KR101412699B1 - Apparatus And Method For Treating High Concentrated Organic Wastewater and High Concentrated Nitrogenous Wastewater - Google Patents

Abstract

The present invention relates to a high concentration organic wastewater and an apparatus for treating a high concentration nitrogen wastewater, comprising a reaction tank including an aeration tank for treating high-concentration organic wastewater in the influent water with microorganisms, and a denitrification tank for treating high-concentration nitrogen wastewater in the influent water with microorganisms, An air diffusing device for generating air bubbles by supplying air from a blower installed outside of the aeration tank; an activity confirmation tank installed inside the aeration tank for checking the activity of the microorganisms by the change of the dissolved oxygen value (DO) A sedimentation tank for introducing the wastewater treated by the aeration tank and the denitrification tank into the aeration tank and the denitrification tank, respectively, and discharging the supernatant; and a high concentration organic To some of the wastewater is used as an organic carbon source, And a PC control device for observing and controlling the meter provided in the activity confirmation tank, and a control device for monitoring and controlling the meter provided in the activity confirmation tank. .

Description

TECHNICAL FIELD [0001] The present invention relates to a high concentration organic wastewater, a high concentration nitrogen wastewater treatment apparatus, and a treatment method using the same. [0001] The present invention relates to a high concentration organic wastewater and a high concentration nitrogen wastewater treatment apparatus,

The present invention relates to a high concentration organic wastewater and a high concentration nitrogen wastewater treatment apparatus and a treatment method using the same. More particularly, the present invention relates to a method for simultaneously treating a high concentration of malignant organic wastewater and a high concentration nitrogen wastewater generated from a chemical plant, The present invention relates to a high concentration organic wastewater and a high concentration nitrogen wastewater treatment apparatus and a treatment method using the same.

In order to purify ethylene gas and purify the sulfur compounds contained in crude oil, caustic soda is added to the oil refining process, and high temperature steam is introduced into each process for mixing, resulting in a high temperature waste gas containing a high concentration of sulfur compounds do. The lungs are highly alkaline with a pH of 12 or higher. They contain sulfur compounds (H ₂ S, HS ^- , S ^{2 -} etc.) And sulfate and have a very high TDS of 130 g / L or more. Because of this characteristic, waste soda wastewater is classified as reactive sulfur compound (DO03) in the US Resource Conservation and Recovery Act (RCRA) and treated as hazardous waste. Incineration and evaporation enrichment have been a major factor in the disposal process. However, these physicochemical treatments have problems such as an initial investment cost, an increase in maintenance cost, and a waste of energy.

Amine wastewater is a waste solution of an amine solution used to absorb / remove H ₂ S in the off-gas generated from a refinery and a heavy oil decomposition facility, and is mostly present in an organic nitrogen form And the total nitrogen (TN) concentration is more than 4,000 ppm, which has a great influence on the nitrogen load at the wastewater treatment plant.

Biological treatment methods for treating wastewater by using microorganisms are widely used because they have less possibility of secondary contamination and are more economical and more efficient than physicochemical treatment. However, the organic load is 5 to 20 kg-CODcr / m 3.day It is not possible to treat wastewater with high concentration / high load by the standard standard activated sludge method. In particular, wastewater containing toxic organic compound has no solution without parallel physical and chemical treatment.

In order to solve this problem, aerobic microorganisms, which have a rapid decomposition rate and do not inhibit the activity even with toxic substances inflow, are kept in MLSS (Mixed Liquor Suspended Solid) state, and dissolved oxygen which is essential for organic matter decomposition is supplied, Biological treatment was also possible in wastewater conditions. pH, temperature, etc., the microorganisms became compliant with the treatment conditions of high concentration organic wastewater, but the difficulty of maintaining MLSS with high concentration, the decrease of efficiency of oxygen supply, and the sludge settling rate of the treated liquid decreased.

Various types and materials of fixed and fluid carriers have been developed to maintain high concentration of MLSS. In order to increase the amount of dissolved oxygen, a method of spraying high pressure air, a method of increasing air contact surface by using micro air bubbles, To increase the oxygen fraction. However, it is true that the effect is not significant in terms of economic efficiency and efficiency. In addition, due to the viscosity increase due to the high load, the oxygen transfer can not be smoothly performed, the processing load and treatment efficiency are lowered, the circulation pump does not operate normally, and the sludge dewatering efficiency is lowered.

The present invention enables the integrated treatment of high concentration organic wastewater and high concentration nitrogen wastewater which can not be treated by the general standard activated sludge process by a biological process,

First, since organic wastewater and nitrogen wastewater can act as an organic carbon source necessary for denitrification of nitrogen wastewater and a nitrogen source necessary for oxidation of organic wastewater, organic wastewater is classified as an aerobic treatment device and nitrogen wastewater is classified as a denitration treatment device. The purpose of this study is to make the amount of wastewater transferable between each reactor depending on the amount and concentration of wastewater.

Second, since the types of microorganisms involved in the treatment of organic wastewater and nitrogen wastewater are different, an object of the present invention is to enable efficient treatment of organic wastewater and nitrogen wastewater by separating an aeration reaction tank for organic matter oxidation and a denitrification tank for nitrogen removal .

Third, in the aeration tank, the air generated from the blower is transferred to the inside of the aeration tank using the acoustic resonance diffuser, and the oxygen supply rate is 20 to 30% higher than that of the general diffuser. The power ratio is 20 to 30% So that waste water treatment at a high concentration and at a high load can be performed.

Fourth, in the oxygen transfer process through the blower, high-temperature air of 90 ° C or higher flows due to the heat of the blower, and the temperature of the aeration tank rises. Therefore, a cooling scrubber is installed at the downstream of the blower, The temperature of the water of the microorganism can be lowered to a temperature not lowering the activity of the microorganism.

Fifth, the microorganism activity confirmation tank is installed separately on the upper part of the aeration tank to check the change of DO and viscosity due to the stoppage of inflow of wastewater. The most important microorganism activity in biological wastewater treatment process is analyzed and analyzed, So that it is possible to control the operation of the engine.

Sixth, the viscosity confirmation tank is added to the activity confirmation tank on the upper part of the aeration tank to closely measure the oxygen transmission rate and the sludge dewatering efficiency. The viscosity is accurately measured and continuously monitored without being disturbed by the measurement of viscosity such as vapors And to control the viscosity of the aeration tank by controlling the amount of wastewater inflow, inputting industrial water, and injecting a viscosity inhibitor into the aeration tank.

Seventh, the organic waste water and the nitrogen wastewater constitute the connection pipe so as to function as the organic carbon source of the denitrification reaction tank and the nitrogen source of the aeration tank, respectively, and the flow meter and the flow rate control valve are provided in the connection pipe, So that the flow rate can be adjusted.

In order to accomplish the above and other objects of the present invention, according to an embodiment of the present invention, there is provided an apparatus for treating a high concentration organic wastewater in a biological reactor, comprising: an aeration reaction tank for treating high concentration organic wastewater in the influent water with a microorganism; and a denitration reaction tank for treating high- And an air diffusing unit for receiving air from a blower installed outside of the reaction tank to make fine air bubbles, and an aeration unit installed inside the aeration tank for checking the activity of microorganisms by changing the dissolved oxygen value (DO) Aeration tank for introducing the wastewater treated in the aeration tank and the denitrification tank into the aeration tank and the denitrification tank, and a supernatant tank for discharging the supernatant; So that a part of the organic wastewater at a high concentration is used as an organic carbon source, And a PC control device for observing and controlling a meter provided in the activity confirmation tank, and a control device for monitoring and controlling the meter provided in the activity confirmation tank The present invention provides a high concentration organic wastewater and a high concentration nitrogen wastewater treatment apparatus.

It is still another object of the present invention to provide a method for producing a high concentration organic wastewater, comprising the steps of: reacting a high concentration organic wastewater in an influent water with an aeration tank planted with microorganisms and a high concentration nitrogen wastewater in influent water through a denitrification tank planted with microorganisms; Supplying a portion of the high-concentration nitrogen wastewater to the aeration tank so as to be used as a nitrogen source necessary for the treatment of the high concentration organic wastewater, And a step of transferring the wastewater treated in the aeration tank and the denitrification tank to the settling tank so that the microorganism sludge is settled and returned to the aeration tank and the denitrification tank, respectively, and the supernatant is discharged; Dissolved oxygen values (DO) and points Diagnosis of microbial activity to change, including the step of controlling the facilities to the PC program provides a high-concentration organic waste water with the high concentration nitrogen wastewater treatment method which comprises.

According to the present invention having the above-described constitution, it is possible to treat organic wastewater and nitrogen wastewater which can not be treated by a general standard activated sludge process using an acoustic resonance acid furnace with a high oxygen supply rate and a high concentration of MLSS.

In addition, it is possible to shorten the treatment time, to efficiently manage the treatment reaction tank and to carry out an economical treatment process, and to solve the problems caused by precipitation and poor viscosity.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic view showing an apparatus for treating highly concentrated organic wastewater and a highly concentrated nitrogen wastewater according to an embodiment of the present invention; FIG.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In this process, the thicknesses of the lines and the sizes of the components shown in the drawings may be exaggerated for clarity and convenience of explanation.

In addition, the terms described below are defined in consideration of the functions of the present invention, which may vary depending on the intention or custom of the user, the operator. Therefore, definitions of these terms should be made based on the contents throughout this specification.

1 is a schematic view showing a high concentration organic wastewater and a high concentration nitrogen wastewater treatment apparatus according to an embodiment of the present invention.

1, the apparatus for treating high concentration organic wastewater and high concentration nitrogen wastewater according to an embodiment of the present invention includes a reaction tank 100, an aeration tank 130, an activity confirmation tank 170, a settling tank 112 and 122, A pipe 180, and a PC control device 190.

The reaction tank 100 comprises an aeration tank 110 for treating the high concentration organic wastewater in the influent water with microorganisms and an denitrification tank 120 for treating the high concentration nitrogen wastewater in the influent water with microorganisms.

The air diffuser 130 converts air supplied from a blower 140 installed outside the reaction tank 100 into fine air bubbles.

Here, the air diffuser 130 is preferably an acoustic resonator diffuser that supplies acoustic energy to the air to promote the oxygen dissolution action, increases the oxygen supply rate by the vortex shape, and reduces the power cost.

Such an acoustic resonance diffusing tube is semicircular because the problem of clogging is not generated unlike the ceramic or membrane diffusing tube, and the bubble spreads widely and is highly economical because of high efficiency and high capacity.

The air supplied to the reaction tank 100 through the blower 140 is cooled by the cooling tower 160 that provides the cooling scrubber 150 and the cooling water that is the heat medium of the cooling scrubber 150, It is preferable that the temperature of the sludge liquid in the sludge treatment tank 110 is adjusted to such a range that the microbial activity is not a problem.

The activity check tank 170 is a reaction tank for checking the microbial activity of the aeration tank 110 with a small aeration tank 1% or less of the volume of the aeration tank 110 installed in the aeration tank 110.

The activity check tank 170 is located near the outlet of the aeration tank 110 and a pipe 172 having a solenoid valve 172a is installed at a lower portion thereof. The sludge liquid in the aeration tank 110 continuously flows into the activity confirmation tank 170 along the pipe 172 provided with the solenoid valve 172a so that the sludge liquid flowing into the activity- (Not shown) of the condenser 170 to the settling tank 112, 122.

In addition, the activity confirmation tank 170 is divided into two activity confirmation groups. In one activity confirmation group, the DO sensor 174 detects the change of the DO concentration to check the microorganism's active state, In the bath, the viscosity is checked through the viscosity sensor 176 to confirm the microorganism's active state.

Here, the activation confirmation through the change of the DO concentration is performed when the sludge liquid in the aeration tank 110 is continuously introduced into the activity confirmation tank 170, the inflow is stopped due to the program control, and the microorganism is activated, The DO concentration of the active oxygen sensor 170 rises sharply, and when the oxygen concentration is high or the microbial activity is bad, the DO concentration of the active oxygen sensor 170 rises very slowly.

Therefore, since the flow rate of the wastewater can be controlled by grasping the degree of change of the DO concentration value in the activity confirmation tank 170 after the sludge liquid in the aeration tank 110 is stopped flowing into the activity confirmation tank 170, It is possible to treat wastewater and confirm the activity of microorganisms.

Activation confirmation through viscosity change is a phenomenon that occurs when the viscosity of the sludge liquid increases when the load of the organic matter is high. If the viscosity value measured by the continuous viscosity measurement in the activation confirmation tank (170) increases to 30 cPs or more, Thereby reducing the stress of the microorganism and decreasing the viscosity through the introduction of industrial water.

The settling tanks 112 and 122 separate the treated water from the aeration tank 110 and the denitrification tank 120 into sludge and supernatant.

It is preferable that the settling tanks 112 and 122 are made of a slope plate settling tank having an excellent sedimentation efficiency or a settling tank having an equivalent effect.

The connection pipe 180 supplies the organic waste water to the denitrification reaction tank 120 so that a part of the organic wastewater having a high concentration transferred to the aeration reaction tank 110 is used as an organic carbon source and a part of the nitrogen waste water having a high concentration transferred to the denitrification reaction tank 120 A line 10 for supplying a high concentration organic wastewater to the aeration reaction tank 110 and a line 20 for supplying a high concentration nitrogen wastewater to the denitrification reaction tank 120 so as to be supplied to the aeration reaction tank 110 so as to be used as a nitrogen source, Respectively.

The connection pipe 180 is provided with a flow rate control valve 182. The flow rate control valve 182 is connected to the flow meters 12 and 22 provided in the lines 10 and 20 for supplying the high concentration organic wastewater and the high concentration nitrogen wastewater Lt; / RTI >

The PC control unit 190 stops the supply of the sludge liquid to the aeration tank 110 continuously supplied to the activity confirmation tank in the aeration reaction tank 110 at a predetermined time interval using the control program, The concentration of the dissolved oxygen in the aeration tank 110 and the viscosity value of the aeration tank 110 are measured to determine the microbial activity state of the aeration tank 110 and the flow rate of the wastewater supplied to the aeration tank 110 according to the microbial activity, The supply amount of industrial water supplied through the industrial water supply line 30 is automatically adjusted.

The PC control unit 190 also includes a line 10 for supplying organic wastewater at a high concentration to the aeration tank 110 and a concentration meter 12 and a concentration meter 12 installed at the line 20 for supplying nitrogen wastewater at a high concentration to the denitrification reaction tank 120. [ The flow control valve 182 provided in the connection pipe 180 installed to cross the organic wastewater supply line 10 and the nitrogen wastewater supply line 20 is adjusted by receiving the concentrations of the organic wastewater and the nitrogen wastewater And controls the flow rates of the nitrogen wastewater supplied to the organic wastewater supply line 10 and the organic wastewater supplied to the nitrogen wastewater supply line 20 through the connection pipe 180.

The high concentration organic wastewater and the high concentration nitrogen wastewater treatment method according to an embodiment of the present invention include a reaction step, a mutual supply step, a transportation and discharge step, and a control step.

In the reaction step, the high concentration organic wastewater in the influent water is allowed to react with the aeration tank 110 in which the microorganisms are implanted and the denitrification tank 120 in which the high concentration nitrogen wastewater in the influent water is introduced into the microorganism.

In the mutual supply step, in the reaction step, some of the high-concentration organic wastewater is supplied to the denitrification reactor 120 so as to be used as an organic carbon source necessary for treatment of the high-concentration nitrogen wastewater, and a part of the high concentration nitrogen wastewater is aerated To the reaction tank (110).

Here, a part of the high concentration organic wastewater is supplied to the denitrification reaction tank 120, and a part of the high concentration nitrogen wastewater is supplied to the aeration reaction tank 110, the load of the high concentration organic wastewater and the high concentration nitrogen wastewater is measured, The method comprising the steps of:

At this time, the volume load of organic wastewater and nitrogen wastewater is preferably 2 to 10 kg · CODCr / m ³ · day.

Here, the mutual supply amount of the organic wastewater and the nitrogen wastewater is determined by the following equation.

Where Lc1 is the organic load of the organic wastewater, Lc2 is the organic load of the nitrogen wastewater, Ln1 is the nitrogen load of the organic wastewater, and Ln2 is the nitrogen load of the nitrogen wastewater.

Using the above equations, the values of the mutual feeds F1 and F2 according to the organic load ratio (Lc1 / Lc2) of organic wastewater and nitrogen wastewater using the factors listed in Table 1 are shown in Table 2 and Graph 1 below.

At this time, the total nitrogen (TN) concentration of organic wastewater should be 100 ppm and the total nitrogen (TN) concentration of nitrogen wastewater should be more than 2,500 ppm.

Organic waste water property Nitrogen wastewater characteristics Description Q1 200 m3 / day Q2 100 m3 / day flux TOC1 8,000 ppm TOC2 2,000 pm Organic matter concentration Lc1 1,600 kg / day Lc2 200 g / day Organic load TN1 100 ppm TN2 2,500 pm Nitrogen concentration Ln1 20 kg / day Ln2 250 g / day Nitrogen load F1 ratio F2 atio Distributed flow rate

The organic load ratio (Lc1 / Lc2) Organic wastewater feed rate (F1) Nitrogen wastewater supply (F2) 2 0.92 0.00 3 0.58 0.02 4 0.41 0.05 5 0.31 0.09 6 0.25 0.13 7 0.20 0.17 8 0.17 0.21 9 0.14 0.25 10 0.12 0.29 11 0.10 0.34 12 0.09 0.38 13 0.07 0.42 14 0.06 0.47 15 0.05 0.51 20 0.02 0.73 25 0.00 0.96

[Graph 1]

As shown in the graph 1, the amount of organic wastewater and nitrogen wastewater fed according to the present invention is most ideal when the organic load ratio (Lc1 / Lc2) is 8.

The treated water in the aeration tank 110 and the denitrification tank 120 are transferred to the settling basins 112 and 122 to deposit the microbial sludge in the settling basins 112 and 122 and return the treated water to the aeration tank 110 and the denitrification tank 120, respectively, and the supernatant is discharged.

In the control step, the microorganism activity is diagnosed by changing the dissolved oxygen value (DO) and the viscosity of the activity confirmation tank 170 installed in the aeration reaction tank 110, and the microorganism activity is controlled by the PC program.

Here, the sludge liquid viscosity of the aeration tank 110 is preferably controlled in the range of 0.1 to 30 cp.

The auxiliary facility is installed outside the aeration tank 110 so that the temperature of the sludge liquid in the aeration tank 110 and the denitrification tank 120 due to the microbial metabolism heat is reduced within a range that does not adversely affect the activity of the microorganisms. A cooling tower 200 for supplying cooling water which is a heat exchange medium of the cooling scrubber 150, a cooling water transfer pump 150 for cooling the water supplied from the cooling water circulation pump 150, Concentration lines 12 and 22 installed in the organic wastewater supply line 10 and the nitrogen wastewater supply line 20 and the line 10 for supplying the organic wastewater at a high concentration to the aeration reaction tank 110 and the denitrification reaction tank 120, And a flow control valve 182 provided in a connection pipe 180 installed to cross the line 20 for supplying nitrogen waste water at a high concentration.

Further, when the aeration tank sludge liquid is intermittently stopped by the activity confirmation tank 170, diagnosis of the aeration tank active state through the dissolved oxygen concentration and the viscosity value of the activity confirmation tank 170, and adjustment of the wastewater and industrial water injection flow rate The viscosity of the sludge liquid in the aeration tank 170 can be kept constant by being controlled by the PC program.

Although the preferred embodiments of the present invention have been described with reference to the accompanying drawings, it will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit of the invention It can be understood that it is possible.

100: Reactor
110: aeration tank
120: Denitrification reactor
112, 122: settling tank
130:
140: Blower
150: cooling scrubber
152: Cooling scrubber liquid transfer pump
184: Coolant transfer pump
160: Cooling tower
170:
172: Piping
172a: solenoid valve
174: DO sensor
176: Viscosity sensor
180: Connector
182: Flow control valve
190: PC control device

Claims (11)

Aeration tank for treating the high concentration organic wastewater in the influent water with microorganisms, and a denitrification tank for treating the high concentration nitrogen wastewater in the influent water with microorganisms;
An air diffuser which is supplied with air from a blower installed outside of the reaction vessel to make fine air bubbles;
An activity confirmation tank installed in the aeration tank and confirming the activity of the microorganisms by changing the dissolved oxygen value (DO) and viscosity;
Aeration tank for introducing the treated wastewater from the aeration tank and the denitrification tank, respectively, to deposit the microbial sludge, return the treated sludge to the aeration tank and the denitrification tank, and discharge the supernatant;
Wherein a part of the high concentration organic wastewater fed to the aeration tank is supplied to the denitration reactor so that the organic wastewater is used as an organic carbon source and a part of the high concentration nitrogen wastewater fed to the denitrification reactor is supplied to the aeration reactor ; And
And a PC control device for observing and controlling the measuring instrument provided in the activity confirmation tank, wherein the high concentration organic wastewater and the high concentration nitrogen wastewater treatment device are provided.
The method according to claim 1,
Wherein the acid furnace uses an acoustic resonance acid furnace to increase the oxygen transmission rate to the microorganisms in the reaction tank and to reduce the electric power cost.
The method according to claim 1,
Further comprising a cooling scrubber and a cooling tower for lowering the temperature of air supplied through the blower to the reaction tank, and a high concentration nitrogen wastewater treatment device.
The method according to claim 1,
Wherein the settling tank is composed of a slope plate settling tank having an excellent sedimentation efficiency or a settling tank having an equivalent effect, and a high concentration organic wastewater treatment apparatus.
The method of claim 4,
The PC control device stops the sludge liquid in the aeration tank continuously supplied to the aeration tank in the aeration tank at a predetermined time interval and diagnoses the microbial activity through the dissolved oxygen concentration and the viscosity value of the active tank at that time, Characterized in that the flow rate of wastewater and the amount of injection of industrial water are automatically controlled according to the microbial activity, and a high concentration organic wastewater and a high concentration nitrogen wastewater treatment apparatus.
Reacting the high concentration organic wastewater in the influent water with the aeration tank in which the microorganisms are implanted and the denitrification tank in which the high concentration nitrogen wastewater in the influent water is introduced into the microorganism;
In the reaction step, a portion of the high-concentration organic wastewater is supplied to the denitrification tank so that it is used as an organic carbon source necessary for the treatment of the high-concentration nitrogen wastewater, and a part of the high-concentration nitrogen wastewater is used as the nitrogen source necessary for the high- Feeding the reaction mixture to a reaction tank;
The aeration tank and the denitrification tank are respectively transported to a settling tank, and the microbial sludge is settled and returned to the aeration tank and the denitrification tank, respectively, and the supernatant is discharged; And
And diagnosing the microbial activity by changing the dissolved oxygen value (DO) and the viscosity of the activity confirmation tank installed in the aeration tank, and controlling an auxiliary facility by using a PC program. The high concentration organic wastewater and the high concentration nitrogen Wastewater treatment method.
The method of claim 6,
Concentration organic wastewater is supplied to the denitrification tank and a part of the high concentration nitrogen wastewater is supplied to the aeration tank in the aeration step, the load of the high concentration organic wastewater and the high concentration nitrogen wastewater is measured to calculate the mutual movement amount Wherein the high concentration organic wastewater and the high concentration nitrogen wastewater treatment method further comprise:
The method of claim 7,
Wherein a volume load of the high concentration organic wastewater and the high concentration nitrogen wastewater is 2 to 10 kg · CODCr / m ³ · day, and the high concentration organic wastewater and the high concentration nitrogen wastewater are treated.
The method of claim 7,
Wherein the organic wastewater migration amount is calculated by the following equation in the step of calculating the mutual movement amount of the organic wastewater and the nitrogen wastewater.
[expression]

Lc1 is the organic load of organic wastewater; Ln2 is the nitrogen load of organic wastewater; and Ln2 is the nitrogen load of nitrogen wastewater.
The method of claim 7,
Wherein the amount of movement of the nitrogen wastewater in the step of calculating the mutual movement amount of the organic wastewater and the nitrogen wastewater is obtained by the following equation.
[expression]

Ln2 is the nitrogen load of the organic wastewater; and Ln2 is the nitrogen load of the nitrogen wastewater. ≪ tb >< TABLE >
The method of claim 6,
And the sludge liquid viscosity of the aeration tank is controlled to operate in a range of 0.1 to 30 cp.

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