KR101384367B1 - Wastewater treatment ultrasonic wave - Google Patents

Abstract

A multi-mixing type water treatment apparatus, according to the present invention, includes: a biological reactor; a deaeration tank prepared with an air blowing pipe which is connected to the bioreactor and installed inside, and a gas supplying pump for supplying gas; a multi-mixing tank which is connected to the deaeration tank, and which has a first agitation unit; an aggregating agent input unit for inputting an aggregating agent into the multi-mixing tank; a settling tank which is connected to the deaeration tank; and a sonication tank installed with an ultrasonic wave oscillator between the bioreactor and the deaeration tank.

Description

Multi-miscible water treatment device {wastewater treatment ultrasonic wave}

The present invention relates to a water treatment apparatus, and more particularly, to a water treatment apparatus of a multi-miscible method of improving the sedimentation efficiency of the fine particles using ultrasonic waves, microbubbles and flocculants.

Wastewater treatment process is classified into physical treatment process, chemical treatment process, and biological treatment process. Each process is described as follows. The physical treatment process is a method of removing particulate matter present in the waste water by physical manipulation, and physical methods such as flotation, precipitation, and filtration are used. Specifically, there are various forms such as a screen, a settling tank and a floating tank. Chemical treatment process is a method of removing organic matter, inorganic matter, suspended matter and suspended solids in the waste water. Neutralization method, flocculation method, oxidation method, reduction method, adsorption method, etc. are typical methods.

The biological treatment process is a method of treating organic and inorganic contaminants contained in waste water by microorganisms, and classified into aerobic microorganisms and anaerobic microorganisms depending on the microorganisms used.

In wastewater treatment, these methods may be selected or used in combination. However, the active sludge process using aerobic microorganisms is most commonly used. It is known as a representative biological wastewater treatment method. The activated sludge process introduces wastewater that has undergone primary physical and chemical treatment such as flocculation and sedimentation into an activated sludge tank (usually composed of activated sludge aeration tank and sedimentation tank) to decompose and reduce organic matter by the activity of activated sludge. It is composed of the process of separating the activated sludge divided into iv) and the treated sludge treated water divided into liquid phase by the precipitation method. The stability of these processes must be maintained to ensure the stability of the entire wastewater treatment process. The stability of the process means that the organic material contained in the wastewater into which the activated sludge in the activated sludge tank is grown is used as a source of growth while maintaining a floe of an appropriate size and shape. It is greatly affected by appearance, driving conditions, etc.

In particular, when industrial wastewater containing various hardly decomposable and toxic substances is treated by an activated sludge process, sludge bulking, etc., is difficult because an environment in which activated sludge can be properly grown in an activated sludge tank is difficult to be achieved. An abnormal phenomenon occurs. The sludge bulking phenomenon is known to be due to the formation of filamentous fungi, overload operation, lack of nitrogen phosphorus, lack of DO, inflow of toxic substances, change of water temperature, as well as the dismantling of the excessive flocs.

When the sludge bulking phenomenon occurs in the sedimentation tank, the sedimentation of the sludge is inhibited and the solid-liquid separation becomes difficult, which causes a decrease in the overall wastewater treatment efficiency.

On the other hand, in most sewage treatment facilities or small wastewater treatment plants, organic substances are decomposed and removed by the microbial decomposition to make them discharged. However, it is difficult to manage the various properties of microorganisms and the entire treatment facilities effectively and technically. to be. Particularly in the active sludge aeration tank (contact oxidation tank), even when microorganism proliferates actively and contaminants are sufficiently decomposed and removed, sludge particles are over-aerated, long-term stay or synthetic detergent inflow, decay anaerobic by contact agent, Due to various factors such as excessive turbulence, dissolution, dissolution or structural defects in the sedimentation tank, insufficient sludge particles are formed. By being discharged, it has exceeded the emission limit and has emerged as the main culprit of river water pollution. The deterioration of discharged water quality in the water treatment plant is largely due to the sedimentation efficiency of the sedimentation tank. In fact, after the natural sedimentation, the concentration decrease is more than 50%.

Korean Patent Publication No. 2011-0068697 discloses a water treatment method, and Patent Publication No. 1998-0065511 discloses a chemical input and stirring device for improving the final sedimentation efficiency of a wastewater treatment plant. The disclosed stirring device has a configuration in which a stirring device for agitating a drug is installed inside the reactor.

And, Patent Publication No. 2006-0087087 discloses a coagulant automatic injection device. The published coagulant automatic injection device converts the particle surface charge into a flow current by measuring the particle surface charge contained in the water by continuously introducing the raw water introduced into the water treatment device and the coagulant water flowing out after the coagulant is completely stirred. A current measuring cell that amplifies the voltage of the converted flow current, a coagulant controller for controlling the coagulant injection amount by controlling the current amplified by the current measuring cell in an optimum state, and a current value amplified by the current measuring cell is continuously recorded. And a coagulant injection pump for increasing or reducing the amount of coagulant injected by turning on / off the valve according to a standard value already set through the coagulant controller. .

As described above, by adjusting the input of the flocculant, the removal of colloidal contaminants and the adsorption of the soluble substances are enhanced, so that the biological treatment efficiency is relatively decreased, and the pH value of the effluent is increased due to excessive denitrification during the high treatment. have.

* The present invention is to solve the problems as described above, to provide a multi-miscible water treatment apparatus capable of coping with the regulation of unstable formation of flocs, sludge bulking, removal of nitrogen and phosphorus when treating biological wastewater. There is this.

Another object of the present invention to provide a multi-mixing water treatment apparatus that can improve the quality of the effluent by improving the settling efficiency in the settling tank.

The multi-mixing water treatment apparatus according to the present invention for achieving the above object is a dewatering device having a bioreactor and a gas supply pump having a gas supply pump connected to the bioreactor and supplying gas and an acid pipe installed therein. Keynote,

A multimixing tank connected to the degassing tank and having a first stirring unit, an agglomerating unit for introducing a coagulant into the multimixing tank, and a settling tank connected to the degassing tank,

It characterized in that the ultrasonic treatment unit provided with an ultrasonic oscillation unit therein between the bioreactor and the degassing tank.

In the present invention, there is further provided a floc stabilization tank having a second stirring unit between the multi-mixing tank and the settling tank. The stirring speed of the second stirring unit is lower than that of the first stirring unit, and the diffuser is preferably a membrane diffuser.

Multi-mixing water treatment apparatus of the present invention can increase the particle size of the sludge for the precipitation of the treated water, improve the sedimentation efficiency in the sedimentation tank by activating the aggregation and adsorption of fine particles, it is possible to improve the water quality of the effluent. .

In addition, the present invention can increase the cohesive effect of the flocculant and improve the sedimentation efficiency of foreign substances, thereby reducing the cost of wastewater treatment and stabilizing the wastewater treatment efficiency.

1 is a view showing a multi-mixing water treatment apparatus according to the present invention,
2 is a view showing another embodiment of a multi-mixing water treatment apparatus according to the present invention.

Multi-miscible water treatment apparatus according to the present invention is to activate the precipitation efficiency in the sedimentation tank during the water treatment, an embodiment is shown in FIG.

Referring to the drawings, the multi-mixing water treatment apparatus 10 according to the present invention is connected to the degassing tank 30, the degassing tank 30 is connected to the bioreactor 20, the bioreactor 20 is completed pretreatment A multi-mixing tank 40 having a first stirring unit and a precipitation tank 50 connected to the multi-mixing tank 40 are provided.

Inside the degassing tank 30 to temporarily agglomerate the particulates, and an diffuser 31 is installed inside the diffuser 31, which is a gas for pumping gas, that is, air to supply the diffuser. The compressor 32 is provided. Preferably, the diffuser uses a membrane diffuser capable of finely dividing air, which is a gas.

Between the bioreactor 20 and the degassing tank 30, there is provided an ultrasonic processing tank 60 in which the ultrasonic oscillation unit 61 is installed. The ultrasonic treatment tank 60 hydrolyzes water by irradiating the aggregated colloidal particles with ultrasonic waves to decompose H ⁺ and OH ⁻ , and the produced OH- reacts with Al ^{± 3} in the flocculant to form Al (OH). Will be switched to ³ . At this time, when H ⁺ remaining in the treated water increases, the particle size expands in response to the negative charge on the particle diameter surface of the sludge, thereby facilitating the aggregation or adsorption of colloidal particles.

The ultrasonic treatment tank 60 may be installed by dividing the degassing tank (20).

The first stirring unit 41 installed in the multi-mixing tank 40 includes a drive motor 42 installed in a frame (not shown), and an impeller 43 driven by the drive motor. The multi-mixing tank 40 further includes a coagulant input unit 70 for supplying a coagulant. The coagulant input unit 70 is a coagulant supply pipe 74 connecting the inorganic coagulant tank 71, the polymer coagulant tank 72, and the alkali coagulant tank 73, respectively, and the quantitative amount of the coagulant supply pipe 74. A pump 75 is provided. In addition, valves for controlling the discharge of the coagulant are installed at each outlet side of the inorganic coagulant tank 71, the polymer coagulant tank 72, and the alkaline coagulant tank 73 to supply the selected coagulant through the coagulant supply pipe 74. Make sure

On the other hand, between the multi-mixing tank 40 and the settling tank 50 may be further provided with a floc stabilization tank 80 as shown in FIG. The floc stabilization tank 80 is further provided with a second stirring unit 81 for stirring the treated water, the second stirring unit 81 is formed substantially the same as the configuration of the first stirring unit 41 It may be, but is not limited thereto, and a stirring network (see FIG. 2) may be installed. The stirring speed (10 to 50rpm) of the second stirring unit 81 is preferably slower (60 to 100rpm) slower than the stirring speed of the first stirring unit 41.

The multi-mixing water treatment apparatus 10 according to the present invention configured as described above is treated by applying ultrasonic waves to the treated water supplied from the bioreactor 20. The treated water supplied from the bioreactor 20 is introduced into the ultrasonic treatment tank 60 and then treated by the ultrasonic wave oscillated by the ultrasonic wave oscillation unit 61 to purify the water in the aggregated cladding particles as described above. decomposed by H ⁺ and OH ^- and decomposition, if the H ⁺ that remain in the treated water increases to thereby react with the negatively charged surface of the particle size of the sludge grain diameter is expanded thereby promote agglomeration and adsorption of the colloidal particles.

When the ultrasonically treated water is supplied to the degassing tank 30, gas and microbubbles are supplied from the diffuser 31 installed in the degassing tank 30 to agglomerate the fine particles contained in the treated water and increase the amount of dissolved oxygen. do. When the concentration of DO in the treated water supplied from the bioreactor 20 is 0.2 ppm or less, excessive denitrification and decay occurs in the final sedimentation tank 50, and the discharge water quality is increased due to the growth of filamentous fungi and the surface injury of the rising denitrification bubble of DH. It may be worsened, the DO concentration (about 0.5ppm range) can be adjusted by the microbubble supplied from the membrane diffuser 31 in the degassing tank 30, thereby improving the reactivity in the multi-mixing tank and , Gas such as CO ₂ , CH ₄ generated in the bioreactor 20 can be degassed.

The treated water passing through the degassing tank is introduced into the multi-mixing tank 40, and a flocculant selected according to the quality of the treated water is introduced. Inorganic or organic flocculant is added according to pH, floc state, sedimentation, etc. of the treated water introduced into the multi-mixing tank 40 to enhance the biochemical treatment efficiency by removing colloidal contaminants and enhancing the adsorption power of soluble substances. .

The treated water in the multimixing tank 40 flows into the floc stabilizer 50, which is stirred by the second exchanger unit 81 installed in the floc stabilizer 50 to promote the flocculation of the residual flocs. Let's go.

According to the experiment of the inventors, the treated water and the water quality before the treatment by the multi-miscible water treatment apparatus according to the present invention was examined to obtain the results as shown in Table 1 below.

Biological
Oxygen Demand (BOD) Chemical oxygen demand (COD) Suspended solids (SS) Total Nitrogen (T-N) Total Person (T-P) Concentration before treatment (life sewage) 111.7 85.3 94.7 46.39 4.84 Sedimentation water after biological treatment 12.1 9.7 10.6 7.35 3.51 Throughput (%) 89.17 88.63 88.81 84.16 27.48 Biological treatment + multiplexing + precipitated water 7.7 6.3 5.2 6.08 0.12 Throughput (%) 93.11 92.61 94.51 86.89 97.52 Biological Treatment + Ultrasonic Treatment + Multiplexing + Precipitated Water 5.6 4.1 2.8 4.89 0.06 Throughput (%) 94.99 95.19 97.04 89.46 98.76

As can be seen from Table 1, when the wastewater is treated using the multi-miscible water treatment apparatus according to the present invention, the content of nitrogen and phosphorus, suspended solids (SS) and residual organic matter can be significantly reduced.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the scope of the invention.

Accordingly, the true scope of protection of the present invention should be determined only by the appended claims.

The multi-mixing water treatment apparatus of the present invention is widely applicable to an apparatus for treating wastewater.

20; bioreactor
30; degassing tank
40; multiple mixing tank
50; settling tank
60; ultrasonic treatment tank

Claims (3)

A degassing tank having a bioreactor 20, a gas supply pump 32 connected to the bioreactor 20 and having an acid pipe 31 installed therein and a gas supply pump 32 for supplying gas. 30,
A multimixing tank 40 connected to the degassing tank 30 and having a first stirring unit 41, an agglomerating unit 70 for introducing a coagulant into the multimixing tank 40, and the degassing tank It is provided with a settling tank 50 is connected to 30,
There is provided an ultrasonic treatment tank 60, the ultrasonic oscillation unit 61 is installed between the bioreactor 20 and the degassing tank 30,
Ultrasonic treatment and multiple mixing system water treatment device characterized in that it comprises a floc stabilization tank (80) having a second stirring unit (81) between the multi-mixing tank (40) and the settling tank (50). delete The method of claim 1,
The stirring speed of the second stirring unit 81 is slower than the stirring speed of the first stirring unit 41, and the diffuser 31 is an ultrasonic treatment and a multi-mixing type water treatment device, characterized in that it consists of a membrane acid engine. .

Images