KR20160069040A - Method for treating recycle water of wastewater treatment - Google Patents

Abstract

The present invention provides a method for treating recycle water generated in a wastewater treatment process, which is configured to collect recycle water generated in a wastewater treating process, to remove phosphorous using reduction slag in a fluidized bed reactor (FBR), to perform advanced oxidation processes on non-biodegradable organic material included in the phosphorous-free recycle water in advanced oxidation processes (AOP), and to return the recycle water, obtained by biologically/physically treating the advanced oxidation-treated recycle water in a membrane bioreator (MBR), to a bioreactor tank or a grit chamber, thereby enabling the recycle water to be retreated. The method for treating recycle water according to the present invention does not generate impact load in a water treating process.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a method for treating a wastewater,

It is possible to collect reflux water from the sewage treatment process, remove phosphorus from the reduced slag from the FBR (Fludized Bed Reactor), and recover the refractory organics contained in the phosphorus removal water from the AOP (Advanced oxidation processes) Oxidation treatment, and biologically / physically treating the highly oxidized untreated water in the MBR (Membrane Bioreactor) to be recycled to the bioreactor or gypsum to be reprocessed.

In general, phosphorus, which is contained in a large amount in wastewater, exists in the form of inorganic phosphate and organic phosphate (phytate). In the case of animals such as a human being (pig, chicken) In the form of a salt, a large amount of phosphorus exists in the wastewater, and in the case of inorganic phosphorus, it is discharged through a detergent or the like, but exists as stable particles, and phosphorus in the ionic state is rapidly converted into a salt form It is.

)은 미생물이 쉽게 이용할 수 있는 관계로, 인이 함유된 오, 폐수가 하천 및 해양으로 배출될 경우에는 상기 미생물에 의한 부영양화 현상(Eutrofication)을 유발시켜, 녹조와 적조 등의 발생에 심각한 영향을 미치게 되는 것이다.As described above, phosphorus (phosphate, phosphate,

) Can be easily used by microorganisms. When ozone-containing wastewater is discharged into rivers and oceans, it causes eutrophication caused by the microorganisms, thereby causing serious effects on the occurrence of green tide and red tide. It is going to go crazy.

)을 제거하는 방법으로서 생물학적 제거방법, 응집-침전법, 결정법, 흡착법 등이 널리 알려져 있으며, 이중 생물학적 인의 제거방법은 그 처리효율이 낮은 단점이 있는 것이다.As described above, in the water treatment process of the wastewater, the phosphate present in the water

A biological removal method, a coagulation-sedimentation method, a crystallization method, an adsorption method, and the like are widely known, and a biological phosphorus removal method has a disadvantage that its treatment efficiency is low.

In addition, the biological removal method and the flocculation-precipitation method require a large installation area for removal of phosphorus, and a large amount of sludge is generated and recovery of removed phosphorus is also difficult.

In recent years, however, there has been a problem in that, since the reflux water containing raw sludge and excess sludge filtered in the wastewater purification system is introduced into the inside of the phosphorus adsorption tank and adsorbed phosphorus and phosphorus are recovered through the adsorbent filled in each chamber of the phosphorus adsorption tank A phosphorus adsorption and recovery system capable of discharging treated water and reusing the phosphorus adsorption film is known in Korean Patent Registration No. 10-1108877.

In the above-mentioned prior art, the adsorbent is filled in each chamber of the phosphorus adsorption tank in which the raw water sludge filtered by the waste water purification system and the excess sludge including the excess sludge are respectively introduced, adsorbing the phosphorus contained in the sludge surplus sludge And the phosphorus adsorbed treated water is discharged to the phosphorus desorption tank through a discharge pipe. The phosphorus desorption tank communicates with the phosphorus adsorbent flow tube to introduce adsorbed phosphorus into the phosphorus desorption tank, and then the phosphorus adsorbed adsorbent The adsorbed phosphorus is desorbed by desorbing solution (NaOH, Na2CO₃), and the solution containing phosphorus is flowed to the phosphorus recovery vessel through the phosphorus flow tube, and phosphorus desorbed adsorbent is adsorbed to the adsorbent regeneration vessel So that the phosphorus can be recovered and the adsorbent can be regenerated while discharging the treated water, and the regenerated adsorbent can be recovered through the recovery pipe It comprises a configuration in which material flows twos adsorption.

However, in the case of the above-mentioned phosphorus adsorption and recovery system, regardless of the phosphorus concentration of the reflux water, the phosphorus adsorption and recovery system merely adsorbs through the adsorbent filled in each chamber of the phosphorus adsorption tank. The use of the adsorbent for phosphorus adsorption is increased and the adsorption efficiency of phosphorus due to the phosphorus adsorbed adsorbent being simply desorbed and then used again is extremely lowered, (NaOH, Na2CO3), and the generation of high-concentration wastewater generated during desorption.

The present invention relates to a method for recovering reflux water generated in a sewage treatment process in a form of crystallization such as hydroxyapatite by using a reducing slag (LF Slag) in a FBR (Fludized Bed Reactor) , Advanced oxidation processes (AOP), high oxidation treatment of refractory organisms contained in the reflux water, and optionally biologically / physically treated reflux water treated with highly oxidized MBR (Membrane Bioreactor) The present invention also provides a method of treating a reflux water generated in a sewage treatment process that does not cause an impact load during a water treatment process by recirculating it to a reaction tank or a gypsum.

) 형태의 인을 제거하는 단계와, 상기 FBR(Fludized Bed Reactor)부에서 인산염(

) 형태의 인이 제거된 반류수를 AOP(Advanced oxidation processes)부로 반송하여, 상기 AOP(Advanced oxidation processes)부에서는 반류수에 오존을 공급하므로써, 고분자의 난분해성 유기물을 생분해성 유기물로 저분자화 되도록, 반류수에 포함된 유기물을 고도 산화 처리하는 단계, 및 상기 AOP(Advanced oxidation processes)부에서 유기물이 고도 산화 처리된 반류수를 생물학반응조로 반송하는 단계를 포함한다.A method of treating a reflux water generated in a sewage treatment process according to the present invention comprises the steps of removing foreign substances contained in sewage water using a specific gravity in a gypsum; Removing the suspended solids contained in the sewage in the first sedimentation tank by primary precipitation; Releasing phosphorus contained in the sewage, denitrifying the nitrate, treating the microorganism in the order of oxidation, nitrification and phosphorus accumulation of the organic matter; Removing the suspended solids contained in the sewage in the second sedimentation tank by secondary precipitation; Aggregating suspended matter, organic matter, and microbial particles contained in sewage in a coagulating sedimentation facility with a flocculant; Supplying ozone to sewage in an ozone treatment facility and deodorizing the ozone; And discharging the mixed sludge to the mixed sludge by discharging it to the mixed sludge by concentrating the excess sludge returned from the second settling tank to the concentrated sludge, Collecting the reflux water containing dehydrated filtrate generated by dewatering the mixed sludge into a storage tank when discharging the mixed sludge conveyed from the concentrator to the dehydrating dehydrator and discharging the dehydrated water to the cake; Fludized Bed Reactor (FBR), and the phosphate contained in the reflux water is recovered by crystallization of hydroxyapatite in the FBR (Fludized Bed Reactor)

Removing phosphorus in the Fludized Bed Reactor (FBR) portion;

) Is returned to the Advanced oxidation processes (AOP) section, and the AOP (Advanced oxidation processes) section supplies ozone to the reflux water so that the degradable organic material of the polymer is reduced to a biodegradable organic material , An elevated oxidation treatment of the organic substances contained in the reflux water, and a step of returning the reflux water in which the organic matter is highly oxidized in the AIP (Advanced oxidation processes) section to the biological reactor.

) 형태의 인을 제거하는 단계와, 상기 FBR(Fludized Bed Reactor)부에서 인산염(

) 형태의 인이 제거된 반류수를 AOP(Advanced oxidation processes)부로 반송하여, 상기 AOP(Advanced oxidation processes)부에서는 반류수에 오존을 공급하므로써, 고분자의 난분해성 유기물을 생분해성 유기물로 저분자화 되도록, 반류수에 포함된 유기물을 고도 산화 처리하는 단계와, 상기 AOP(Advanced oxidation processes)부에서 고도 산화 처리된 반류수를 MBR(Membrane Bioreator)부로 반송하여, 상기 MBR(Membrane Bioreator)부에서는 고도 산화 처리된 반류수를 미생물을 이용하여 반류수에 포함된 유기물을 제거하는 단계, 및 상기 MBR(Membrane Bioreator)부에서 유기물이 미생물에 의해 제거된 반류수를 침사지로 반송하는 단계를 포함할 수 있다.The method of treating reflux water generated in the sewage treatment process according to the present invention comprises the steps of removing foreign substances contained in sewage water using specific gravity in the gypsum; Removing the suspended solids contained in the sewage in the first sedimentation tank by primary precipitation; Releasing phosphorus contained in the sewage, denitrifying the nitrate, treating the microorganism in the order of oxidation, nitrification and phosphorus accumulation of the organic matter; Removing the suspended solids contained in the sewage in the second sedimentation tank by secondary precipitation; Aggregating suspended matter, organic matter, and microbial particles contained in sewage in a coagulating sedimentation facility with a flocculant; Supplying ozone to sewage in an ozone treatment facility and deodorizing the ozone; And discharging the mixed sludge to the mixed sludge by discharging it to the mixed sludge by concentrating the excess sludge returned from the second settling tank to the concentrated sludge, Collecting the reflux water containing dehydrated filtrate generated by dewatering the mixed sludge into a storage tank when dewatering the dehydrator and discharging the mixed sludge returned from the concentrator to the cake, Fludized Bed Reactor (FBR), and the phosphate contained in the reflux water is recovered by crystallization of hydroxyapatite in the FBR (Fludized Bed Reactor)

Removing phosphorus in the Fludized Bed Reactor (FBR) portion;

) Is returned to the Advanced oxidation processes (AOP) section, and the AOP (Advanced oxidation processes) section supplies ozone to the reflux water so that the degradable organic material of the polymer is reduced to a biodegradable organic material And a step of performing an advanced oxidation process on the organic substances contained in the reflux water, and a step of returning the reflux water subjected to the highly oxidized treatment in the AOP (Advanced oxidation processes) section to a MBR (Membrane Bioreactor) Removing the organic matter contained in the reflux water by using the treated reflux water using the microorganism; and returning the reflux water in which the organic matter is removed by the microorganism to the gypsum in the MBR (Membrane Bioreactor).

) 형태의 인을 제거하는 단계에서, 상기 하이드록시아파타이트(Hydroxyapatite)의 결정화(Crystallization)를 이루기 위해 공급되는 칼슘(

)은 전기로 제강 공정의 랜들 정련과정에서 발생하는 환원슬래그(LF Slag)이다.At this time, in the FBR (Fludized Bed Reactor) part of the reflux water treatment method generated in the sewage treatment process according to the present invention,

In the step of removing phosphorus in the form of calcium phosphate (calcium phosphate) supplied to achieve the crystallization of the hydroxyapatite,

) Is a reducing slag (LF slag) generated during the LAND refining process in the electric furnace steelmaking process.

In the advanced oxidation processes (AOP) of the reflux water treatment method according to the present invention, at the stage of performing the high oxidation treatment of the organic substances contained in the reflux water, OH radicals are generated through the reaction to initiate the decomposition of ozone, (O3 / H₂O₂) process to induce O3 / High pH or O3 / Catalyst process that supports metal (Fe, Mn, Ti) using alumina, zeolite, An O3 / UV process in which OH radicals are generated from generated hydrogen peroxide by generating hydrogen peroxide when UV is applied when ozone is present in an aqueous solution; Or a combination of the two, it is possible to prevent secondary contamination such as an increase in concentration of a refractory substance, generation of sludge, and generation of an organic chlorine compound.

Further, in the MBR (Membrane Bioreactor) part of the reflux water treatment method generated in the sewage treatment process according to the present invention, in the step of removing the organic substances contained in the reflux water, the microfiltration membrane MF) or an ultrafiltration membrane (UF) can be immersed in the filtrate, and the bioreactor water can be biologically / physically treated by suction filtration.

The method of treating reflux water generated in the sewage treatment process according to the present invention has the following effects.

First, phosphorus contained in the reflux water is removed by crystallization of hydroxyapatite using reduced slag (LF slag) in the FBR (Fludized Bed Reactor) section, The biodegradable organic matter contained in the biodegradable organic material is highly oxidized and, optionally, MBR (Membrane Bioreactor) is used to recycle the biologically / physically treated water, which has been highly oxidized, to bioreactor or geyser. Have an effect.

Secondly, the calcium slab supplied to achieve the crystallization of hydroxyapatite is used as a reducing slag (LF slag) generated in the process of ladle refining of the electric furnace steelmaking process, It is possible to reduce the operation cost of the water treatment process because the medicine is not used.

1 is an exemplary view showing a sewage treatment process and a reflux water treatment process according to one embodiment of the reflux water treatment method generated in the sewage treatment process of the present invention.
FIG. 2 is an exemplary view showing a sewage treatment process and a reflux water treatment process according to another embodiment of the reflux water treatment method generated in the sewage treatment process of the present invention.
FIG. 3 is a view showing a crystallization process of hydroxyapatite using a reducing slag (LF slag) in a Fludized Bed Reactor (FBR) part according to the present invention.
FIG. 4 is a schematic diagram showing a process in which a reflux water is subjected to an advanced oxidation process in an AOP (Advanced oxidation processes) section according to the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. Prior to this, terms and words used in the present specification and claims should not be construed as limited to ordinary or dictionary terms, and the inventor should appropriately interpret the concepts of the terms appropriately The present invention should be construed in accordance with the meaning and concept consistent with the technical idea of the present invention.

Therefore, the embodiments described in the present specification and the configurations shown in the drawings are merely the most preferred embodiments of the present invention, and not all of the technical ideas of the present invention are described. Therefore, at the time of the present application, It should be understood that variations can be made.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

The present invention collects reflux water generated in a sewage treatment process, removes phosphorus from a reduced slag in an FBR (Fludized Bed Reactor), removes phosphorus from a refluxed bed reactor in AOP (Advanced oxidation processes) This is a method for treating reflux water in a sewage treatment process in which organic matter is highly oxidized and recycled to a bioreactor or gypsum to treat the biologically / physically treated water treated with highly oxidized reflux water in MBR (Membrane Bioreactor) And will be described with reference to the drawings.

First, the sewage treatment process according to the present invention will be briefly described as a conventional sewage treatment technique.

As shown in FIGS. 1 and 2, foreign matter contained in sewage water is removed using a specific gravity in the gypsum 10, and the sewage is introduced into the gypsum 10, Thereby removing the foreign matter contained in the sewage.

At this time, in the gypsum board 10, a foreign matter sinking in the water due to a specific gravity is precipitated, and the substance floating on the water is removed by removing the foreign substance on the screen through the screen.

The next step is to remove the suspended solids contained in the sewage from the first sedimentation tank 20 and to remove the foreign substances from the sedimentation tank 10 into the first sedimentation tank 20, In the sedimentation paper 20, the suspended matters contained in the sewage are removed by primary precipitation.

At this time, the first settling basin 20 removes foreign matter at a flow rate, and the sewage passing through the first settling basin 20 is collected by the first settling basin 20 to remove the precipitable material in the sewage, 1.5 to 3.0 hours, and the effective water depth is 2 to 4 m, and the water flow forms a horizontal flow from one side to the other side, but is not limited thereto.

The sedimentation sludge precipitated in the first sedimentation basin 20 is easily decayed and thus has a sludge scraper and a sludge discharge facility which can be always removed.

It is also possible to bypass sewage that has passed through the first settling basin 20 together with stormy rain during the rainy season to the flocculation and sedimentation facility 50.

The next step is a step of discharging phosphorus contained in sewage, denitrifying nitrate, treating microorganisms in the order of oxidation, nitrification and phosphorus accumulation of organic matter in the bioreactor 30. In the first settler 20, Nitrification of the organic matter, nitrification of the organic matter, nitrification of the nitrifying agent, nitrification of the nitrifying agent, nitrification of the organic matter, Organics are removed in order to accumulate phosphorus.

At this time, the bioreactor 30 treats the sewage as microorganisms, and oxygen can be continuously injected, and methanol can be injected when sewage can not be treated due to overload.

The next step is to remove the suspended solids contained in sewage in the second settler 40 by removing the phosphorus, nitrate and organic matter from the bioreactor 30 into the second settler 40 And the suspended solids contained in the sewage are secondarily sedimented by using the second sedimentation paper 40.

At this time, the sludge and other foreign substances generated in the bioreactor 30 are settled and removed, and the second settler 40 also removes foreign matter at a flow rate.

Sewage water passed through the bioreactor 30 is collected by a second sedimentation tank 40 to remove precipitable substances in the sewage. The retention time of the sewage is about 1.5 to 3.0 hours, the effective water depth is 2 to 4 m, The water flow forms a horizontal flow from one side to the other but is not limited thereto.

The sedimentation sludge settled in the second sedimentation tank 40 is also susceptible to spoilage, so it is always equipped with a sludge scraper and a sludge discharge facility which can be removed.

The transport sludge is again transported to the bioreactor 30 and reprocessed in the bioreactor 30, and the excess sludge is transported to the bioreactor 30, Is discharged to the storage tank for collecting only surplus sludge.

In addition, the sewage water passed through the second settling tank 40 is taken out to the coagulating sedimentation facility 50 at the time of normal sunshine (non-rainy day) and to the ozone treatment facility 60 at the time of rainfall.

The next step is to flocculate sediment, organic matter, and microbes of microorganisms contained in sewage in the coagulation sedimentation facility 50 with a coagulant and then remove the flocculant from the second sedimentation tank 40, (50), and using the flocculation and sedimentation facility (50), fine particles such as suspended substances, organic substances and microorganisms contained in sewage are flocculated with an aggregating agent and then removed.

The next step is a step of supplying ozone to the sewage in the ozone treatment facility 60. In the flocculation and sedimentation facility 50, fine particles such as suspended matter, organic matter and microorganisms are flocculated with flocculant, The ozone treatment facility (60) supplies ozone to the sewage to sterilize and deodorize the sewage water by the strong oxidative decomposition action of the ozone.

The next step is the step of discharging to the river through the discharge pump 70. The sterilized and deodorized sewage is collected into the storage tank via the ozone treatment facility and discharged to the river through the discharge pump.

The present invention relates to a method for treating phosphates and refractory organics in a reflux water by collecting reflux water generated in a sewage treatment process, and the process is as follows.

As shown in FIG. 1, the step of collecting the reflux water into the storage tank includes the steps of concentrating the excess sludge returned from the second settler 40 in the sewage treatment process to the mixed sludge by the concentrator 110, The condensed filtrate generated by concentrating the sludge and the mixed sludge conveyed by the concentrator 110 are drained into the cake and discharged into the cake. The condensed water including the dehydrated filtrate generated while dewatering the mixed sludge is collected into the storage tank .

) 형태의 인을 제거하는 단계로, 상기 저류조에 수집된 반류수를 FBR(Fludized Bed Reactor)부(200)로 반송하여, 상기 FBR(Fludized Bed Reactor)부(200) 내부에 수용된 칼슘(

)과 반류수의 하이드록시아파타이트(Hydroxyapatite)의 결정화(Crystallization)를 이용해 반류수에 포함된 인산염(

) 형태의 인을 제거한다.In the next step, the FBR (Fludized Bed Reactor) unit 200 converts the phosphate contained in the reflux water

(FBR) unit 200. The FBR (Fludized Bed Reactor) unit 200 removes phosphorus in the FBR (Fludized Bed Reactor) unit 200,

) And the crystallization of the hydroxyapatite of the counter current water to remove the phosphate contained in the reflux water

) Form of phosphorus.

) 형태의 인을 제거되는 과정은 아래의 화학식1에서 확인할 수 있다.Crystallization of the hydroxyapatite results in the formation of phosphates (

) Form of phosphorus can be confirmed by the following formula (1).

 [Chemical Formula 1]

)을 지정 두께로 침적하고, 상기 탱크의 하부에서 상기 저류조에 수집된 반류수를 펌프를 통해 인입시켜, 반류수가 탱크의 하부에서 상부로 점차 유동하면서 하이드록시아파타이트(Hydroxyapatite)의 결정화(Crystallization)로 인산염(

) 형태의 인이 침전되어 제거된다.As shown in FIG. 3, the FBR (Fludized Bed Reactor) unit 200 has a predetermined height (height) so that crystallization of hydroxyapatite can be facilitated in the FBR (Fludized Bed Reactor) Gt; (< / RTI >< RTI ID =

Is withdrawn from the bottom of the tank through the pump and the recirculated water gradually flows from the bottom to the top of the tank to cause crystallization of the hydroxyapatite. phosphate(

) Are precipitated and removed.

)은 전기로 제강 공정의 랜들 정련과정에서 발생하는 환원슬래그(LF Slag)을 사용하는 것이 바람직하다. At this time, the calcium (Ca) precipitated in the tank

It is preferable to use a reducing slag (LF slag) generated in the process of ladle refining of the electric furnace steelmaking process.

)은 CaO 형태로 존재하지만 용액에서 수화되어 수산화칼슘(Ca(OH)₂(s))형태가 되고, 해리에 의하여

과

형태로 이온화된다.The high concentration of calcium (LF) present in the reducing slag

) Is present in the form of CaO but is hydrated in solution to form calcium hydroxide (Ca (OH) ₂ (s)),

and

Lt; / RTI >

The following formula 2 is shown below.

(2)

) 형태의 인이 제거된 반류수를 AOP(Advanced oxidation processes)부(300)로 반송하여, 상기 AOP(Advanced oxidation processes)부(300)에서는 반류수에 오존을 공급하므로써, 도 4에 도시한 바와 같이 고분자의 난분해성 유기물을 생분해성 유기물로 저분자화 되도록, 반류수에 포함된 유기물을 고도 산화 처리한다.The next step is a step of performing an advanced oxidation treatment of the organic substances contained in the reflux water in the Advanced oxidation processes (AOP) unit 300. In the FBR (Fludized Bed Reactor) unit 200,

) Is returned to the AOP (Advanced Oxidation Process) unit 300 and the AOP (Advanced oxidation processes) unit 300 supplies ozone to the reflux water. As a result, as shown in FIG. 4 Likewise, the organic matter contained in the reflux water is highly oxidized so that the degradable organic matter of the polymer is converted into a biodegradable organic matter.

At this time, the ozone-based high-level oxidation unit process has a strong oxidizing power, so that it is possible to oxidize many organic and inorganic compounds. As a result, the biodegradable organic material of the polymer in the reflux water is low- The efficiency of the treatment can be increased.

Further, in the Advanced Oxidation Process (AOP) unit 300, O 3 / High pH or O 3 / O 3 which induces OH radicals through a reaction to initiate decomposition of ozone for highly oxidizing the organic substances contained in the reflux water, H₂O₂ process, an O₃ / Catalyst process in which metal (Fe, Mn, Ti) is supported using alumina, zeolite, activated carbon, etc. as a support to enhance catalytic activity. When ozone is present in aqueous solution, UV irradiation generates hydrogen peroxide And the O3 / UV process in which OH radicals are generated from the generated hydrogen peroxide, or a combination of the two processes, so that secondary contamination such as rise of the degradable material, sludge generation, and generation of organic chlorine compound prevent.

The next step is a step of returning the untreated water to which the organic matter has been highly oxidized in the Advanced oxidation processes (AOP) unit 300 to the biological reaction tank 30. In the Advanced oxidation processes (AOP) unit 300, The treated reflux water is returned to the biological reaction tank 30, which is one of the sewage treatment processes, and reprocessed from the biological reaction tank 30.

As shown in FIG. 2, the step of collecting the recirculated water into the storage tank includes concentrating the excess sludge returned from the second settler 40 in the sewage treatment process to the concentrated sludge by the concentrator 110, The condensed filtrate generated by concentrating the sludge and the mixed sludge conveyed by the concentrator 110 are drained into the cake and discharged into the cake. The condensed water including the dehydrated filtrate generated while dewatering the mixed sludge is collected into the storage tank .

) 형태의 인을 제거하는 단계로, 상기 저류조에 수집된 반류수를 FBR(Fludized Bed Reactor)부(200)로 반송하여, 상기 FBR(Fludized Bed Reactor)부(200) 내부에 수용된 칼슘(

)과 반류수의 하이드록시아파타이트(Hydroxyapatite)의 결정화(Crystallization)를 이용해 반류수에 포함된 인산염(

) 형태의 인을 제거한다.In the next step, the FBR (Fludized Bed Reactor) unit 200 converts the phosphate contained in the reflux water

(FBR) unit 200. The FBR (Fludized Bed Reactor) unit 200 removes phosphorus in the FBR (Fludized Bed Reactor) unit 200,

) And the crystallization of the hydroxyapatite of the counter current water to remove the phosphate contained in the reflux water

) Form of phosphorus.

) 형태의 인을 제거되는 과정은 아래의 화학식1에서 확인할 수 있다.Crystallization of the hydroxyapatite results in the formation of phosphates (

) Form of phosphorus can be confirmed by the following formula (1).

 [Chemical Formula 1]

)을 지정 두께로 침적하고, 상기 탱크의 하부에서 상기 저류조에 수집된 반류수를 펌프를 통해 인입시켜, 반류수가 탱크의 하부에서 상부로 점차 유동하면서 하이드록시아파타이트(Hydroxyapatite)의 결정화(Crystallization)로 인산염(

) 형태의 인이 침전되어 제거된다.As shown in FIG. 3, the FBR (Fludized Bed Reactor) unit 200 has a predetermined height (height) so that crystallization of hydroxyapatite can be facilitated in the FBR (Fludized Bed Reactor) Gt; (< / RTI >< RTI ID =

Is withdrawn from the bottom of the tank through the pump and the recirculated water gradually flows from the bottom to the top of the tank to cause crystallization of the hydroxyapatite. phosphate(

) Are precipitated and removed.

)은 전기로 제강 공정의 랜들 정련과정에서 발생하는 환원슬래그(LF Slag)을 사용하는 것이 바람직하다. At this time, the calcium (Ca) precipitated in the tank

It is preferable to use a reducing slag (LF slag) generated in the process of ladle refining of the electric furnace steelmaking process.

)은 CaO 형태로 존재하지만 용액에서 수화되어 수산화칼슘(Ca(OH)2(s))형태가 되고, 해리에 의하여

과

형태로 이온화된다.The high concentration of calcium (LF) present in the reducing slag

) Is present in the form of CaO but is hydrated in solution to form calcium hydroxide (Ca (OH) 2 (s)),

and

Lt; / RTI >

The following formula 2 is shown below.

(2)

) 형태의 인이 제거된 반류수를 AOP(Advanced oxidation processes)부(300)로 반송하여, 상기 AOP(Advanced oxidation processes)부(300)에서는 반류수에 오존을 공급하므로써, 도 4에 도시한 바와 같이 고분자의 난분해성 유기물을 생분해성 유기물로 저분자화 되도록, 반류수에 포함된 유기물을 고도 산화 처리한다.The next step is a step of performing an advanced oxidation treatment of the organic substances contained in the reflux water in the Advanced oxidation processes (AOP) unit 300. In the FBR (Fludized Bed Reactor) unit 200,

) Is returned to the AOP (Advanced Oxidation Process) unit 300 and the AOP (Advanced oxidation processes) unit 300 supplies ozone to the reflux water. As a result, as shown in FIG. 4 Likewise, the organic matter contained in the reflux water is highly oxidized so that the degradable organic matter of the polymer is converted into a biodegradable organic matter.

At this time, the ozone-based high-level oxidation unit process has a strong oxidizing power, so that it is possible to oxidize many organic and inorganic compounds. As a result, the biodegradable organic material of the polymer in the reflux water is low- The efficiency of the treatment can be increased.

Further, in the Advanced Oxidation Process (AOP) unit 300, O 3 / High pH or O 3 / O 3 which induces OH radicals through a reaction to initiate decomposition of ozone for highly oxidizing the organic substances contained in the reflux water, In the O₃ / Catalyst process in which metal (Fe, Mn, Ti) is supported using alumina, zeolite and activated carbon as supporting materials to enhance the catalytic activity of H₂O₂ (hydrogen peroxide) The O3 / UV process, in which hydrogen peroxide is generated and OH radicals are generated from the generated hydrogen peroxide, is carried out in a combination of two or more processes to increase the amount of recalcitrant substances, sludge formation, Prevent car pollution.

In the next step, the MBR (Membrane Bioreactor) unit 400 transports the semi-permeate water in which the organic matter is removed by the microorganism, and the MBR (Membrane Bioreactor) The microfiltration membrane MF or the ultrafiltration membrane UF is immersed in the aeration tank included in the membrane membrane bioreactor (MBR) unit 400, and the bioreactor is biologically / physically treated by suction filtration.

Then, the MBR (Membrane Bioreactor) unit 400 transports the recirculated water, in which the organic matter is removed by the microorganism, to the gill 10.

While the present invention has been described with reference to exemplary embodiments, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims. Accordingly, the true scope of the present invention should be determined by the technical idea of the appended claims.

10: Chimney 20: First settler
30: Bioreactor 40: Second clarifier
50: Coagulation sedimentation facility 60: Ozone treatment facility
70: discharge pump 110: concentrator
120: Dehydrator
200: Fludized Bed Reactor (FBR)
300: AOP (Advanced oxidation processes)
400: MBR (Membrane Bioreactor)

Claims (5)

Removing foreign matter contained in sewage water using a specific gravity in the geyser; Removing the suspended solids contained in the sewage in the first sedimentation tank by primary precipitation; Releasing phosphorus contained in the sewage, denitrifying the nitrate, treating the microorganism in the order of oxidation, nitrification and phosphorus accumulation of the organic matter; Removing the suspended solids contained in the sewage in the second sedimentation tank by secondary precipitation; Aggregating suspended matter, organic matter, and microbial particles contained in sewage in a coagulating sedimentation facility with a flocculant; Supplying ozone to sewage in an ozone treatment facility and deodorizing the ozone; And discharging the effluent to the river through a discharge pump,
The concentrated sludge generated by concentrating the excess sludge when the concentrated sludge conveyed in the second sedimentation tank is concentrated by the concentrator and discharged to the sludge mixed sludge and the mixed sludge generated by concentrating the excess sludge, Collecting the reflux water including the dehydrated filtrate generated while dewatering the sludge into a storage tank;
The recycle water collected in the storage tank is returned to the FBR (Fludized Bed Reactor), and the phosphate contained in the recirculated water is recovered by crystallization of hydroxyapatite in the FBR (Fludized Bed Reactor)

≪ / RTI >
In the FBR (Fludized Bed Reactor) part, phosphate (

) Is returned to the Advanced oxidation processes (AOP) section, and the AOP (Advanced oxidation processes) section supplies ozone to the reflux water so that the degradable organic material of the polymer is reduced to a biodegradable organic material , A step of subjecting the organic matter contained in the reflux water to an advanced oxidation treatment; And
And returning the untreated water, which has been highly oxidized by the organic matter, to the biological reaction tank in the Advanced Oxidation Process (AOP) unit.
Removing foreign matter contained in sewage water using a specific gravity in the geyser; Removing the suspended solids contained in the sewage in the first sedimentation tank by primary precipitation; Releasing phosphorus contained in the sewage, denitrifying the nitrate, treating the microorganism in the order of oxidation, nitrification and phosphorus accumulation of the organic matter; Removing the suspended solids contained in the sewage in the second sedimentation tank by secondary precipitation; Aggregating suspended matter, organic matter, and microbial particles contained in sewage in a coagulating sedimentation facility with a flocculant; Supplying ozone to sewage in an ozone treatment facility and deodorizing the ozone; And discharging the effluent to the river through a discharge pump,
The concentrated sludge generated by concentrating the sludge when the excess sludge conveyed in the second sedimentation tank is concentrated by the concentrator and discharged to the sludge mixed sludge and the concentrated sludge generated by concentrating the mixed sludge conveyed by the concentrator into the mixed sludge when the dehydrator is drained to the cake, Collecting the reflux water containing the dehydrated filtrate generated in dehydration into a storage tank;
The recycle water collected in the storage tank is returned to the FBR (Fludized Bed Reactor), and the phosphate contained in the recirculated water is recovered by crystallization of hydroxyapatite in the FBR (Fludized Bed Reactor)

≪ / RTI >
In the FBR (Fludized Bed Reactor) part, phosphate (

) Is returned to the Advanced oxidation processes (AOP) section, and the AOP (Advanced oxidation processes) section supplies ozone to the reflux water so that the degradable organic material of the polymer is reduced to a biodegradable organic material , A step of subjecting the organic matter contained in the reflux water to an advanced oxidation treatment;
The MBR (Membrane Bioreactor) unit conveys the highly refined circulated water in the Advanced Oxidation Processes (AOP) unit and the highly refined circulated water in the Membrane Bioreactor (MBR) ; And
And returning the semi-permeate water in which the organic matter is removed by the microorganism to the gypsum in the MBR (Membrane Bioreactor).
The method according to any one of claims 1 to 3,
In the FBR (Fludized Bed Reactor) part, phosphate contained in the reflux water (

) Type of phosphorus,
The calcium supplied to achieve the crystallization of the hydroxyapatite

)silver
Wherein the slag is a reducing slag (LF slag) generated in a ladle refining process in an electric furnace steelmaking process.
The method according to any one of claims 1 to 3,
In the advanced oxidation processes of the organic substances contained in the reflux water in the AOP (Advanced oxidation processes)
O3 / High pH or O₃ / H2O2 (hydrogen peroxide) process that induces OH radicals through a reaction that initiates decomposition of ozone;
O3 / Catalyst process in which metal (Fe, Mn, Ti) is supported using alumina, zeolite, activated carbon or the like as a support to enhance the activity of the catalyst;
O3 / UV process in which OH radicals are generated from generated hydrogen peroxide when UV is applied when ozone is present in aqueous solution and hydrogen peroxide is generated; , Or a combination of the two, to prevent secondary contamination such as rise of refractory materials, generation of sludge, and generation of organic chlorine compounds.
The method of claim 2,
In the MBR (Membrane Bioreactor) step, in the step of removing the organic substances contained in the reflux water,
A method of treating a reflux water generated in a sewage treatment process in which a microfiltration membrane (MF) or an ultrafiltration membrane (UF) is immersed in an aeration tank included in the MBR (Membrane Bioreactor) unit and subjected to biological /

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