KR100657597B1 - Electrolysis Apparatus with Aeration for removing Total Nitrogenous Compound from Waste Water - Google Patents

Abstract

The present invention relates to an electrolysis device for total nitrogen removal of wastewater having an aeration device configured to increase the decomposition rate by forming an aeration device in an electrolysis device used to remove nitrogen components contained in the wastewater.

The present invention is a reactor housing for receiving and discharge the waste water in order to electrolyze the incoming waste water; A plurality of electrode plates installed inside the housing to electrolyze waste water; Power supply means for applying a current to electrode plates provided at both ends of the plurality of electrode plates; Aeration means installed at an inner lower end of the housing to supply air for aeration; It provides an electrolysis device for total nitrogen removal of wastewater having an aeration device, characterized in that it comprises an air supply means for supplying air to the aeration means.

Electrolysis, Wastewater, Nitrogen, Aeration, Air

Description

Electrolysis Apparatus with Aeration for removing Total Nitrogenous Compound from Waste Water}

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a block diagram of a wastewater treatment system for explaining an electrolyzer for removing total nitrogen of wastewater having an aeration device according to the present invention.

Figure 2 is a perspective view for explaining the structure of the electrolyzer for removing total nitrogen of wastewater having an aeration device according to the present invention.

3 is a cross-sectional view taken along the line A-A 'of FIG.

Figure 4 is an exemplary view for explaining the state of charge of the electrode plate in the present invention.

Figure 5 is a cross-sectional view for explaining the aeration air supply process in the present invention.

Figure 6 is a block diagram for explaining the air supply process in the present invention.

Figure 7 is a graph showing the decomposition rate in the electrolysis and electrolysis and aeration conditions in the present invention.

Explanation of symbols on the main parts of the drawings

10: sump 15: reservoir

20 reactor 30 electrode plate

40 reactor bottom plate 41 groove

42: nozzle plate 43: nozzle

44: adapter 45: connection

The present invention relates to an electrolysis device for total nitrogen removal of waste water having an aeration device, and more particularly, to nitrate nitrogen (NO ₃ ^-- N), nitrous nitrogen (NO ₂ ^-- N), ammonia nitrogen Electricity for removing total nitrogen of waste water with aeration device that increases the decomposition rate by forming an aeration device in the electrolysis device used to remove nitrogen components contained in the waste water in the (NH ₃ -N, NH ₄ ⁺ -N) state. It relates to a decomposition device.

In general, when the wastewater is discharged with nitrogen, it causes eutrophication of water quality and causes green algae and red tide, and also causes cyanosis or cancer when it enters drinking water such as groundwater. The nitrogen content should be removed and discharged.

Although the biological treatment method is recommended as a method of removing nitrogen components from the wastewater, the biological treatment method has an excellent effect, but since the carbon source such as methanol must be added for the growth of microorganisms and the removal of nitrogen, the treatment cost is high. There is a problem that the overall equipment is enlarged because it is expensive and the reaction time is long.

In addition, it is difficult to control the pH, the temperature or the wastewater components, and the wastewater containing toxic substances such as heavy metals or chlorine ions can kill the microorganisms. There is a problem.

In addition, physicochemical methods such as filtration, carbon adsorption, electrodialysis, reverse osmosis, selective ion exchange and evaporation are also used. These techniques do not decompose nitrogen, but only because it is a method of separating and concentrating nitrogen, there is a problem that needs to be reprocessed afterwards.

In recent years, several attempts have been made to remove nitrogen using metal powder and sulfamic acid developed in the United States, and to remove nitrogen using waste metal chips. In the former case, sulfamic acid, which is a kind of organic substance added to remove nitrogen, may increase total nitrogen, and the metal powder may have to be recovered again. There is a problem in that heavy metals that are dissociated from the waste metal chips have to be recovered along with the problem of causing secondary pollution due to acid washing. Cyanide removal, ozone oxidation, electrolytic oxidation, aeration, microbial decomposition, acidic degassing, and pure activated sludge are used for the removal of cyanide.

Meanwhile, in the "electrochemical wastewater treatment apparatus" filed by the applicant on March 9, 2004 with the application number 10-2004-0015907, a technique using an electrolysis machine is introduced to remove total nitrogen components contained in the wastewater. have.

In order to efficiently remove nitrogen contained in the wastewater, the wastewater passing through the reactor must pass through the electrode evenly in contact with the surface of the electrode.

However, the application No. 10-2004-0015907 discloses that the structure of the disclosed reactor is designed so that the wastewater flows simply between the cross-installed electrodes, so as to increase the contact rate between the wastewater and the electrodes. There is no choice but to increase the surface area as much as possible or slow the flow rate to lengthen the contact time.

However, if the flow rate of the wastewater passing through the reactor is slowed down, the wastewater treatment time becomes too long, and the wastewater throughput per hour decreases, and widening the electrode plate of the reactor is not an appropriate method because it increases the size of the reactor.

In addition, various types of aeration treatment such as packed towers, diffused aeration, tray aeration, and spray aeration are used to inject contaminated wastewater into volatile contaminants and air. There is a method of volatilizing and removing a substance such as ammonia by increasing the contact area of the liver.

Degassing is a method of transferring volatile contaminants from water to air, mainly used for groundwater purification, and is performed in packed towers or aeration tanks. In general, the packed tower degassing apparatus is provided with a spray nozzle for spraying contaminated wastewater on the upper part of the tower, and a fan is installed to counter the flow direction of water so that the air comes into contact with the sprayed wastewater. Drain the collected water at the bottom of the pump using a pump.

The main internal mechanism of this degassing technique is to increase the pH of the incoming sewage or wastewater to 11 or more to change the ammonium ion (NH ₄ ⁺ ) present in the water to molecules of ammonia (NH ₃ ) and then to air stripping. The tower contacts the air and blows it off in a gaseous state, mainly using lime to raise the pH of the incoming sewage. It is one of the most economical nitrogen removal methods, especially when precipitation of phosphorus by lime is required at the same time. However, when the temperature drops below zero, the treatment efficiency (appropriate temperature 20 ℃ or more) decreases, so it is difficult to apply in cold areas or winter seasons, odors occur, and scale is formed in the deaeration tower due to the lime used. There is a problem.

Accordingly, the present invention has been made in view of the problems of the prior art, the object of which is to install an aeration device in an electrolysis device that electrolyzes wastewater containing nitrogen components to quickly separate the nitrogen components and release them into the air. The present invention provides an electrolysis device for total nitrogen removal of waste water having an aeration device that maximizes wastewater treatment capacity due to electrolysis.

In order to achieve the above object, the present invention is a reactor housing for receiving waste water in order to electrolyze the incoming waste water; A plurality of electrode plates installed inside the housing to electrolyze waste water; Power supply means for applying a current to electrode plates provided at both ends of the plurality of electrode plates; Aeration means installed at an inner lower end of the housing to supply air for aeration; It provides an electrolysis device for total nitrogen removal of wastewater having an aeration device, characterized in that it comprises an air supply means for supplying air to the aeration means.

The plurality of electrode plates are installed to be in close contact with the lower surface of the reactor housing, each side end is in close contact with the opposite inner wall of the reactor in order to form a long flow path of the waste water. The electrode plate includes a positive electrode plate to which a direct current positive electrode is applied, a negative electrode plate to which a direct current negative electrode is applied, and a plurality of charging plates disposed between the positive electrode plate and the negative electrode plate.

The aeration means is formed by forming a groove on the upper surface of the bottom surface of the reactor housing, mounting a nozzle plate formed with a plurality of air nozzles on the bottom surface, the air supply connection is formed on one side.

Alternatively, the aeration means is composed of a plurality of pipes formed with a plurality of air nozzles are installed in the lower portion between the plurality of electrode plates, or a plurality of air nozzles are formed to have a structure such as the shape of the channel formed by the electrode plate And installed at the bottom of the reactor housing.

The air discharge hole formed in the aeration means has a diameter of 0.1 to 1.0 mm.

(Example)

Hereinafter, with reference to the accompanying drawings showing a preferred embodiment of the present invention described above in more detail.

Before describing the present invention, a schematic configuration of a wastewater treatment system using electrolysis will be described with reference to FIG. 1.

The wastewater generated from the wastewater generating source is collected in the collection tank 10 and supplied to the reservoir 15.

The reservoir 15 is to adjust the electrical conductivity of the wastewater to a predetermined reference value in order to electrolyze and discharge the wastewater, and to adjust the pH to the wastewater discharge standard, the electrolyte tank and pH regulator for supplying the electrolyte on the top The supplying pH regulator can be connected through each solenoid valve to maintain a predetermined electrical conductivity and pH.

And, the amount of wastewater stored in the reservoir 15 should always maintain a constant water level. That is, since the treatment of the wastewater is to be continuously processed, in order to maintain the electrical conductivity and pH of the wastewater at a constant value, the electrolyte and the pH adjuster have to be introduced in a constant amount corresponding to the amount of the wastewater introduced thereto. The level within) must be maintained within a certain range.

To this end, the reservoir 15 is provided with a water level sensor for detecting the upper and lower limits of the water level, and controls the pump to transfer the waste water from the water tank (10) to the reservoir (15).

The reactor 20 has a tank structure to receive wastewater from the reservoir 15 on one side and discharge it to the other side, as shown in FIGS. 2 to 5, and a plurality of electrode plates inside the reactor 20 ( 30) is installed.

The plurality of electrode plates 30 are provided at one end of the plurality of electrode plates 30 to which the positive voltage is applied, the negative plate 33 at the other end to which the negative voltage is applied, and the positive plate 31 and the negative plate 33. A plurality of first electrode plates 32 and second electrode plates 34 disposed between the anodes), a positive electrode terminal 35 for adding a direct current positive electrode to the positive electrode plate 31, and a direct current negative electrode is added to the negative electrode plate 33. And a negative electrode terminal 36.

One end of the positive electrode plate 31, the negative electrode plate 33 and the first electrode plate 32 is in close contact with the inner surface of the rear surface of the reactor 20, and the second electrode plate 34 is opposite to the reactor 20. It is in close contact with the front inner surface.

As described above, when one end of the plurality of electrode plates is in close contact with the inner surface of the front and rear of the reactor 20, respectively, as shown in Figure 3, the water channel is formed in a zigzag form between the inlet 21 and outlet 22 This has the advantage of increasing the length of the channel.

Therefore, the wastewater introduced through the inlet 21 is introduced between the first and second electrification plates 34 of the positive electrode plate 31 and the second electrification plate 34 and sequentially the first electrification plate 32 and the first It is discharged to the outlet 22 while moving along the zigzag-shaped channel formed by the two electric plates 34.

The power supplied to the electrode plate 30 having the structure as described above is preferably applied to the voltage from the constant voltage power supply, the reason is that as the operation is started, the waste water flows into the reactor 20 to the normal level When the water level of the reactor 20 is lowered when it is high and when the operation is completed, the current is applied in accordance with the amount of waste water present in the reactor 20 to maintain a constant decomposition rate of the waste water.

In addition, the positive electrode plate 31 and the negative electrode plate 33 are disposed at both ends as described above, and the first electrode plate 32 and the second electrode plate 34 are disposed in the middle thereof. When the direct current positive and negative electrodes are applied to only (33), negative charges are charged on the corresponding surface of the first second electrode plate 34 adjacent to the positive plate 31, and positive charges are charged on the opposite side thereof. A negative charge is again charged on the corresponding surface of the first first electrically charged plate 32, and a positive charge is charged on the opposite surface thereof, and in this manner, the last of the second second electrically charged plate 34 adjacent to the negative electrode plate 33 is formed. A positive charge is charged on the corresponding surface.

Therefore, since the positive or negative charges are alternately charged between the positive electrode plate 31 and the negative electrode plate 33, and the first electrode plate 32 and the second electrode plate 34, the wastewater passing through the channels formed by them. Can be electrolyzed.

Meanwhile, a groove 41 through which air can be supplied is formed in the reactor lower surface 40 at the bottom of the reactor 20, and a plurality of nozzles are formed on the reactor lower surface 40 on which the groove 41 is formed. The nozzle plate 42 in which the 43 was formed is mounted.

In addition, one side of the reactor bottom surface 40 is equipped with an adapter 44 formed in the air flow path therein, the connection portion 45 formed on one side of the adapter 44 is compressed from the air pump 50 Air is supplied at a constant flow rate by the flow regulator 52.

The air supplied into the reactor 20 through the nozzle 43 should be supplied in a constant amount in accordance with the amount of wastewater contained in the reactor 20, and the size of the bubbles discharged should be uniformly discharged. do.

To this end, in the present invention, the flow rate of the flow regulator 52 is controlled through the controller 60 in consideration of the pressure of the air discharged from the air pump and the amount of waste water accommodated in the reactor 20.

In addition, in the embodiment of the present invention, the structure for supplying air into the reactor 20 is implemented through the nozzle plate 42 having the nozzle lower surface 40 and the reactor 43 having the groove 41 formed therein. In some cases, the pipe in which the nozzle is formed may be processed into at least one in a zigzag form such as a channel formed by the electrode plate 30, and installed at the bottom of the reactor 20.

Since the diameter of the nozzle 43 is a factor for determining the size of the discharged air bubbles, the nozzle 43 is preferably 0.1 to 1.0 mm for optimum aeration. This is because, if it is smaller than 0.1 mm, the surface area of the total bubble becomes too large to interfere with the contact between the wastewater and the electrode. If it is larger than 1.0 mm, the surface area of the total bubble is too small to obtain sufficient stirring effect. Therefore, it is most preferable to form the nozzle 43 with a diameter of about 0.5 mm.

In addition, the amount of air supplied through the nozzle 43 is preferably supplied at a ratio of about 1 to 3 with respect to the amount of waste water. As described above, the waste water in the state where the diameter of the nozzle 43 is about 0.5 mm is made. If it is supplied in an amount less than 1 times, the sufficient stirring effect cannot be obtained, and if it is supplied in an amount more than 3 times, the amount of air bubbles is too high, which interferes with the contact between the wastewater and the electrode, resulting in a decrease in electrolysis efficiency. Because it works.

Looking at the electrolysis performance of the waste water by the air supply means installed inside the reactor 20 for aeration as described above.

Table 1 shows the decomposition efficiency according to aeration when electrolysis is performed using an electrolysis device for total nitrogen removal of wastewater having an aeration device according to the present invention.

number Condition Starting pH value Initial TN Concentration (ppm) 10 minutes (ppm) 20 minutes (ppm) 30 minutes (ppm) Final decomposition rate One Electrolysis 8.12 545.4 368.8 247.26 151.2 72.3% 2 Electrolysis + aeration 8.12 525.4 359.65 173.31 76.28 85.5% 3 Electrolysis + aeration 8.12-> 8 ~ 9 525.4 376.65 157.56 58.04 89.0% 4 Electrolysis + aeration 8.12-> 9 ~ 10 525.4 294.5 132.66 51.98 90.1% 5 Electrolysis + aeration 8.12-> 10 ~ 11 525.4 331.1 165.66 60.12 88.6%

As shown in Table 1 and Figure 7, it can be seen that the decomposition rate when the electrolysis and aeration of the two to five times than the treatment only in one electrolysis condition, and the decomposition rate is of course different depending on the pH of the waste water In order to increase the decomposition rate, it is necessary to maintain the optimum pH according to the type of waste water.

Through the above results, supplying air to the electrolyzer may be judged to increase the electrolysis rate by maintaining the electrical conductivity and pH uniformly since the agitation of the wastewater during electrolysis may occur. It can be seen that the air bubbles attached to 30 are removed to enlarge the effective area of the electrode plate.

In addition, the nitrate nitrogen contained in the waste water is converted to ammonia through nitrous nitrogen, and reacted with the chlorine ions produced by chlorine generated in the negative electrode plate to be converted into nitrogen gas and released into the atmosphere.

In this process, efficiency is improved because ammonia is blown into the air by aeration before it meets secondary chlorine ions.

And, as described above, it can be observed that the electrolysis efficiency is improved when the pH is high, and this result supports the fact that ammonia is removed by aeration.

The present invention made as described above significantly increases the electrolysis efficiency by supplying air into the electric reactor during the electrolysis treatment of the total nitrogen contained in the wastewater polluting the water quality.

In addition, aeration during electrolysis provides an effect of increasing the wastewater throughput per unit time.

In the above, the present invention has been illustrated and described with reference to specific preferred embodiments, but the present invention is not limited to the above-described embodiments and the general knowledge in the technical field to which the present invention pertains without departing from the spirit of the present invention. Various changes and modifications will be made by those who possess.

Claims (6)

A sump for storing waste water; A container for storing the wastewater supplied from the sump tank, comprising a pH sensor for detecting the pH of the wastewater, and a water level sensor for sensing the level of the wastewater, the upper end of which is capable of electrolyzing the electrical conductivity of the wastewater An reservoir for supplying an electrolyte for supplying an electrolyte for maintaining conductivity, and a pH adjuster for supplying a pH adjuster for adjusting the pH of the wastewater to a dischargeable pH through a solenoid valve; An electrolyzer comprising a positive electrode plate to which a positive pole DC current is applied, a negative electrode plate to which a negative pole DC current is applied, and a plurality of charging plates disposed between the negative electrode plate and the negative electrode plate; A reactor for each end of which is in close contact with the other side of the inner side of each other so as to form a zigzag waterway so as to electrolyze the wastewater supplied from the reservoir while passing through the waterway; Power supply means for applying a current to electrode plates provided at both ends of the plurality of electrode plates; Aeration means installed at an inner lower end of the housing to supply air for aeration; Electrolysis device for total nitrogen removal of waste water having an aeration device, characterized in that the air supply means for supplying air to the aeration means. delete delete The method of claim 1, wherein the aeration means is formed with a groove on the upper surface of the bottom surface of the reactor housing, the nozzle plate on which a plurality of air nozzles are formed is mounted on the bottom surface, characterized in that the air supply connection is formed on one side thereof Electrolysis device for total nitrogen removal of wastewater provided with an aeration device. 2. The electrolytic apparatus of claim 1, wherein the aeration means comprises a plurality of pipes formed with a plurality of air nozzles and is installed below the plurality of electrode plates. . According to claim 1, wherein the aeration means is formed of a plurality of air nozzles are formed in the same structure as the shape of the channel formed by the electrode plate is installed on the bottom of the reactor housing, characterized in that the aeration device Electrolysis device for total nitrogen removal.

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