KR20060009455A - Dissolved airfloatation system for treatment waste water - Google Patents

Abstract

The present invention relates to a pressurized float tank for wastewater treatment, which is capable of easily removing scum and sediments in wastewater through primary and secondary wastewater, dewatering scum to minimize water content, The present invention relates to a pressurized floating tank for pressurized water.

To this end, the present invention provides a wastewater treatment device comprising: a wastewater inflow line formed on one side of a lower end of a water tank; A treatment water tank integrally attached to the other side of the water tank; A pressurizing line for air injection installed in communication with the wastewater inflow line; An air injection means connected to a rear end of the pressurizing line for air injection; A first diaphragm spaced apart from an inner bottom surface of the water tank at a predetermined interval; A plurality of swash plates disposed along the longitudinal direction of the water tub at an inner central portion of the water bath; A second diaphragm disposed at the center of the swash plate at the same inclination angle and having a lower end extended toward the first diaphragm; A scum removing means installed along the longitudinal direction at an upper center portion of the water tub; And a scum tank integrally formed on one side of the water tank to store the scum removed by the scum removing means.

Pressurized floating tank for wastewater treatment, inclined plate, first diaphragm, second diaphragm, scum, settling

Description

{DISSOLVED AIRFLOWATION SYSTEM FOR TREATMENT WASTE WATER}             

1 is a front view showing a pressurized floating tank for wastewater treatment according to the present invention;

FIG. 2 is a plan view showing a pressurized floating tank for wastewater treatment according to the present invention,

3 is a side view showing a pressurized floating tank for wastewater treatment according to the present invention,

4 and 5 are side views showing another embodiment of a pressurized float tank for wastewater treatment according to the present invention,

6 is a schematic view for explaining a conventional wastewater treatment facility including a pressurized floating tank;

Description of the Related Art

10: Water tank 12: Wastewater inflow line

14: pressure line for air injection 16: treated water tank

18: Process water outlet 20: Water level control device

22: Leg 24: Line type pressurizing tank

26: first diaphragm 28: swash plate

30: second diaphragm 32: scum tank

34: Scum guide plate 36: Dewatering screw

38: roller driving type knitting machine 40: roller

42: Direct network 44: Motor

46: obstruction plate 100: pressurized floating tank

The present invention relates to a pressurized float tank for wastewater treatment, and more particularly, to a method for increasing the settling surface area of wastewater by introducing a plurality of swash plates, minimizing the water content of the scum and reducing the pressure tank line, So that the installation area can be minimized, thereby maximizing the treatment efficiency of wastewater and wastewater.

One of the causes of environmental pollution will be in wastewater generated from polluted river water, waste disposal site, manure disposal site, industrial site wastewater treatment plant, sewage treatment plant,

Various types of wastewater treatment apparatuses have been developed and installed to treat wastewater, and an example thereof is configured as shown in FIG.

The raw water is introduced into the foremost end portion, and a ready-to-feed flow rate adjusting tank for feeding the raw water to the next process is disposed, and a reaction tank and a flocculating tank are arranged beside the raw water adjusting tank.

The reaction tank has a function of regulating the proper flocculation PH range as a process in which Al ₂ (SO ₄ ) ₃ and NaOH are added to the source water to react with contaminants and the organic and inorganic substances are removed and flocculated. It is equipped.

The flocculation tank functions to thicken the micro FLOC (impurity flocculation agglomeration) aggregated in the reaction tank by introducing an organic flocculant into the reaction tank. The agitator included in the flocculation tank mixes the organic and inorganic flocculant into the reagent agglomeration .

The pressurized floatation vessel separates the reacted flocculated FLOC into a water layer and a sludge layer in the flocculation tank, and the pressurized floatation vessel is provided with an important facility to be.

On the other hand, the pressure floating tank is connected to the pressurized floating tank and is supplied with pressurized water. The pressure tank is a component which plays an important role on the sludge portion. The pressure tank generates fine bubbles and allows the fine bubbles to be collected around the flocculated FLOC, Thereby facilitating the separation of solid and liquid.

The treatment water tank is a preparation tank for transferring the treated water subjected to solid-liquid separation in the pressurized floating tank to the next step.

In particular, the surplus sludge separated from the pressurized floating tank is sent to the scum tank. The scum tank temporarily stores the sludge so as to be transferred to the concentration tank.

The concentration tank, the dehydrator, and the cake storage tank are arranged side by side of the scum tank. The concentration tank is a tank for stagnating and concentrating the sludge for a predetermined period of time.

In addition, the dehydrator is a device for reducing the volume by removing moisture from sludge generated in the wastewater treatment process, and the cake storage tank temporarily stores dehydrated cakes.

The pressurized float tank, which is most important in the wastewater treatment apparatus having such an arrangement, will be described in more detail as follows.

Wastewater treatment refers to the removal of foreign substances that are dissolved and particulate in water. It is used to solidify foreign matters by various methods such as chemicals and microorganisms, to separate the solidified foreign matters by physical methods, to separate them into supernatant and sludge Process.

In the physical method of separating the solidified foreign matter during the wastewater treatment process, the dipping method is the most common method. However, this precipitation method has a disadvantage that the site area for the installation of the facility is enormous and the deposited sediment is corroded and becomes waste water again The pressure was developed in consideration of these disadvantages.

The principle of the above pressurization is that the air is dissolved in water under atmospheric pressure and exists as dissolved oxygen. When air is injected in a state where water is put into a container, air is melted more than atmospheric pressure, In the water.

In this state, when the pressure is lowered to the atmospheric pressure, the air existing in the molecular state in water is released again to the atmosphere.

For example, if you turn the faucet off as a pressurized water, a white, milky tap water comes out, because the air is in a molecular state in the water.

At this time, the fine air of the pressurized water and the coagulated sludge are entangled and the sludge has buoyancy, floating on the water, and removing the floated sludge.

In addition, the principle of the pressurized flotation tank is to dissolve air in the wastewater to be treated under pressure, and when the air is released to the atmosphere, the air dissolved in the wastewater becomes a large number of fine bubbles, It is attached to the periphery of the material to reduce the specific gravity of the float, which eventually floats on the water and is removed.

Diffused air flotation (DAF), cavitation air flotation (CAF), air flotation, vacuum flotation, and the like are examples of conventional pressurized flotation vessels. have.

The dissolved air flotation method is divided into a pre-pressurizing method and a partial pressurizing method. The pre-pressurizing method floats the entire wastewater. The partial pressurizing method floats the sludge by circulating only a part of the treated water. The principle of both of them is a principle of injecting outside air using an air compressor or an ejector, and at the same time, generating pressurized water to float the sludge.

The induction air flotation method uses treated water of raw wastewater as the pressurized water, and an anionic detergent is injected and treated in order to increase the bubble generation by modifying the circulation pressure type.

The air floating method is a method using an air blower and an air diffuser, and is a method in which air is forcedly injected into wastewater to float fine air and particulate matter at the same time.

When the wastewater is injected into a vacuum space, the supersaturated air bubbles are eluted and attached to the particulate matter to float the particulate matter.

Since the conventional pressurized floatation vessels are used many times, they are easy to be managed and various kinds of mediators are used to generate minute bubbles. However, there is an advantage that minute bubbles are easily generated. However, when the sedimentation sludge is removed, There is a problem in that the detergent is injected in order to increase the efficiency of floatation, so that the operation cost is high and foam is generated in the treated water due to the introduction of the detergent.

Particularly, the existing pressurized floating vessels are disadvantageous in that the sludge is not floated due to the occurrence of air bubbles and the sludge precipitated is high, and the unused area of the internal space is wide, so that the floating force of the sludge is weakened.

In addition, existing pressurized floating vessels occupy a large area of installation site, which is disadvantageous in that installation cost is high.

The present invention has been developed in view of the above-mentioned disadvantages, and it is an object of the present invention to provide a line type pressurizing tank for supplying air in the air naturally by the rotational force of a pump, A scum dehydrator is installed on the upper part so as to reduce the water content of the scum, and a squeeze dehydrator is installed on the upper part in order to increase the floating force of the sludge, and at the same time, The purpose is to provide the group.

According to an aspect of the present invention, there is provided a pressurized floating tank for wastewater treatment, comprising: a water tank having a predetermined volume; A wastewater inflow line formed on one side surface of the lower end of the water tank; A treatment water tank integrally attached to the other side of the water tank; A pressurizing line for air injection installed in communication with the wastewater inflow line; An air injection means connected to a rear end of the pressurizing line for air injection; A first diaphragm spaced apart from an inner bottom surface of the water tank at a predetermined interval; A plurality of swash plates disposed along the longitudinal direction of the water tub at an inner central portion of the water bath; A second diaphragm disposed at the center of the swash plate at the same inclination angle and having a lower end extended toward the first diaphragm; A scum removing means installed along the longitudinal direction at an upper center portion of the water tub; And a scum tank integrally formed on one side of the water tank to store the scum removed by the scum removing means.

The lower end of the water tank (middle part from the wastewater inflow line) is formed into a cone shape that widens toward the upper side, and legs supported on the ground are integrally attached to the end of the cone.

A plurality of line-shaped pressurizing tanks installed along a longitudinal direction of the water tub in a space between a lower end portion of the water tub (a conical outer surface) and the legs; And a pressurizing pump connected to the pressurizing tank.

A scum inducing plate installed in the scum removing unit along the longitudinal direction at an upper center portion of the water tank and communicating with the scum tank at one end; A dewatering screw installed along the lengthwise direction of the water tray directly above the scum induction plate; And a roller driving type knitting net provided with the dewatering screw interposed therebetween.

And a water level regulating device is further installed in the treated water outlet formed at one side of the water tank so as to be vertically bent upward and to be located in the treated water tank.

And an interference plate for guiding the flow of the scum to the central side (the straight mesh side) is integrally attached to the upper inner surface of the water tub.

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

Fig. 1 is a front view showing a pressurized floating tank for wastewater treatment according to the present invention, Fig. 2 is a plan view, and Fig. 3 is a side view.

The pressurized floatation tank according to the present invention is intended to maximize the treatment efficiency of wastewater and maximize the installation area by minimizing the water content of scum while increasing the settling surface area of wastewater.

The water tank 10 employed in the pressurized floating type water tank 100 of the present invention is formed in a shape that can minimize the installation area and is formed into a conical shape whose lower end portion widens toward the upper side.

A wastewater inflow line 12 into which wastewater flows is formed at a lower side surface of the water tank 10. The wastewater inflow line 12 is connected to the air infusion pressure line 14 in communication.

Further, on the other side of the water tank 10, a process water tank 16, in which the treated water having scum removed and settled is temporarily stored as described later, is integrally formed.

The scum refers to oils, fats, solids, etc. gathered by floatation from the surface of a sedimentation tank, a sludge storage tank, a digestion tank, etc., and the sediment means that suspended matter in water is sedimented by the action of gravity.

The water level regulating device 20 is vertically bent upward in the process water outlet 18 formed on one side of the water tank 10. The water level regulating device 20 includes a water tank 10, Is a device for regulating the discharge amount of the treated water when changing the inflow amount of the wastewater flowing into the wastewater.

As described above, the lower end of the water tub 10 (the middle portion from the wastewater inflow line) is formed in a cone shape that widens toward the upper side. In the upper end where the cone ends, the legs 22 supported on the ground are integrally formed Respectively.

Particularly, the air injection means is connected to the rear end of the air injection pressurizing line 14, and the air injection means is connected to the lower end of one side (conical outer surface) of the water tub 10, A plurality of line-type pressurizing tanks 24 installed in the space between the line pressurizing tanks 24 and a pressurizing pump (not shown) connected to the line pressurizing tanks 24.

At this time, the line-type pressurizing tanks 24 are installed vertically in the vertical direction along the longitudinal direction of the water tank.

On the other hand, as shown in FIGS. 4 to 5, the line-type pressurizing tank 24 is disposed on one side in the space between the lower ends (conical outer surface) of the water tub 10 and the legs 22 5 pieces can be stacked up and down.

By thus inserting the line-type pressurizing tank 24 at the lower end of the water tub 10, the installation area can be minimized.

Here, the first diaphragm 26 is spaced apart from the inner bottom surface (conical surface) of the water tub 10 by a predetermined distance.

In particular, a plurality of swash plates 28 are arranged at regular intervals along the longitudinal direction of the water tub 10 in the inner central portion of the water tub 10 (the upper space at the end of the conical surface).

In the innermost position of the swash plate 28, the lower end of the swash plate 28 is extended to the lower side (the surface side of the first diaphragm) to form a second diaphragm 30, It is possible to prevent scattering and to induce the sediment to be deposited slowly toward the bottom of the water tank 10.

Meanwhile, a scum removing means is provided along the longitudinal direction at the upper center portion of the water tub 10, and the scum removed by the scum removing means is provided on the other side of the water tub 10, And is stored in the scum tank 32 attached thereto.

The scum removing means includes a recessed scum guide plate 34 provided along the longitudinal direction at an upper center portion of the water tank 10 and a scum guide plate 34 disposed along the longitudinal direction of the water tank 10 immediately above the scum guide plate 34. [ A dewatering screw 36 to be installed and a porous roller driving type knitting mesh 38 provided with the dewatering screw 36 interposed therebetween.

More specifically, the one end of the scum induction plate 34 is connected to the scum tank 32 so that the roller-driven type weaving network 38 is connected to the roller 40 of the triangular arrangement And the rollers 40 of the dewatering screw 36 and the roll driving type knitting mesh 38 are connected to the motor 44 to be rotationally driven.

At this time, a blocking plate 46 for guiding the flow of the scum to the central side (the straight mesh side) is integrally attached to the inner surface of the upper end of the water tub 10.

4, the concave scum induction plate 34 is attached along the longitudinal direction of the water tub 10, and the scum removing means is provided above the water tub 10 in the longitudinal direction of the water tub 10 And a roller 40 is attached to the roller 40. The roller 40 is surrounded by a porous sifter 42. [

5, the concave scum induction plate 34 is attached along the longitudinal direction of the water tub 10, and the length of the water tub 10 A pair of roller-driven knitting machines 38 along the direction form a conveyor-like arrangement.

The operation state of the pressurized float tank for wastewater treatment according to the present invention having such a structure will be described as follows.

The wastewater flows into the wastewater inflow line 12 and at the same time the air is pressurized and introduced through the pressurization line 14 for air injection communicated with the wastewater inflow line 12. [

At this time, outside air is filled in the plurality of line-shaped pressurizing tanks 24 by the pressurizing pump, and air is supplied to the pressurizing line for air injection.

Accordingly, the air is dissolved in the wastewater, and the dissolved air rises as a plurality of minute bubbles. The scum is removed along the space between the bottom surface (conical surface) of the water tank 10 and the first diaphragm 26 Means and the upper space of the swash plate.

That is, minute bubbles adhere around the scum (suspended matter) of wastewater, and the weight of the scum is reduced, and the scum floats on the water.

At this time, the first diaphragm 26 constantly guides the flow of the wastewater and slowly decelerates the flow rate, so that the scum containing the bubbles in the water is not broken.

Then, the scum that floated above the water surface flows to the center side (on the side of the straight mesh) as soon as it touches the obstruction plate 46 attached to the inner surface of the upper end of the water tank 10, And then falls to the lower dewatering screw 36. [0050]

Subsequently, the scum is dewatered by the rotation of the dewatering screw 36 so that the water content falls to 97% or less. The dewatered scum is mounted on the lower scum guide plate 34 together with the screw feed force, (32).

The treated water thus separated from the scum passes through the plurality of swash plates 28 and flows downward. At this time, the settling of the treated water in which the scum is first removed is generated on the surface area of the swash plate 28.

That is, the precipitate contained in the treated water sinks downward due to its own weight, and the precipitate easily precipitates on the surface area of the plurality of swash plates 28.

Thus, the scum is firstly removed, and the treated water in which the precipitate is secondarily removed is discharged to the treated water tank 16 through the treated water outlet 18 formed on one side of the water tank 10.

At this time, when the inflow amount of the wastewater flowing into the water tank 10 is changed, the discharge amount of the treated water can be adjusted by adjusting the water level control device 20 of the water tank 10 located in the treatment water tank 16 .

Subsequently, the precipitate that has not been removed from the swash plate 28 is partially submerged in the bottom of the water tank 10, so that the sediment in the guide path of the second diaphragm 30 does not flow but slowly sinks to the bottom.

As described above, the pressurized flotation apparatus of the present invention easily removes scum and sediments present in wastewater and discharges clean treated water.

As described above, the pressurized floating tank for wastewater treatment according to the present invention has the following advantages.

1) Since the first diaphragm gradually reduces the flow rate of the influent water (wastewater + pressurized water), the foreign substances in the wastewater can float slowly together with the bubbles, and the scum floats easily on the surface of the water, .

2) The scum or sediment which has not been removed due to the flow of the flow is stuck to the surface area of a large number of swash plates, and the sediment is removed.                     

That is, after the scum floated firstly, the scum or precipitate is precipitated from the swash plate at the second time, so that the separation effect can be obtained by twice the size of the existing equipment.

3) Conventionally, a scum dehydrator is installed separately, but the cost and installation site can be saved by installing a scum dehydrating screw at the top of the water tank.

4) Due to dehydration action of scum dehydrator, the water content of scum can be lowered to 97% or less (99.5% as of the past).

5) The installation area of the pressurized flotation tank can be minimized by providing a line-type pressurizing tank which is located at the bottom of the water tank, which is conventionally installed on a separate site.

Claims (6)

In the pressurized floating tank for wastewater treatment, A water tank having a predetermined volume; A wastewater inflow line formed on one side surface of the lower end of the water tank; A treatment water tank integrally attached to the other side of the water tank; A pressurizing line for air injection installed in communication with the wastewater inflow line; An air injection means connected to a rear end of the pressurizing line for air injection; A first diaphragm spaced apart from an inner bottom surface of the water tank at a predetermined interval; A plurality of swash plates disposed along the longitudinal direction of the water tub at an inner central portion of the water bath; A second diaphragm disposed at the center of the swash plate at the same inclination angle and having a lower end extended toward the first diaphragm; A scum removing means installed along the longitudinal direction at an upper center portion of the water tub; And a scum tank integrally formed on one side of the water tank for storing the scum removed by the scum removing means. 2. The waste water treatment system according to claim 1, wherein the lower end of the water tank (the middle portion from the wastewater inflow line) is formed in a cone shape that widens toward the upper side, and legs supported on the ground are integrally attached to the end portion of the cone. Pressurized flotation tank. [2] The apparatus according to claim 1, wherein the air injection means comprises: a plurality of line-type pressurization tanks installed along a longitudinal direction of the water tub in a space between a lower end portion (conical outer surface) of the water tub and the leg; And a pressurizing pump connected to the pressurizing tank. The scum removing device according to claim 1, further comprising: a scum induction plate installed along the longitudinal direction at an upper center portion of the water tank to communicate with the scum tank; A dewatering screw installed along the lengthwise direction of the water tub immediately above the scum induction plate; And a roller driving type knitting net provided with the dewatering screw interposed therebetween. The pressurized floating tank for treating wastewater according to claim 1, further comprising a water level adjusting device for vertically bending the water from the process water outlet formed at one side of the water tank and located in the process water tank. The pressurized float tank for treating wastewater according to claim 1, wherein an interference plate for guiding the flow of the scum to the central side (the side of the straight mesh) is integrally attached to the upper inner surface of the water tank.

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