KR20010055004A - Apparatus for removing sludge by floating of sludge in a settling tank - Google Patents

Abstract

PURPOSE: A sludge removing equipment by flotation of sludge in a settling tank is provided, which can agitate primary inorganic coagulant, surfactant and secondary coagulant with wastewater at a second and a fourth agitating devices and spray at high speed into a flotation tank to adhere small flocks to air bubbles generated by surfactant to form large lump. The large flocks float on the water surface in an instant and float continuously, so that the sludge floating on the surface of the water can be easily removed, thus increasing the treatment efficiency of wastewater. CONSTITUTION: The system comprises the followings: (i) a settling system that comprises a sump tank (10), a primary chemical feed device (30), a secondary chemical feed device (70) and a flotation tank (90); (ii) a sump tank (10) to which air is fed through a blower pump (12) for replenishing dissolved oxygen in the wastewater; (iii) a first agitating device (18) that is made of porous plate, to which wastewater is fed by a pump (14) for separating wastewater particles into smaller one; (iv) a second agitating device (50) that is made of spiral coil spring, to which wastewater and treating liquid from a primary chemical feed device (30) are fed for mixing the primary treatment liquid and wastewater; (v) a third agitating device (64) set down stream of the second agitating device (50) for making eddy flow to mix with the secondary treatment liquid from the secondary chemical feed device (70); (vi) a fourth agitating device (60) that is made of spiral coil spring for making eddy flow to mix the wastewater with the secondary treatment liquid from the secondary chemical feed device (70); and (vii) a flotation tank (90) in which wastewater is sprayed through a primary spray nozzle (92) at a high speed into the flotation tank (90).

Description

Sludge removal device by sludge flotation in sedimentation tank {APPARATUS FOR REMOVING SLUDGE BY FLOATING OF SLUDGE IN A SETTLING TANK}

The present invention relates to a sludge removal apparatus in a sludge flotation method of flocculating sludge by increasing the efficiency of flocculation by flocculating harmful substances in the wastewater, and more specifically, to maintain the state of injury by allowing the sludge to float above the surface of the wastewater. Therefore, the present invention relates to a sludge removal apparatus by sludge flotation in an improved sedimentation tank to maximize the sludge removal efficiency and maximize the wastewater treatment capacity compared to the required area of the facility.

In general, the sludge sedimentation method in which a plurality of tanks are provided and waste water passes through each tank and undergoes aeration and sedimentation is widely used.

However, the repeated aeration and sedimentation treatment method of wastewater has a problem that it takes a lot of time (usually 2-3 days) to purify the wastewater, and the large area required for installing the wastewater treatment device is large and the treatment cost is inefficient. .

Therefore, there is an urgent need for an improved sludge removal apparatus capable of maximizing the wastewater treatment capacity relative to the required area of the facility.

The present invention has been proposed in order to solve the conventional problems as described above, the object of which is that by the sludge flotation separation in a high-efficiency sedimentation tank that can treat a large amount of wastewater even if a small area (size) equipment The object is to provide a sludge removal device.

In addition, the present invention, by mixing the cohesive and flocculating chemicals in the waste water to agglomerate with sludge and then naturally large flocculated sludge to rise above the water surface of the waste water to maximize the sludge removal efficiency, so as to continuously maintain the injury state, It is to provide a sludge removal device by separating the sludge in the sedimentation tank by the sludge flotation method that can maximize the wastewater treatment capacity compared to the required area of the facility.

1 is a schematic view showing a sludge removal apparatus in a sedimentation tank according to the present invention as a whole;

Figure 2 is a detailed view of the stirring mechanism provided in the sludge removal apparatus according to the present invention;

Figure 3 is a cross-sectional view of the spray nozzle equipped in the sludge removal apparatus according to the present invention;

Figure 4 is a cross-sectional view of the vortex forming pipe equipped in the sludge removal apparatus in the sedimentation tank according to the present invention;

5 is a plan view of a wastewater injection mechanism provided in the sludge removal apparatus according to the present invention;

6 is an explanatory view showing a wastewater state in which sludge is dispersed as particles in the wastewater in reaction with the primary inorganic flocculant;

7 is an explanatory view showing a wastewater state in which sludge particles adhere to bubbles formed by a surfactant;

FIG. 8 is an explanatory view showing a wastewater state in which a bubble in which sludge particles are stuck after being injected after stirring with a secondary polymer flocculant is agglomerated into a huge mass and floated on the water surface;

9 is a block diagram of a floating pump and a suction pipe provided in the sludge removal apparatus according to the present invention;

10 is a configuration diagram of the floating tank provided in the sludge removal apparatus according to the present invention.

Explanation of symbols on the main parts of the drawings

10 ..... sump 12 ..... blower pump

16 ..... Transfer pipe 30 ..... Primary chemical injection device

45 ..... Stirrer 50,60 .... Stirrer

52 ..... Turning 70 ..... 2nd chemical injection device

90 ..... Floating tank 100 .... Injection mechanism

110 .... Floating Pump

In order to achieve the above object, the present invention, in the sludge removal apparatus of the sludge flotation method of the sludge flotation method of the sludge flotation method to increase the treatment efficiency by injecting wastewater treatment chemicals into the wastewater collected in the collection tank, flocculate the harmful substances in the wastewater. In the rear of the collection tank and the quantitative input device, a spiral stirring mechanism for agitating and mixing wastewater and chemicals is provided, and a plurality of injection mechanisms for injecting the stirred wastewater and chemicals into the sludge floating tank are provided. By providing a sludge removal device by the sludge flotation in the sedimentation tank, characterized in that it comprises a flotation pump for discharging the sludge separated from the flotation to the outside.

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

1 is a view showing the sludge removal apparatus 1 in the settling tank according to the present invention. In the figure, waste water to be purified is collected and stored in the hollow sump tank 10.

In addition, a blower pump 12 is provided to sufficiently replenish the dissolved oxygen amount of the wastewater stored in the sump tank 10 to continuously supply oxygen to the sump wastewater. In addition, the waste water stored in the sump tank 10 is transferred to the first stirring mechanism 18 through the transfer pipe 16 by driving the pump 14 on the outlet side, and the pH amount is measured by the pH sensor 20 during the transfer. To send a signal to the metering pump 22 of the chemical supply device.

In the above, the primary stirring mechanism 18 has a structure of a porous plate mounted in the transfer pipe 16 as shown in FIG. 4 to separate the wastewater particles very small.

It is preferable that the pump 14 for discharging the waste water from the water collecting tank 10 is preliminarily provided with a function of aeration by mixing air to the outside during inhalation and discharge of the wastewater solution.

The first processing solution supply device 30 is connected to the pump 14 and the transfer pipe 16 at the rear end of the first stirring mechanism, and the first processing solution supply device 30 includes a chemical stirring tank 32. Intermediate storage tank 34 and the supply storage tank 36, etc., the chemical stirring tank 32 is interfaced with the water supplied through the water supply pipe 38 and the primary inorganic coagulant supplied from the chemical container 40 The activator is mixed in a predetermined amount to stir by rotating the stirrer 45.

In this case, as the supplied chemical, 50-100 ppm of the primary inorganic flocculant and 100-250 ppm of the surfactant are mixed to make a primary treatment solution. The stirred primary treatment solution is measured by the pH sensor 20 to adjust the pH adjuster. It can be put in.

Then, when the valve 32A is opened, it is stored in the intermediate storage tank 34 and then stored in the supply storage 36 again by the operation of the metering pump 34A and again by the metering pump 21 and the valve 22. Through the connecting pipe 22A, the feed pipe 16 is quantitatively supplied and mixed with the waste water.

Then, the wastewater that has passed through the pH sensor 20 passes through the primary stirring mechanism 18 designed to facilitate vortex formation in the transfer pipe 16 to form a vortex as the transfer pressure of the wastewater increases.

Next, the wastewater mixed with the primary treatment solution is helically transferred to the second stirring mechanism 50 formed of spiral spiral pipes such as three coil springs to generate secondary vortices to maximize the effect of stirring. do.

The reason why the second stirring mechanism 50 for continuously transporting the wastewater by the pump 14 is formed by three spiral pipes such as a spiral coil spring is mainly performed while the wastewater is transported by the complex vortex. It is possible to mix and stir evenly with the solution and to significantly improve the stirring efficiency.

On the other hand, the inner wall of the pipe 2 of the second stirring mechanism 50 is formed in a jagged jagged projection zigzag to disturb the flow while the waste water is transported in a spiral spiral Tumble phenomenon several times than the conventional method To maximize it.

In addition, the first stirring liquid of the wastewater in which the first stirring process is performed through the second stirring mechanism 50 is fed to the fourth stirring mechanism 60 connected to the transfer pipe 16, and passes through the transfer pipe 16. In the meantime, the second pH measurement is performed by the secondary pH sensor 62, and is then mixed with the secondary treatment solution by passing through the tertiary stirring mechanism 64 that generates the vortex.

On the other hand, the secondary treatment solution is made and supplied through the secondary treatment solution supply device 70, the system configuration of the secondary treatment solution supply device 70 is the same as the primary treatment solution supply device (30).

That is, the secondary treatment solution supply device 70 is composed of the chemical stirring tank 72, the intermediate storage tank 74, the supply storage tank 76, etc., the chemical stirring tank 72 through the water supply pipe (78) Mix the supplied water and the secondary polymer flocculant supplied from the chemical container 80 in a ratio of 2-3 ppm to rotate the stirrer 82 to obtain a uniformly stirred secondary treatment solution, and the secondary treatment solution is a valve (84). After being stored in the intermediate storage tank 74 through, the storage pump 76 is stored by the metering pump 86 is operated.

Then, the feed pump 87 and the valve 88 are supplied into the transfer pipe 16 through the connection pipe 88a and mixed with the primary treatment solution and the stirred wastewater.

In this way, the wastewater mixed with the primary and secondary treatment solutions is generated through the fourth stirring mechanism 60, as described above, by the vortex generated by the structure of the three spiral pipes. In the fourth stirring mechanism 60 formed of three spiral spiral pipes, a plurality of wedge-shaped protrusions 52 are formed to disturb the flow.

Then, the waste water uniformly stirred with the chemicals through the second stirring process as described above is introduced into the sludge flotation tank 90 through the transfer pipe 16 and the transfer pipe 16 as shown in FIG. After passing through the installed wastewater primary spray nozzles 92, the injection mechanism 100 shown in FIG. 5 having an elliptical final discharge pipe 94 and a plurality of final injection nozzles 96 positioned below the sludge bed. At high speed to the waste water is injected into the floating tank (90).

The final injection nozzle 94 is located below the sludge layer as shown in FIG. 10, and the inclination angle of the nozzle 94 is directed upward by about 5 °. At this time, the sludge is greatly agglomerated to rise above the water surface. And the sludge is pushed out of the center of the flotation tank 90, the sludge is pushed out to the outer center of the center is sucked and discharged to the outside through the suction pipe 112 by the flotation pump 110 located in the sludge layer is centrifugal (mido Is transported until

Then, only the purified waste water remains under the sludge flotation tank 90 and is discharged through the treated water discharge pipe 120.

If the purified wastewater in the sludge flotation tank 90 does not meet the requirements, a plurality of flotation tanks may be subjected to necessity if necessary, or in addition, it may be filtered through a pump to a separate filtration device for secondary filtering. .

Reference numeral 130 is a support.

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

When the primary inorganic coagulant and the ionizing surfactant are mixed in the waste water, the primary inorganic coagulant is ionized with cations and anions, and the ionized ion is used as the nucleus to combine with the foreign matter in the waste water to form a primary coagulation state (Floc, sludge particle state). Becomes

At this time, by supplying oxygen to the waste water through the blow and the pump 12, the dissolved oxygen amount is primarily increased, and the air is automatically sucked while being fed by the pump 14 in the second place. Then, the wastewater particles are separated very small while passing through the primary stirring mechanism 18 having the structure of the porous plate attached to the transfer pipe 16.

In addition, the wastewater is agglomerated by mixing the primary treatment solution from the primary treatment solution supply device 30, and the floc granules are dispersed in a myriad of small particles in the wastewater because the particles become small. Since natural sedimentation is difficult as shown in Figure 6 it is floating in the aggregated state in a small particle in the waste water.

On the other hand, in the waste water, the surfactant, which is a coagulation catalyst, is mixed with air to form a myriad of bubbles, and the first flocculate flocs are stuck around the bubbles while passing through the first stirring mechanism 18.

The secondary polymer flocculant was introduced into the sludge flotation tank 90 through the high speed injection nozzle 92 and the elliptical double high speed injection mechanism 100 and stirred therein. When the waste water is sprayed at high speed, bubbles that stick to the floc quickly clump together to form a large mass, and are buoyant and sprayed to rise above the water surface in an instant. The sludge floated is collected outside the center of the floating tank (outer circumferential side) without the final injection nozzle 96 is injected into the center of the floating tank 90 by the injection pressure to the center of the floating tank 90.

Therefore, the sludge gathered out of the center is sucked using the floating pump 110 to which a large amount of suction pipes 112 are attached. At this time, the position of the suction pipe 112 is located on the outside of the floating tank (90).

Herein, aluminum sulfate (Al ₂ (SO ₄ ) ₃ ), which is commonly used as the primary inorganic coagulant, is used, and POLYHER is used as the secondary polymer flocculant.

In the above, an important feature of the present invention is that by adding a surfactant into the wastewater, it reacts with the surfactant and air to form bubbles (many bubbles), and flocs that are aggregated around the bubbles adhere to each other and are greatly agglomerated by buoyancy. Since the sludge does not sink and maintains the injured state on the top, the sludge can be removed very easily.

As described above, according to the present invention, the first inorganic coagulant, the surfactant, and the second polymer coagulant are combined in the waste water, and continuously stirred evenly during transfer through the spiral stirring mechanisms 50 and 60 using three spiral pipes. Afterwards, when a circular envelop in the sludge flotation tank is sprayed at high speed (high pressure), small flocks of floccules aggregated around the bubble (bubble) generated by the surfactant stick together to form a large mass. It doesn't float and keeps on floating. Therefore, whenever a certain amount of sludge layer is formed, the sludge layer can be removed, thereby greatly improving the work efficiency, and the sludge flocculation effect is large, thereby greatly improving the wastewater purification efficiency.

In addition, the sludge is aggregated using the floating pump 110 to transfer the sludge to a desired place to separate the sludge and water using a centrifuge.

Claims (5)

In the sludge removal apparatus in the sludge flotation method of the sludge flotation method of the sludge flotation method to increase the treatment efficiency by injecting wastewater treatment chemicals into the wastewater collected in the sump (10), flocculation of harmful substances in the waste water to raise the sludge. At the rear of the dosing device (30) (70) is equipped with a spiral stirring mechanism (50, 60) for stirring and mixing waste water and chemicals, and a plurality of spraying the stirred waste water and chemicals in the sludge flotation tank (90) Sludge removal apparatus by the sludge flotation separation in the sedimentation tank, characterized in that the injection mechanism 100, having a flotation pump 110 for discharging the sludge separated in the flotation tank 90 to the outside. The pipe inner wall of the stirring mechanism (50, 60) is formed in a jig-shaped projection 52 in a zigzag to disturb the flow while the waste water is transported in a spiral to tumble phenomenon Sludge removal device by sludge flotation in the settling tank, characterized in that configured to maximize. 2. The injection mechanism (100) according to claim 1, wherein the injection mechanism (100) has an elliptical final discharge pipe (94) and a plurality of final injection nozzles (96) positioned below the sludge layer, and the final injection nozzle (94) has an inclination angle thereof. The sludge removal apparatus by separating the sludge in the sedimentation tank, characterized in that it is configured to rise above the water surface as the sludge is condensed greatly toward the above 5 °. According to claim 1, wherein the chemical injection device 30 is a mixture of 50-100ppm primary inorganic flocculant and 100-250ppm surfactant to make a primary treatment solution and stirred, the primary treatment solution is pH sensor (20 Sludge removal apparatus by the sludge flotation in the sedimentation tank, characterized in that measured in the) is introduced into the waste water. The method of claim 1, wherein the chemical injection device 70 is mixed with the secondary polymer flocculant to a ratio of 2-3ppm, the sludge flotation separation in the sedimentation tank, characterized in that the stirrer 82 is rotated to stir evenly into the waste water Sludge removal device