WO2012020962A2

WO2012020962A2 - Apparatus for treating highly concentrated wastewater using a jet loop reactor

Info

Publication number: WO2012020962A2
Application number: PCT/KR2011/005782
Authority: WO
Inventors: 전병근
Original assignee: 보람환경개발(주)
Priority date: 2010-08-11
Filing date: 2011-08-09
Publication date: 2012-02-16
Also published as: KR101036225B1; WO2012020962A3

Abstract

The present invention relates to an apparatus for biologically treating wastewater, including a two-phase nozzle which is used in the apparatus for biologically treating highly concentrated organic wastewater such as landfill leachate, wastewater resulting from raising livestock, liquid remaining after recycling food waste, etc., so as to increase the amount of dissolved oxygen in a reactor and to thus improve treatment efficiency. The two-phase nozzle of the apparatus for biologically treating wastewater according to the present invention sprays wastewater fed thereto to the inside of the reactor in a short amount of time so as to completely mix the wastewater, naturally sucks in air using the negative pressure generated during spraying, and generates and circulates micro-air-bubbles, thus increasing the amount of dissolved oxygen in the wastewater and improving microbial activity and volumetric loading. Existing wastewater treatment plants may be simply remodeled using the apparatus of the present invention in order to improve the treatment capacity thereof.

Description

High Concentration Wastewater Treatment System Using Jet Loop Reactor

The present invention includes a two-phase nozzle for a wastewater treatment apparatus that can improve the wastewater treatment efficiency by increasing the amount of dissolved oxygen in a jet loop reactor to treat high concentration organic wastewater, such as landfill leachate, livestock wastewater, and filtrate after food resources. A high concentration wastewater treatment apparatus using a jet loop reactor.

In human life, water is an essential element, and the constant or water supply inevitably causes sewage and wastewater. The treatment method of sewage and wastewater is mainly composed of biological treatment, and it is generally used to add physical and chemical treatment as a unit process. The biological treatment method used here mainly refers to aerobic treatment methods, such as activated sludge method, water spraying method, rotating disc method, aerobic digestion method.

High concentration organic wastewater has a high treatment effect because it is treated with high efficiency aerobic bioreactor in case of malignant wastewater whose loads vary greatly depending on the resource, seasonal and regional factors. In particular, food wastewater treatment is a technology that treats high concentration organic food wastewater such as desorption filtrate and leachate generated in the remaining food resource recycling facilities. It is a technology that can reliably treat sewage-linked water quality or self-discharge level in 1 ~ 4 days using high efficiency aerobic bioreactor. High concentration organic wastewater enters rivers, coastal seas, lakes (lakes and reservoirs), and promotes algae growth, causing eutrophication.

In addition, when the nutrients contained in the wastewater enter the coastal seas, it causes red tide. If the nutrients are severely decayed and odors are generated in the water, it acts as a cause to promote water pollution. It must be removed before it enters the site or appeal.

In Korea, most sewage treatment and livestock wastewater treatment methods rely on activated sludge method, and most suspended solids and organic matter can be removed during treatment of wastewater by the activated sludge method. Treatment of the salt material is only 20-40%.

The Jet Loop Reactor, released in Germany in 1985, is a third-generation bioreactor that operates COD volume loads from 120 to 800 through mass transfer and bioreaction kinetic improvements. After that, the situation is continuously increasing mainly in the high concentration wastewater treatment.

Referring to the general jet loop reactor shown in FIG. 3, the jet loop reactor is a cylindrical reactor with a closed top, and a two-phase nozzle is installed vertically at the center of the reactor. It has a simple structure consisting of a pump and a pipe. When the mixed-liquor suspended solid (MLSS) mixture and wastewater in the jet loop reactor are sent to the two-phase jet nozzle through a circulating pump, a liquid jet is formed at the nozzle end, and the injected air is formed into micro bubbles, and the formed micro bubbles are separated from the liquid jet. Together, they descend to the bottom of the reactor and hit the bottom to rise. At this time, the bubbles are rising, the oxygen is dissolved through a long gas-liquid contact time as some bubbles are repeatedly descended to the bottom along the liquid jet due to the downward flow formed near the injection nozzle.

The treatment efficiency of such a jet loop reactor depends on how much oxygen in the air is dissolved in the water, and since the amount of dissolved oxygen depends on the specific surface area and the contact time of the bubbles, the size of the bubbles must be made small in order to increase the specific surface area. In addition, the longer the contact time, the higher the oxygen dissolution rate, and the contact time can achieve a purpose by reducing the bubble size and increasing the circulation rate of bubbles.

The present inventors earnestly studied the jet loop reactor with improved treatment efficiency, and completed the present invention by developing a wastewater treatment apparatus including a two-phase nozzle capable of increasing the amount of dissolved oxygen in the jet loop reactor.

SUMMARY OF THE INVENTION An object of the present invention is to provide a biological wastewater treatment apparatus for high concentration wastewater treatment, including a two-phase nozzle having a structure capable of increasing the amount of dissolved oxygen used in an apparatus for biologically treating wastewater such as a jet loop reactor. .

In order to achieve the above object, the present invention is a biological wastewater treatment apparatus comprising a two-phase nozzle is installed vertically inside the reactor and a pump and pipe structure for circulating wastewater in the reactor, the two-phase nozzle is an external nozzle and the Including an inner nozzle formed inside the outer nozzle, the nozzle tip diameter (d2) of the outer nozzle is 2 to 4 times the nozzle tip diameter (d1) of the inner nozzle, the air suction is formed between the outer nozzle and the inner nozzle, The air suction unit provides a high concentration wastewater treatment apparatus using a jet loop reactor comprising an air suction pipe and a liquid suction hole.

The nozzle tip diameter d1 of the inner nozzle is preferably formed such that the flow rate at the nozzle tip represents 8-20 m / s.

The length L1 of the nozzle reduction portion of the inner nozzle is preferably (D0-d1) /0.37, where D0 is the inner diameter of the inlet part of the outer nozzle and the inner nozzle, and d1 is the nozzle tip diameter of the inner nozzle.

The reactor may be made of a cylindrical or square column type, but is not limited thereto. The aspect ratio (H / D) of the diameter (D) and the height (H) of the reactor is 2.5 to 8, and the distance from the lower end of the two-phase nozzle to the bottom of the reactor is made to be 2-3 times the reactor diameter. It is preferable to uniformly spray wastewater into the reactor through the two-phase nozzle.

Air may be injected into the two-phase nozzle through the air suction pipe to the two-phase nozzle, and air may be further injected into the two-phase nozzle through the blower connected to the air injection pipe.

The pump connected with the reactor may temporarily store the wastewater flowing over the reactor in the pumping tank and then introduce the wastewater into the reactor through the two-phase nozzle together with the inflow wastewater.

One or more two-phase nozzles are installed in the reactor, and a valve may be installed to adjust the circulation flow rate according to the flow rate and concentration during operation.

The present invention provides a wastewater treatment apparatus including a two-phase nozzle that can be used in the biological treatment of wastewater to increase the amount of dissolved oxygen, by spraying the influent wastewater into the wastewater treatment device in a short time to complete mixing, spraying The air is naturally inhaled using negative pressure generated during the process, and microbubbles are made and recycled to increase the amount of dissolved oxygen in the wastewater and increase the activity of microorganisms, thereby greatly improving the BOD volume load (2.1kg / ㎥.d Above) It is not only effective for high concentration wastewater treatment but also can greatly reduce the plant area and facility volume when applied to general wastewater. In addition, the existing wastewater treatment plant can be easily remodeled to significantly increase the treatment capacity.

1 is a perspective view of a two-phase nozzle used in a high concentration wastewater treatment apparatus using the jet loop reactor of the present invention.

2 is an exploded perspective view of a two-phase nozzle used in the high concentration wastewater treatment apparatus using the jet loop reactor of the present invention.

Figure 3 is a side cross-sectional view of a high concentration wastewater treatment apparatus using a jet loop reactor comprising a two-phase nozzle used in the present invention.

4 is a view schematically showing an operating state of a high concentration wastewater treatment apparatus using the jet loop reactor of the present invention.

Explanation of symbols on the main parts of the drawings

100: two-phase nozzle 101: external nozzle

102: internal nozzle 103: air suction pipe

104: liquid suction hole 105: male thread portion

106: female thread portion 109: air intake portion

110: blower 120: valve

130: pump 140: pipe structure

150: reactor 200: wastewater treatment apparatus

Hereinafter, the present invention will be described in detail with reference to FIGS. 1 to 4.

The present invention is a biological wastewater treatment apparatus including a pump 130 and a tubular structure 140 for circulating the wastewater in the reactor 150 is installed vertically inside the reactor 150, the The two-phase nozzle 100 includes an outer nozzle 101 and an inner nozzle 102 formed inside the outer nozzle 101, and the nozzle tip diameter d2 of the outer nozzle 101 is equal to that of the inner nozzle 102. It is 2 to 4 times the nozzle tip diameter d1, and an air suction part 109 is formed between the outer nozzle 101 and the inner nozzle 102, and the air suction part 109 is provided with the air suction pipe 103. It provides a high concentration wastewater treatment apparatus 200 using a jet loop reactor characterized in that it comprises a liquid suction hole (104).

In the high concentration wastewater treatment apparatus 200 according to the present invention, one or more two-phase nozzles 100 are installed vertically in the reactor 150, and wastewater in the reactor 150 by introducing wastewater through the two-phase nozzles 100. Carry out the treatment process.

Referring to FIG. 1, the two-phase nozzle 100 used in the high concentration wastewater treatment apparatus 200 according to the present invention includes an outer nozzle 101 and an inner nozzle 102 formed inside the outer nozzle 101. It is composed.

The two-phase nozzle 100 used in the high concentration wastewater treatment apparatus 200 according to the present invention may be manufactured by combining the external nozzle 101 and the internal nozzle 102 so that the nozzle can be easily replaced according to the load variation. have.

In one embodiment of the present invention, the outer nozzle 101 may be manufactured by separating the upper end portion formed with the air suction unit 109 and the lower end portion formed with the nozzle tip.

As described above, the two-phase nozzle 100 used in the present invention has a structure in which parts are interchangeably coupled to each part, so that when conditions different from those of the initial design occur, the inner nozzle 102 and the outer nozzle 101 are separated. It can be easily replaced and operated in an optimized state, and the treatment capacity can be greatly increased by simply remodeling an existing wastewater treatment plant.

In another embodiment of the present invention, the inner nozzle 102 may be manufactured to be integrally formed in the outer nozzle 101.

Referring to FIG. 2, in one embodiment of the present invention, the two-phase nozzle 100 used in the high concentration wastewater treatment apparatus 200 according to the present invention inserts an inner nozzle 102 into an outer nozzle 101. In this case, the female screw portion 106 formed inside the outer nozzle 101 and the male screw portion 105 formed outside the inner nozzle 102 may be manufactured.

In the above-described two-phase nozzle 100, the outer nozzle 101 and the inner nozzle 102 are described as being coupled by a screw member. However, the outer nozzle 101 and the inner nozzle 102 are coupled using another coupling member. The two-phase nozzle 100 can be manufactured.

In the external nozzle 101 of the two-phase nozzle 100 used in the present invention, an air suction unit 109 for introducing air is formed.

The air suction unit 109 formed at the outer nozzle 101 includes an air suction tube 103 and a liquid suction hole 104, and the air suction tube 103 is formed for natural inflow of air. In case of lack, additional air may be injected using a blower as shown in FIG. 3. The liquid suction hole 104 may suck the wastewater in the reactor by the negative pressure inside the air suction device, and the wastewater sucked through the liquid suction hole 104 is mixed with the air sucked from the air suction pipe 103. The bubbles are made fine by the strong turbulence of the injection water injected from the inner nozzle 102, and the injection water injected into the reactor 150 through the outer nozzle 101 is bent to reach the bottom of the bubble. The amount of dissolved oxygen in the reactor 150 may be increased by increasing the residence time.

When the wastewater is treated using the high concentration wastewater treatment apparatus 200 according to the present invention, the wastewater is injected into the two-phase nozzle 100 by the pump 130, and the air is negative pressure generated from the inner nozzle. It can be naturally introduced through the air suction pipe 103 connected to the outside by the pressure).

As shown in FIG. 3, the two-phase nozzle 100 may be connected to the blower 110, and when the inflow of natural water is insufficient, the blower 110 may be operated to introduce air into the two-phase nozzle 100. have.

In the external nozzle 101, the liquid suction hole 104 is formed above the position of the air suction pipe 103 (based on a state in which the two-phase nozzle is formed vertically), and the position of the air suction pipe 103 is It is preferable for the natural inflow of air to be formed near the nozzle tip.

The diameter d1 of the nozzle tip of the inner nozzle 102 is preferably formed such that the flow rate is 8-20 m / s at the nozzle tip.

The nozzle tip diameter d2 of the outer nozzle 101 is preferably 2 to 4 times the nozzle tip diameter d1 of the inner nozzle 102, but the nozzle tip diameter d2 of the outer nozzle 101 and the inner nozzle ( When the two-phase nozzle 100 is formed to have a ratio of the nozzle tip diameter d1 of 102 to 1, it is preferable to manufacture the two-phase nozzle so that the distance between the outer nozzle 101 and the inner nozzle 102 is close. It is preferable in natural inflow.

The length L1 of the nozzle reduction part of the inner nozzle 102 is (D0-d1) /0.37, and the length L2 of the nozzle reduction part of the outer nozzle 101 is preferably (D0-d2) /0.37. Where D0 is the inner diameter of the inlet of the outer nozzle and the inner nozzle, which is equal to the inner diameter of the inlet pipe of the two-phase nozzle 100. d1 means the nozzle tip diameter of the internal nozzle.

In order to minimize the loss caused by the shrinkage of the pipe, an orifice flowmeter's point reduction angle of 21 ° was used, and the length L1 of the nozzle reduction part of the inner nozzle 102 was calculated so that the back loss loss factor was 0.01 or less.

In the present invention, the nozzle reduction portion is a portion in which the diameter gradually decreases in the outer nozzle or the inner nozzle, and means a portion from the lower portion of the nozzle to the nozzle tip.

As shown in FIG. 1, the diameters of the upper end portions of the outer nozzle and the inner nozzle are equal to D0.

The inner diameter D0 of the inlet part of the outer nozzle and the inner nozzle is preferably a value that satisfies 2.5 to 6 times the diameter d1 of the nozzle tip of the inner nozzle 102 and a flow rate of 1 to 3 m / s at the same time. This is to maintain the tube shrinkage loss factor of 0.01 or less.

As shown in FIG. 2, the nozzle tip of the outer nozzle 101 may be manufactured to have various cross-sectional shapes such as a corrugated tube or a star tube. When the nozzle tip of the outer nozzle 101 is manufactured in the form of a corrugated tube or a star-shaped tube, when the gas-liquid mixed water (injection water) sprayed from the nozzle tip of the outer nozzle 101 is sprayed, it is circular. Since it is sprayed wider than the tube, the residence time of the bubble can be increased by sucking back the bubble rising to the bottom again.

As described above, the two-phase nozzle 100 used in the high concentration wastewater treatment apparatus 200 according to the present invention is formed of the outer nozzle 101 and the inner nozzle 102, and strong turbulence is formed between the two nozzles. As a result, fine bubbles can be formed.

As described above, the microbubbles formed in the two-phase nozzle 100 are discharged to the reactor 150 together with the introduced wastewater, and the discharged microbubbles rise to reach the bottom and reach the vicinity of the two-phase nozzle 100 when the pressure difference around the nozzles is different. This causes some to be reabsorbed to repeat the cycle. In addition, some of the rising bubbles are directed to the center of the circulating water discharged from the two-phase nozzle 100 while rotating in a spiral by the pressure and rotational force acting at the same time by the action of the liquid suction hole 104 is to be recycled.

This recirculation is repeated to increase the oxygen transfer rate at which oxygen in the air is dissolved in the liquid. The method of increasing the oxygen transfer rate is to increase the specific surface area by making microbubbles, increase the gas-liquid contact time, and increase the specific surface area of the microorganism receiving oxygen.

As the microbial flocs pass through the two-phase nozzle and meet the strong shear force and disintegrate into fine flocs, the microbial specific surface area is also large.

The reactor 150 used in the present invention may be a cylindrical or square columnar reactor, the aspect ratio (H / D) of the diameter (D) and height (H) of the reactor 150 is preferably 2.5-8. .

Referring to FIG. 4, since the microbubbles formed in the two-phase nozzle 100 descend to the bottom and then rise again, the gas-liquid contact time of twice the effective height of the reactor in one cycle is obtained. In addition, the rising microbubbles are recycled around the jet jet stream injected from the two-phase nozzle (100). For this reason, the higher the reactor height is better, but if too high to maintain a flow rate of 0.3 m / s at the bottom, the discharge pressure of the two-phase nozzle 100 must be increased, which results in a decrease in power efficiency. Therefore, in consideration of the pressure loss in the spraying two-phase nozzle 100, it is determined as a height that satisfies the depth, the injection angle, and the oxygen transfer rate 30% that can be reached when discharging at a flow rate of 8 to 20 m / s. In order to satisfy, it is preferable that aspect ratio (H / D) of diameter D and height H of reactor 150 is 2.5-8. If the flow rate is 0.3 m / s at the bottom, the sludge will not accumulate.

One or more two-phase nozzles 100 may be installed in the reactor 150, and the distance h1 from the lower end of the two-phase nozzle 100 to the bottom of the reactor is the diameter D of the reactor 150. In the case of 1.2 to 3 times, when the spray tip is injected from the nozzle tip of the outer nozzle 101, the spray angle is sprayed at an angle of 19 to 40 °, thereby allowing the gas-liquid mixed liquid to reach the bottom of the reactor evenly.

The high concentration wastewater treatment apparatus 200 according to the present invention includes a pump 130 capable of recirculating wastewater in the reactor 150 and a valve 120 for adjusting the circulation flow rate of the wastewater.

In the high concentration wastewater treatment apparatus 200 according to the present invention, the pump 130 is connected to the two-phase nozzle 100 and the reactor 150 by a tubular structure 140 to temporarily discharge wastewater in the reactor 150 to the pumping tank. It may be stored, and the wastewater of the pumping tank may be introduced into the two-phase nozzle 100 together with the new inflow wastewater.

In addition, the pump 130 may adjust the power by the pressure in the pipe to adjust the discharge diameter of the two-phase nozzle 100 to maintain a constant flow rate to adjust the flow rate of the circulating flow rate, the intake air according to the circulating flow rate The amount of can be determined.

When the high concentration wastewater treatment apparatus 200 according to the present invention is operated, the flow rate of the wastewater may be adjusted by adjusting the valve 120.

Claims

A biological wastewater treatment apparatus including a pump and pipe structure for circulating wastewater in a reactor vertically installed in the reactor with a two-phase nozzle,

The two-phase nozzle includes an outer nozzle and an inner nozzle formed inside the outer nozzle, the nozzle tip diameter d2 of the outer nozzle is 2 to 4 times the nozzle tip diameter d1 of the inner nozzle, and the outer nozzle and the inner nozzle. An air suction unit is formed between the nozzles, and the air suction unit is a high concentration wastewater treatment apparatus using a jet loop reactor, characterized in that it comprises an air suction pipe and a liquid suction hole formed in the upper position.
The method according to claim 1,

Inlet diameter (D0) of the inner nozzle is 2 to 6 times the nozzle tip diameter (d1), the nozzle tip diameter (d1) is characterized in that the flow rate is formed in the nozzle tip to 8 to 20 m / s High concentration wastewater treatment device using jet loop reactor.
The method according to claim 1,

The length L1 of the nozzle reduction part of the inner nozzle is (D0-d1) /0.37, and the length L2 of the reduction part of the outer nozzle is (D0-d2) /0.37, where D0 is the inflow of the outer nozzle and the inner nozzle. A secondary inner diameter, d1 is the nozzle tip diameter of the inner nozzle, d2 is the nozzle tip diameter of the outer nozzle, high concentration wastewater treatment apparatus using a jet loop reactor.
The method according to claim 3,

Cross section of the nozzle tip of the inner nozzle is a high concentration wastewater treatment apparatus using a jet loop reactor, characterized in that formed in a circular, creased circular or star shape.
The method according to claim 1,

The reactor is a cylindrical or square columnar reactor, high density wastewater treatment apparatus using a jet loop reactor, characterized in that the aspect ratio (H / D) of the diameter (D) and height (H) of the reactor is 2.5 to 8.
The method according to claim 1,

The high concentration wastewater treatment apparatus using a jet loop reactor characterized in that the distance from the lower end of the two-phase nozzle to the bottom of the reactor is 1.2 to 3 times the diameter of the reactor.
The method according to claim 1,

The air is naturally introduced into the two-phase nozzle through the air suction pipe of the two-phase nozzle, and if the air is insufficient, by operating the blower to further inject air into the two-phase nozzle through the air suction pipe connected to the blower High concentration wastewater treatment device using a reactor.
The method according to claim 1,

The pump is a high concentration wastewater treatment apparatus using a jet loop reactor characterized in that the wastewater overflowed to the reactor temporarily stored in the pumping tank and then introduced into the reactor through the two-phase nozzle with the incoming wastewater.
The method according to claim 1,

One or more two-phase nozzles are installed in the reactor and further include a valve for adjusting the circulating flow rate according to the inflow flow rate and the concentration during the operation, and the two phase nozzles are replaced when the different conditions occur during the initial design and operate in an optimized state. High concentration wastewater treatment apparatus using a jet loop reactor characterized in that it can be.