KR20030079414A - The waster water treatment system and method - Google Patents

Abstract

PURPOSE: Provided are a system and a method for effectively removing stench, algae, oils, greases, synthetic detergent, ferrite, magnesium, organic material, and volatile organic compounds (VOCs) and reducing treatment time and installation area of facilities. CONSTITUTION: The system comprises a dissolved air flotation tank(10) for floating contaminants to the surface of water by mixing raw water and air to separate the contaminants, a scum scrapper(20) installed above the air flotation tank(10) for removing scum floated on the surface of the wastewater, a water level controller(30) for adjusting water level by opening and closing a treated water discharge pipe(110) of the tank(10) so as for the scum to be removed by the scum scrapper(20), a pump(40) for pumping a portion of the treated water running through the treated water discharge pipe(110) connected to the tank(10) to a first circulation pipe(120), an air generator(50) for generating bubbles by mixing the circulation water of the circulation pipe(120) and air and distributing the bubbles to an auxiliary tank(11) of the air flotation tank(10), a compressor(60) for compressing air supplied through an air pipe(160) connected to the air generator(50), and an air pressure controller(70) for keeping a pressure of air to be supplied to the air generator(50) from the compressor(60). The method comprises the steps of coagulating raw wastewater by circulating the raw water to the auxiliary tank(11) of the air flotation tank(10), adjusting water level of the air flotation tank(10) so as for scum to be removed, generating bubbles by mixing the circulation water and compressed air supplied by the compressor(60), distributing the bubbles to the auxiliary tank(11) of the air flotation tank(10), floating scum to the surface of the raw water while the raw water flows from the auxiliary tank(11) to the air flotation tank(12), removing the scum by the scum scrapper(20), settling large floc to the bottom of the air flotation tank(10), collecting and discharging sludge, discharging a portion of the treated water through the treated water discharging pipe(110), and circulating a portion of the treated water to the circulation pipe(120) using the pump(40).

Description

Concentrated organic wastewater treatment system linking pressurized flotation and flocculation sedimentation {The waster water treatment system and method}

The present invention relates to a high concentration organic wastewater treatment system and method thereof, and more particularly, to a high concentration organic waste for removing various harmful substances or contaminants in drainage discharged from factories, offices, homes, etc. in conjunction with flotation separation and sedimentation separation. The present invention relates to a wastewater treatment system and a method thereof.

Generally, wastewater treatment systems use a series of physical treatments (unit operations) and chemical or biological treatments (unit processes) to purify livestock wastewater, household sewage, factory wastewater, aquaculture wastewater and landfill leachate. ) To remove the contaminants from the wastewater in a three step process.

In primary treatment, screening is used to filter out relatively large contaminants in the wastewater into screens with holes of uniform size, and sedimentation to separate contaminants heavier than water by gravity. By applying the unit operation of, the floating and sedimentary contaminants contained in the waste water are firstly removed.

In the secondary treatment, various chemicals such as flocculants, adsorbents, and fungicides are used to agglomerate and sediment or adsorb suspended solids, and to kill pathogens. Biological unit processes, such as conversion to or flocculation with suspended solids, are used to remove organic matter contained in wastewater.

The tertiary treatment (or advanced treatment) is a combination of many of the unit operations and unit processes mentioned earlier in the primary and secondary treatments, and ammonia, nitrogen and phosphorus are not easily removed in the primary and secondary treatments. Remove various inorganic materials including heavy metals and synthetic organics

The general wastewater treatment method includes a process for removing various suspended matters such as organic matter, and the separation and removal of these suspended matters is sedimentation separation and flotation separation according to the physicochemical characteristics (eg, size, density, surface charge, etc.) of the suspended matter. And the like selectively.

In the sedimentation separation, a flocculant is mixed in water, mixed, and agitated to form agglomerates. The precipitate is adsorbed and precipitated. Particles heavier than water are precipitated in stagnant water or extremely slow water to separate from water. That's the way.

The flotation separation refers to a phenomenon in which air is attached to the suspended phase dispersed in the dispersion medium to float to the limit surface where the dispersion medium is in contact with the air, and the specific gravity of the suspension is smaller than water or a small bubble is attached to the suspension to reduce the specific gravity. It is a method of separating from water by stopping on the surface of the water.

However, when the suspended solids are removed by sedimentation as described above, there is a problem in that odors, algae, oils and greases, synthetic detergents, iron and magnesium, etc. contained in the wastewater cannot be efficiently removed.

In addition, the sediment is separated from the water by sedimentation in stagnant water or extremely slow water, and wastewater treatment takes a long time, and it is necessary to install a sedimentation basin that separates particles by flowing into a large tank so that water flows slowly. There is a problem that the installation cost increases.

The present invention has been made in view of the above-described problems, the purpose of which is to more effectively collect the organic pollutants and volatile organic pollutants contained in the drainage discharged from factories, businesses, homes, etc. in connection with sedimentation separation and flotation separation It is to remove with.

Another object is to efficiently remove odors, algae, oils and greases, synthetic detergents, iron and magnesium that are not removed by sedimentation.

Another aim is to reduce the cost of treating wastewater by minimizing the installation area of the treatment plant and efficiently reducing the wastewater treatment time.

1 is a block diagram illustrating a high concentration organic wastewater treatment system in which pressure flotation and flocculation sedimentation are linked according to an embodiment of the present invention.

Figure 2 is a flow chart illustrating a high concentration organic wastewater treatment method in conjunction with pressure flotation separation and flocculation sedimentation separation according to an embodiment of the present invention.

* Description of the symbols for the main parts of the drawings *

10: flotation tank 11: auxiliary tank

12 main tank 13 sludge con

14: Scoop 15: Settled sump

20: scum removing unit 21: spiral scoop (Spiral scoop)

22: carriage 30: water level control unit

40: pressure pump 50: bubble generation unit

60: air compressor 70: air regulator

80: friction valve 90: automatic valve

100: raw water pipe 110: treated water pipe

120: first circulation piping 130: second circulation piping

140: first discharge pipe 150: second discharge pipe

160: air piping

The configuration of the present invention for achieving the above object is made as follows.

Floating tank that mixes raw water and air bubbles to float contaminants contained in the raw water to the surface or settles to the bottom and separates contaminants contained in the raw water from water,

A scum removing unit formed at an upper portion of the floating tank and driven by a carriage to rotate the center of the floating tank to a starting point to remove a scum floating on the water surface;

Water level control to adjust the water level so that the scum floating on the surface of the flotation tank can be removed by the scum removal unit by adjusting the amount of treated water discharged through the treated water pipe by opening and closing the treated water pipe connected to the lower portion of the floatation tank Wealth,

A pressure pump for pressurizing a portion of the treated water discharged through the treated water pipe to circulate to the first circulation pipe;

The pressure of the pressure pump is mixed with the return water and the air passing through the nozzle at a constant pressure to the treated water circulated through the first circulation pipe to generate bubbles

A bubble generating part for injecting the bubble through the friction valve connected to the second circulation pipe and spraying the bubble into the auxiliary tank of the floating tank;

An air compressor for generating a predetermined amount of air supplied through an air pipe connected to the bubble generator;

It is characterized in that it is connected between the air pipe is made of an air regulator for maintaining a constant pressure of the air supplied to the bubble generator in the air compressor.

The flotation tank agglomerates raw water flowing from the outside, and attaches bubbles to the floc formed by agglomeration of the raw water, and moves the raw water to the auxiliary tank to float the flocks attached to the bubbles to the surface of the scum. And a sludge cone formed at a central portion of the auxiliary tank to collect flocs which are not raised to the surface due to a high specific gravity, and a bubble formed at the bottom of the main tank; Rotate to include a sump sump to collect the settled sludge.

Another configuration of the present invention for achieving the above object is made as follows.

A first step of coalescing raw water that has passed through the mixed paper and floc forming paper by rotating the auxiliary tank of the flotation tank;

A second step of adjusting the level of the floating tank so that the scum floating on the surface of the floating tank can be removed by the bubble removing unit;

A third step of mixing the water introduced into the inside or a part of the treated water circulated with the conveyed water passing through the nozzle and the air supplied from the air compressor at a predetermined pressure to generate fine bubbles;

A fourth step of injecting the bubbles generated in the third step through the friction valve connected to the second circulation pipe and into the auxiliary tank of the floating tank;

A fifth step of floating the scum with bubbles attached to the floc in the course of moving the raw water through the auxiliary tank to the main tank;

A sixth step of rotating the two wings of the spiral scoop of the scum removing unit to remove the scum floating on the surface of the floating tank through the sludge cone of the floating tank;

A seventh step of forming sludge by depositing flocs having a high specific gravity among the flocs included in the win water to the bottom of the main tank;

An eighth step of collecting the sludge by rotating a small scoop of a servo sump and removing the sludge through a second discharge pipe by opening an automatic valve after a predetermined time elapses;

A ninth step of discharging a predetermined amount of treated water through the treated water pipe according to the level control of the level controller;

And a tenth step of circulating through the first circulation pipe connected to the treatment water pipe by pressurizing a portion of the treatment water discharged through the treatment water pipe with a pressure pump.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a block diagram illustrating a high concentration organic wastewater treatment system in which pressure flotation and flocculation sedimentation are linked according to an embodiment of the present invention.

Figure 2 is a flow chart illustrating a high concentration organic wastewater treatment method in conjunction with pressure flotation separation and flocculation sedimentation separation according to an embodiment of the present invention.

Referring to Figure 1, the high concentration organic wastewater treatment system in conjunction with the pressure flotation separation and flocculation sedimentation of the present invention is a flotation tank (10) to float or settle the contaminants contained in the raw water, and the flotation tank (10) Scum removal unit 20 for removing the contaminants injured in the water surface of the water), the water level control unit 30 for adjusting the water level of the floating tank 10, and the treated water flowing out of the water level control unit 30 Pressure pump 40 for circulating a part of the air, Bubble generation unit 50 for injecting bubbles (bubble) into the inside of the floating tank 10, and injecting air (Air) to the bubble generation unit 50 Air compressor 60, an air regulator 70 for maintaining a constant pressure of air generated in the air compressor 60, a plurality of valves 80 and 90 for opening and closing the flow of raw water, and It consists of a plurality of pipes (100, 110, 120, 130, 140, 150, 160) to be a movement path.

Floating tank 10 is mixed with the raw water and air bubbles passing through the mixed paper and floc forming paper to float the contaminants contained in the raw water to the water surface or settle to the bottom floor contaminants contained in the raw water Is separated from water.

The flotation tank 10 aggregates raw water flowing from the outside, and attaches bubbles to the floc formed by flocculation of the raw water, and moves the raw water to the auxiliary tank 11 to attach to the bubbles. Floating the floc to the surface to form a scum (cum), the specific gravity is large and formed in the center of the secondary tank (11) to precipitate flocs that did not rise to the surface and floated to the surface Sludge Con 13 collecting bubbles and a small scoop 14 formed in the lower portion of the main tank 12 to rotate a settled sump for collecting sludge deposited. To form.

The scum removing unit 20 is a spiral scoop 21 for removing the scum accumulated on the surface of the floating tank 10 by rotating both wings of a scoop shape, and the amount of the spiral scoop 21. A carriage 22 is formed to rotate the wings about the center of the floating tank 10.

The water level control unit 30 may be removed by the scum removal unit 20 by scum floating on the surface of the floating tank 10 by blocking the flow of purified water from the floating tank (10) or blocked. Adjust the water level of the floating tank 10 so that.

The pressure pump 40 pressurizes the treated water discharged by the water level control unit 30 to circulate.

For example, the amount of water circulated by the pressure pump 40 is preferably determined within 10 to 40% of the treated water depending on the waste water phase.

The bubble generating unit 50 mixes the return water passing through the nozzle at a constant pressure with the treated water circulated by the pressure pump 40 and air to flow into the auxiliary tank 11 of the floating tank 10. Creates bubbles that become visible.

The air compressor 60 generates a predetermined amount of air and supplies the air to the bubble generator 50.

The air regulator 70 is connected between the bubble generator 50 and the air compressor 60 to maintain a constant pressure of the air flowing into the bubble generator 50 from the air compressor 60.

The plurality of valves 80 and 90 constantly adjust the pressure in the bubble generating unit 50, and pass bubbles generated by the bubble generating unit 50 to generate fine bubbles once more by friction, thereby causing the floating. A friction valve 80 for dispersing the inside of the auxiliary tank 11 of the tank 10 and an automatic valve 90 for discharging the sludge deposited on the bottom bottom of the main tank 12 of the floating tank 10 to the outside. )

A plurality of pipes (100, 110, 120, 130, 140, 150, 160) is connected to the raw water pipe 100 for introducing raw water into the flotation tank 10, and the water level control unit 30 is the flotation tank The treated water pipe 110 for discharging the treated water treated at 10 to the outside and the treated water discharged through the treated water pipe 110 connected to the pressure pump 40 to generate the bubble 50. The first circulation pipe 120 to circulate to the second circulation pipe, and the second circulation pipe 130 is connected to the friction valve 80 to introduce bubbles generated in the bubble generating unit 50 into the floating tank 10. ), A first discharge pipe 140 connected to one lower side of the floating tank 10 to discharge the scum introduced into the sludge cone 13 to the outside, and the floating tank connected to the automatic valve 90 10) the second discharge pipe 150 for discharging the sludge precipitated on the lower floor to the outside, and the air compressor 60 is connected to the inside of the bubble generator 60 It consists of the air pipe 160 for introducing the air.

The wastewater treatment method of the high concentration organic wastewater treatment system in conjunction with the pressure flotation separation and the coagulation sedimentation separation of the present invention made as described above is as follows.

First, in order to purify raw water passing through mixed paper and floc forming paper into which various chemicals are introduced, the floating tank 10 carries the raw water introduced through the raw water pipe 100 into the auxiliary tank 11 of the floating tank 10. Aggregate by rotating (S11).

Subsequently, the water level control unit 30 leaks raw water introduced into the floating tank 10 to the outside so that the scum floating on the surface of the floating tank 10 can be removed by the bubble removing unit 20. Blocking to prevent the water level is adjusted (S12).

At this time, the bubble generating unit 50 passes through the nozzle at a constant pressure to the water introduced into the inside or a part of the treated water circulated in S20 to be described later, and supplies the treated water passed through the nozzle from the air compressor (60). The air bubbles are mixed with each other to generate fine bubbles (S13), and the fine bubbles pass through the friction valve 80 connected to the second circulation pipe 130, and the fine bubbles pass through the friction valve 80. Spray into the auxiliary tank 11 of the floating tank 10 (S14).

Subsequently, the microbubbles injected into the auxiliary tank 11 of the floating tank 10 are attached to the floc included in the raw water to form a scum, and the scum is passed through the auxiliary tank 11 so that the main tank ( In the process of moving to 12) to rise to the surface (S15).

At this time, the scum removing unit 20 drives the carriage 22 to rotate both wings of the spiral scoop 21 from the center of the floating tank 10, and both wings of the spiral scoop 21 rotate. The scum floating on the surface of the floating tank 10 flows into the sludge cone 13 formed at the center of the floating tank 10, and the sludge cone 13 discharges the incoming scum into the discharge pipe 140. It is discharged to the outside through the removal (S16).

Thereafter, among the flocs included in the win water, flocs having a high specific gravity settle to the bottom of the main tank 12 of the floating tank 10 to form sludge (S17).

At this time, the servo sump (15) rotates the small scoop (14) to collect the sludge deposited on the bottom of the flotation tank, and after a predetermined time the automatic valve 90 is opened to the second discharge pipe 150 It is discharged to the outside through the removal (S18).

Subsequently, the treated water purified by the floatation tank 10 is discharged through the treatment water pipe 110 in a predetermined amount according to the water level control of the water level control unit 30 (S19).

Meanwhile, a part of the treated water discharged through the treated water pipe 110 is introduced into the first circulation pipe 120 connected to the treated water pipe 110, and the treated water is supplied to the pressure pump 40. Pressurized and circulated to the bubble generating unit 50 (S20).

As described above, the present invention sprays bubbles generated in the bubble generating unit to the flotation tank in which the raw water is agglomerated to float the scum to the surface, and removes flocs of a certain size which are not injured at the same time for a predetermined time. By doing so, it is possible to more efficiently remove algae, oil and grease, synthetic detergent, iron, magnesium, and the like contained in the raw water aggregated in the flotation tank.

In addition, by treating flotation separation and sedimentation separation in a single flotation tank, it is not necessary to install a sedimentation basin that separates particles by flowing into a wide basin so that water flows slowly, thus reducing the installation area of the treatment plant and treating wastewater. Reduce processing costs

Claims (3)

Floating tank 10 for mixing the raw water and air bubbles to float the contaminants contained in the raw water to the water surface or settle to the bottom bottom to separate the contaminants contained in the raw water from the water; The scum removal part which removes the scum which floated in the water surface by rotating the spiral scoop 21 which is formed in the upper part of the floating tank 10, and is driven by the carriage 22 to the center of the floating tank 10 as a starting point. 20; By opening and closing the treatment water pipe 110 connected to the lower portion of the floating tank 10, the scum floating on the surface of the floating tank 10 by adjusting the amount of treated water discharged through the treated water pipe 110 is A water level adjusting unit 30 for adjusting the water level to be removed by the scum removing unit 20; A pressure pump 40 for pressurizing a portion of the treated water discharged through the treated water pipe 110 to be circulated to the first circulation pipe 120; The pressurized water of the pressure pump 40 mixes the treated water circulated through the first circulation pipe 120 with the nozzle at a constant pressure and air to generate air bubbles, and generates bubbles. A bubble generating unit (50) which passes through the friction valve (80) connected to the circulation pipe (130) and injects into the auxiliary tank (11) of the floating tank (10); An air compressor (60) for generating a predetermined amount of air supplied through the air pipe (160) connected to the bubble generator (50); Pressurized float separation and coagulation, characterized in that consisting of an air regulator 70 is connected between the air pipe 160 to maintain a constant pressure of the air supplied from the air compressor 60 to the bubble generator 50 High concentration organic wastewater treatment system with sedimentation separation. The auxiliary tank (10) according to claim 1, wherein the floating tank (10) agglomerates raw water introduced from the outside, and attaches bubbles to the floc formed by the agglomeration of the raw water, and supplies the raw water to the auxiliary tank (11). Scum is formed by moving the floc attached to the bubble to the surface to form a scum, and formed in the center of the main tank 12 and the auxiliary tank 11 which settles the floc that has not risen to the surface due to its specific gravity. And a sludge cone 13 for collecting bubbles floating on the water surface, and a servo sump 15 for collecting sludge deposited by rotating the small scoop 14 formed in the lower portion of the main tank 12. High concentration organic wastewater treatment system in conjunction with pressure flotation separation and flocculation sedimentation. A first step of coagulating raw water that has passed through the mixed paper and floc forming paper by rotating the auxiliary tank 11 of the floating tank 10; A second step of adjusting the level of the floating tank 10 so that the scum floating on the surface of the floating tank 10 can be removed by the bubble removing unit 20; A third step of mixing the water introduced into the inside or a part of the treated water circulated with the conveyed water passing through the nozzle and the air supplied from the air compressor 60 to generate fine bubbles; A fourth step of spraying the bubbles generated in the third step through the friction valve 80 connected to the second circulation pipe 130 into the auxiliary tank 11 of the floating tank 10; A fifth step of floating the scum with bubbles attached to the floc in the course of moving the raw water through the auxiliary tank 11 of the floating tank 10 to the main tank 12; Sixth to remove the scum that floated on the surface of the floating tank 10 to the outside through the sludge cone 13 of the floating tank 10 by rotating both blades of the spiral scoop 21 of the scum removing unit 20. Steps; A seventh step of forming sludge by depositing flocs having a high specific gravity among the flocs included in the win water to the bottom of the main tank; Eighth step of collecting the sludge by rotating the small scoop 14 of the servo sump (15), and after a certain time has passed the automatic valve 90 to remove the sludge through the second discharge pipe 150 and ; A ninth step of discharging a predetermined amount of treated water through the treated water pipe 110 according to the level control of the water level adjusting unit 30; Pressurizing a portion of the treated water discharged through the treated water pipe 110 with a pressure pump 40 to circulate through the first circulation pipe 120 connected to the treated water pipe 110; High concentration organic wastewater treatment method in conjunction with pressure flotation separation and flocculation sedimentation.