KR101491001B1 - Multi stage floatation apparatus - Google Patents

Abstract

The present invention provides a multi-stage floatation apparatus allowing a floatation tank with a greater capacity to be installed in the same floatation apparatus installation area and capable of improving floatation efficiency. The floatation apparatus for the floatation-based use and processing of contaminated raw water includes a supply line for supplying raw water mixed with a flocculant, a floatation tank that is connected to the supply line and is formed to have a plurality of processing zones, a microbubble supply unit that is provided with a microbubble injection unit which supplies microbubbles to the respective ones of the plurality of floatation tanks for attachment to the coagulated flocks in the raw water and flock floatation; and skimmer means that is disposed on the respective ones of the plurality of floatation tanks to skim the floating flocks. The present invention utilizes line and pipe mixers instead of rapid and slow mixing tanks of the related art, and thus a floatation tank having a relatively larger capacity can be installed and the floatation capacity can be improved. In addition, the raw water is subject to two times of floatation in series in the floatation tank, and thus the floatation efficiency in the floatation tank is improved.

Description

[0001] MULTI STAGE FLOATATION APPARATUS [0002]

The present invention relates to a multistage flotation apparatus of the present invention, and more particularly, to a multistage flotation apparatus capable of improving water treatment efficiency while occupying a small space.

Dissolved Air Floatatin is a technique in which a minute bubble is attached to a suspended phase contained in a dispersed medium to float to the limit surface where the dispersion medium and air are in contact to induce solid-liquid separation .

When the floating separation is used for the water treatment, it is a technique used to separate and concentrate the sludge in the water, sewage or waste water (dispersion medium) to separate contaminants (floating oil) such as suspended substances, oil and grease, (Air bubbles) are injected into the water, and when the injected air is combined with the contaminants in the water and floated to the upper part, the water pollution material is removed from the water side. In the water treatment apparatus using the floating separation, And the like.

These floating separation methods include mechanical levitation, pressure levitation, electrolytic levitation. Microbiological injury method. The double pressurized flotation method is a method used for flotation separation in which air is saturated by pressurizing the return water and then exposed to normal pressure to form fine air bubbles.

The pressurized flotation method is a vacuum flotation method in which air is saturated under atmospheric pressure and is put into a decompressed airtight vessel and then the solubility of air is reduced to form air bubbles. The mixture of gas and liquid in a supersaturated state is reduced in air to reduce air bubbles And the like.

Among them, the mechanical floating method is unsuitable for float separation of the water source, secondary treated sewage and wastewater because of the possibility of flooding of float due to severe turbulence. In case of electrolytic floating method, Electrolysis of water As a method of generating minute bubbles, a large amount of electric power is required, and a scale is generated and adhered to an electrode plate for electrolyzing water.

Therefore, in the case of secondary treatment water or water source water having an influent concentration of SS 5 ~ 40 mg / L and 5 ~ 30 NTU, most of the methods are applied by sedimentation and pressurization. When the bubbles are formed by supplying them, the size of the bubbles is fine and the floating separation efficiency is increased.

The pressurized flotation method removes contaminants by buoyancy by reducing the total specific gravity of the contaminants by attaching them to the contaminants by generating minute air bubbles up to 100 micrometers or less. It is a method of removing contaminants by means of buoyancy, Dissolved Air Flotation and a method to generate negative pressure by using a nozzle acting as an orifice in the return water supplied by a pressurizing pump. Dispersed Air Flotation).

As shown in FIG. 7, the conventional flotation apparatus for use in the pressurized flotation method comprises a rapid mixing tank 10, a low-speed mixing tank 20 connected to the rapid mixing tank 10, (30) connected to the flotation tank (30), and a flotation tank (40) connected to the flotation tank (30).

The raw water is supplied to the rapid mixing tank 10 and the flocculant is introduced into the rapid mixing tank 10 in the chemical tank 11 and then stirred by the stirrer 12 so that the element and the flocculant are mixed.

Then, the raw water mixed with the flocculant is moved to the slow-mixing tank 20 and is mixed again.

In the prior art, since the mixing action of the coagulant and the raw water must occur due to the two treatment zones of the rapid mixing tank 10 and the slow mixing tank 20, the size of the floatation separator becomes large, .

In addition, in the floating separation apparatus of the related art, two water tanks are required, namely, the rapid mixing tank 10 and the slow mixing tank 20, so that a wide installation space is required.

In the conventional flotation apparatus, raw water, which is secondarily mixed in the slow mixing tank 20, is transferred to the flotation tank 30, and then air pressurized by the pressurizing tank 31 is supplied to the jetting unit 32, The injection air adheres to the flocs contained in the raw water and floats.

The floated flocs are moved by the skimmer device 40 to the floc reservoir 31, and the remaining raw water is transferred to the discharge tank 50.

Since the air is adhered to the flocs while moving upward in the left region of the guide 33 in the float separation tank 30, the relative water retention time in the region on the right side of the guide 33 occurs, So that flotation efficiency of the flock is reduced in the raw water.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a floating separation device capable of installing a floating separation vessel having a larger capacity in the same floating separation device installation area and improving floating separation efficiency.

In order to achieve the above object, the present invention provides a multi-stage floating separation apparatus for treating contaminated raw water using floating separation, comprising: a supply line for supplying raw water mixed with a flocculant; A fine bubble supplying unit provided in each of the plurality of treatment zones and configured to inject fine bubbles; a fine bubble supplying unit installed in each of the plurality of treatment zones to form a fine bubble supplying unit, And means for providing a control signal.

In the multistage flotation apparatus of the present invention, the supply line may include a supply pipe connected to a chemical tank for supplying the coagulant, and a line mixer disposed at a rear end of a portion connected to the chemical tank in the supply pipe.

In the multi-stage flotation apparatus of the present invention, a pipe mixer is further provided at a rear end of the line mixer in the supply line.

In the multi-stage flotation apparatus of the present invention, the plurality of processing zones are connected in series with respect to the flow direction of the raw water.

In the multi-stage floating separation apparatus of the present invention, a partition wall is provided between one processing area and a processing area adjacent to the processing area in the plurality of processing areas, and a passage is provided in the bottom part of the partition so that the raw water can move between the processing areas And a fine bubble jetting portion of the adjacent processing zone is provided adjacent to the passage.

In the multi-stage floating device of the present invention, an upper partition wall is additionally formed above the lower partition wall in the partition.

In the multistage flotation apparatus of the present invention, the fine bubble supplying unit may include a pressurizing pump for pressurizing the raw water discharged from the floating separating tank, and a fine bubble generating unit connected between the pressurizing pump and the fine bubble jetting unit Wherein the micro-bubble generating unit includes a micro-bubble generator having a micro-bubble generating unit, a micro-bubble generator having a micro-bubble generating unit, a micro-bubble generator having one end connected to the pressurizing pump and the other end connected to the micro- And an injection port formed in the side portion.

In the multi-stage flotation apparatus of the present invention, at least one of air, chlorine gas, oxygen gas, and ozone gas is injected into the injection port.

In the multi-stage flotation apparatus of the present invention, the micro-bubble supplying section is composed of a plurality of micro-bubble supplying sections, and air is supplied from the micro-bubble supplying section connected to any one of the processing sections, And an ultraviolet lamp is installed in the processing zone where the ozone is supplied.

In the present invention, by using a line mixer and a pipe mixer in place of the rapid mixing tank and the full mixing tank in the conventional art, a space for installing the floating separation device is greatly reduced.

As a result, the size of the apparatus is reduced, so that the apparatus can be easily moved and installed and the installation space can be minimized.

In addition, in the floating separation tank, the floating separation operation is effected in series over the secondary water in the raw water, so that the floating separation efficiency in the floating separation tank is improved.

In the present invention, since the gas used for flotation separation is made fine by using a fine filter, dissolution into raw water is facilitated, and it is necessary to increase the capacity of the pressure tank for dissolution into raw water as in the prior art So that it has an advantageous effect in terms of cost, installation space and power consumption.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a view showing the entirety of a multi-stage flotation apparatus of the present invention. Fig.
2 is a diagram showing a line mixer in the multi-stage flotation apparatus of the present invention.
3 is a view showing a case where three or more floating separation chambers are formed in the multi-phase floating separation apparatus of the present invention.
4 is a view showing various embodiments of the passage formed in the partition wall in the multi-stage floating separation device of the present invention.
5 is a view showing a case where only one skimmer means is installed in the multi-stage floating separation device of the present invention.
6 is a view showing a microbubble generator in the multi-stage flotation apparatus of the present invention.
7 is a view showing a floating separation apparatus of the prior art.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a view showing the entirety of a multi-stage flotation apparatus of the present invention. Fig.

The multistage flotation apparatus of the present invention comprises a supply line (100) for supplying wastewater to be treated, a flotation tank (200) connected to the supply line (100), and a microbubble And a supply unit 300.

The supply line 100 is formed by a conventional pipe-shaped supply pipe 110. A line mixer 120 is installed in the supply pipe 110. A pipe mixer 130 is connected to the rear end of the line mixer 120. [ mixer) is installed.

The supply pipe 110 serves to supply chemicals required for the sewage from the chemical tank 101 to the raw water flowing through the supply pipe 110.

2 is a diagram showing a line mixer in the multi-stage flotation apparatus of the present invention.

The line mixer 110 includes a first blade 111 accommodated in one side of the supply pipe 21 and configured to twist and turn in one direction and a second blade 111 adjacent to the first blade 111 and pivoting in a direction opposite to the first blade A second blade 112 formed to intersect with the second blade 112 and configured to pivot in a direction perpendicular to the second blade 112, A blade 113 is installed.

Also, the pipe mixer 130 installed at the rear of the line mixer 110 is formed into a circular pipe shape having a generally curved shape.

The floating separation tank 200 is formed of a plurality of first and second processing zones 210 and 211 adjacent to each other in series.

3 is a view showing a case where three or more floating separation chambers are formed in the multi-phase floating separation apparatus of the present invention.

The present embodiment is not limited to the case where the floating separation tank 200 is formed of two treatment zones, but it may be formed as three (210, 211, 212) or a plurality of four or more as shown in FIG. 3 .

4 is a view showing various embodiments of the passage formed in the partition wall in the multi-stage floating separation device of the present invention.

A partition wall 220 is formed between the first treatment area 210 and the second treatment area 211 and a lower partition wall passage 221a for the flow of raw water is provided below the partition 220.

The lower partition passage 221a may be formed in any shape as long as it secures a passage for flowing the raw water of the first treatment zone 210 into the second treatment zone 211.

For example, as shown in FIG. 4A, the lower partition wall passage 221a may be formed in the shape of a penetrating bearing, or may be formed as shown in FIG. 4B such that the partition wall 220 is spaced upward from the bottom of the processing zone, ) Can be formed.

Also, the lower partition wall passage 221a may be formed by a plurality of through holes as shown in FIG. 4C.

On the other hand, a separate upper partition wall 221b may be additionally formed on the lower partition wall passage 221a.

The upper partition wall passage 221b may be formed with a plurality of through holes as shown in FIG. 4C or may be formed with one hole as shown in FIG. 4D.

Also, as shown in FIG. 4C, the lower partition wall passage 221a and the upper partition wall passage 221b may be uniformly formed over the entire partition wall 220. FIG.

A passage 211b is provided in the bottom of the outer wall 211a of the second treatment zone 211 and a drainage reservoir 222 is formed in the second treatment zone 211. [

On the other hand, skimmer devices 230 and 231 of known configurations are installed on the upper portions of the first and second treatment zones 210 and 211, respectively.

The skimmers 230 and 231 are provided with blades 232 to move floated flocs and transfer them to the flock rejection unit 240 installed on each of the processing areas 210.

5 is a view showing a case where only one skimmer means is installed in the multi-stage floating separation device of the present invention.

In another embodiment of the present invention, it is also possible to form only one skimmer means.

That is, as shown in FIG. 4, only one skimmer device 230 may be formed on the first and second processing zones 210 and 211.

At this time, the upper end of the partition 220 is formed to have a height that does not interfere with the blade 232 of the skimmer device 230.

On the other hand, a fine bubble jetting part 250 and a guide 260 are provided on the bottom of each of the processing areas 210 and 211.

Each processing zone 210 and 211 is connected to the fine bubble supplying unit 300.

First, the minute bubble supplying unit 300 includes a pressurizing pump 310 connected to the drain water reservoir 222, a minute bubble generator 320 connected to the pressurizing pump 310, and the fine bubble generator 320, And a distribution pipe 340 connecting the dissolution tank 300 and the micro-bubble spraying unit 250. The micro-

6 is a view showing a micro-bubble generator in the multi-stage flotation apparatus of the present invention.

The microbubble generator 320 includes a flow pipe 321, a fine filter 322 provided inside the flow pipe 321, and an injection port 323 provided at the side of the flow pipe 310 .

At least one of air, chlorine gas, oxygen gas, and ozone gas is injected into the injection port 323.

 However, the present invention is not limited to this, and it is also possible to form a plurality of fine bubble supplying units.

3, in the other processing zone 212 in which air is supplied through the first micro-bubble supplying unit 300 and the ultraviolet ray irradiating unit 212a is provided inside the processing zone 210 and 211, the second micro-bubble supplying unit 350 To supply ozone.

Next, the operation of the multi-stage flotation apparatus of the present invention constructed as described above will be described.

The raw water flowing through the supply pipe 110 passes through the line mixer 120 and passes through the first, second and third blades 111, 112 and 113 formed in the line mixer 120 so as to be twisted, And the coagulant supplied from the agitator is mixed with each other and mixed.

The raw water mixed with the flocculant in the line mixer 120 firstly passes through the pipe mixer 130 having a curvature shape to perform secondary mixing operation.

As described above, in the present invention, since the coagulant and the raw water are sufficiently mixed by the line mixer and the pipe mixer twice, the two processing zones of the high-speed admixing treatment zone and the low-speed admixing treatment zone become unnecessary as in the prior art, It is simple and takes up little volume.

In addition, when the multi-stage flotation apparatus having the same processing capacity is installed, the processing capacity of the multi-stage flotation apparatus is generally increased by allocating the space occupied by the high-speed admixture processing zone and the low-speed admixture processing zone to the flotation separation vessel.

The raw water that has passed through the pipe mixer 130 is supplied to the first processing zone 210. At this time, minute bubbles are injected from the minute bubble jetting unit 250 installed at the bottom of the first processing zone 210, The micro bubbles are lifted upward along the guide 260.

Microbubbles adhere to the flocculated floccules in the flocculant inside the raw water, so that flocs float on the upper surface of the treatment zones 210 and 211 due to the floating force of the microbubbles.

The floated flocs are moved by the rotating blade 231 in the skimmer device 230 and transported and stored in the flock counter 240 installed in the processing areas 201 and 211.

On the other hand, the raw water in the first processing zone 210 moves to the second processing zone 211 along the partition passage 221 formed in the lower part of the partition 220.

The minute bubbles sprayed from the bottom of the first treatment zone 210 float upwards because the water bubbles are light. At this time, the minute bubbles are floated upward along the guide 260. Thus, the raw water present in the lower right surface of the guide 260 in the first treatment zone 210 corresponds to a relatively non-flowable water body.

The enemy water present in the marine waters has a relatively low chance of contact with the micro-wastewater, and thus the floating effect of the flock is reduced in the raw water of the marine waters.

However, as described above, the raw water existing in the four water bodies flows into the bottom portion of the second processing zone 211, and the minute bubbles injected from the second minute bubble jetting section 251 float on the flocculated floes in the raw water The purification effect of the raw water and the flotation effect of the floc are increased.

That is, in the present invention, the flocs agglomerated in the raw water are primarily floated in the first treatment zone 210, and then flowed into the micro-bubble generator 251 of the adjacent second treatment zone 211 without occurrence of the sub- Flocs that have not been flashed in the first treatment zone 210 float in the second treatment zone 211, so that the treatment of flocs is generally improved.

The raw water floated in the second treatment zone 211 is discharged to the effluent storage tank 222 through the passage 211b formed at the bottom of the outer wall 211a.

A portion of the raw water purified in the effluent storage tank 222 is supplied to the fine bubble generator 320 through the pressurizing pump 310.

When the raw water flows through the flow pipe 321 of the minute bubble generator 320 by the pressurizing pump 310, at least one of the outside air, the chlorine gas, the oxygen gas, and the ozone gas Gas is introduced.

At this time, the air flows through the plurality of micropores 322a formed on the surface of the fine filter 322, and basically the air is reduced in size.

Next, the introduced fine air is cut again by the flowing raw water, and the size of the air is further reduced to form fine bubbles.

The formed fine bubbles flow into the dissolution tank 330 and stay for a predetermined time, thereby increasing the solubility of the raw water and the micro-bubbles.

Then, the minute bubbles are supplied to the first and second processing zones 201 and 211 through the first and second minute bubble spray units 250 and 251 together with the raw water through the delivery pipe 340.

In another embodiment of the present invention, it is also possible to supply gases different from each other as shown in FIG.

In the case of FIG. 3, when ozone is sprayed as a gas in the treatment zone 212 and ultraviolet rays are irradiated to the raw water through the ultraviolet ray irradiation unit 212a, OH radicals are generated, so that strong oxidizing power is generated, do.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the scope of the present invention is not limited to the disclosed exemplary embodiments, Can be varied in various forms.

100: supply line 200: floating separation tank
300: fine bubble supplying unit

Claims (9)

A multi-stage flotation apparatus for treating contaminated raw water using flotation separation,
A supply pipe for supplying raw water,
A chemical tank connected to the supply pipe for supplying the flocculant,
A line mixer installed at a rear end of a portion of the supply pipe connected to the chemical tank and having a plurality of blades therein to agitate the coagulant and raw water,
A pipe mixer installed at a rear end of the line mixer for bending the raw water mixed with the flocculant,
A first processing zone connected to the pipe mixer and a second processing zone connected in series with the flow direction of the raw water adjacent to the first processing zone, A float separating tank partitioned by the float separating tank,
A fine bubble supplying unit provided at a lower portion of each of the first and second processing zones and having a fine bubble jetting unit for injecting fine bubbles;
And a skimmer means provided on each of the first and second treatment zones for removing the flocks floated by the minute bubbles supplied by the minute bubble supplying unit,
Each of the minute bubble supplying units includes:
A pressurizing pump for pressurizing the raw water discharged from the floating separation tank,
And a fine bubble generator connected between the pressurizing pump and the fine bubble expander,
Wherein the micro-
A flow pipe having one end connected to the pressurizing pump and the other end connected to the fine bubble spraying section,
A micro filter provided inside the flow tube and having a plurality of micropores,
And a gas inlet formed at a side of the flow tube,
A lower partition wall is provided in the lower part of the partition so that the raw water present in the bottom of the first processing area can move to the neighboring second processing area,
The fine bubble supplying unit is provided on the bottom surface of the second processing zone adjacent to the lower partition passage,
Characterized in that raw water from which flocks have been removed from the first treatment zone is secondarily treated in the second treatment zone. delete delete delete delete The method according to claim 1,
And an upper partition wall passage is further formed above the lower partition wall in the partition. delete The method according to claim 1,
Wherein at least one of air, chlorine gas, oxygen gas, and ozone gas is injected into the gas inlet. The method of claim 8,
The fine bubble supplying unit includes a plurality of fine bubble supplying units,
Air is supplied from the fine bubble supplying unit connected to any one of the processing zones,
The ozone is supplied to the fine bubble supplying unit connected to the other of the processing zones,
Wherein the ultraviolet lamp is installed in the processing zone where the ozone is supplied.

Images