KR100702425B1 - The agitator of vertical style to attach microorganism to waste tire and causes denitration and dephosphorization reaction hormoniously, and the constitution method - Google Patents

Abstract

The present invention relates to an optimal vertical stirrer and a method for constituting the most suitable element in agitation for attaching microorganisms to a carrier (carbon coating after waste tire powder molding) so as to facilitate the denitrification and dephosphorization reaction of the sewage treatment plant and wastewater treatment plant. It is about.

The agitation method should be equipped with a suitable vertical stirrer in consideration of the nature of the carrier, such that the fluid and the carrier are smoothly circulated in the reaction tank of the carrier including the carrier. The number of revolutions, etc. shall be taken into account.

Thus, the present invention is to form a stator blade, the number of stator blades, the size of the stir blades, the installation position of the stir blades, the number of rotations of the petty carrier so that the appropriate support and smooth stream flow of the carrier can be generated with the minimum required power The present invention relates to providing an optimum stirrer.

Hydrofoil type, agitator

Description

The agitator of vertical style to attach microorganism to waste tire and causes denitration and dephosphorization reaction hormoniously, and the constitution method}

 1 degree is a representative view of agitator application form

2 degrees is the form of fluid flow

 3 is a flow chart of a bioreactor reaction tank with microorganisms attached to a carrier

■ Explanation of the major symbols used in the main parts of the drawings ■

1: Drive part (motor, reducer)

 2: base housing (drive part support)

 3: impeller shaft

 4: stirring blade (Hydrofoil type-consisting of hub and 4 blades)

The present invention relates to a stirrer for smoothly performing denitrification and dephosphorization in a method in which microorganisms are attached to a carrier (waste tire) and a method of constructing the same.

In order to prevent the precipitation of the carrier in the agitator tank and induce fluid circulation by using a general underwater stirrer (vertical type) or horizontal type, it is difficult to properly support the carrier and consume a lot of power, which makes it difficult to maintain energy efficiency and maintain even efficiency.

In addition, depending on the installation position of the stirrer, even with the same stirring blade rotation speed and power, the difference in efficiency occurs about 10 to 20%. Most of the carriers are precipitated at the corners of the agitator tank, causing a decrease in efficiency.

As the circulation of the slurry is not carried out to carry out the secondary support (using the acid engine), which is induced from the lower part to the upper part of the water surface, the circulation for activating the reproduction of microorganisms does not occur properly. Is done.

The main factor is that when the agitator is applied, the stirring blades (wings) are very small, so that the flow velocity near the stirring blades is fast, but the flow velocity around them is slow. not. In addition, since the carrier is used as a waste tire (rubber), many obstacles to fluid flow occur. Therefore, in the local flow, the circulation flow of the carrier is very weak.

Therefore, in the present invention, to increase the fluid circulation rate of the anaerobic tank and anoxic tank to facilitate the growth of bacteria to increase the dephosphorization and denitrification reaction efficiency of the pettial carrier, the shape and diameter of the stirring blade of the hydrofoil stirrer and stirring It is to optimally configure and provide the blade installation position.

The scale-up method of the stirrer was applied to configure the composition Criteria, and Lab Scale and Pilot Scale experiments were conducted for this, and the method of constructing the optimal condition by predicting the agitation at full scale was studied. It was invented as a technical problem of the present invention to provide a stirrer capable of obtaining the maximum effect.

Figure 1 is a representative view of the application form of the stirrer, Figure 2 is a schematic view of the fluid flow, Figure 3 is a process diagram of the reaction tank reaction tank attached to the microorganism in the carrier the present invention

When the microorganism is attached to the waste tire carrier to facilitate the denitrification and dephosphorization reaction, a vertical stirrer and a method of configuring the same will be described in detail.

Inducing dephosphorization and denitrification by attaching microorganisms in the carrier is carried out by adding a carrier (waste tire) while maintaining the residence time of the active sludge process, and supporting the carrier by primary fluid flow using a stirrer and a secondary diffuser. It is a method to increase the treatment efficiency of denitrification and dephosphorization by injecting air to generate a support to the upper surface layer of the carrier, the third carrier circulation flow (induction flow). Referring to Figure 3, the circulation form of the fluid is made in the order of ① ~ ⑨ of FIG.

 ① Influent

 ② induction into internal reaction vessel

 ③ Induce fluid to the lower side of the impeller

 ④ Induce air from the nozzle point using a blower to guide the carriers stacked on the bottom of the tank to the side of the tank from the bottom of the tank by the flow force of the fluid.

 ⑤ Raise the carrier to the surface by the power of air by stirrer and blower

 ⑥ Carrier is guided to the external reaction vessel and the external reaction vessel by the flow guided by the flow force of the stirrer. That is, it generates the induced flow, which is the core of the total circulation power and plays a big role in power saving.

   Denitrification / Dephosphorization reaction occurs due to circulation of carrier and fluid from ① to ⑥.

⑦ Elevation of treated water denitrification / dephosphorization

 ⑧ Low dimension comes out through trough

 ⑨ Runoff

Size of the carrier (5-8㎛), specific gravity (1.06 ~ 1.09), filling rate (15-20%), sedimentation rate (5 ~ 8㎛) applied to the present invention using a vertical hydrofoil stirrer in the treatment method as described above 40-80 times of sludge) and shape (irregular circular) to select and drive the appropriate impeller type, installation height, diameter, and rotation speed according to agitation conditions and purpose in order to reduce flow and power. will be.

In order to achieve the above object, the present invention is composed of a stirring blade (wing) and a hub, an impeller shaft, a driving unit (motor and reducer) and a supporting bracket as shown in FIG. 2.

Agitated vane uses Hydrofoil series with high flow / power consumption (Nq / Np) ratio, and the combined hub is mainly applied at 39 ° ~ 45 °, which is very good in stirring effect.

Agitator blades can be designed with a stabilizer to prevent shaft breakage and drive bearing damage due to hydraulic forces and threshold vibrations.

Impeller shaft is designed to have enough Shear Stress (Ss) to withstand the shaft moment applied to agitation and to design critical speed within 75%.

The drive unit should be selected to provide sufficient torque to give flow to the agitation tank.

Drive support bracket is designed to absorb the vibration of the stirrer.

In order to achieve an optimal configuration under these existing conditions, the following experimental procedure was conducted.

In addition, the scale-up law applied to the experiment was implemented by applying the following formula.

N1 is the rotational speed on Lab Scale, N2 is the rotational speed on Pilot Scale, D1 and D2 are impeller diameter on Lab and Pilot Scale, respectively. n is an exponential value

If you explain the technology development process in more detail

1. Lab Test

⑴ Purpose

The purpose of this study is to derive the optimum impeller for the purpose of BIO-SAC (II) by comparing and reviewing carrier flow and power change by various rotation speed and installation height.

⑵ method

LAB Test facilities are fabricated and various types of impellers are applied to confirm the flow of the carrier, that is, the precipitation of the carrier and its uniform distribution.

① Selection of impeller type-Identifying the degree of support by impeller type

-15% carrier

② Selection of Impeller Installation Location-Apply 4-Blade Hydrofoil φ400㎜ (68Rpm drive)

⑶ results

① Impeller type has better flow effect than 4-Blade Hydrofoil Type. (4 impellers with feathers)

② The diameter of the impeller is Φ400mm (35.4% of the diameter of the tank, that is, the ratio of D / Te is 0.354) and the installation height is 150mm (37.5% of the diameter of the impeller, namely C). / D ratio is 0.375) and the flow effect is good.

③ Based on the carrier flow effect on the Lab Scale, the impeller rotation speed needs to be about 68 ~ 70 rpm.

④ In order to infer more accurate values, the pilot scale is made on the basis of the above Scale (Scale up-rule).

2. Pilot Test

⑴ Purpose

As an intermediary verification test procedure for designing the impeller selected in Lab Test to full scale, the optimal impeller is to be derived by checking the flow and application power of the carrier.

⑵ method

① Make a pilot test facility and apply the impeller selected in Lab Test to check the settling and uniform distribution of carrier and check the power value.

② To reflect the design in full scale, it is necessary to verify the baseline data. Therefore, it is necessary to compare the lab test experimental data with the scale-up method. In practice, it is best to check the flow using the flow rate meter, but it is difficult to measure the flow rate of the carrier because the sensor of the flow rate meter may be damaged.

⑶ results

① As a result of confirming carrier support level by applying impeller diameter (Φ1840㎜) and installation height (690mm) predicted by Lab Scale, carrier support is achieved at approximately 21 ~ 22 rpm.

(As a result of checking the precipitation of the carrier at the corner of the blind area in the tank, it was confirmed that no precipitation occurred.)

② When driving at 22RPM, voltage is 196 ~ 200V, current is about 5.6A and power is about 2 ~ 2.26 2 ..

③ Although it was not confirmed in the Lab Test, in the Pilot test facility, the circulating flow occurred smoothly due to the reaction of the carrier through the internal reaction passage.

3. Full Scale Simulation

⑴ Purpose

When the impeller selected in Lab Test and Pilot Test is designed to full scale, the expected power, impeller diameter, and proper rotation speed will be derived.

⑵ method

Prediction of carrier flow and uniform distribution using the shape of the impeller, the installation position, and the application speed by the scale-up method in the Pilot Test.

⑶ results

① In the lab scale, the impeller rotation speed required for carrier support is 68 ~ 70 rpm.

② In pilot scale, impeller rotation speed required for carrier support is about 22 rpm.

③ The impeller diameter at full scale is about Φ6.0m and the installation height is about 2.25m at the bottom of the tank. Estimates of impeller rotation required for carrier support are approximately 9 to 9.2 rpm.

The type of impeller applied to the bioreactor (carrier tank) is to be selected with four stirring vanes. This is because four stirring blades produce the strongest mixing when the same power is applied.

For the equivalent diameter [Te = 1.13 × √ (L × W)] with respect to the length versus width of the bioreactor (carrier tank), it is preferable that the diameter D of the impeller is about D / Te = 0.354.

That is, if the diameter of the impeller is too small compared to the diameter of the tank (D / Te <0.354), a large amount of power is consumed and the overall flow is lowered compared to the same power, which causes a decrease in efficiency.

If the diameter of the impeller is too large for the tank diameter (D / Te> 0.354), it will interfere with the support of the reaction vessel in the carrier tank and the overall flow will be reduced.

As for the installation position (C) of an impeller, it is most suitable to float about 0.375 times the diameter (D) of an impeller from a rough bottom. At this time, the circulation function of the fluid and the carrier is best compared to the same power. Depending on the size of the installation position of the impeller, the difference in flow efficiency is apparent.

Through the vertical stirrer for attaching microorganisms to the waste tire carrier to facilitate the denitrification and dephosphorization reaction and the method of configuring the same, it is possible to maintain even efficiency while preventing the precipitation of the carrier in the bioreactor and reducing the power consumption in fluid circulation. Carrier (carbon coating after waste tire powder molding) is added to the treatment plant and wastewater treatment plant to attach microorganisms so that the denitrification and dephosphorization reaction can be performed smoothly.

Claims (3)

In the method of configuring a vertical stirrer, Once the characteristics of the carrier (type, specific gravity, size, rate of precipitation, shape, carrier filling rate) and stirring tank size are determined, ① Deriving the best type of vertical hydrofoil impeller that meets the conditions by making lab test-equipment and applying various types of impeller to confirm the precipitation and uniform distribution of carrier; ② manufacturing the Pilot Test-Pilot Test facility to determine whether the carrier is settled and uniform distribution by applying the impeller selected in the Lab Test and deriving the applied power according to the optimum flow of the carrier by checking the power value required at this time; ③Full scale simulation-Pilot Test predicts the carrier flow and uniform distribution using the impeller shape, installation location and scale-up method, and predicts the power, impeller diameter, and proper rotation speed in the optimal state. Deriving a location; Method for constructing a vertical stirrer for smoothing denitrification and dephosphorization by attaching microorganisms to a waste tire carrier comprising applying and configuring an optimal vertical stirrer through the above process Vertical to agitate the decanter and dephosphorization reaction by attaching microorganisms to the vertical stirrer waste tire carrier comprising the configuration according to the installation position and power, proper rotation speed, and impeller diameter in the agitator tank derived through the process of claim 1. Type stirrer The size of the carrier (carbon coating after waste tire powder molding) size (5 ~ 8㎛), specific gravity (1.06 ~ 1.09), filling rate (15 ~ 20%), sedimentation rate (40-80 times of sludge), shape (irregular) In the stirrer constituted of a stirring vessel composed of a circular shape) and having an equivalent diameter [Te = 1.13 × √ (L × W)] with respect to the width to the height, With four blades as the stirrer, the diameter (D) of the applied impeller is D / Te = 0.354, The installation position (C) of the impeller is a vertical stirrer for smoothing denitrification and dephosphorization reaction by attaching microorganisms to the waste tire carrier including 0.375 times the diameter of the impeller from the bottom of the tank (C = 0.375 D).

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