KR101543551B1 - Wastewater treatment system using electrolysis - Google Patents

Wastewater treatment system using electrolysis Download PDF

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KR101543551B1
KR101543551B1 KR1020150060479A KR20150060479A KR101543551B1 KR 101543551 B1 KR101543551 B1 KR 101543551B1 KR 1020150060479 A KR1020150060479 A KR 1020150060479A KR 20150060479 A KR20150060479 A KR 20150060479A KR 101543551 B1 KR101543551 B1 KR 101543551B1
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South Korea
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tank
electrolysis
treatment system
wastewater
iron
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KR1020150060479A
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Korean (ko)
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송영일
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주식회사 케이엔씨
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    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
    • C02F1/461—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis
    • C02F1/46104—Devices therefor; Their operating or servicing
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
    • C02F1/54—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using organic material
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00—Biological treatment of water, waste water, or sewage
    • C02F3/30—Aerobic and anaerobic processes
    • C02F3/302—Nitrification and denitrification treatment

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  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Water Supply & Treatment (AREA)
  • Hydrology & Water Resources (AREA)
  • Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Organic Chemistry (AREA)
  • Microbiology (AREA)
  • Biodiversity & Conservation Biology (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Water Treatment By Electricity Or Magnetism (AREA)
  • Separation Of Suspended Particles By Flocculating Agents (AREA)

Abstract

The present invention relates to an advanced treatment system for wastewater and wastewater using an electrolysis process, more specifically, to a method for removing nitrogen by nitrification and denitrification in a biological reactor composed of an anoxic tank and an aerobic tank, The present invention relates to a sewage / wastewater treatment system using electrolysis, which removes phosphorus, adds coagulant, and further installs an electrolysis tank.
Therefore, the waste water and wastewater treatment system using electrolysis can remove the residual contaminants that have not been removed in the sewage treatment using the conventional electrolysis using a flocculant, and further install electrolysis using a potential difference to remove viruses and pathogenic bacteria, And an additional anaerobic tank can be installed to further increase the phosphorus removal efficiency.

Description

[0001] Wastewater treatment system using electrolysis [0002]

The present invention relates to an advanced treatment system for wastewater and wastewater using an electrolysis process, more specifically, to a method for removing nitrogen by nitrification and denitrification in a biological reactor composed of an anoxic tank and an aerobic tank, The present invention relates to a sewage / wastewater treatment system using electrolysis, which removes phosphorus, adds coagulant, and further installs an electrolysis tank.

Generally, the domestic sewage treatment facility uses standard activated sludge method or the modified or modified method of the above method, and the removal efficiency of nutrients according to it is less than 20%. In order to comply with the water quality standard being strengthened, It is inevitable to introduce a processing method.

The A 2 / O process, UCT process, and VIP process, which are applied in foreign countries, are not applied due to the low concentration of organic substances due to the combined sewage exclusion system in Korea, and about 78% However, the amount of sewage treated by actual sewage treatment facilities is estimated to be less than the actual sewage treatment facilities due to lack of sewerage maintenance and lack of sewage treatment facilities. In addition, the wastewater produced in small areas, livestock wastewater, Wastewater generated in industrial complexes or factories is discharged directly to the water system due to lack of facilities or absence of treatment facilities.

In general, the conventional method of treating wastewater is carried out mainly on physical treatment, chemical treatment and biological treatment, and physical treatment is a method of separating solid matter from wastewater by gravity from liquid or by other physical methods . Chemical treatments are chemical treatments such as neutralization or pH adjustment, redox treatment, coagulation sedimentation, adsorption, etc. by adding chemical agents to the wastewater. This is due to the increase in chemical cost and sludge generation In order to compensate for the disadvantages of the physico-chemical method, the biological advanced treatment method is applied. However, in case of the biological advanced treatment method, the treatment efficiency is greatly influenced by the concentrations of the organic matters and the nutrients in the influent water , And thus the reliability of the nutrient removal rate by the active microorganisms is low.

In order to solve the above problems, an electrolytic apparatus is studied and installed. Prior arts using the electrolysis are Korean Patent No. 10-1306980, which is a water treatment apparatus including a biological reaction process, And electrolytic means for electrolyzing the water to be treated so as to supply iron ions to the water to be treated, wherein the electrolytic means comprises an electrolytic bath passing through the water to be treated flowing into the aerobic tank and an electrolytic bath, And a power supply unit for supplying power to the electrode unit, wherein the steel plate of the electrode is annealed for 3 hours and then heat-treated, thereby providing a water treatment apparatus using iron electrolysis.

In addition, Korean Patent No. 10-0490307 discloses an electrolytic cell in which an influent water supply unit that supplies inflow water treated in an oxic tank to an iron electrolytic cell, an air supply unit that supplies external air, an iron electrolytic cell that electrolyzes the incoming process water, There is provided an iron-electrolytic apparatus for wastewater treatment, comprising an oxic tank supply unit for supplying the treated water to the oxic tank, and a gas discharge unit for discharging brown gas generated by electrolysis.

Conventional electrolysis and other existing advanced wastewater and wastewater treatment processes are difficult to install in a small space and the process is operated with an emphasis on removing phosphorus in wastewater and the discharge of residual pollutants is avoided And there is a problem that the bactericidal action of viruses and hospital bacteria in the treated water is small.

Korean Registered Patent No. 10-1306980 (2013.09.04.) Korean Patent No. 10-0490307 (2005.05.10.)

The present invention relates to a treatment facility facility capable of removing residual pollutants in the treatment of wastewater and wastewater using conventional electrolysis processes as described above, and capable of installing treatment facilities in small-scale and small-scale facilities having few sites, It is an object of the present invention to provide a sewage / wastewater treatment system using an electrolysis process capable of solving the problem of pathogenic bacteria and viruses such as super bacteria found in a sewage treatment plant.

In order to solve the above-mentioned problems and to achieve the object, the electrolytic wastewater treatment system of the present invention comprises an anoxic tank 10, an electrolysis tank 20, an aerobic tank 30 and a settling tank 50, The anoxic tank (10) receives the wastewater containing nitrate nitrogen generated through the nitrification process in the aerobic tank (30) through an internal transportation process and performs denitrification treatment, and the nitrogen gas generated by the denitrification process is discharged to the atmosphere The electrolysis tank 20 dissolves phosphorus using electrolysis. The oxic tank 30 performs a nitrification process in which ammonia in the influent water is oxidized to become nitric acid, and a process in which the dissolved phosphorus is removed, The sedimentation tank 50 removes residual residues and coagulates and removes fine suspended particles (SS) by injecting the flocculant 40 into the sedimentation tank 50 to carry out sludge transportation and solid-liquid separation of suspended particles, Is acetic acid (CH 3 COOH) was added to the aggregation can be promoted continues to maintain the high salt airway.

The electrolytic bath (20) reacts with the dissolved oxygen in the electrolytic reaction tank while the divalent iron ions generated on the surface of the iron (Fe) electrode of the anode move to the surface of the iron electrode of the cathode according to the current flow in the aqueous solution, The iron is oxidized and phosphorus is removed to remove phosphorus.

Acetic acid (CH 3 COOH) in the mixture of the flocculant (40) increases the adsorption force of fine particles in water when a hydrogen ion and a hydroxyl ion bind to each other to cause a neutralization reaction.

An electrolytic bath (25) using a potential difference before the flocculant (40) is introduced is used to remove viruses and bacteria in the wastewater.

The positive electrode of the electrolytic cell using the potential difference is provided with titanium dioxide (27) doped with bismuth, and the negative electrode is provided with stainless steel (29).

The anoxic tank (10) is provided with two anoxic tank (1) and anoxic tank (2). In the wastewater treatment system, the anaerobic tank (5) is installed in the anoxic tank (10)

As described above, the waste water treatment system using electrolysis according to the present invention removes the residual contaminants that have not been removed in the sewage treatment using the conventional electrolysis using a flocculant, and further installs electrolysis using a potential difference Viruses and pathogenic germs are removed and discharged into the water system, and further anaerobic digestion can be installed to further increase the phosphorus removal efficiency.

FIG. 1 is a process diagram showing a waste water treatment system using electrolysis according to the present invention.
FIG. 2 is a process example showing a waste water treatment system using electrolysis in which an electrolytic bath according to the present invention is additionally provided.
3 is a basic response diagram of an additional installed electrolytic bath according to the present invention.
FIG. 4 is a process diagram showing a wastewater treatment system using electrolysis in which an anaerobic tank according to the present invention is additionally provided.

The present invention will be described in detail with reference to the accompanying drawings, wherein like reference numerals are used to refer to like elements throughout the specification. Also, the terms defined in the present specification and claims should not be construed as limiting, but may be changed according to the intention or custom of the operator, and interpreted in terms of meaning and concept consistent with the technical idea of the present invention.

In one aspect of the present invention,

FIG. 1 is a process diagram showing a waste water treatment system using electrolysis according to the present invention. FIG. 2 is a view showing a waste water treatment system using electrolysis in which an electrolytic bath 25 according to the present invention is additionally provided. FIG. 3 is a basic reaction diagram of an additional electrolytic cell according to the present invention, and FIG. 4 is a process diagram showing a wastewater treatment system using electrolysis in which an anaerobic tank 5 according to the present invention is additionally provided.

As shown in FIG. 1, the waste water treatment system using electrolysis includes an anoxic tank 10, an electrolytic tank 20, an aerobic tank 30, and a sedimentation tank 30, (50), wherein the anoxic tank (10) is supplied with the nitrate nitrogen-containing wastewater generated through the nitrification process in the aerobic tank (30) through an internal transportation process and is subjected to denitrification treatment, The anoxic tank (10) is provided with two anoxic tank (1) and anoxic tank (2). The electrolytic tank (20) dissolves phosphorus by electrolysis, and the electrolytic bath (20) The bivalent iron ion generated on the surface of the iron (Fe) electrode of the anode moves to the surface of the iron electrode on the cathode according to the flow of current in the aqueous solution and reacts with the oxygen in the electrolytic tank to oxidize the trivalent iron, Phosphorus is removed and the aerobic tank 30 performs a nitrification process in which ammonia in the influent water is oxidized to become nitric acid and a process in which the eluted phosphorus is removed. The settling tank 50 performs sludge transportation and solid-liquid separation of suspended particles The coagulant 40 is injected into the sedimentation tank 50 to remove residual particles and coagulate and remove the suspended particles SS. The coagulant 40 is concentrated to remove coagulant 40, (CH 3 COOH) is added, and the acetic acid (CH 3 COOH) increases the adsorption power of fine particles in the water when hydrogen ions and hydroxyl ions are combined to cause a neutralization reaction.

The mechanism of metal hydroxide formation when an iron electrode is used as an electrochemical oxidation method for allowing iron to be precipitated by passing current through DC / DC converter on the surface of the iron plate mounted on the iron deposition apparatus of the electrolytic bath 20 is as follows .

Fe → Fe 2 + + 2 e-

Fe 2 + - > Fe 3 + + 3e -

4OH - > 2H 2 O + O 2 + 4e -

(Anode)

H 2 O → H + + OH -

Fe 3 + + PO 4 3 - > FePO 4 ↓

FE 3 + + 3H 2 O -> Fe (OH) 3 ↓ + 3H +

(Cathode)

The generated iron salts and phosphorus in the reaction tank are adsorbed and removed on the iron oxide, and treatment can be performed irrespective of the phosphorus removal rate and the phosphorus concentration, which is faster than biological removal.

Experimental Example  : Phosphorus removal efficiency

The dose of KH 2 PO 4 was adjusted from 39.2 to 19.5 mg / l, and no iron electrode plate was used in the fourth step. It was shown that the phosphorus removal rate in the electrolysis tank using iron was higher and the iron concentration was higher as the phosphorus load was higher.

number 1 No.2 number 3 No. 4 Load mg / l 39.2 30.1 19.5 19.5 PO4-P Effluent 3.2 3.0 2.6 16.5 R.E. (%) 84.6 85.2 89.2 23.9 Iron concentration mg / l 55.1 60.9 78.3 none HRT / SRT hr / day 8/6 8/6 8/6 8/6

The anode of the electrolytic bath 20 may be replaced with an aluminum material.

Further, in the method for producing the acetic acid-added flocculant 40,

(a) 30 to 70 parts by weight of aluminum hydroxide (Al (OH) 3 ), 10 to 40 parts by weight of hydrochloric acid (HCl) and 2 to 32 parts by weight of acetic acid (CH 3 COOH)

(b) mixing the primary mixture, dolomite, limestone, and active quartz sand powders obtained in step (a) in a weight ratio of 1: 0.5 to 2: 0.1 to 2: 00.5 to 2 Step

(c) heating the mixed mixture obtained in steps (a) and (b) to a temperature of 50 to 60 ° C under a pressure of 10 to 300 kgf /

(d) adding 5 to 25 parts by weight of caustic soda (NaOH) having a sodium oxide (Na 2 O) concentration of 10 to 40% to 100 parts by weight of aluminum hydroxide (AlOH 3 ) And mixing

(e) stirring the mixed mixture in the step (d) for a predetermined period of time

(f) reacting the agitated mixture in the step (e) at a temperature of 120 to 200 ° C for 3.5 to 12 hours

(g) cooling the reaction product to a temperature of 30 to 40 DEG C in step (f)

If the content of acetic acid is below the set range, the adsorption function with the metal and the insoluble phosphorus compounds, phosphorus, nitrogen and the like is deteriorated. If the acetic acid is above the set range, the generated flakes harden and the amount of generated sludge becomes large There is a drawback that it is not preferable. A flocculant is prepared by the above method.

Experimental Example  : Coagulation characteristic test

The flocculant composition was treated at a final concentration of 20 mg / l in the raw water collected at the S sewage terminal treatment plant in Gwangju Metropolitan City and the raw water and treated water were treated at a rate of 250 rpm for about 1 minute using a Jar-tester The mixture was rapidly stirred and stirred at 30 rpm for 30 minutes, and then allowed to stand for 30 minutes. Then, the raw water and treated water were collected and the basicity, turbidity and pH thereof were measured. For comparison, commercially available polychlorinated aluminum (PAC) was used. The results are shown in Table 2 below.

Test Items Before processing (raw water) After treatment (present invention) (Comparative Example) unit basicity 40 52 43 % Turbidity 1.254 0.802 0.957 NTU pH 5.3 7.2 6.7 -

Aluminum hydroxide (Al (OH) 3 ) may be used instead of other compounds in the aluminum (Al) salt state. Such compounds include, for example, aluminum chlorohydrate, aluminum chloride, polyaluminum chloride, and the like.

In addition, the flocculant 40 of the present invention can improve the removal effect of organic matter in the water treatment by improving the size of the flocculant and improve the flocculation speed by preparing a water treatment agent coagulant by mixing and reacting the components in an appropriate amount under proper conditions. .

Furthermore, it is possible to maintain stable and highly saline air intakes by improving the problems of monomolecular and low molecular weight or low basicity products, which are disadvantages of conventional aluminum-based and iron-salt-based inorganic flocculants of the present invention, It is possible to produce a water treatment agent coagulant having high efficiency.

As shown in FIG. 2, an electrolytic bath 25 using a potential difference before the coagulant 40 is introduced to remove viruses and bacteria from the wastewater.

As shown in FIG. 3, the anode of the electrolytic bath 25 using the potential difference is provided with titanium dioxide 27 doped with bismuth, and the cathode is provided with stainless steel 29.

Therefore, the hydroxy radical generated by the added electrolytic bath 25 removes various organic pollutants in the wastewater and the oxygen radical including the hydroxyl radical is removed from the chlorine anion (Cl - ) contained in the wastewater, To produce reactive-chloride species to kill viruses and pathogenic bacteria in the water.

As shown in FIG. 4, in the wastewater treatment system, the anaerobic tank 5 may be installed in the anoxic tank before the anaerobic tank to increase the phosphorus removal rate.

In addition, depletion of water resources and deterioration of water quality are continued, and advanced water treatment technology using a membrane separation device can be added in accordance with the quality of the government. In detail, regarding the installation of the membrane separation device, A method of separating sludge and treated water by a filtration membrane or an ultrafiltration membrane or immersing the MF membrane directly in an anoxic tank 10 or an oxic tank 30 for suction and filtration can be used.

The membrane separation facility can be used in the hospital microbial countermeasures against domestic sewage containing manure, and in the upgrading treatment by the nitrogen-phosphorus removal measures. Furthermore, in recent years, not only the toxic red tide but also the WHO (World Health Organization) It is possible to solve the problem of toxic cyanobacteria which is abnormally proliferated due to nitrogen and phosphorus as microcystin, which is a toxin stronger than cyanide, is produced.

The present invention can treat sewage or wastewater by advanced treatment directly to the aquatic system or recycle the sewage or wastewater to wash water or grow crops on the other hand.

While the present invention has been described with reference to the particular embodiments and drawings, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, Various modifications and variations are possible.

5: Anaerobic tank 29: Stainless steel
10: anoxic tank 30: aerobic tank
20: Primary electrolysis 40: Coagulant
25: secondary electrolysis 50: settling tank
27: BiOx / TIO 2

Claims (7)

In the wastewater treatment system,
The sewage / wastewater treatment system is composed of an anoxic tank, an electrolysis tank, an aerobic tank, and a settling tank,
Wherein the anoxic tank receives denitrification treatment of wastewater containing nitrate nitrogen produced through a nitrification process in the aerobic tank through an internal transportation process and discharges nitrogen gas generated by the denitrification process into the atmosphere,
Wherein the electrolytic bath is formed by eluting phosphorus using electrolysis,
Wherein the aerobic tank performs a nitrification process in which ammonia in the influent water is oxidized to become nitric acid and a process in which the dissolved phosphorus is removed,
The settling tank performs sludge transportation and solid-liquid separation of suspended particles,
(CH 3 COOH) is added so that coagulation is promoted and the high salt air is continuously maintained, and the coagulant is added to the flocculant, , 30 to 70 parts by weight of aluminum hydroxide (Al (OH) 3 ), 10 to 40 parts by weight of hydrochloric acid (HCl) and 2 to 32 parts by weight of acetic acid (CH 3 COOH) The mixture is mixed with dolomite, limestone and activated silica powder at a weight ratio of 1: 0.5 to 2: 0.1 to 2: 0.5 to 2 and heated to 50 to 60 ° C under a pressure of 10 to 300 kgf / cm 2 And then 5 to 25 parts by weight of caustic soda (NaOH) having a sodium oxide (Na 2 O) concentration of 10 to 40% is injected and mixed with 100 parts by weight of aluminum hydroxide (AlOH 3 ) The resulting mixture was cooled at a temperature of 120 to 200 ° C for 3.5 to 12 hours and then cooled to 30 to 40 ° C. It said acetate in the mixture of the coagulant (CH 3 COOH) is to wastewater treatment system using the electrolysis, characterized in that to increase the suction force of the water microparticles of time to cause a neutralization reaction to combine hydrogen ions and hydroxide ions. The method according to claim 1,
The electrolytic bath
The bivalent iron ions generated on the surface of the iron (Fe) electrode of the anode move to the surface of the iron electrode of the cathode according to the flow of current in the aqueous solution and react with dissolved oxygen in the electrolytic reaction vessel to oxidize the trivalent iron, Wherein the electrolytic water is removed from the waste water treatment system. delete The method according to claim 1,
Wherein an electrolytic bath using the potential difference before the coagulant is charged is used to remove viruses and bacteria in the wastewater. 5. The method of claim 4,
Wherein the anode of the electrolytic cell using the potential difference is made of titanium dioxide doped with bismuth and the anode is made of stainless steel. The method according to claim 1,
Wherein the anoxic tank is provided with two anoxic tank (s) 1 and an anoxic tank (s) 2. The method according to claim 1,
Wherein the anaerobic tank is installed in the anhydrous wastewater treatment system in the anoxic tank prior to the anoxic tank so that the phosphorus removal rate can be increased.
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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101682581B1 (en) * 2016-06-28 2016-12-05 주식회사 동아기술공사 Non-point sources including rainwater treatment system
WO2018230998A1 (en) * 2017-06-15 2018-12-20 한국지질자원연구원 System and method for treating underground water synthetically contaminated by heavy metal and microorganism
KR101961105B1 (en) 2018-06-12 2019-03-25 주식회사 케이엔씨 Foul water treatment method using submerged membrane and electrolysis tank
KR101961107B1 (en) 2018-06-12 2019-07-17 주식회사 케이엔씨 Method for removing nitrogen and phosporus using high-frequency reactor
KR102142882B1 (en) 2019-10-30 2020-08-10 송영일 PROCESS AND APPARATUS FOR REMOVING NITROGEN AND PHOSPORUS USING Fe ELECTROLYSIS AND OZON

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005118675A (en) * 2003-10-16 2005-05-12 National Institute Of Advanced Industrial & Technology Coagulant
US20100276294A1 (en) * 2003-03-28 2010-11-04 Lambie John M Electrolytic sanitization of water
KR101370395B1 (en) * 2013-05-27 2014-03-07 김성철 Sewage and wastewater advanced treatment methods using caterpillar-type electrolysis system

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20100276294A1 (en) * 2003-03-28 2010-11-04 Lambie John M Electrolytic sanitization of water
JP2005118675A (en) * 2003-10-16 2005-05-12 National Institute Of Advanced Industrial & Technology Coagulant
KR101370395B1 (en) * 2013-05-27 2014-03-07 김성철 Sewage and wastewater advanced treatment methods using caterpillar-type electrolysis system

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101682581B1 (en) * 2016-06-28 2016-12-05 주식회사 동아기술공사 Non-point sources including rainwater treatment system
WO2018230998A1 (en) * 2017-06-15 2018-12-20 한국지질자원연구원 System and method for treating underground water synthetically contaminated by heavy metal and microorganism
KR101961105B1 (en) 2018-06-12 2019-03-25 주식회사 케이엔씨 Foul water treatment method using submerged membrane and electrolysis tank
KR101961107B1 (en) 2018-06-12 2019-07-17 주식회사 케이엔씨 Method for removing nitrogen and phosporus using high-frequency reactor
KR102142882B1 (en) 2019-10-30 2020-08-10 송영일 PROCESS AND APPARATUS FOR REMOVING NITROGEN AND PHOSPORUS USING Fe ELECTROLYSIS AND OZON

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