KR100946088B1 - Method for Removing Thiocyan in Waste Water of Chemical Plant - Google Patents
Method for Removing Thiocyan in Waste Water of Chemical Plant Download PDFInfo
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- KR100946088B1 KR100946088B1 KR1020020083132A KR20020083132A KR100946088B1 KR 100946088 B1 KR100946088 B1 KR 100946088B1 KR 1020020083132 A KR1020020083132 A KR 1020020083132A KR 20020083132 A KR20020083132 A KR 20020083132A KR 100946088 B1 KR100946088 B1 KR 100946088B1
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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
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/78—Treatment of water, waste water, or sewage by oxidation with ozone
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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
- C02F1/58—Treatment of water, waste water, or sewage by removing specified dissolved compounds
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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
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/722—Oxidation by peroxides
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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
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/16—Nature of the water, waste water, sewage or sludge to be treated from metallurgical processes, i.e. from the production, refining or treatment of metals, e.g. galvanic wastes
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Abstract
본 발명은 화성폐수중에 함유된 티오시안을 제거하는 방법에 관한 것이다.The present invention relates to a method for removing thiocyanate contained in Martian wastewater.
본 발명에 의하면, 티오시안 함유 화성 폐수에 폐수 10ℓ당 70㎖이상의 오존(O3)가스를 투여하여 화성폐수중의 티오시안을 제거하는 방법이 제공된다.According to the present invention, a method by administering a thiocyanate-containing waste water ozone than 10ℓ per 70㎖ to the chemical waste water (O 3) gas to remove the thiocyanate of flammable waste it is provided.
본 발명은 티오시안이온 화성폐수에 오존가스를 투여하므로서 폐수중에 존재하는 티오시안의 농도를 현저히 저감시킬 수 있는 효과가 있는 것이다.The present invention has an effect of remarkably reducing the concentration of thiocyanate present in the wastewater by administering ozone gas to the thiocyanate chemical wastewater.
화성, 폐수, 티오시안, 오존가스, 과산화수소Mars, wastewater, thiocyanate, ozone gas, hydrogen peroxide
Description
도 1은 종래방법에 따라 화성폐수를 처리하는 공정을 나타내는 공정도1 is a process chart showing a process for treating wastewater according to the conventional method.
도 2는 본 발명에 따라 화성폐수를 처리하는 공정을 나타내는 공정도2 is a process chart showing a process for treating wastewater according to the present invention.
도 3은 폐수 10ℓ당 오존(O3)가스 투여량 변화에 따른 티오시안 이온함량의 변화를 나타내는 그래프 3 is a graph showing the change in the thiocyanate ion content according to the ozone (O 3 ) gas dose change per 10 liters of wastewater
도 4는 화성폐수(처리)온도에 따른 티오시안 이온의 제거효율변화를 나타내는 그래프 4 is a graph showing the change in removal efficiency of thiocyanate ions according to the temperature of the wastewater (treatment)
도 5는 폐수 10ℓ당 과산화수소 투여량 변화에 따른 티오시안 이온함량의 제거효율증가분의 변화를 나타내는 그래프 5 is a graph showing the change in removal efficiency increase of the thiocyanate ion content according to the hydrogen peroxide dosage change per 10 liter of wastewater
본 발명은 화성폐수중에 함유된 티오시안을 제거하는 방법에 관한 것으로서, 보다 상세하게는 오존(O3)가스를 이용하여 화성폐수중에 함유된 티오시안을 제거하는 방법에 관한 것이다. The present invention relates to a method for removing thiocyanate contained in the waste water, and more particularly, to a method for removing thiocyanate contained in the waste water using ozone (O 3 ) gas.
화성폐수중에 함유된 티오시안을 제거하는 방법으로는 활성오니법으로 호기성균에 의하여 티오시안을 제거하는 방법이 알려져 있다.As a method of removing thiocyanate contained in the chemical wastewater, a method of removing thiocyanate by an aerobic bacterium is known by the activated sludge method.
종래방법에서는 도 1에 나타난 바와 같이 화성폐수는 폭기조로 공급하여 호기성으로 폭기하여 화성폐수중의 티오시안을 제거한 다음, 1차 침전조로 보내어 상등수는 약품처리조에서 약품처리되고, 침전물은 폭기조로 다시 순환된다.In the conventional method, as shown in FIG. 1, the waste water is supplied to the aeration tank to aeration to remove a thiocyanate from the waste water, and then sent to the primary sedimentation tank. Circulated.
그리고 약품처리된 상등수는 2차 침전조로 보내지고 2차 침전조의 상등수는 배수 종말 처리장으로 보내지고, 침전물은 탈수 및 슬러지 처리된다. The treated supernatant is sent to the secondary sedimentation tank, the supernatant of the secondary sedimentation tank is sent to the drainage end treatment plant, and the sediment is dewatered and sludge treated.
상기 약품처리조에서는 1차 침전조로부터 유출된 상등액 중에 폭기조에서 미생물 처리가 불가능한 고농도의 CN-, F-등을 처리하고, 함유된 슬러지를 응집시켜 계외로 배출가능토록 하기 위하여 응집제인 고분자 응집제(포리머), 응집 필요조건을 확보하기 위한 PH 조정용 NaOH, 슬러지 응집을 위한 FeCl3, 불소처리를 위한 불소처리제등을 사용하고 있다. The chemical treatment tank in the supernatant flowed out from the primary sedimentation tank to treat high concentrations of CN-, F-, etc., which is impossible to treat microorganisms in the aeration tank, and to coagulate the sludge to be discharged out of the system (polymer) ), NaOH for pH adjustment to secure the coagulation requirements, FeCl 3 for sludge flocculation, and fluorine treatment for fluorine treatment are used.
그러나, 상기한 종래방법은 폭기조에 공기를 투여하여 화성폐수중에 함유된 티오시안을 제거하기 때문에 티오시안을 제거하는 효율성이 매우 낮다는 문제점이 있다.However, the above-described conventional method has a problem in that the efficiency of removing thiocyanide is very low because it removes thiocyanate contained in the wastewater by administering air to the aeration tank.
또한, 티오시안 함유 폐수를 처리하는 다른 방법으로는 대한민국 공개특허 1995-008384호에 제시되어 있는 방법을 들수 있다.In addition, another method for treating thiocyanate-containing wastewater may be a method disclosed in Korean Patent Laid-Open Publication No. 1995-008384.
상기 공개특허에는 폭기조를 이용하는 활성오니법에 의해 티오시안 함유 폐수를 처리하는 방법에 있어서, 상기 폭기조로서 밀폐형 폭기조를 사용하고, 상기 폭기조에는 폐수에 충분히 침적되도록 다공성 매질이 설치되고, 그리고 산소를 폭기조내에 주입하여 폐수중에 용존시키는 것을 특징으로 하는 산소 활성오니법을 이용한 티오시안 함유 폐수 처리방법이 제시되어 있다. According to the above-mentioned patent, in the method for treating thiocyanate-containing wastewater by an activated sludge method using an aeration tank, a closed aeration tank is used as the aeration tank, and the aeration tank is provided with a porous medium so as to be sufficiently deposited in the wastewater, and oxygen aeration tank. A thiocyanate-containing wastewater treatment method using an oxygen activated sludge method, which is injected into a water and dissolved in the wastewater, has been proposed.
그러나, 상기한 종래의 산소 활성오니법을 이용한 티오시안 함유 폐수 처리방법은 폭기조에서 산소가 용해하는데는 한계가 있기 때문에 실제적으로 티오시안을 처리하는데는 효율성이 낮게 되는 문제점이 있다.However, the thiocyanate-containing wastewater treatment method using the conventional oxygen activated sludge process has a problem in that the efficiency of treating thiocyanate is lowered because oxygen is limited in the aeration tank.
더욱이, 화성폐수에 함유된 티오시안은 화학적으로 안정한 형태를 이루고 있기 때문에 상기한 종래방법을 사용하는 경우에는 일부 만이 흡착에 의해서 제거되고 대부분의 경우는 제거가 불가능하게 되는 문제점이 있다.Moreover, since thiocyanate contained in the chemical wastewater has a chemically stable form, in the case of using the above-described conventional method, only a part is removed by adsorption, and in most cases, there is a problem that the removal is impossible.
본 발명은 상기한 종래기술의 제반 문제점을 해결하기 위하여 연구 및 실험을 행하고, 그 결과에 근거하여 본 발명을 제안하게 된 것으로서, 본 발명은 오존(O3)가스를 이용하여 티오시안 함유 화성폐수중의 티오시안을 제거함으로써 티오시안이온의 제거 효율을 보다 향상시킬 수 있는 화성폐수중 티오시안 제거방법을 제공하고자 하는데, 그 목적이 있는 것이다.The present invention has been conducted in order to solve the above-mentioned problems of the prior art, and based on the results of the present invention, the present invention, using the ozone (O 3 ) gas is thiocyanate-containing waste water It is an object of the present invention to provide a method for removing thiocyanate from chemical wastewater that can further improve the removal efficiency of thiocyanate by removing thiocyanide in the present invention.
이하, 본 발명에 대하여 설명한다.EMBODIMENT OF THE INVENTION Hereinafter, this invention is demonstrated.
본 발명은 티오시안 함유 화성 폐수에 오존(O3)가스를 투여하여 화성폐수중의 티오시안을 제거하는 방법에 관한 것이다.The present invention relates to a method for removing thiocyanate in a waste water by administering ozone (O 3 ) gas to the thiocyanate containing waste water.
본 발명의 바람직한 방법에서는 티오시안 함유 화성 폐수에 오존(O3)가스와 과산화수소(H2O2)를 투여하여 화성폐수중의 티오시안을 제거한다.In a preferred method of this invention by administering the ozone (O 3) gas and hydrogen peroxide (H 2 O 2) in the thiocyanate-containing flammable waste water to remove the thiocyanate of flammable waste water.
이하, 본 발명에 대하여 상세히 설명한다.EMBODIMENT OF THE INVENTION Hereinafter, this invention is demonstrated in detail.
제철소의 화성공장에서 발생되는 화성폐수중에는 티오시안 화합물이 함유되어 있는데, 이들 화합물은 주로 티오시안 암모늄(NH4SCN)이다.The waste water from the chemical plant at the steel mill contains thiocyanate compounds, which are mainly thiocyanate ammonium (NH 4 SCN).
상기 티오시안 암모늄은 화학적으로 안정한 상태를 나타내며, 암모늄 이온을 제거하기 위해서 알카리를 사용하여도 티오시안 이온으로 폐수중에 남게 된다. The thiocyanate ammonium exhibits a chemically stable state, and even though alkali is used to remove ammonium ions, the thiocyanate is left in the waste water as thiocyanate ions.
제철소의 화성공장에서 발생되는 화성폐수중에는 통상 300∼400ppm정도의 티오시안이 함유되어 있다.The Hwaseong wastewater generated at the Hwaseong plant in steel mills typically contains about 300 to 400ppm of thiocyanate.
본 발명자들은 화성폐수로부터 티오시안 이온을 제거하기 위해서는 강력한 화학 반응을 통해서만 제거가 가능하다는 것을 연구을 통하여 지득하게 되었다.The present inventors have learned through research that in order to remove thiocyan ions from the wastewater, it can be removed only by a strong chemical reaction.
즉, SCN이온의 원소 즉, S, C, N를 분해할 정도의 강력한 화학적인 반응이 필요하다는 것을 지득하게 되었다.In other words, it has been learned that a strong chemical reaction is required to decompose the elements of SCN ions, that is, S, C, and N.
본 발명에서는 SCN이온의 원소 즉, S, C, N를 분해할 정도의 강력한 화학적인 반응을 확보하기 위하여 발생기 산소을 지닌 오존가스를 화성폐수 중에 투여한 것이다.In the present invention, ozone gas with generator oxygen is administered to the wastewater to secure a strong chemical reaction to decompose the elements of SCN ions, that is, S, C, and N.
상기와 같이 오존가스를 화성폐수 중에 투여하는 경우에는 티오시안 이온을 황산화물 및 탄소산화물 형태인 황산화합물과 이산화탄소가스로 전환시켜 제거시킬 수 있다.When ozone gas is administered in the wastewater as described above, the thiocyanate ions can be removed by converting the sulfuric acid compounds and carbon dioxide gas in the form of sulfur oxides and carbon oxides.
상기 티오시안 이온의 전환반응에 대하여 설명하면 다음과 같다.The conversion reaction of the thiocyanate ions is as follows.
화성폐수중의 티오시안 화합물은 주로 티오시안암모늄(NH4SCN)으로서 폐수중에 NH4 +이온과 SCN- 이온으로 존재하게 된다. The thiocyanate compounds in the chemical wastewater are mainly thiocyanate (NH 4 SCN), which are present in the waste water as NH 4 + ions and SCN − ions.
상기와 같이 NH4 + 이온과 SCN- 이온이 존재하는 화성 폐수에 오존을 투여하면, 하기 화학식(1)과 같이 티오시안 화합물이 분해되어 황산암모늄으로 변화되고 이산화탄소 가스를 발생하게 된다. When ozone is administered to the chemical waste water containing NH 4 + ions and SCN − ions as described above, the thiocyanate compound is decomposed to ammonium sulfate and generates carbon dioxide gas as shown in the following formula (1).
상기한 화학식(1)과 같이 티오시안 화합물을 화학반응시켜 황산암모늄과 이산화탄소로 전환시킴으로써 화성폐수중의 티오시안의 제거가 가능하게 된다.As described in the above formula (1), the thiocyanate compound is chemically reacted and converted to ammonium sulfate and carbon dioxide, thereby making it possible to remove the thiocyanate in the chemical wastewater.
본 발명에서는 티오시안함유 화성폐수에 투여되는 오존가스의 량은 폐수 10ℓ당 70㎖이상이 바람직하며, 보다 바람직하게는 폐수 10ℓ당 75∼100㎖이다.In the present invention, the amount of ozone gas administered to the thiocyanate-containing wastewater is preferably 70 ml or more per 10 liters of wastewater, more preferably 75 to 100 ml per 10 liters of wastewater.
상기한 화학반응의 속도를 신속하게 하기 위하여 폐수 온도는 45℃이상으로 유지하는 것이 바람직한데, 그 이유는 폐수 온도가 45℃미만인 경우에는 티오시안화합물의 반응속도가 떨어져서 제거효율이 저하되기 때문이다.In order to speed up the above-mentioned chemical reaction, it is preferable to maintain the waste water temperature at 45 ° C. or higher, because when the waste water temperature is less than 45 ° C., the reaction rate of the thiocyanate compound is lowered and the removal efficiency is lowered. .
본 발명에서는 티오시안 함유 화성 폐수에 오존(O3)가스와 과산화수소(H2O2)를 함께 투여하는 것이 바람직하다.In the present invention, it is preferable to administer ozone (O 3 ) gas and hydrogen peroxide (H 2 O 2 ) together to the thiocyanate containing wastewater.
상기와 같이 오존(O3)가스와 함께 과산화수소(H2O2)를 투여하는 경우에는 반응의 속도을 향상시켜 처리시간을 단축시킬 수 있다.As described above, in the case of administering hydrogen peroxide (H 2 O 2 ) together with ozone (O 3 ) gas, the reaction time can be improved to shorten the treatment time.
이 때, 과산화수소(H2O2)의 투여량은 폐수 10ℓ당 10㎖이상이 바람직하며, 보다 바람직한 투여량은 폐수 10ℓ당 10∼50㎖이며, 가장 바람직한 투여량은 폐수 10ℓ당 40∼50㎖이다.In this case, the dosage of hydrogen peroxide (H 2 O 2 ) is preferably 10 ml or more per 10 l of wastewater, more preferably 10 to 50 ml per 10 l of wastewater, and most preferably 40 to 50 ml per 10 l of wastewater. to be.
본 발명에서는 도 2에 나타난 바와 같이 반응탱크내의 화성폐수에 오존가스 또는 오존가스 및 과산화수소를 투여하여 반응시킨 다음, 폭기조로 보내어 폭기시킨 다음, 통상적인 방법에 따라 1차 침전조, 약품처리조 및 2차 침전조를 거쳐 배수종말장으로 이송된다.In the present invention, as shown in Figure 2 by reacting the ozone gas or ozone gas and hydrogen peroxide to the chemical waste water in the reaction tank, and then sent to the aeration tank and aerated, the primary sedimentation tank, chemical treatment tank and 2 It is transferred to the drainage end via the secondary settling tank.
상기 1차 침전조에서 발생되는 침전물은 통상적인 방법에서와 같이 폭기조로 순환되며, 상기 2차 침전조에서 발생되는 침전물은 탈수 및 슬러지 처리된다.The precipitate generated in the primary sedimentation tank is circulated to the aeration tank as in a conventional method, and the precipitate generated in the secondary sedimentation tank is subjected to dehydration and sludge treatment.
이하, 실시예를 통하여 본 발명을 보다 구체적으로 설명한다.Hereinafter, the present invention will be described in more detail with reference to Examples.
(실시예 1)(Example 1)
티오시안이온 (SCN-) 농도가 330ppm인 15℃의 화성폐수에 오존가스를 도 3에서와 같이 투여량을 변화시키면서 투여하여 화성폐수의 티오시안 이온을 제거하는 처리를 도 2에서와 같이 행한 후, 1차 침전조에 보내기 전의 폐수중의 티오시안 이온의 함량을 측정하고, 그 결과를 도 3에 나타내었다.After the ozone gas was administered to 15 ° C. wastewater having a concentration of thiocyanate (SCN-) of 330 ppm with varying dosages as shown in FIG. 3, the treatment for removing thiocyanate ions from the waste water was performed as shown in FIG. 2. , The content of thiocyan ions in the wastewater before sending to the primary sedimentation tank was measured, and the results are shown in FIG.
도 3에 나타난 바와 같이, 오존가스가 투여되면 폐수중의 티오시안 이온이 제거되지만, 보다 효과적으로 제거되기 위해서는 폐수 10ℓ당 70㎖이상 투여되어야 함을 알 수 있다.As shown in FIG. 3, when ozone gas is administered, thiocyan ions in the wastewater are removed, but in order to be more effectively removed, it can be seen that 70 ml or more should be administered per 10 liters of wastewater.
(실시예 2) (Example 2)
티오시안이온 (SCN-) 농도가 330ppm인 화성폐수의 온도를 도 4에서와 같이 변화시키면서 오존가스를 폐수 10ℓ당 75㎖로 투여하여 화성폐수의 티오시안 이온을 제거하는 처리를 도 2에서와 같이 행한 후, 1차 침전조에 보내기 전의 폐수중의 티오시안 이온의 함량을 측정하고, 그 결과를 도 4에 나타내었다.The treatment of removing thiocyanate ions from the wastewater by administering ozone gas at 75 ml per 10 liters of wastewater while changing the temperature of the wastewater having a thiocyanate (SCN-) concentration of 330 ppm as shown in FIG. After carrying out, the content of thiocyanate ions in the wastewater before being sent to the primary precipitation tank was measured, and the results are shown in FIG. 4.
도 4에서의 제거효율은 폐수온도15℃에 함유된 원폐수의 티오시안이온을 기준으로 온도별 처리후의 제거 효율을 100분율로 나타낸 것이다.The removal efficiency in Figure 4 shows the removal efficiency after the treatment for each temperature based on the thiocyanic ions of the raw wastewater contained in the
도 4에 나타난 바와 같이, 화성폐수 온도 15℃와 30℃에서는 티온시안이온 제거효율이 59%와 68%로 다소 낮은 제거효율을 보이고 있으며, 화성폐수 온도 45℃이상에서는 제거 효율이 80%이상을 나타내고 있음을 알 수 있다.As shown in FIG. 4, the removal efficiency of the thiocyanide ion is 59% and 68% at the waste water temperature of 15 ° C. and 30 ° C., and the removal efficiency is more than 80% at the waste water temperature of 45 ° C. or higher. It can be seen that.
따라서, 본 발명에서는 화성폐수의 온도를 45℃이상에서 하여 처리하는 것이 티오시안이온을 제거하는데 바람직함을 알 수 있다. Therefore, in the present invention, it can be seen that it is preferable to remove the thiocyanate by treating the wastewater at a temperature of 45 ° C or higher.
(실시예 3)(Example 3)
티오시안이온 (SCN-) 농도가 330ppm인 45℃의 화성폐수에 폐수 10ℓ당 75㎖ 의 오존가스와 함께 도 5의 투여량조건으로 과산화수소를 투여하여 화성폐수의 티오시안 이온을 제거하는 처리를 도 2에서와 같이 행한 후, 1차 침전조에 보내기 전의 폐수중의 티오시안 이온의 함량을 측정하고, 그 결과를 도 5에 나타내었다.To remove the thiocyanate ions from the wastewater by administering hydrogen peroxide under the dosage condition of FIG. 5 with 75 ml ozone gas per 10 liters of wastewater at 45 ° C. in the thiocyanate (SCN-) concentration of 330 ppm. After performing as in 2, the content of thiocyanate ions in the wastewater before being sent to the primary precipitation tank was measured, and the results are shown in FIG.
도 5에 나타난 바와 같이, 과산화수소를 투입하면, 오존가스만을 투입하는 경우보다 티오시안 이온의 제거효율이 증가되며, 과산화수소의 투여량이 증가할수록 티오시안이온의 제거효율은 증가됨을 알 수 있다.As shown in FIG. 5, when the hydrogen peroxide is added, the removal efficiency of thiocyan ions is increased than when only ozone gas is added, and the removal efficiency of the thiocyan ions is increased as the dosage of hydrogen peroxide is increased.
즉, 과산화수소를 10ℓ당 30ml를 투여시에는 티오시안이온 제거효율이 50%이하를 나타내는데 10ℓ당 40ml 이상을 투여시에는 제거효율이 60%이상을 나타냄을 알 수 있다.That is, when administering 30ml per 10l of hydrogen peroxide, the thiocyanide removal efficiency is 50% or less, and when 40ml / 10l or more is administered, the removal efficiency is 60% or more.
본 발명에서 오존을 투여하면서 과산화수소를 투여하는 경우에는 화성폐수 10ℓ당 과산화수소를 40ml 이상 투여하는 것이 바람직함을 알 수 있다. When hydrogen peroxide is administered while ozone is administered in the present invention, it can be seen that it is preferable to administer 40 ml or more of hydrogen peroxide per 10 liters of waste water.
상술한 바와 같이, 본 발명은 티오시안이온 함유 화성폐수에 오존가스를 투여하므로서 폐수중에 존재하는 티오시안의 농도를 현저히 저감시킬 수 있는 효과가 있는 것이다.As described above, the present invention has an effect of remarkably reducing the concentration of thiocyanate present in the wastewater by administering ozone gas to the thiocyanate-containing chemical wastewater.
또한, 본 발명을 통하여 화성폐수중의 티오시안이온을 제거하는 경우에는 총질소의 량을 저감하여 환경 공해의 유발을 억제할 수 있다.In addition, in the case of removing thiocyan ions in the waste water through the present invention, it is possible to reduce the amount of total nitrogen to suppress the occurrence of environmental pollution.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH1133571A (en) * | 1997-07-17 | 1999-02-09 | Kurita Water Ind Ltd | Wastewater treatment method |
| JP2000153284A (en) | 1998-11-18 | 2000-06-06 | Sumitomo Metal Mining Co Ltd | Treatment of cyan by ozone |
| KR20020096018A (en) * | 2002-06-20 | 2002-12-28 | 주식회사 제이미크론 | Apparatus for treatment waste water of plating and method the same |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH1133571A (en) * | 1997-07-17 | 1999-02-09 | Kurita Water Ind Ltd | Wastewater treatment method |
| JP2000153284A (en) | 1998-11-18 | 2000-06-06 | Sumitomo Metal Mining Co Ltd | Treatment of cyan by ozone |
| KR20020096018A (en) * | 2002-06-20 | 2002-12-28 | 주식회사 제이미크론 | Apparatus for treatment waste water of plating and method the same |
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