JPH10109095A - Water purifying treatment device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To constitute the device of two filtering parts in a filter tower and to reduce a required installation area by providing a filter layer packed active coal in an upward counter flow type filter tower, and arranging an immersed type membrane module at the upper side of the filter layer. SOLUTION: At the water purifying treatment, the raw water after an aggregation and precipitation treatment is introduced into the filter tower 10, and is passed through the filter layer 11 packed the active coal. At this time, chemical substance such as ammonia is adsorbed and organic matters are decomposed and removed with microorganisms stuck to the surface of the active coal. Next, the water is sucked with a suction pump 15, transmitted a hollow fiber membrane of the membrane module 12, passed a treated water flow-out pipe 13 and is temporarily stored in a treated water tank 16. At the time of regeneration, the suction pump 15 is stopped and a valve 14 is closed, and then a blower 20 is driven and air is blown into the filter layer 11 from a diffusion pipe 19. A valve 22 is opened and a backwashing pump 17 is driven, and then a valve 23 is opened and the treated water is introduced into the filtering tower 10, and next a valve 18 is opened and the treated water is fed into the hollow fiber membrane in the membrane module 12 to wash it.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a water purification system for water supply.

[0002]

2. Description of the Related Art Conventionally, in water purification treatment of waterworks, an operation of adding a flocculant to river water, lake water, or the like that has been withdrawn to coagulate and precipitate a suspended matter, and then performing a chlorine treatment. However, in recent years, in particular, in water purification treatment of waterworks in the suburbs of large cities, treatment by an advanced treatment system has been performed along with deterioration of water quality of a water source. This advanced treatment is based on a combination of coagulation precipitation treatment, treatment with biological activated carbon filtration or ordinary biofilm filtration, and ozone treatment.

[0003] Biological activated carbon filtration, which is one of the treatment methods selected in an advanced treatment system, is a treatment method in which a treatment for adsorbing various components and a treatment for biologically decomposing organic substances are simultaneously performed. The decomposition of organic matter is carried out by the action of microorganisms that grow while passing raw water through the surface of the filled activated carbon. Therefore, when the filtration is performed by biological activated carbon, not only various components are adsorbed, but also decomposition and removal of organic substances are performed.

FIG. 2 is a diagram showing an example of a configuration relating to a water purification apparatus using a conventional advanced treatment system. This apparatus comprises a filtration tower 30 as a first filtration apparatus and a second filtration apparatus 40 by a sand filtration method or a method using a separation membrane, and a filtration layer filled with granular activated carbon in the filtration tower 30. 31 are provided. In the drawing, reference numeral 32 denotes an air diffuser for blowing air for flowing the filter layer 32 when the water purification operation is stopped and the filtration tower 30 is washed, and 33 denotes an air diffuser 32.
It is a blower that sends air to

When water purification treatment is performed by this apparatus, raw water subjected to coagulation and sedimentation is supplied to a filtration tower 30, and this raw water is purified while passing through a filtration layer 31, and is discharged as treated water. Here, organisms such as protozoa and metazoans that have propagated in the filter layer 31 are mixed into the treated water.
After sending the treated water to the second filtration device 40 for filtration, the treated water is sent to a water purification tank.

[0006]

However, in the above-mentioned conventional water purification apparatus, the second filtration device 40 must be arranged independently in addition to the filtration tower 30 for purifying raw water. Space is required, and a reduction in space is desired.

[0007] It is an object of the present invention to provide a water purification treatment apparatus requiring a small installation space.

[0008]

In order to achieve the above object, a water treatment apparatus according to the present invention is provided with a filter bed filled with activated carbon in an upflow type filtration tower. Is characterized in that a immersion type membrane module is disposed above the above.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a diagram showing an example of the configuration of a water purification apparatus according to the present invention. In FIG. 1, reference numeral 10 denotes an upward-flow filtration tower, in which a filtration layer 11 filled with granular activated carbon is provided. Then, a immersion type membrane module 12 is disposed above the filter layer 11. This membrane module 12 is immersed in raw water. The membrane module 12 is composed of a number of hollow fiber membranes, and has a structure in which raw water permeates from the outside to the inside of the hollow fiber membrane, and the secondary side thereof is connected to the treated water outflow pipe 13. ing. Further, when performing filtration by the membrane module 12, it is necessary to generate a differential pressure for allowing treated water to permeate from the outside to the inside of the hollow fiber membrane. In this system, the treated water is sucked by the suction pump 15 that has been used.

In FIG. 1, reference numeral 16 denotes a treatment water tank for temporarily storing treated water, and reference numeral 17 denotes a pump for back washing the membrane module 12. Reference numeral 19 denotes an air diffuser for blowing air for flowing the filter layer 11 when the water purification operation is stopped and the filtration tower 10 is washed, and reference numeral 20 denotes a blower for sending air to the air diffuser 19. Reference numeral 21 denotes a trough for discharging washing wastewater generated when the filtration tower 10 is washed.

[0011] The water purification treatment by the apparatus having the above configuration is performed as follows. The raw water subjected to the coagulation and sedimentation treatment is introduced into the lower part of the filtration tower 10 and rises and passes through the filtration layer 11. The filter layer 11 is filled with granular activated carbon, and on the surface of the activated carbon, microorganisms that have propagated in the past water have settled. The chemical substances are adsorbed and the organic substances are decomposed and removed. The water that has passed through the filter layer 11 passes through the hollow fiber membrane of the membrane module 12 that is sucked by the pump 15 and is temporarily stored in the treated water tank via the treated water outflow pipe 13.

If such a filtration operation is continued for a long time, the suspended matter is trapped and adhered in the filter layer 11 filled with the activated carbon, and also on the outer surface of the hollow fiber membrane of the membrane module 12. If the organisms or suspended matter leaked from the filter layer 11 adhere to the filter, and if the amount of the adhered substance exceeds a certain limit, the filtration resistance increases and the predetermined filtration rate cannot be maintained. For this reason, when it becomes the above-mentioned state, the supply of the raw water is stopped, and both of them are washed at the same time.

First, in order to wash the filter layer 11, the suction pump 15 is stopped and the valve 14 is closed.
Is started to blow air from the air diffuser 19 into the filter layer 11. After the valve 22 is opened and the backwashing pump 17 is started, the valve 23 is opened and the temporarily stored treated water is introduced into the bottom of the filtration tower 10 as washing water. Next, in order to wash the membrane module 12, the valve 18 is opened and the temporarily stored treated water is used as washing water to clean the membrane module 12.
Into the hollow fiber membrane.

In the filter layer 11, the activated carbon flows by the blown air, and the deposits are separated. Also,
In the membrane module 12, the water in the hollow fiber membrane flows backward by the introduction of the washing water, and air scrubbing of the hollow fiber membrane is performed by the air blown from the diffuser pipe 19. I do. The water contaminated by the activated carbon of the filter layer 11 and the deposits separated from the hollow fiber membrane of the membrane module 12 overflows the washing / draining trough 21 and is discharged therefrom, and sent to a water purification tank.

When the activated carbon of the filter layer 11 and the hollow fiber membrane of the membrane module 12 have been cleaned, the blower 2
0, the backwash pump 17 is stopped, and each valve is returned to the state at the time of the filtration operation.
5 is started and it shifts to a filtration operation.

As described above, the above device according to the present invention comprises:
Since a filtration layer 10 and a membrane module 12 are provided in a filtration tower 10 and two functions are contained in one apparatus,
In addition to having the advantage that the required installation area is small and that it can be installed even in a small place, it also has the advantage that the amount of air required for cleaning the filtration tower 10 and the membrane module 12 can be small. Also have.

That is, in the conventional water treatment apparatus in which the second filtration device is separately installed, when the second filtration device is washed, air blown from the bottom together with the washing water is required. In the apparatus of the above-described apparatus according to the present invention, since the membrane module 12 is disposed on the filter layer 11, the air blown from the diffuser pipe 19 to flow the filter layer 11 flows again above the filter layer. Module 12
Is used as air for air scrubbing, so that the amount of air required for cleaning the membrane module 12 is reduced.

The membrane used for the membrane module 12 is not necessarily a hollow fiber membrane, but may be a flat membrane or the like.

The method of generating a pressure difference between the inside and the outside of the membrane during filtration by the membrane module 12 may be the above-mentioned suction type or the type utilizing a difference in water level.

[0020]

According to the present invention, a filter layer is provided in an upward-flow type filtration tower, and a immersion type membrane module is disposed above the filter layer. , The required installation area is small, and it can be installed in a small place.

Further, a filter layer and a membrane module are arranged vertically in the filter tower, and both can be washed simultaneously in the same tower. Therefore, air blown for washing the filter layer is removed by the membrane. It can also be used for cleaning the module, reducing the size of the blower and saving power.

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration of an example of a water purification apparatus according to the present invention.

FIG. 2 is a diagram showing an example of a configuration relating to a water purification treatment device using a conventional advanced treatment system.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Filtration tower 11 Filtration layer 12 Membrane module 13 Treated water outflow pipe 15 Suction pump 16 Treatment water tank 17 Backwash pump 19 Air diffuser 20 Blower 21 Trough for washing and drainage

──────────────────────────────────────────────────の Continuation of front page (51) Int.Cl. ⁶ Identification code FI C02F 9/00 502 C02F 9/00 502E 504B 504 B01D 23/14

Claims (1)

[Claims] 1. A water purification system for a water supply system, wherein a filter layer filled with activated carbon is provided in an upward flow type filtration tower, and a immersion type membrane module is disposed above the filter layer. A water purification treatment device characterized by the above-mentioned.