JPH11216483A - Sewage regeneration apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sewage regeneration apparatus which treats sewage and allows the recycling of the purified water obtd. by the treatment in specific applications. SOLUTION: The sewage discharged from a washing tank 3 of a washing machine 1 flows into the treating vessel 2 of the sewage regeneration apparatus D1 . Activated sludge is put into the treating vessel 2 which is provided with a filter membrane device 4. The suction header 7 to the filter membrane device 4 is connected to a suction pump 8 via a suction pipe 9. Electrodes 14, 15 consisting of iron are hung and arranged at the treating vessel 2. The electrodes 14, 15 are immersed into the sewage in the treating vessel 2 and elute the iron ions for removing the phosphoric acid in the sewage by electrolysis. A tank 12 stores the purified water sucked by the suction pump 8. A supply pump 18 which pumps up the purified water in the tank 12 and supplies the water to the washing tank 3 is disposed at the bottom of the tank 12.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sewage regenerating apparatus, and more particularly to a method for treating sewage such as domestic wastewater and human wastewater, and reusing purified water obtained by the treatment for a specific use. The present invention relates to a configured sewage recycling apparatus.

[0002]

2. Description of the Related Art Conventionally, domestic wastewater discharged from a washing machine, a disposer, or the like has not been reused because it is directly guided to a sewer pipe and discarded.

[0003] In the case of a washing machine, the remaining water in the bath may be used as washing water, but such reuse of water is affected by the amount of the remaining water and the frequency of bathing. It is not an effective method.

[0004] In addition to the human wastewater being guided to a sewer pipe, it is not reused because it is treated by a septic tank and discarded to a drainage passage.

[0005]

SUMMARY OF THE INVENTION The present invention has been made in consideration of such circumstances, and treats sewage such as domestic wastewater and human wastewater, and specifies purified water obtained by the treatment. It is an object of the present invention to provide a sewage recycling apparatus configured to be reusable for various uses.

[0006]

According to the present invention, there is provided a treatment tank for subjecting wastewater to activated sludge treatment, and a treatment tank provided in the treatment tank for solid-liquid separation of the activated sludge mixture in the tank by filtration. There is provided a sewage recycling apparatus comprising a filtration membrane device and a tank connected to the filtration membrane device and storing purified water as a filtrate for reuse.

[0007] The treatment tank biologically treats sewage (water to be treated) introduced from a sewage introduction pipe or the like under aerobic conditions using activated sludge put in the tank.

The filtration membrane device separates the activated sludge mixed liquid (mixed liquid of activated sludge and water to be treated) in the tank into solid and liquid by filtration into activated sludge and a filtrate (purified water). As the filtration membrane device, for example, a device in which one filtration membrane body is arranged inside a box-shaped casing that opens vertically or a plurality of filtration membrane plates are arranged in parallel is used.

[0009] Such a filtration membrane device is detachably or fixedly provided inside the processing tank. When the filtration membrane device is detachably provided, maintenance, inspection and cleaning thereof are facilitated. More preferably, the filtration membrane or the filtration membrane plate is provided at a position where it comes into contact with aeration air supplied by an aeration tube connected to an air supply means outside the tank. This is because the film surface can be washed with the air for aeration.

The tank is disposed, for example, on the side or above the treatment tank, and stores purified water sucked by a suction pump. And a certain amount of purified water in the stored tank is
As needed, it is used for predetermined equipment and facilities (for example, a washing machine or a water supply for a flush toilet).

The sewage recycling apparatus according to the present invention further comprises at least one set of electrodes for eluting iron or aluminum ions by electrolysis for removing phosphoric acid in the sewage in the treatment tank, and the electrodes for electrolysis. Preferably, a power supply for supplying a current is provided. This is because, in addition to the effect of the sewage filtration by the above-mentioned filtration membrane device, an effect that effective removal of phosphoric acid in sewage that cannot be removed by filtration can be ensured.

The sewage regenerating apparatus according to the present invention further includes a suction pump connected to the filtration membrane device for sucking purified water into the tank, and a supply pump for supplying purified water in the tank when reused. Preferably, the treatment tank and the tank are provided with water level sensors for detecting the respective water levels.

The suction pump is for sucking purified water as a filtrate by the filtration membrane device and guiding the purified water to the outside of the treatment tank.
For example, it is arranged above the outside of the processing tank. The suction pump is connected through a suction pipe to an upper portion of the casing where the filtrate from the filtration membrane device is collected.

The supply pump is for pumping purified water in the stored tank and supplying the purified water to the above-mentioned devices and equipment, and is arranged, for example, inside the tank. The feed pump may be connected in advance with a water pipe for introducing purified water to the above-mentioned equipment or equipment, or may be provided with a connection portion for connecting such a water pipe.

[0015] Purified water can be used efficiently based on the water levels of the treatment tank and the tank detected by the water level sensor.

It is preferable that the sewage regenerating apparatus according to the present invention further includes a control unit that controls the suction pump and the supply pump based on the detection result of the water level sensor.
According to the sewage recycling apparatus configured as described above, efficient use of the purified water can be performed by automatic control by the control unit.

In the sewage recycling apparatus according to the present invention, it is preferable that the tank is configured to be connectable to, for example, a washing tub of a washing machine or a water supply of a flush toilet. This is because the purified water is effectively used for a washing machine or a flush toilet.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Two embodiments of the present invention will be described below with reference to the drawings. The present invention is not limited by these.

Embodiment 1 As shown in FIG. 1, a sewage regenerating apparatus D _{1 according} to Embodiment 1 of the present invention includes a treatment tank 2 installed in a lower portion of a washing machine 1.
Is provided. Wastewater (dirty water) discharged from the washing tub 3 of the washing machine 1 flows into the treatment tub 2 through the drain valve 3a.

Activated sludge is put in the treatment tank 2 in advance. The activated sludge mixes with the incoming sewage to form an activated sludge mixture. At the center inside the processing tank 2,
The filtration membrane device 4 is provided so as to be immersed in the water to be treated.

The filtration membrane device 4 includes a box-shaped casing 5 which is opened vertically, and a plurality of filtration membrane plates 6 which are detachably suspended in parallel above and inside the casing 5.
And a suction header 7 attached to the upper end of these filtration membrane plates 6. Suction header 7 of filtration membrane device 4
Is a suction pump 8 attached to the upper outside of the processing tank 2.
Through a suction pipe 9.

Each filtration membrane plate 6 separates the activated sludge mixture in the treatment tank 2 into an activated sludge and a filtrate by a filter medium attached to the surface. The filtrate that has passed through the filter medium collects on the suction header 7 and is sucked by the suction pump 8 via the suction pipe 9.

An aeration tube 11 is disposed horizontally below the casing 5 of the filtration membrane device 4. The aeration pipe 11 is connected to an aeration blower 10 arranged outside the processing tank 2, and supplies the aeration air into the casing 5 by the operation of the blower 10. This air for aeration is supplied to the casing 5.
The activated sludge mixed liquid inside the filter is aerated and the membrane surface is washed by touching each filtration membrane plate 6.

In the processing tank 2, a pair of electrodes 14 and 15 is suspended between two adjacent casings 5. These electrodes 14 and 15 are made of iron in the shape of a rectangular plate, and are immersed in sewage in the treatment tank 2,
Iron ions for removing phosphoric acid in wastewater are eluted by electrolysis.

A constant current for electrolysis is supplied from a power supply 16 to these electrodes 14 and 15. Here, the electrodes 14.1
The polarity of 5 is switched once every hour. Due to the electrolysis, iron ions are eluted from the electrodes 14 and 15 and cause an agglutination reaction with the phosphorus component (phosphate ion) in the wastewater in the treatment tank 2. The compound generated at this time is treated tank 2
Settles at the bottom. This precipitate is sucked out during maintenance.

The filter medium constituting the filtration membrane plate 6 is used for separating generated compounds and SS components from treated water (purified water), and has a pore diameter of 1 μm or less. .

The suction pump 8 is driven by a motor (not shown). Further, the suction pump 8 is connected to a tank 12 disposed above the suction pump 8 via a suction pipe 13. The tank 12 is a container having a ring shape in plan view, which is disposed using an empty space around the washing tub 3 of the washing machine 1, and stores purified water sucked by the suction pump 8.

Sewage discharged from the washing tub 3 and the tank 12
Table 2 shows the results of the water quality test with the purified water stored in the table. The unit of each numerical value is mg / liter. In this table, “drain” means sewage discharged from the washing tub 3, and “treated water” means purified water stored in the tank 12. "TN" is total nitrogen, "T-N"
"-P" represents total phosphorus.

At the bottom of the tank 12, a supply pump 18 is provided. The supply pump 18 is for pumping up purified water in the tank 12 and supplying it to the washing tub 3 at the time of reuse. A water guide pipe 19 for introducing purified water into the washing tub 3 is connected to the supply pump 18.

The treatment tank 2 is provided with a water level sensor 20 for detecting the lower limit water level. The tank 12 is provided with a water level sensor A21 for detecting an intermediate water level and a water level sensor B22 for detecting an upper limit water level.

The amount of sewage discharged in one washing operation varies depending on the type of washing machine and the amount of laundry. If the amount of sewage is, for example, 100 liters, the amount of sewage will be reduced in the washing machine 1 as shown in FIG. If so, the capacity of the processing tank 2 will be about 30 liters.

Even if the treatment tank 2 is full of sewage, it is sent to the discharge side. From processing tank 2 to tank 12
The amount of purified water sent to the furnace is 0.5 to 1.0 liter / minute.

The water level sensor 20 in the processing tank 2 detects the lower limit water level in the processing tank 2 because the filtration membrane plate 6 and the electrodes 14 and 15 of the processing tank 2 need to be constantly immersed in sewage. That is, suction is performed by the suction pump 8 only when the water level in the treatment tank 2 is above the water level sensor 20, and when the water level falls below the water level sensor 20, the suction of the suction pump 8 stops.

When the water level in the tank 12 is higher than the water level sensor A21 and lower than the water level sensor B22, the supply pump 18 (pump in the tank) operates. Then, washing is performed by the purified water in the tank 12. When the water level in the tank 12 is lower than the water level sensor A21, the supply pump 18 is stopped, and washing is performed with tap water. The water level of the tank 12 is the water level sensor B2
When it is higher than 2, the operation of the washing machine 1 is stopped.

It should be noted that the filter membrane plate 6 needs to be periodically cleaned because the more frequently the filter is used, the more the clogging occurs and the performance deteriorates. The washing may be performed by a method of periodically flowing back the purified water or a method of dipping the filtration membrane plate 6 in an acid such as citric acid. In the case of the washing machine 1, the purified water may be caused to flow back about once a day.

The operations of the suction pump 8 and the supply pump 18 as described above, the cleaning of the filtration membrane plate 6, and the electrolysis are controlled by a control unit (not shown). Details of the control are shown in the flowchart of FIG.

Second Embodiment As shown in FIG. 4, a sewage regenerating apparatus D _{1 according to a} second embodiment of the present invention includes a treatment tank 5 connected to a side of a washing machine 51.
2 is provided. Wastewater (dirty water) discharged from the washing tub 53 of the washing machine 51 flows into the treatment tank 52 through the drain valve 53a.

Activated sludge is put in the treatment tank 52 in advance. The filtration membrane device 4 is provided in the center of the inside of the treatment tank 52 so as to be immersed in the water to be treated.

The filtration membrane device 4 is substantially the same as that of the first embodiment. The filtration membrane device 4 is connected to a suction pump 58 via a suction pipe 59.

The aeration pipe 11 is connected to an aeration blower 10 disposed outside the processing tank 2, and supplies aeration air by operating the blower 10.

The electrodes 14 and 15 are suspended from the processing tank 52. These electrodes 14 and 15 are substantially the same as those of the first embodiment. These electrodes 14.1
5 is supplied with a constant current for electrolysis by a power supply 16.

The suction pump 58 is connected to a tank 60 arranged on the side of the suction pump 58 via a pumping pipe 61. Tank 6
Numeral 0 is a rectangular parallelepiped container arranged on the side of the washing machine 51, and stores purified water sucked by the suction pump 58.

At the bottom of the tank 60, a supply pump 62 is provided. The supply pump 62 is for pumping the purified water in the tank 60 and supplying the purified water to the washing tub 53 at the time of reuse. The supply pump 62 supplies purified water to the washing tub 5.
3 is connected to a water guide pipe 63.

The treatment tank 52 is provided with a water level sensor 20 for detecting the lower limit water level. In the tank 60,
A water level sensor A21 for detecting an intermediate water level and a water level sensor B22 for detecting an upper limit water level are provided. These three water level sensors 20, 21 and 22 are used in the first embodiment.
Is substantially the same as

[0045]

According to the first aspect of the present invention, there is provided a treatment tank for performing an activated sludge treatment on sewage, and a filtration provided in the treatment tank for separating the activated sludge mixed liquid in the tank into solid and liquid by filtration. Since it is provided with a membrane device and a tank connected to the filtration membrane device and storing purified water as a filtrate for reuse, wastewater such as domestic wastewater or human wastewater is treated, and The obtained purified water can be reused for a specific use.

According to the second aspect of the present invention, there is further provided at least one set of electrodes for eluting iron ions or aluminum ions by electrolysis for removing phosphoric acid in wastewater in the treatment tank, and the electrodes for electrolysis. Since a power source for supplying a constant current is provided, in addition to the above-mentioned effects of the invention of claim 1, it is possible to effectively remove phosphoric acid in sewage that cannot be removed by sewage filtration using a filtration membrane device. The effect can be secured.

According to the third aspect of the present invention, there are further provided a suction pump connected to the filtration membrane device for sucking purified water into the tank, and a supply pump for supplying purified water in the tank when reused. Since the water level sensors for detecting the respective water levels are provided in the treatment tank and the tank, in addition to the effects of the invention of claim 1 or 2,
Purified water can be used efficiently based on the water levels of the treatment tank and the tank detected by the water level sensor.

According to the fourth aspect of the present invention, the control unit for controlling the suction pump and the supply pump based on the detection result of the water level sensor is further provided. The efficient use of the purified water can be performed by automatic control by the control unit.

According to the fifth aspect of the present invention, since the tank is configured to be connectable to a washing tub of a washing machine or a water supply of a flush toilet, the invention according to any one of the first to fourth aspects is achieved. In addition to the effect, the purified water can be effectively used for a washing machine or a flush toilet.

[Brief description of the drawings]

FIG. 1 is a vertical sectional view of a sewage reclamation apparatus according to Embodiment 1 of the present invention.

FIG. 2 is a table showing a comparison between the results of a water quality test performed before the sewage by the sewage regenerator of FIG. 1 and the purified water obtained by the sewage regenerator.

FIG. 3 is a flowchart illustrating an operation of the sewage recycling apparatus of FIG. 1;

FIG. 4 is a vertical sectional view of a sewage reclamation apparatus according to Embodiment 2 of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Washing machine 2 Processing tank 3 Washing tub 4 Filtration membrane device 8 Suction pump 12 Tank 14 Electrode 15 Electrode 16 Power supply 18 Supply pump 20 Water level sensor 21 Water level sensor A 22 Water level sensor B

Claims (5)

[Claims] 1. A treatment tank for performing an activated sludge treatment on sewage, a filtration membrane device provided in the treatment tank for separating solid-liquid activated sludge mixed liquid in the tank by filtration, and a filtration membrane device. A wastewater regenerating device comprising: a connected tank for storing purified water as a filtrate for reuse. 2. The method according to claim 1, further comprising: at least one set of electrodes for eluting iron ions or aluminum ions by electrolysis for removing phosphoric acid in sewage in the treatment tank, and supplying a constant current for electrolysis to the electrodes. The sewage reclamation device according to claim 1, further comprising a power supply. 3. A suction pump connected to the filtration membrane device for sucking purified water into the tank, and a supply pump for supplying purified water in the tank when reusing the tank, the treatment tank and the tank being provided with a supply pump. 3. The sewage reclamation apparatus according to claim 1, further comprising a water level sensor for detecting each water level. 4. The sewage recycling apparatus according to claim 3, further comprising a control unit that controls the suction pump and the supply pump based on the detection result of the water level sensor. 5. The sewage recycling apparatus according to claim 1, wherein the tank is configured to be connectable to a washing tub of a washing machine or a water supply of a flush toilet.