JP2005095812A - Water purifying device and water purifying method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an underground water purifying device with the installation space miniaturized. <P>SOLUTION: In the underground water purifying device composed of: a submerged pump for well water; an iron removing-manganese removing apparatus; an active carbon filtering apparatus; and a separation membrane module, a means of storing underground water subjected to iron removing-manganese removing treatment and underground water subjected to active carbon filtering treatment is not included. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

 The present invention relates to a water treatment apparatus, and more particularly to an apparatus and a purification method for treating groundwater as purified water.

 Conventionally, when groundwater is treated as purified water, it is pumped up once by a submersible pump attached to a well and stored in a water tank, and again through the iron removal, manganese removal device, activated carbon filtration device, and backwash water again. The method of storing in the receiving tank for securing was common.

  In Patent Documents 1 and 2, a water purification apparatus having a configuration in which raw water treated in the microorganism treatment section is directly fed to the membrane filtration section, or a water purification apparatus having a configuration in which a filtration membrane unit is installed in the microorganism treatment section. Is disclosed.

Patent Document 3 discloses that both the filtration operation in the filtration membrane module and the back washing of the filtration membrane module are performed using the same pump.
JP-A-10-290993 Japanese Patent Laid-Open No. 10-323683 JP 2001-347268 A

 However, in the conventional method, a large facility installation space was required due to an increase in the number of water receiving tanks, and the number of pressurized water supply pumps increased, and preparations such as power supplies for facilities on the user side were increasing in size. There has been a demand for cost reduction as well as facility size reduction. Even in the configurations of Patent Documents 1, 2, and 3, miniaturization is not sufficient.

 In order to treat groundwater to tap water level purified water, a minimum of iron and manganese removal equipment, activated carbon filtration equipment, membrane filtration equipment, and, if necessary, chlorine sterilization equipment are required. However, it was physically impossible to install it at a customer who needed a lot and was difficult to secure the installation location.

 Therefore, development of a system with a small installation space has been demanded.

  In view of such a situation, the present inventor has intensively studied to solve the above-mentioned problems. As a result, in the design of a water treatment device, in particular, a groundwater purification device, without significantly reducing the level of treated water quality. The groundwater purification system has been developed with a much smaller capacity than ever before, and the installation space has been reduced in size.

 In other words, we have developed a compact device that directly connects the submersible pump of the well, the iron removal / manganese removal device, the activated carbon filtration device, and the separation membrane filtration unit.

  The invention of claim 1 is a groundwater purification apparatus comprising a submersible pump for well water, iron removal, manganese removal apparatus, activated carbon filtration apparatus, and separation membrane module, groundwater subjected to iron removal and manganese removal, and activated carbon filtration treatment. It is a groundwater water purifier characterized by not including a means for storing the groundwater.

  Further, the invention of claim 5 relates to a groundwater purification method in which groundwater is pumped up by a submersible pump for well water and purified using an iron removal, manganese removal device, activated carbon filtration device, or separation membrane module. A groundwater purification method characterized in that groundwater treated with an apparatus and an activated carbon filtration device is treated as it is with a separation membrane module without being stored in a tank.

  The groundwater water purification apparatus that is the subject of the present invention comprises a well submersible pump, iron removal, manganese removal apparatus, activated carbon filtration apparatus, separation membrane module, and the well water pumped up by the submersible pump removes iron, It processes using either a manganese removal apparatus and an activated carbon filtration apparatus, or both. Whether to treat only one or both depends on the quality of the well water. The treated water is then purified by the separation membrane module to become permeated water.

  The present invention is a pretreatment device for the iron removal, manganese removal device, and activated carbon filtration device described above, in which pretreated groundwater is not stored in a tank, but directly sent to a separation membrane module to obtain filtered water. is there. Conventionally, since the pretreated groundwater was once stored in the tank, the apparatus was enlarged, but the tank can be omitted.

  A second aspect of the present invention is the groundwater purification apparatus according to the first aspect of the present invention, which has an inverter for optimizing the flow rate and pressure of groundwater supplied to the iron removal and manganese removal apparatus. The invention of claim 6 is the purification method according to claim 5, wherein the flow rate and pressure of groundwater supplied to the iron removal and manganese removal apparatus are optimized by an inverter.

  By controlling the operation of the submersible pump that pumps up the groundwater with an inverter, it is possible to operate at a more preferable flow rate and pressure.

  Further, the invention of claim 3 is directed to a water purification apparatus comprising a tank for storing permeated water filtered by the iron removal, manganese removal apparatus, activated carbon filtration apparatus, separation membrane module, and separation membrane module. And it is a water purification apparatus characterized by having one backwashing means for backwashing both the iron removal / manganese removal apparatus and the activated carbon filtration apparatus.

  According to the seventh aspect of the present invention, the permeated water filtered by the separation membrane module is temporarily stored in a tank for backwash water, and the permeated water is periodically backwashed by a backwash pump using the permeated water. The back cleaning of the iron / manganese removal device and the activated carbon filtration device is also carried out with the permeated water in the same tank using the same pump.

  The same pump is used to perform both backwashing of pretreatment devices such as iron removal, manganese removal device, and activated carbon filtration device, and backwashing of the separation membrane module. As a result, the number of pumps, by extension, the wiring, the power supply, and their installation locations can be reduced, and as a result, the installation space for the apparatus can be reduced.

  The type of the separation membrane module is not particularly limited, and for example, an MF membrane, an ultrafiltration membrane, an NF membrane, an RO membrane, or the like can be used.

 The groundwater purification apparatus according to the present invention is configured in a very compact manner, can be constructed in a short time even at the time of installation, and secures the installation location because the installation space is small. Furthermore, the structure is simple, excellent in reliability, and maintenance management can be easily performed at low cost.

 Hereinafter, the present invention will be specifically described with reference to the drawings. The present invention is not limited to the examples. . FIG. 1 is a flow sheet showing an example of the groundwater purification apparatus of the present invention.

  The groundwater water purification apparatus includes at least iron removal, manganese removal apparatus, activated carbon filtration apparatus, and separation membrane module that are used as necessary, and these are connected by piping or the like, as shown in FIG. Alternatively, other configurations necessary for water treatment not shown in FIG. 1 may be included. In addition, FIG. 1 shows each component, the connection state of each component, and a water treatment flow, and does not show the arrangement state of each component or the size of the entire apparatus.

  The groundwater pumped up from the well by the submersible pump 1 passes through the pipe 14 and is supplied as it is from the liquid inlet / outlet 15 to the iron removal / manganese removal device 2, where iron and manganese are removed and discharged from the liquid inlet / outlet 16. Next, the solution is fed through the pipe 17 and supplied from the liquid inlet / outlet 18 of the activated carbon filtration device 3 to be treated with activated carbon. The activated carbon-treated liquid is discharged from the liquid inlet / outlet 19.

  The pretreated water is then pressurized by the separation membrane filtration circulation pressurization pump 4 through the pipe 20 and supplied from the liquid inlet / outlet 31 to the separation membrane module 5. At this time, a tank for storing treated water is not installed between the iron removal, manganese removal apparatus, activated carbon filtration apparatus, and separation membrane module, and the pretreated water is directly supplied to the separation membrane module 5. The liquid is to be sent.

  At this time, the operation of the well submersible pump 1 is brought into an optimum operation state by the inverter 11 built in the control panel 10 so that the inlet pressure of the circulation pressure pump 4 for separation membrane filtration is about 0 to 0.05 MPa. To control.

  The concentrated water concentrated by the separation membrane module 5 is recycled to the inlet of the circulation pressurization pump 4 through the pipe.

  On the other hand, the permeate is sent to the permeate tank 8 and stored. The tank 8 is also used as a separation membrane backwash tank 8. The permeated water supplied to the tank 8 is then stored in the supply tank and supplied to the use point.

  In order to use as purified water, sodium hypochlorite is added to the treated water at the inlet side of the separation membrane module 5 from the sodium hypochlorite storage tank 9 with an injection pump 12. At that time, since the sodium hypochlorite concentration in the permeated water needs to be a specified concentration, monitoring is performed with the hypochlorous acid concentration monitor 6 to adjust the amount of sodium hypochlorite charged.

  Further, sodium hypochlorite is added to the pipe 14 on the inlet side of the iron removal / manganese removal apparatus 2 for removing iron ions and manganese ions in the groundwater by the sodium hypochlorite injection pump 13.

  When the separation membrane module is regularly backwashed, the backwash water stored in the backwash water tank 8 is used to perform back filtration washing with the backwash pump 7. The pump 7 introduces backwash water through the pipe 27 through the liquid inlets 28 and 29, and the membrane is washed. The backwash water is discharged from the liquid outlets 30 and 31, passes through the pipes 32 and 33, and flows out as drainage from 25.

  On the other hand, the periodic backwashing of the iron removal, manganese removal device 2 and activated carbon filtration device 3 which are pretreatment devices is performed by the same backwash pump 7 used for backwashing the separation membrane module by switching the valve of the pipe. It implements using the backwash water stored in the backwash water tank 8.

  At the time of backwashing of the iron removal and manganese removal equipment, the permeated water stored in the backwash water tank 8 by the backwash pump 7 passes through the pipes 26 and 21 as backwash water and passes through the liquid inlet / outlet 16. It is sent to the iron removal and manganese removal equipment. The backwash water passes through the apparatus and is discharged from the liquid inlet / outlet 15. The discharged backwash water then flows out from 25 via the pipes 23 and 24.

  On the other hand, when the activated carbon filter is backwashed, the permeated water stored in the backwash water tank 8 by the backwash pump 7 passes through the pipes 26 and 22 from the liquid inlet / outlet 19 as backwash water. Sent into activated carbon filter. The backwash water passes through the apparatus and is discharged from the liquid inlet / outlet 18. The discharged backwash water then flows out from 25 via the pipe 24.

The flow sheet of the underground water purification apparatus of this invention.

Explanation of symbols

1 Submersible pump for well 2 Iron removal / manganese removal device 3 Activated carbon filtration device 4 Separation membrane circulation pressurization pump 5 Separation membrane module 6 Sodium hypochlorite concentration monitor 7 Backwash pump 8 Backwash tank 9 Sodium hypochlorite storage Tank 10 Control panel 11 Inverter 12 Sodium hypochlorite injection pump 13 Sodium hypochlorite injection pump

Claims (7)

Means for storing iron removal, manganese-removed groundwater, and activated carbon filtration-treated groundwater in a groundwater water purification device comprising a submersible pump for well water, iron removal, manganese removal equipment, activated carbon filtration equipment, and separation membrane module A groundwater water purification apparatus characterized by not containing. The groundwater water purification apparatus of Claim 1 which has an inverter which optimizes the flow volume and pressure of groundwater supplied to an iron removal and manganese removal apparatus. In a water purification apparatus comprising a tank for storing permeated water filtered by an iron removal, manganese removal apparatus, activated carbon filtration apparatus, separation membrane module, and separation membrane module, a separation membrane module and an iron removal / manganese removal apparatus, A water purifier having one backwashing means for backwashing both activated carbon filtration devices. The apparatus according to any one of claims 1 to 3, wherein the separation membrane module is composed of any one of an MF membrane, an ultrafiltration membrane, an NF membrane, and an RO membrane. In groundwater purification methods that pump groundwater with a submersible pump for well water and purify it using iron removal, manganese removal equipment, activated carbon filtration equipment, and separation membrane modules, it is treated with iron removal, manganese removal equipment, and activated carbon filtration equipment. The groundwater purification method is characterized in that the groundwater is not stored in the tank but is directly processed by the separation membrane module. 6. The purification method according to claim 5, wherein the flow rate and pressure of groundwater supplied to the iron removal and manganese removal apparatus are optimized by an inverter. The permeate filtered by the separation membrane module is temporarily stored in a tank for backwash water, and the permeate is used to backwash the separation membrane module regularly with a backwash pump. A method for purifying water, wherein the backwashing of the filtration device is also carried out with the permeated water in the same tank using the same pump.

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