different from a water tap, and storing wastewater containing crushed garbage from the disposer. Storage tank for sedimenting and separating solids, and an electrolytic tank provided in the supply path of tap water to the disposer for dissolving ions having a coagulation promoting effect in the tap water, so that a coagulant input device and Aggregation of SS in the storage tank can be promoted without adding a stirrer, and sedimentation and separation performance can be improved, so that the initial cost and running cost of the system can be suppressed. In addition, since an electrolytic cell is provided in the supply path of tap water to the disposer, mixing of agglomerated ions and SS is performed during crushing of garbage and transfer to the storage tank,
Aggregation of SS is further promoted. Furthermore, since the adhesion of organic substances and the like to the electrode surface and the generation of a passive film can be prevented,
A stable supply of the aggregated ions can be achieved, the maintenance interval can be extended, and the running cost can be further suppressed.

Further, a solid-liquid separating means for separating the sediment in the storage tank into a solid component and a liquid component, a composting device for composting the solid component separated by the solid-liquid separating device, A water treatment tank for purification, a sedimentation separation tank for sedimenting and separating sludge contained in the treated water treated in the water treatment tank, and a return means for returning the sludge precipitated in the sedimentation separation tank to the storage tank. By applying the present invention to a system having, in addition to the above effects, it is possible to promote the flocculation of SS in the storage tank including returned sludge from the precipitation separation tank,
Improvements in solids recovery efficiency and treated water quality can be expected.

Further, by providing a control means for periodically inverting the polarity of the electrode in the electrolytic cell, it is possible to prevent the electrode from being worn out, to further extend the interval of maintenance and inspection, and to further increase the running cost. Suppression can be achieved.

By using iron or aluminum for the electrode of the electrolytic cell, metal ions having a high coagulation effect can be generated. Can be configured.

[Brief description of the drawings]

FIG. 1 is a system configuration diagram showing an embodiment of a disposer wastewater treatment system as a wastewater treatment system according to the present invention.

FIG. 2 is a detailed configuration diagram showing a main part of the embodiment.

FIG. 3 is a flowchart showing a main part of the operation of the embodiment.

FIG. 4 is a schematic configuration diagram showing an example of the arrangement of each component of the disposer wastewater treatment system, where (a) is a top view, (b) is a side view, and (c) is a front view.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Sink 2 Sink 3 Disposer 3a Disposer drive motor 4 Piping 5, 5a Water piping 6 Switching valve 7 Water faucet 8 Electrolyzer 8a, 8b Electrode plate 9 Disposer start switch 10 Storage tank 11, 51 Air lift pipe 12, 42, 52 Blower 13 Water level sensor 20 Solid-liquid separation device 30 Compost (composting) device 40 Water treatment tank 41 Aeration tube 43 Carrier 44 Communication tube 50 Precipitation separation tank 53 Drainage pipe 60 DC power supply 70 Microcomputer (control means)

Continued on the front page (72) Inventor Keiichi Fujimoto 2-5-5 Keihanhondori, Moriguchi-shi, Osaka Sanyo Electric Co., Ltd. (72) Inventor Jun Yoshida 2-5-2-5 Keihanhondori, Moriguchi-shi, Osaka Sanyo Electric Co., Ltd. (72) Inventor Norimasa Sakamoto 2-5-5 Keihanhondori, Moriguchi-shi, Osaka F-term in Sanyo Electric Co., Ltd. (reference) 4D061 AA08 AB09 BA02 BB01 BB04 BB05 BB27 BB28 CA14 CA15 4D062 BA04 BA19 CA04 DA02 DA12 FA01 FA12 FA15 FA26

Claims (5)

[Claims] 1. A storage tank for storing wastewater containing a solid content and sedimenting and separating the solid content, a tap water supply means for supplying tap water into the waste water, and a water supply path provided in the supply path of the tap water. A wastewater treatment system comprising: an electrolytic cell that dissolves ions having a coagulation promoting effect in tap water. 2. A disposer for crushing garbage and discharging garbage with tap water supplied through a channel different from a water tap, and storing wastewater containing crushed garbage from the disposer. A wastewater treatment system, comprising: a storage tank that sediments and separates a solid component, and an electrolytic tank that is provided in a supply path of tap water to the disposer and dissolves ions having a coagulation promoting effect in tap water. . 3. A solid-liquid separating means for separating the precipitate in the storage tank into a solid component and a liquid component, a composting device for composting the solid component separated by the solid-liquid separating device, A water treatment tank for purification, a sedimentation separation tank for sedimenting and separating sludge contained in the treated water treated in the water treatment tank, and a return means for returning the sludge precipitated in the sedimentation separation tank to the storage tank. The wastewater treatment system according to claim 1, wherein the wastewater treatment system has: 4. The wastewater treatment system according to claim 1, further comprising control means for periodically inverting the polarity of the electrode of the electrolytic cell. 5. The wastewater treatment system according to claim 1, wherein iron or aluminum is used for an electrode of the electrolytic cell.