KR100286617B1 - Wastewater treatment method using pure oxygen and equipment thereof - Google Patents

Abstract

PURPOSE: A wastewater treatment method using pure oxygen is provided, which can supply maximum oxygen into the surface of finely sprayed wastewater particles by mixing with cooling water by pressurized spray method. The cooling water is saturated with oxygen in a sealed reactor by feeding sufficient amount of oxygen and air and mixing followed by dilution. Also, the habitat for aerobic microorganism is kept at optimum condition by keeping the temperature constantly using heater, thereby can treat wastewater in high efficiency. The system can also eliminate any danger caused by feeding oxygen directly to wastewater. CONSTITUTION: The method comprises the following steps: (i) a No.1 process that collects wastewater and removes impurities by screen; (ii) a No.2 process that removes coagulated flock by agitating and adding various chemicals and primarily aerate; (iii) a No.3 process that sprays the No.2 stage wastewater as a fine particles and mix with cooling water that is saturated with pure oxygen and air which are selectively mixed; (iv) a No.4 process that removes phosphorus and ammonia by adding chemical to the tertiary treated water; and (v) a No.5 process that settles and filters the treated water of the No.4 process.

Description

Wastewater Treatment Method and Apparatus

The present invention relates to a method and apparatus for treating wastewater using pure oxygen. More particularly, the present invention relates to wastewater by directly dissolving pure oxygen in wastewater, such as washing water, and various wastewaters, such as washing water. High concentration of organic materials using pure oxygen eliminates the risk of ignition or explosion caused by contact of gas generated from wastewater with pure oxygen, as well as eliminating the configuration of a control device according to the direct use of pure oxygen. A method and apparatus for treating wastewater.

There are various methods of treating various kinds of household wastewater, livestock wastewater, wastewater discharged from various factories, and leachate generated from various landfills, such as chemical treatment, biological treatment, and a combination thereof.

As a chemical treatment method, as disclosed in Patent Publication No. 96-9386, after the leachate is reacted with the iron salt-based chemicals, the step of condensation using a polymer coagulant and the precipitated suspended solids precipitated, and the step of filtering and removing the fine suspended solids And, there is a leachate treatment method of the inorganic sludge landfill site consisting of an oxidation treatment with a chlorine-based oxidizing agent, and a step of adjusting the pH, this chemical treatment method is omitted below because it is different from the wastewater treatment method to be dealt with in the present invention. .

Biological treatment, in particular, the treatment of wastewater using aerobic microorganisms is a method of removing various organic substances contained in the wastewater by ingesting the microorganisms in the aeration tank in the presence of dissolved oxygen. Most of them are oxidized, decomposed, aggregated, and adsorbed. And physical and chemical treatments such as precipitation. In general, this method is called a biologically activated sludge method.

There are various methods of the biologically active sludge method, but in each method, the microorganisms present in the influent wastewater ingest and decompose organic materials to supply oxygen required for powder growth. As an oxygen supplying method, a method of injecting air into wastewater using a surface aeration device or blowing fine bubble air or pure gaseous oxygen into water using various acidic devices is used.

However, this method of supplying oxygen to the activated sludge is performed by circulating the water stream and dissolving oxygen in the process of simply raising the bubble oxygen in the water to the surface, so the residence time of the introduced oxygen is short and the consumption of oxygen is increased. On the other hand, the use efficiency of oxygen is lowered, which is disadvantageous and inefficient, and there is a problem such that expensive facility investment is required to collect and reuse oxygen lost to the outside.

In addition, the biological wastewater treatment system by pressurized jet mixed spinning of gaseous oxygen in Korea Practical Publication No. 93-316 developed to solve this problem has a high concentration in the circulating pump outlet pipe disposed outside the aeration tank to circulate and supply the wastewater of the aeration tank. Gas oxygen of pressurized water was injected to make oxygen contact the circulating water, and this circulating water was injected into the aeration tank through the mixed spinning machine installed at the nozzle end of the underwater pipe to supply oxygen necessary for the activation of microorganisms into the wastewater. Even if a device is needed to pressurize pure oxygen and supply it to the circulating wastewater, the circulation time is short.

Accordingly, the present invention has been made to solve the problems of the prior art, and its object is to provide a closed aeration tank by dissolving and supplying pure oxygen to the cooling water without supplying pure oxygen directly to the waste water in the method of performing the chemical treatment and the biological treatment in parallel. It is an object of the present invention to provide a method for treating wastewater using pure oxygen which eliminates the risk of ignition or explosion due to direct contact between the gas generated from the wastewater and pure oxygen when used.

Another object of the present invention is to supply oxygen by saturating oxygen in the cooling water and to mix the waste water with the cooling water in the form of fine particles by pressurized spraying, thereby reducing the time for dissolving the oxygen in the cooling water into the wastewater and simultaneously reducing the oxygen in the wastewater. An object of the present invention is to provide an apparatus for treating wastewater using pure oxygen, which can improve the dissolution rate.

Still another object of the present invention is to provide an apparatus for treating wastewater using pure oxygen, which can increase the efficiency of purification of wastewater by using a combination of chemical and biological methods.

1 is a schematic view of a wastewater treatment apparatus using pure oxygen according to the present invention.

2 is a detailed view of a second aeration tank;

3 is a schematic diagram of a pure oxygen dissolving device for cooling water.

4 is a heating tube piping diagram arranged in a second aeration tank;

<Description of reference numerals for the main parts of the drawings>

10: sump tank 12: sump pipe

14: submersible pump 20: first aeration tank

22: stirrer 30: second aeration tank

32: heating pipe 34: treated water inlet pipe

36: pressure pump 39: circulation pipe

40: microorganism treatment tank 50: sedimentation tank

60: air supply 62: blower

64, 66: air supply line 70: chemical supply unit

80: cooling water supply unit 81: oxygen cylinder

82, 86: ejector 84: air diffuser

87: diffuser 89: cooling water tank

90: storage tank 94: immersion emphasis

In the wastewater treatment method using pure oxygen for achieving the object of the present invention, in the wastewater treatment method of aeration treatment of the wastewater and proceeding the precipitation and filtration process, the wastewater is collected to remove impurities from the screen And a second step of removing the flocculated floc by adding various chemicals while stirring the wastewater passed through the first step, and removing the flocculated primary aeration process, and spraying the treated water passed through the second step to form fine particles. A third step of secondary aeration after mixing with cooling water saturated with oxygen, a fourth step of removing phosphorus and ammonia using a chemical in the treated water of the third step, and a treated water of the fourth step It is characterized by including the 5th process of precipitation filtration.

The wastewater treatment apparatus using pure oxygen for realizing this method is a wastewater treatment apparatus which collects wastewater and proceeds chemical and biological treatment and then discharges the treated water through a process such as predetermined precipitation and filtration. A screen for removing contaminants from waste water, a first aeration tank for introducing various chemicals and air into the waste water from which the contaminants have been removed, a first aeration tank for removing flocculation flocculated by chemical reaction treatment, and a first aeration, and the treated water in the first aeration tank is pressurized It is characterized in that it comprises a second aeration tank which is introduced into the mixed aeration treatment with oxygen-saturated cooling water, and further comprises a microbial treatment tank for treating the treated water passed through the second aeration tank by introducing aerobic microorganisms It can be done by.

At this time, the second aeration tank is provided with at least one stage of heating tubes arranged in a reticular structure, the injection nozzle is configured to spray the treated water of the first aeration tank flows into the heating tube, and the treated water introduced into the second aeration tank It is better to form a circulation pipe sprayed on the heating tube again by circulating. Such a configuration may vary depending on the organic matter concentration or throughput of the wastewater to be treated.

Hereinafter, an apparatus and a method for treating wastewater using pure oxygen according to the present invention will be described in detail with reference to the accompanying drawings.

1 is a schematic diagram of an apparatus for treating wastewater using pure oxygen according to the present invention.

Referring to the drawings, the apparatus of the present invention is largely a screen (not shown), a collection tank 10, a first aeration tank 20, a second aeration tank 30, a microbial treatment tank 40, a settling tank 50 , An air supply unit 60, a chemical supply unit 70, a cooling water supply unit 80 (see FIG. 3), and various pipes and pumps.

The collecting tank 10 is connected to the collecting pipe 12 of various sewage or wastewater, and the conduit 64 connected to the blower 62 of the air supply 60. In some cases, a screen capable of removing large contaminants from the wastewater flowing into the sump 10 may be installed in front of the sump 10 and may eliminate the air supply line 64.

Therefore, the wastewater introduced into the collection tank 10 through the collection pipe 12 receives air from the pipe line 64 and is mixed so that oxygen is dissolved in the wastewater to some extent. The waste water in the collection tank 10 may be immediately transferred after being decayed for a predetermined period of time and then transferred to the first aeration tank 20 or the post-treatment process includes a chemical process.

A water pump 14 is installed in the collection tank 10, and a pipe connected to the water pump is connected to the upper portion of the first aeration tank 20. Therefore, the wastewater in the sump flows into the first hopper of the first aeration tank 20 along the pipeline according to the operation of the submersible pump. At this time, the submersible pump 14 may be replaced with a general pump.

The first aeration tank 20 is composed of two stages of a first hopper and a second hopper. An overflow (not shown in the drawing) is installed in the upper first hopper so that the treated water of a predetermined water level or more flows into the lower second hopper, and a separate conduit is installed in the lower part of the hopper to remove flocculated flocs. In addition, a stirrer 22 is installed, and a supply pipe of co-precipitation agent such as silica, clay, fly ash, caustic soda, lactic acid peninsula (Al ₂ (SO ₄ ) ₃ ) and polymer coagulant is connected to the blower 62. From the air supply line 64 is connected.

Meanwhile, the chemical supply unit 70 is connected to tanks 72, 74, 76, 78 for introducing chemicals, and a pipe 66 that receives air from the water and blower 62 to these tanks. do. And a pipeline for supplying the contents of each tank to the first hopper of the first aeration tank 20 is connected. Here, in the case of the polymer coagulant, there may be a case in which a separate supply pipe is provided and supplied to the second hopper.

In the chemical supply unit 70 having such a configuration, chemicals are dissolved in water, air is introduced, and oxygen in the air is somewhat saturated, so that the chemical is supplied to the first aeration tank 20.

The wastewater introduced into the first hopper of the first aeration tank 20 reacts with various chemicals and air introduced in response to the operation of the stirrer 22 to increase the dissolved oxygen content of the wastewater to some extent and at the same time, agglomeration of various pollutants. Is done. The flocculated floc is collected and treated by a separate pipe not shown in the drawing, and the treated water flows over the overflow and flows into the second hopper below.

The diffuser is arranged in the second hopper, which is not shown in the figure. Here, the aeration of air through the diffuser is allowed to occur for about 30 minutes.

The configuration of the first aeration tank 20 can be modified and carried out as necessary. For example, the collection pipe and the inflow pipe of the floc and the inflow pipe of the polymer coagulant are selectively disposed.

The second aeration tank 30 will be described with reference to FIG. 2 as a hermetic reactor. Inside the aeration tank, a heating tube 32 formed in a mesh is formed in three stages. The heating tube 32 is circulated to receive hot water from a boiler configured separately, the arrangement and the number of stages of the heating tube 32 may be adjusted according to the concentration of the waste water to be treated or the amount of treatment. Referring to FIG. 4, the second aeration tank 30 has a heating tube 32 formed in a network from the hot water inlet 32a to the outlet 32b of the aeration tank.

In addition, a lower portion of the second aeration tank 30 is provided with a pipe and an overflow (not shown) which flows to some extent after the incoming cooling water and the primary treated water are mixed to some extent and flows to the next process.

Referring to FIG. 2, a conduit 34 is formed such that the first treated water in the first aeration tank 20 is supplied to the second aeration tank 30 by the pressure pump 36. It is arranged to be supplied at each stage of the heating tube 32, the nozzle 38 is provided at the end of the pipe line and the treated water is sprayed on the heating tube 36 by the pressure of the pressure pump 36. . In addition, the second aeration tank 20 is provided with a separate pipe line 39 and a pump 39a through which the treated water in the tank is circulated. Specifically, the circulation line is arranged to spray the treated water in the lower aeration tank in the upper portion of each heating tube 32, the configuration is a line for supplying the treated water of the first aeration tank 20 to the second aeration tank 30 Similar to

In addition, the second aeration tank (30) is formed with a conduit (89a) so that the oxygen-saturated cooling water is supplied from the upper side, and a connecting conduit with the blower 62 is provided so that air is introduced.

In the second aeration tank 30 configured as described above, the treated water of the first aeration tank 20 is sprayed in a particulate state to be further atomized while colliding with the heating tube 32, and in this state, the second aeration tank 30 comes into contact with the cooling water. Saturated oxygen is brought into contact and saturated with the wastewater. This process is further activated by the operation of the circulation line 39 will increase the amount of dissolved oxygen in the waste water. On the other hand, the heating tube 32 is arranged so that the lowermost one in the arrangement is positioned in the treated water so that the temperature of the treated water is about 30 deg. C, which is the optimum growth temperature of aerobic microorganisms.

The second treated water which has undergone the above process in the second aeration tank 30 flows into a predetermined storage tank 90 through an overflow, and separates the gas to the outside according to chemical reaction and air inflow in the aeration tank. Connect the pipeline to the top of the tank to collect and treat the generated gas separately. In addition to a separate treatment method, the generated gas may also be a method of treating the pipe by connecting the reservoir 90.

An agitator is installed in the storage tank 90 of the secondary treated water, and is connected to a chemical tank 92 containing a phosphorus coagulant or a settling agent such as Ca (OH) ₂ . Therefore, the secondary treated water introduced into the reservoir is mixed with Ca (OH) ₂ while stirring to activate unreacted substances. After that, the secondary treated water flows into the infiltration steel tank 94 along the connecting pipe, and the phosphorus is precipitated and removed, and then, the ammonia degassing reaction is transferred to the microorganism treatment tank 40.

The dissolving apparatus of pure oxygen is demonstrated with reference to FIG. Referring to the drawings, the pure oxygen dissolving device, that is, the cooling water supply unit 80 is an air diffuser (84) installed in the air diffusion tank (83) from the oxygen (82) and the air blower from the air blower (82) And the first mixed air is sent to the diffuser 87 installed in the cooling water tank 89 through another ejection 86 together with the air introduced through the other air inlet pipe 85 again. The air diffused by the diffuser 87 causes the mixed air to saturate inside the cooling water to saturate oxygen in the cooling water. Here, reference numeral 88 is a water cooler, 89a is a pipeline for supplying the oxygen-saturated cooling water to the second aeration tank 30, 81a is a flow meter. Air use at this time is optional.

Secondary treatment water passing through the second aeration tank 30 is introduced into the microbial treatment tank 40 by the operation of the predetermined pipe line and the pump 42 through the above process. Although not shown in the drawings, the microbial treatment tank is provided with a habitat environment for aerobic microorganisms, which is a technique well known in the art of the present invention, and a description thereof will be omitted.

Secondary treatment water introduced into the microbial treatment tank 40 is to be processed while the organic matter is ingested by the aerobic microorganisms while staying, and overflowed to the settling tank 50, filtration tank and the like is finally processed.

In summary, the treatment of wastewater using pure oxygen according to the present invention is carried out by collecting the wastewater in the sump tank 10 by screening and removing the small contaminants. ) Into the wastewater. Here, the waste water is uniformly mixed and reacted with various chemicals and air added while being stirred to cause aggregation. The flocculated floc is collected and treated by a separate conduit, and the primary treated water is pressurized and sprayed onto the heating tube 32 of the second aeration tank 30. Accordingly, since the primary treated water is sprinkled onto the heating tube 32 as fine particles, it is further atomized while being heated and mixed with the cooling water, so that oxygen can be easily saturated. In the second aeration tank, the oxygen generated in the first treatment water is saturated and self-reacted while being mixed with the cooling water, and the gas generated by the self-reaction is collected and treated separately.The overflowed second treatment water is treated with a microorganism treatment tank through removal of phosphorus and deaeration of ammonia. 40). Here, after the remaining organic matter is ingested by the aerobic microorganisms, the treated water is discharged to the outside through a settling tank and a filtration tank.

As described in detail above, according to the present invention, the particles of the wastewater sprayed into the fine particles by the pressure injection method by mixing and diluting a sufficient amount of oxygen with air and dissolving it in the cooling water by adding pure oxygen in a closed reactor. Efficiently supply the maximum oxygen to the surface, and maintain the temperature of the waste water by the heating tube, so that the growth environment of aerobic microorganisms is ideal, so that the waste water treatment is smooth, as well as increase the treatment efficiency, oxygen In the case of directly supplying the wastewater to the wastewater, a control device used to reduce the risk of ignition or explosion is not required, and thus, the cost of the equipment and the operation can be reduced.

Claims (7)

In the wastewater treatment method in which the wastewater is aerated and then subjected to the precipitation and filtration processes, the first step of collecting the wastewater and removing contaminants on the screen and the flocculation by adding various chemicals while stirring the wastewater passed through the first step. A second step of removing the floc to be removed and performing a first aeration process, a third process of spraying the treated water having undergone the second step with a cooling water saturated with oxygen in the form of fine particles, followed by a second aeration treatment; And a fifth step of removing phosphorus and ammonia using chemicals in the treated water of the third step, and a fifth step of precipitating and filtering the treated water of the fourth step. Treatment method. The method of treating wastewater using pure oxygen according to claim 1, wherein the cooling water saturated with oxygen is pure oxygen selectively dissolved in cooling water by mixing air. In the wastewater treatment apparatus which collects the wastewater and proceeds chemical and biological treatment, and then discharges the treated water through a process such as predetermined precipitation and filtration, a screen for removing the wastewater contaminants and various kinds of wastewater from which the A first aeration tank for introducing a chemical reaction and air, and a first aeration tank for removing flocculated flocs by primary aeration, and a second aeration treatment in which the treated water of the first aeration tank is introduced into a pressurized spray state and mixed with oxygen-saturated cooling water Apparatus for treating wastewater using pure oxygen, characterized by comprising an aeration tank. 4. The apparatus for treating wastewater using pure oxygen according to claim 3, wherein the second aeration tank is provided with at least one stage of heating tubes arranged in a network. 5. The apparatus for treating wastewater using pure oxygen according to claim 4, wherein an injection nozzle is formed at an end of the treated water inlet pipe so that the treated water of the first aerated tank introduced into the second aeration tank is sprayed on the heating tube. The apparatus of claim 3, wherein the second aeration tank includes a pipe line and an injection nozzle for spraying the treated water introduced into the aeration tank again on a heating tube. The apparatus for treating wastewater using pure oxygen according to claim 3, further comprising a microbial treatment tank for treating aerobic microorganisms of the treated water that has passed through the second aeration tank.