KR19990013190U - Foam floating type wastewater treatment device - Google Patents

Abstract

It is an object of the present invention to provide a wastewater treatment apparatus having a simple structure and high purification efficiency by supplementing the disadvantages of the air flotation method and the pressure flotation method.

The present invention to achieve the above object is

A reaction tank comprising a bottom surface of a regular hexagon, an inclined surface extending upwardly to form an inclination angle of 140 ° to 160 ° with the bottom surface, and a vertical wall surface vertically inserted from an end of the inclined surface to form a regular hexagon;

An agitator for stirring the wastewater and the treatment chemical flowing into the reactor at a high speed at 600 rpm to 5000 rpm;

An agglomeration tank integrally formed to share one side wall surface of the reaction tank, and incorporating a polymer coagulant into the wastewater introduced from the stirrer and mixing the mixture;

A wastewater moving window formed on an upper side of a common wall surface of the reaction tank and the coagulation tank;

A propeller provided on the wastewater moving window and rotating by the flow energy of the medicine and the stirred wastewater passing through the window to the coagulation tank through a high speed stirrer to form a vortex;

A single body is formed with the reaction tank and the flocculation tank, and the flocculated scum in the wastewater flowing from the flocculation tank through the inclined surface for blocking the flow is floated and separated into a scum separator by the scum removal device, and the purified downstream treated water is discharged. Characterized in that it comprises a levitation to discharge through.

Description

Foam floating type wastewater treatment device

The present invention relates to a wastewater treatment apparatus for purifying wastewater by foam flotation.

Conventionally, the following various techniques have been used as a flotation separation method in which sludge in wastewater is flocculated to purify wastewater.

First, the compressed air is injected into the flotation tank through the diffuser to float the aggregate particles on the surface of the water (diffusion injury), or bubbles are generated through the stirrer rotating at high speed, and the bubbles are floated on the main wall of the aggregate (foam injury). ), Air is sucked into the liquid by forcibly moving water to the disperser hole using a rotary dispersion mechanism, and air is sucked into the liquid, and air bubbles are attached (floating air induction) by attaching fine bubbles to the aggregate. ,

Secondly, it is a pressurized flotation method called so-called dissolved air flotation method. This method is a non-circulating full press method and a circulating partial press method according to the pressurization method. The principle is to supersaturate waste water by putting it in a pressure tank together with air, Since it flows out and is exposed to atmospheric pressure, it is a method of floating the solids by generating fine bubbles around the solids and liquid particles by decompression.

Third, if the waste water is aerated and saturated with air and then injected into a closed tank that maintains a vacuum state, a vacuum floatation method is used in which bubbles are generated in the water due to the pressure drop and bubbles generated rise to raise floating materials in the waste water. have.

Fourthly, if a plurality of aluminum electrode plates are installed in the waste water, and a direct current voltage is applied, there is an electrolytic levitation method in which water is delivered and oxygen bubbles and hydrogen bubbles are generated, and aluminum hydroxide is generated from the aluminum electrode. Since the flotation force is strong, separation due to high efficiency sludge flotation occurs.

However, air flotation, vacuum flotation, electrolytic flotation, and the like are rarely used due to technical problems, installation costs, operating costs, and treatment efficiency. Is being used.

However, the pressurization method is subjected to the treatment of the reaction tank 30, the coagulation tank 31, the pressure pump 32, the pressure tank 33, the floating tank 34, as shown in FIG. 30) and the coagulation tank 31 is used to install a partition on one structure, and the other structures and machines are separated from each other and various piping equipment (35, 36, 37, 38) for connecting them is required. Therefore, it is pointed out that a lot of site is required, installation cost and power cost are high, and it is generally difficult to operate because it has to adjust the appropriate pressure and the liquid-gas mixing ratio.

In addition, the foam flotation method has not been practically used because floc (Floc) has a weak cohesion and bubbles are easily detached from the floc, resulting in low floating efficiency.

The present invention has been proposed in view of the above problems, and its object is to provide a wastewater treatment apparatus having a simple structure and high purification efficiency by supplementing the disadvantages of the air flotation method and the pressure flotation method.

The present invention to achieve the above object

A reaction tank comprising a bottom surface of a regular hexagon, an inclined surface extending upwardly to form an inclination angle of 140 ° to 160 ° with the bottom surface, and a vertical wall surface vertically inserted from an end of the inclined surface to form a regular hexagon;

An agitator for stirring the wastewater and the treatment chemical flowing into the reactor at a high speed at 600 rpm to 3600 rpm;

An agglomeration tank integrally formed to share one side wall surface of the reaction tank, and incorporating a polymer coagulant into the wastewater introduced from the stirrer and mixing the mixture;

A wastewater moving window formed on an upper side of a common wall surface of the reaction tank and the coagulation tank;

A propeller provided on the wastewater moving window and rotating by the flow energy of the medicine and the stirred wastewater passing through the window to the coagulation tank through a high speed stirrer to form a vortex;

A single body is formed with the reaction tank and the flocculation tank, and the flocculated scum in the wastewater flowing from the flocculation tank through the inclined surface for blocking the flow is floated and separated into a scum separator by the scum removal device, and the purified downstream treated water is discharged. Characterized in that it comprises a levitation to discharge through.

1 is a view showing an embodiment of a wastewater treatment apparatus according to the present invention

2 is a plan view of the reactor of the in-phase embodiment

3 is a perspective view of a reaction tank of an in-phase embodiment

4 is a view showing the main shape of the common wall surface of the reaction tank and the coagulation tank according to the present invention

5 is a view showing a modified embodiment in which the reactor of the present invention is installed in series

6 is a view showing an embodiment in which the reactor of the present invention is installed in parallel

7 is a prior art

※ Explanation of code for main part of drawing

1: reactor 2: bottom

3: inclined surface 4: vertical wall surface

5: motor 6: rotor blade

7 agitator 8 flocculation tank

9: wastewater transfer window 10: propeller

12: flotation tank 13: flocculation wastewater discharge window

14: velocity cut slope 15: scum removing device

16: scum return container 17: scum outlet

18: wear 19: outlet

Hereinafter, with reference to the accompanying drawings the configuration and operation of the present invention.

In Fig. 1, a reactor 1 for stirring the waste water to be purified and a treatment chemical (for example, aluminum sulfate) is indicated by reference numeral 1.

The shape of the reactor according to the present invention is fundamentally different from the conventional cylindrical or rectangular cylinder shape in that its flat cross section forms a hexagon.

The bottom surface 2 of the reaction tank 1 forms a regular hexagon, and an inclined surface 3 extending upwardly to form an inclination angle of 140 ° to 160 °, more preferably 150 ° from the bottom surface 2 thereof. At the end of the inclined surface 3, six vertical wall surfaces 4, which are rectangular plate members, are vertically placed so as to form a regular hexagon, and the angle formed with the inclined surface 3 is preferably 110 to 130 degrees. It is optimal that the inner angle formed by the inclined surface 3 and the vertical wall surface 4 is 120 degrees when the inner angle between the bottom surface 2 and the inclined surface 3 is 150 degrees.

Since the planar shape of the reactor 1 is a regular hexagon, the inner angle between each adjacent vertical wall surface is 120 °.

In the reactor 1, a stirrer 7 composed of a motor 5 and a rotary blade 6 rotating by the motor is provided, and the rotary blade 6 of the stirrer 7 is 600 rpm to 5000 rpm. Rotates at high speed.

When the size of the rotary blade 6 of the stirrer 7 is too small or large, the stirring efficiency is lowered. To This is suitable, the three wings will reduce the cost of power while generating a fine bubble.

The box-shaped agglomeration tank 8 is integrally formed so as to share one vertical wall surface 4 of the reaction tank 1, and is located upstream of the vertical wall surface 4a shared by the reaction tank 1 and the agglomeration tank 8. A wastewater moving window 9 is formed, and the window 9 is provided with a propeller 10 having four wings.

The propeller 10 is rotated by the flow energy at the time when the waste water treatment chemicals and the stirred waste water passes through the window 9 and passes through the window 9 to the coagulation tank 8 due to the vortex and the flow rate occurring in the reaction tank 1, When the propeller 10 rotates, the wastewater falling into the coagulation tank 8 and the polymer flocculant 11 introduced from the top are mixed evenly while forming a vortex, causing a strong reaction to agglomerate foreign matter in the wastewater.

Wastewater in the coagulation tank (8) is moved to the reaction tank (11) and flotation tank (12) forming a single body with the coagulation tank (8), for this purpose, the coagulation wastewater discharge window (13) formed in the coagulation tank (8) Through the flow rate inclined surface 14 through the flow at a constant flow rate flows into the flotation tank 12, the aggregated sludge (Scum) is floated to the upper portion of the flotation tank (12).

The scum that floated on the surface of the water is recovered by the scum removal device 15 to the scum return container 16 and discharged through the scum discharge port 17 to be separately processed. 19) discharged to sewers.

The operation of the present invention will be described in more detail below.

Unlike the conventional apparatus, which was driven at 200 rpm or less to achieve the optimum efficiency of the stirrer, the stirrer 7 of the present invention is rotated at a high speed of 600 rpm to 5000 rpm.

As a result, the swirling wastewater soars from the bottom surface (2) to the inclined surface (3) and the vertical wall surface (4) and at the same time rotates along the hexagonal surface formed by each vertical wall surface (4), causing strong agitation with the introduced wastewater treatment chemicals. do.

This is due to the shape of the reactor 1 and the high-speed rotation of the stirrer 7. In the case of the conventional cylindrical wall, the stirring rotation speed is low and there is no resistance during the fluid rotation, so the stirring efficiency is lowered. As it achieves 90 °, it is difficult to rotate the waste water smoothly due to the rotation of the stirrer, and the load is large because the resistance is large. Therefore, the high rotation is difficult and the stirring efficiency is also low. In particular, the force of the waste water rising from the bottom to the top along the guide of the wall is extremely small On the other hand, in the present invention, a strong centrifugal force acts on the wastewater by the high speed rotation of the stirrer 7, and the wastewater rises from the hexagonal bottom surface 2 along the guide of the inclined surface 3 and the vertical wall surface 4. As the water surface rises (the waste water surface forms a parabola), a cavity is formed in the center of the reactor 1 and the waste water swirls up and down about the cavity. Strong whirlwinds form and introduce many bubbles into the wastewater.

On the other hand, the wastewater swirling up and down simultaneously rotates in the circumferential direction and causes collision at the corners of the vertical wall surface 4 which forms an angle of 120 ° to each other, thereby greatly improving agitation efficiency, and this corner portion has an internal angle of 120 °. Unlike tetrahedrons, it does not act as a large resistance to the vortex formation of wastewater. According to the repeated experiments of the present inventors, the four-sided cylinder is too large in resistance and difficult to rotate smoothly, and it is difficult to cause cavitation, and the octagonal cylinder is close to the cylinder, and the stirring efficiency decreases. It was found that forming with a cylinder was optimal.

As such, the present invention can significantly reduce the input amount of the chemicals by mixing the waste water treatment chemicals and the waste water, and at the same time, since many bubbles are mixed in the waste water flow, it is not necessary to provide a separate bubble generator for mixing the bubbles. Do.

The agitated wastewater is transferred to the coagulation tank 8 through the window 9 on the upstream side by a force rising up the vertical wall surface 4 with a strong centrifugal force, and by the vortex and the flow velocity formed in the reaction tank 1, the propeller 10 will rotate.

The wastewater dropped into the coagulation tank 8 by the propeller 10 rotates to fall in a vortex state, and at the same time, it collides with a polymer flocculant (which is a wastewater treatment agent normally added together with the wastewater treatment chemicals) dropped in from the top to prevent turbulence. Since it is mixed evenly while forming, it is not necessary to install a separate stirrer unlike the conventional, so the structure is greatly simplified and no need for separate power.

The wastewater reacted with the polymer coagulant is moved to the floating tank 12 formed as a single body through the coagulated wastewater discharge window 13 on the downstream side and is floated at a constant flow rate through the flow-blocking slope 14 on the way. .

Impurities in the wastewater treatment agent, the polymer coagulant, and the stirred wastewater are agglomerated, and the bubbles mixed through the agitation process in the reaction tank 1 adhere to the agglomerated scum surface to increase buoyancy, so that they can be quickly moved to the surface of the water. You will be injured.

The scum floated on the water surface is scratched by the scraper 23 mounted on the chain 22 which is rotated by driving the motor 21 of the scum removal device 15, and the scum scrubber provided at the upper end of the rear side of the flotation 12 ( 16) are collected.

The purified wastewater is discharged to the sewer through the ware 18 and the discharge port 19, and the sludge collected in the scum collection container 16 is drawn out to the outside of the flotation tank 12 through the scum discharge port 17, so that separate waste treatment regulations Will be processed according to.

Reference numeral 20 here is a cleaning outlet.

In the embodiment of FIG. 1, one hexagonal reactor 1 is installed, but a plurality of reactors 1a and 1b are installed in series as shown in FIG. 5 or two reactors as shown in FIG. It is also possible to provide 1c) (1d) in parallel.

Table 1 shows the test results of the wastewater treatment efficiency by the conventional pressure flotation device and the device of the present invention.

Wastewater Treatment Efficiency Comparison Table Processing efficiency division SS (mg / l) COD (mg / L) Remarks Wastewater (Jeans and Wastewater) 196 179.1 Conventional pressure floating method Concentration 26 77.6 Installation area 32㎡, pressure pump, pressure tank, pressure piping, connection piping required Removal efficiency (%) 86.7 56.6 Security device Concentration 24 77.6 Installation area 6㎡, no need for pressurized pump, pressurized tank, pressurized piping and connecting piping Removal efficiency (%) 87.7 56.6

As a result of the test in Table 1, the processing efficiency is similar to that of the conventional pressurization method, but the installation area is small and the structure is simple, so that the installation cost is greatly lowered.

According to the present invention as described above, since the reaction tank, the flocculation tank and the floating tank are formed in a single body, various piping for connecting each treatment tank is unnecessary and very compact, requiring a small installation space, and in particular, the reaction tank is a hexagonal bottom surface and an inclined surface. And a vertical wall, and the stirrer is a high-speed rotation method, and as the centrifugal force acts on the wastewater by the rotation, the wastewater rises along the inner wall of the reactor and rotates along the hexagonal wall, resulting in strong agitation. Strong whirlwind flows through the cavity to form air bubbles into the waste water naturally, and the vortex and flow rate rotates the propeller to introduce the waste water into the coagulation tank, resulting in strong stirring with the polymer coagulant. Bubble generator for stirring Since the stirring device is unnecessary, the installation cost is greatly reduced.

Claims (2)

A reaction tank comprising a bottom surface of a regular hexagon, an inclined surface extending upwardly to form an inclination angle of 140 ° to 160 ° with the bottom surface, and a vertical wall surface vertically inserted from an end of the inclined surface to form a regular hexagon; An agitator for stirring the wastewater and the treatment chemical flowing into the reactor at a high speed at 600 rpm to 5000 rpm; An agglomeration tank integrally formed to share one side wall surface of the reaction tank, and incorporating a polymer coagulant into the wastewater introduced from the stirrer and mixing the mixture; A wastewater moving window formed on an upper side of a common wall surface of the reaction tank and the coagulation tank; A propeller provided on the wastewater moving window and rotating by the flow energy of the medicine and the stirred wastewater passing through the window to the coagulation tank through a high speed stirrer to form a vortex; A single body is formed with the reaction tank and the flocculation tank, and the flocculated scum in the wastewater flowing from the flocculation tank through the inclined surface for blocking the flow is floated and separated into a scum separator by the scum removal device, and the purified downstream treated water is discharged. Waste water treatment apparatus, characterized in that configured to include a flotation discharged through. The method of claim 1, And said reactor is provided with a plurality of connected in series or in parallel.