KR100898080B1 - Filtration system containing dissolved air flotation facilities - Google Patents

Abstract

The present invention relates to a pressure flotation filter paper, which is capable of performing water treatment efficiently by adding a pressurized air flotation method to a filter paper in a water treatment process, and includes low density pollutants including algae, etc., which are difficult to settle in a sedimentation basin. Pressurized flotation on the filter paper reduced the load on the filter paper and prevented the filter paper from clogging, thereby increasing the filter duration.

Pressurized flotation, filter paper, water treatment

Description

Filtration system containing dissolved air flotation facilities

1 is a plan view of one embodiment of a pressure flotation filter paper of the present invention.

Figure 2 is a side cross-sectional view of one embodiment of a pressure flotation filter paper of the present invention.

Figure 3 is a side cross-sectional view of one embodiment without a scum collection device in the pressure flotation filter paper of the present invention.

Brief description of the reference numbers

11: water inlet pipe 12: drain pipe

21: pressure pump 22: air compressor

23: pressurized tank 24: pressurized water pipe

25: pressurized water injection nozzle 26: purified water

50: scum 51: scum collection device

52; Scum hopper 71: anthracite and / or activated carbon layer

72: filtered yarn 73: pore block

74: backwash device 75: distribution channel

101; Vertical bulkhead 102: central channel

The present invention relates to a filter paper including a pressure flotation device, and more particularly, a device capable of efficiently purifying water by using a pressurized air flotation method in combination with a filter paper water treatment, and is difficult to settle in a sedimentation basin. The low density of contaminants, including the high pressure on the filter paper to reduce the load of the filter paper, preventing the filter paper from clogging will increase the filter duration.

Existing water treatment process flows lake water, river water and ground water to mix coagulant and raw water in a rapid mixing tank and performs slow agitation in floc forming tank to flocculate suspended solids and colloidal materials of raw water mixed with coagulant. To form a huge floe, which is deposited from the clarifier to the bottom and treated by a sludge treatment system. After that, the filtration process, chlorine contact process or ozone disinfection process, and activated carbon adsorption.

Among them, anthracite and sand layer are formed so that the water injected from the top passes through the bottom to finally filter out fine contaminants or small specific gravity materials that are not removed from mixed paper, flocculant and sedimentation paper. It has a function to make it.

However, when the water quality of the raw water flowing into the water purification plant is poor or when the raw water contains a large amount of light matters, the pore blocking phenomenon of the filter paper is accelerated. In such a case, problems in operation and management occur, such as the need to temporarily stop the operation of the filter paper and perform backwashing.

Accordingly, the present invention is to provide a filter paper including a pressure flotation device that can overcome the problems of the prior art and improve the filtration efficiency in the filter paper, and can prevent the blockage of the filter paper.

In order to achieve the above object, the present inventors install a pressurized water pipe in which a plurality of pressurized water injection nozzles are formed in the lower part between vertical bulkheads installed at the center of the filter paper, and spray the pressurized water upwards with respect to the water to be treated from the settling basin. The small or fine contaminants are collected by the microbubbles generated by the pressurized water to rise to the surface, and scum, which is a mass of contaminants formed on the surface, is collected and removed when moved to the filter paper side end by the flow of water. In order to remove scum or floating contaminants by artificially collecting and removing scum, such as a scraper, a pressurized floating filter paper was invented.

The present invention

Untreated water inlet pipe (11) for supplying untreated water to the central waterway (102) formed by both side walls of the center of the filter paper; and

Pressurized pump 21 for producing and supplying pressurized water by introducing purified water and air; and

A pressurized water pipe 24 which is supplied from the pressurized pump 21 and has a pressurized water injection nozzle 25 for spraying pressurized water to raise the contaminants in the water to the central channel 102;

The scum hopper 52 for collecting and discharging the scum floating on the water surface of the filter paper; relates to a pressure flotation filter paper comprising a. The present invention uses a pressurized pump to produce pressurized water by allowing air to flow into the pressurized pump inlet without a separate pressurized tank and an air compressor in the pressurized floating filter paper.

In addition, the present invention

Untreated water inlet pipe (11) for supplying untreated water to the central waterway (102) formed by both side walls of the center of the filter paper; and

A pressure pump 21 for supplying purified water to the pressure tank 23; and

An air compressor 22 for compressing and applying air to the pressure tank 23; and

A pressurizing tank 23 for preparing and storing pressurized water by mixing purified water supplied by the pressurizing pump 21 and air supplied from the air compressor 22; and

A pressurized water pipe 24 provided with the pressurized tank 23 and having a pressurized water injection nozzle 25 for injecting pressurized water to raise the contaminants in the water to the central waterway 102; and

And a scum hopper 52 for collecting and discharging the scum, the scum collecting device 51 for collecting the contaminants injured on the water surface of the filter paper.

In addition, the pressurized floating filter paper of the present invention is connected to the pressurized water pipe, and additionally installed a pressurized water injection control device for measuring the water quality of the water to be treated so that the pressurized water is injected from one or more pressurized water pipes depending on the amount of pollutants. It is characterized by.

In addition, the pressurized floating filter paper of the present invention is characterized in that the control device of the scum collecting device for changing the driving speed of the scum processing apparatus by measuring the concentration of scum that floated to the upper layer of the filter paper by the floating material density sensor is installed. .

Hereinafter, the configuration of the present invention will be described in detail.

The present invention is the treated water inlet pipe (11) for supplying the treated water that has undergone the sedimentation process in the sedimentation basin to the central channel 102 formed by the two side partitions of the center of the filter paper, the pressure pump 21 for supplying purified water to the pressure tank (21) ), An air compressor 22 for compressing and applying air to the pressure tank 23, and a mixture of purified water supplied from the purified water by the pressure pump 21 and air supplied from the air compressor 22 to pressurized water. Pressurized tank 23 for manufacturing and storing, pressurized water pipe 24 formed with pressurized water injection nozzle 25, contaminants floating on the surface of the filter paper (in the description and drawings of the present invention, referred to as "scum" in the claims) The scum collecting device 51 and the scum hopper 52 which collect | recover) are comprised.

Hereinafter, the configuration and operation of the present invention will be described in detail with reference to the accompanying drawings. However, the scope of the present invention is not limited by the drawings.

The water to be treated (generally used in the description and drawings of the present invention, and used to mean water flowing into the filter paper through the flocculation paper or the flocculation paper) in the treatment water inlet pipe 11 It flows into the central channel 102 between the filter paper vertical partitions 101. In this case, a pump may be added to the water to be treated pipe 11 as necessary.

A pressurized pump 21 and an air compressor 22 are connected to a pressurized tank 23 for mixing and pressurizing water to produce pressurized water. The pressure pump 21 supplies the purified water supplied from the purified water to the pressurized tank. The air compressor 22 compresses the air and applies it to the pressure tank 23.

A portion of the treated water (purified water) is injected into the pressure tank 23 through the pressure pump 21, and then the water is pressurized to a pressure of 1 atm or higher, preferably 4 to 7 atm, using the air compressor 22. Sufficiently saturate the dissolved air. Fine air bubbles are generated by supplying pressurized water saturated with the dissolved air through the pressurized water injection nozzle 25. The air dissolved in the pressurized water is rapidly released under atmospheric pressure to form fine air bubbles such as pollutants, suspended matter, algae, etc., including low specific gravity particulate matter in water (hereinafter referred to as 'scum' in the present specification, aggregated algae, Floating materials, pollutants, etc.) and floats on the surface of the water. That is, the contaminants in the water to be treated are attached to the fine air bubbles of about 10 to 100 μm generated by the pressurized water sprayed from the pressurized water injection nozzle 25 to float above the water surface.

The pressurized water pipe 24 and the pressurized water injection nozzle 25 may be provided with one or more valves and a plurality of pressurized water pipes from the pressurized tank 23 as necessary. If the amount is large, the treatment efficiency can be further increased by simultaneously operating the plurality of pressurized water pipes 24 and the pressurized water injection nozzle 25.

In addition, when using a pressurized water pipe having a constant diameter, there is a problem that turbulence occurs near the pressurized tank. Thus, in the present invention, the diameter of the pressurized water nozzle in the portion of the pressurized water pipe close to the valve and the pressure is relatively high, and the nozzle diameter of the edge portion at the relatively low pressure far from the valve can be formed small (not shown in the drawing). In another way, the diameter of the pressurized water pipe can be made larger on the side closer to the pressurizing tank and smaller on the far side to prevent the generation of turbulence (not shown).

The scum (contaminants) rises to the surface of the filter paper by the pressurized water, and the scum collector 51 collects the scum of the surface of the filter paper, or naturally flows the scum to the scum hopper 52 and discharges it to the outside of the filter paper. Done. Representative scum collection device 51 includes a scraper (also referred to as a skimmer) is provided with a scraper that can move the scum in a fixed direction by scraping the scum on the track as shown in the drawing, in addition to the principle of the vacuum cleaner And scum suction devices similar to the above. In addition to the automatic operation of the scum scraper or scum suction device, the scum collection device may be used to manually collect scum. In FIG. 1, one scraper is provided at both ends of the vertical partition wall 101 at both ends of the filter paper, and a scum hopper is formed at both ends of the filter paper in parallel with the central channel. Those skilled in the art to which the present invention pertains can be installed to remove scum injured on the water while moving the scum collection device 51 such as a scraper to the left and right of the water surface. The scum collection device is not an essential element, and only the scum hopper 52 may be formed to collect scum according to the natural movement of water according to the flow of pressurized water (FIG. 3).

The injured scum was collected or manually collected using a scum removal device such as a scraper, and a scum hopper was placed at both ends of the filter paper to remove collected scum. The scum removed water is discharged to the purified water through the filter paper, and the collected scum is treated by sludge treatment such as concentration, dehydration, or dehydration alone. Another scum treatment method is sludge dewatered through a dewatering device such as a filter press, and the contaminant-removed water is retreated in a concentration tank.

In addition, the apparatus of the present invention by adding a pressurized water injection control device to measure the water quality, such as turbidity, pH of the water to be introduced into the inlet pipe 11, a large number of pressurized water injection device in the case of containing a large amount of contaminants. It can be operated by increasing the efficiency of treatment by reducing the number of pressurized water injectors operated in case of small amount of pollutants.

In the process of treating the suspended solids floating on the water surface from the filter paper, the present invention measures the density of the suspended solids to increase the driving speed of the scum collector when the density is high, and to drive when the density of the suspended solids is low. A scum collector control device can be added as a component that allows processing of suspended solids in a concentrated state by lowering the speed (not shown). The scum treatment apparatus generally adopted in the conventional pressure flotation method operates at a constant driving speed regardless of the concentration or amount of scum. Thus, if a large amount of scum is formed, the perfect treatment cannot be performed. If the concentration of the scum is low, the scum that contains a lot of water is treated, thereby reducing the efficiency of the subsequent sludge dewatering apparatus.

Thus, in the present invention, it is possible to add a control device of the scum collecting device which measures the concentration of scum rising to the upper layer of the filter paper as an independent variable and sets it as an independent variable, and makes the driving speed of the scum processing apparatus a dependent variable. The scum collection device control device of the present invention is linked to the scum collection device, it can cope with the situation changes, such as the large inflow of suspended solids due to the mass generation and heavy rain caused by the water temperature change. In addition, when the amount of suspended matter floated is small, the load of the dewatering device is reduced by lowering the driving speed of the scum collection device.

The present invention can significantly reduce the load of the filter paper by treating the contaminants such as low-density suspended solids, such as algae, which have not been processed through the flocculation tank, the floc forming tank, and the sedimentation basin, simply and quickly by floating them before the filtration step of the filter paper. .

Claims (5)

Untreated water inlet pipe (11) for supplying untreated water to the central waterway (102) formed by both side walls of the center of the filter paper; and Pressurized pump 21 for producing and supplying pressurized water by introducing purified water and air; and A pressurized water pipe 24 which is supplied from the pressurized pump 21 and has a pressurized water injection nozzle 25 for spraying pressurized water to raise the contaminants in the water to the central channel 102; A pressurized water injection control device connected to the pressurized water pipe 24 and configured to measure the water quality of the water to be treated so that pressurized water is injected from one or more pressurized water pipes according to the amount of contaminants; And And a scum hopper (52) for collecting and discharging the scum injured on the surface of the filter paper. Untreated water inlet pipe (11) for supplying untreated water to the central waterway (102) formed by both side walls of the center of the filter paper; and A pressure pump 21 for supplying purified water to the pressure tank 23; and An air compressor 22 for compressing and applying air to the pressure tank 23; and A pressurizing tank 23 for preparing and storing pressurized water by mixing purified water supplied by the pressurizing pump 21 and air supplied from the air compressor 22; and A pressurized water pipe 24 which is supplied from the pressurized tank 23 and has a pressurized water injection nozzle 25 for spraying pressurized water to raise the contaminants in the water to the central channel 102; and A pressurized water injection control device connected to the pressurized water pipe 24 and configured to measure the water quality of the water to be treated so that pressurized water is injected from one or more pressurized water pipes according to the amount of pollutants; and And a scum hopper (52) for collecting and discharging the scum injured on the surface of the filter paper. The method according to claim 1 or 2, Pressurized floating filter paper, characterized in that the scum collecting device 51 for collecting the scum floating on the surface of the filter paper is installed. delete The method according to claim 1 or 2, And a scum collecting device controlling device for changing the driving speed of the scum collecting device by measuring the concentration of scum rising to the upper layer of the filter paper using a suspended matter density sensor.

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