KR20040025985A - Technology of manufacturing ceramic catalyst and the way of its use - Google Patents
Technology of manufacturing ceramic catalyst and the way of its use Download PDFInfo
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- KR20040025985A KR20040025985A KR1020020056475A KR20020056475A KR20040025985A KR 20040025985 A KR20040025985 A KR 20040025985A KR 1020020056475 A KR1020020056475 A KR 1020020056475A KR 20020056475 A KR20020056475 A KR 20020056475A KR 20040025985 A KR20040025985 A KR 20040025985A
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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
- C02F1/725—Treatment of water, waste water, or sewage by oxidation by catalytic oxidation
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/86—Catalytic processes
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- B01D53/885—Devices in general for catalytic purification of waste gases
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- B01J37/00—Processes, in general, for preparing catalysts; Processes, in general, for activation of catalysts
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Abstract
Description
본 발명은 페라이트계에 적어도 자성체나 철, 망간, 코발트, 티타늄, 몰리브덴, 알루미늄, 지르코늄, 마그네슘, 규소, 티탄산바륨, 규조토 등의 여러 종류의 금속산화물을 일정한 비율로 조합하여 소결시켜 제조한 세라믹 촉매와 염소(차아염소산나트륨, 차아염소산칼슘, 이산화염소, 염소가스 등)를 함유한 수용액을 촉매충전탑에 통과, 접촉시켜 촉매작용으로 생성된 촉매산화수를 각종 폐수에 혼합수로 이용함으로서 화학약품처리의 일부 또는 완전 대체하고 후단의 생물처리와 연계한 수질 개선, 살균, 탈취 및 배기와 접촉시켜 정화시키는 방법에 관한 것이다.The present invention is a ceramic catalyst prepared by sintering a ferrite-based at least a combination of various kinds of metal oxides such as magnetic material, iron, manganese, cobalt, titanium, molybdenum, aluminum, zirconium, magnesium, silicon, barium titanate, diatomaceous earth, etc. And chlorine (sodium hypochlorite, calcium hypochlorite, chlorine dioxide, chlorine gas, etc.) are passed through a catalytic charging tower and brought into contact with the catalytic charging tower to use the catalytic oxidation water produced by catalysis in various wastewater as mixed water. The present invention relates to a method for purifying by partially or completely replacing and contacting with water quality improvement, sterilization, deodorization and exhaust associated with the subsequent biological treatment.
각종 공산품이나 가공품의 생산과정이나, 혹은 사람들의 일상생활, 농가의 가축사육과정 등에서 필연적으로 발생하게 되는 각종 폐수는 공업화, 도시화에 따라 그 발생량이 갈수록 증가하고 실정이며 그에 따른 환경오염도 더욱 극심해지고 있는 실정이다.Wastewater, which is inevitably generated in the process of producing various industrial products or processed products, or in people's daily life, farming, and livestock raising of farms, is increasing in proportion to industrialization and urbanization, and environmental pollution is becoming more severe. It is true.
따라서, 폐수로 인한 환경오염을 방지하기 위해서 전 세계 거의 대부분의 국가에서는, 폐수가 발생하는 사업장이나 시설 등에 대하여 폐수처리시설의 설치를의무화하고 있으며 이에 대한 규정은 국내에서도 각종 법규 등을 통해 의무화하고 있는 실정이다.Therefore, in order to prevent environmental pollution due to wastewater, almost all countries in the world are obliged to install wastewater treatment facilities at workplaces and facilities where wastewater is generated. There is a situation.
그러나, 일반적인 폐수처리 시설의 경우, 초기 시설에 많은 비용이 소요될 뿐 만 아니라, 폐수처리 시설의 유지 및 관리에도 시설운영비 뿐 만 아니라 폐수 처리에 필요한 각종 약품의 구입 및, 처리과정에서 부가적으로 발생하는 슬러지 등의 처리 등으로 인해 많은 비용이 소요되기 때문에, 고가의 비용을 들여 폐수처리 시설을 갖춘 후에도 이러한 시설들을 제대로 활용하지 않고, 폐수를 무단으로 방류하거나 또는 제대로 정화처리도 하지 않은 체 법정 방류 기준치 이상의 폐수를 그대로 방류하는 사례가 매우 빈번히 발생하고 있는 실정이다.However, in the case of general wastewater treatment facilities, not only a lot of costs are required for the initial facilities, but also the maintenance and management of wastewater treatment facilities, as well as facility operation costs, and additionally occur in the purchase and treatment of various chemicals required for wastewater treatment. Because of the high cost due to the treatment of sludge, etc., it is not necessary to utilize these facilities even after the wastewater treatment facilities are installed at a high cost, and to discharge the wastewater without unauthorized discharge or purification. It is a very frequent case that the discharge of wastewater above the standard value as it is.
본 발명은 위와 같은 종래의 문제점을 해소한 발명으로서, 기능성 세라믹의 일종인 세라믹 촉매를 이용한 간단한 구성의 촉매장치에 의해 촉매산화수를 생성하고 수질 개선, 살균, 탈취 및 배기의 정화를 효율적으로 할 수 있도록 한 것이다.The present invention solves the above-mentioned conventional problems, it is possible to produce a catalytic oxidation water by using a catalytic device of a simple configuration using a ceramic catalyst which is a kind of functional ceramic, and to improve the water quality, sterilization, deodorization and exhaust purification efficiently. It would be.
그 때문에 본 발명은, 세라믹 촉매의 촉매산화수를 이용한 처리시스템에 있어서 정화처리를 위한 처리부와 바인더로서 수지나 유리를 사용하고 적어도 페라이트계에 자성체, 철, 몰리브덴, 코발트, 티타늄, 마그네슘, 알루미늄, 칼륨, 지르코늄, 규소, 텅스텐, 크롬의 금속산화물을 조합시켜 소결한 제 1입자, 페라이트계에 적어도 자성체와 철, 망간, 코발트, 티타늄, 마그네슘, 알루미늄, 칼륨, 지르코늄, 규소, 칼슘, 게르마늄의 금속산화물을 조합시켜 소결한 제 2입자, 적어도 산화알루미늄, 산화지르코늄, 규조토, 티탄산바륨의 금속산화물을 조합시켜 소결한 제 3입자로 된 3종류의 세라믹 촉매를 촉매충전탑에 담아 촉매충전탑 하부에서 염소를 함유한 수용액을 도입하고 촉매와 접촉시켜 생성된 촉매산화수를 각종 폐수에 혼합수로 이용함으로서 화학약품처리의 일부 또는 완전 대체하고 후단의 생물처리와 연계한 수질 개선, 살균, 탈취 및 배기와 접촉시켜 정화시키는 것을 특징으로 한다.Therefore, the present invention uses a resin or glass as a treatment part and a binder for purifying treatment in a treatment system using catalytic oxidation of a ceramic catalyst, and at least ferrite-based magnetic material, iron, molybdenum, cobalt, titanium, magnesium, aluminum, potassium The first particles sintered by combining metal oxides of zirconium, silicon, tungsten and chromium, ferrite-based at least magnetic material, iron, manganese, cobalt, titanium, magnesium, aluminum, potassium, zirconium, silicon, calcium and germanium Sintered second particles, at least aluminum oxide, zirconium oxide, diatomaceous earth, barium titanate, and three kinds of ceramic catalysts consisting of sintered third particles in a catalyst packed tower By introducing an aqueous solution containing a solution and contacting with a catalyst, the catalytic oxidation water is used as mixed water in various wastewaters. Alternative medicine part or full of processes, and is characterized in that for purifying contacted with biological treatment in connection with water quality at the rear end, sterilization, deodorization and the exhaust.
기능성 세라믹의 일종인 세라믹촉매를 촉매충전탑에 담아 촉매충전탑 하부에서 염소를 함유한 수용액을 도입하고 촉매와 접촉시켜 생성된 촉매산화수를 각종 폐수에 혼합수로 이용함으로서 화학약품처리의 일부 또는 완전 대체하고 후단의 생물처리와 연계한 수질 개선, 살균, 탈취 및 배기와 접촉시켜 정화시키는 공정으로 구성되어 있다.Partial or complete chemical treatment by placing ceramic catalyst, which is a kind of functional ceramic, in the catalyst filling tower, introducing an aqueous solution containing chlorine from the bottom of the catalyst filling tower, and contacting the catalyst with the catalytic oxidation water as mixed water in various wastewater. It consists of a process of water purification, sterilization, deodorization and contact with the exhaust, which is linked to the subsequent biological treatment.
기능성 세라믹 촉매는 성분 농도가 다른 여러 종의 금속산화물을 혼합한 것으로 제 1입자는 페라이트계에 적어도 자성체, 철, 몰리브덴, 코발트, 티타늄, 마그네슘, 알루미늄, 칼륨, 지르코늄, 규소, 텅스텐, 크롬의 금속산화물을 조합시켜 소결하였고, 제 2입자는 페라이트계에 적어도 자성체와 철, 망간, 코발트, 티타늄, 마그네슘, 알루미늄, 칼륨, 지르코늄, 규소, 칼슘, 게르마늄의 금속산화물을 조합시켜 소결하였고, 제 3입자는 적어도 산화알루미늄, 산화지르코늄, 규조토, 티탄산바륨의 금속산화물을 조합시켜 소결하였다.The functional ceramic catalyst is a mixture of various metal oxides having different component concentrations. The first particles are ferrite-based metals of at least magnetic material, iron, molybdenum, cobalt, titanium, magnesium, aluminum, potassium, zirconium, silicon, tungsten and chromium. Oxides were combined and sintered, and the second particles were sintered by combining a ferrite-based at least magnetic material with metal oxides of iron, manganese, cobalt, titanium, magnesium, aluminum, potassium, zirconium, silicon, calcium, and germanium. Was sintered by combining at least a metal oxide of aluminum oxide, zirconium oxide, diatomaceous earth, and barium titanate.
또한 촉매충전탑에 도입한 염소 함유 수용액의 유효염소 농도는 0.5 ~1000ppm 정도를 첨가 혼합한 것이다. 염소 농도는 정화 대상의 종류와 정화 정도에 따라 변화시켜 사용할 수 있지만 통상적으로 1 ~ 수십ppm에서 사용하여도 그 효과를 충분히 얻을 수 있다.In addition, the effective chlorine concentration of the chlorine-containing aqueous solution introduced into the catalyst packed column is about 0.5 to 1000 ppm added and mixed. The chlorine concentration can be changed depending on the type of purification target and the degree of purification, but the effect can be sufficiently obtained even when used at 1 to several tens of ppm.
이와 같이 된 본 발명은 세라믹 촉매를 촉매충전탑 내부에 충전한 후, 적정농도의 염소를 함유한 수용액을 촉매충전탑에 통과, 접촉시키면 세라믹촉매의 촉매작용에 의하여 염소(NaOCl 혹은 Cl2)를 함유한 수용액은 촉매산화수로 변환하게 된다. 이러한 촉매산화수의 반응에 관하여 설명하면 다음과 같다.According to the present invention as described above, after filling the ceramic catalyst inside the catalyst packed column, an aqueous solution containing an appropriate concentration of chlorine is passed through the catalyst packed column and brought into contact with the catalyst to form chlorine (NaOCl or Cl 2) by the catalytic action of the ceramic catalyst. The aqueous solution contained is converted into catalytic oxidation water. Referring to the reaction of the catalytic oxidation water is as follows.
반응식 1Scheme 1
NaOCl + H2O → NaOH + HOClNaOCl + H 2 O → NaOH + HOCl
Cl2+ H2O → HClO + HClCl 2 + H 2 O → HClO + HCl
HOCl → HCl + OHOCl → HCl + O
HOCl ←---→ H+ + OCl- HOCl ← --- → H + + OCl -
차아염소산나트륨(혹은 염소)을 물에 용해시키면 반응식 1과 같이 차아염소산나트륨은 수산화나트륨(NaOH)과, 차아염소산(HOCl)으로 분해된 차아염소산나트륨 수용액이 만들어지고 알칼리성이 된다. 이 반응은 극히 느리고, 보통의 상태에서는 용이하게 오른쪽 방향으로 진행하지 않지만 세라믹 촉매는 오른쪽 방향의 반응을 현저하게 촉진한 촉매로 작용한다. 그리고 차아염소산이 분해하고 발생기의 산소를 발생하고, 이 산소가 강력한 산화작용을 나타낸다. 이 촉매산화수는 일반적인 염소계보다 최고 80배 정도의 강력한 산화력을 지니고 있기 때문에 폐수의 수질정화, 살균, 탈취 및 배기의 정화기능을 수행하게 된다.When sodium hypochlorite (or chlorine) is dissolved in water, sodium hypochlorite is made into sodium hydroxide (NaOH) and sodium hypochlorite (HOCl), and becomes alkaline as shown in Scheme 1. This reaction is extremely slow and does not easily proceed in the right direction under normal conditions, but the ceramic catalyst acts as a catalyst which markedly promotes the reaction in the right direction. Hypochlorous acid decomposes and generates oxygen in the generator, and this oxygen shows a strong oxidation. This catalytic oxidation water has up to 80 times more powerful oxidizing power than the general chlorine system, so it performs water purification, sterilization, deodorization and exhaust purification.
다음에 1 ~ 10ppm 정도의 차아염소산나트륨 수용액을 세라믹 촉매에 통과 접촉시킨 촉매산화수에 의한 작용, 효과에 대하여 설명한다.Next, the effect and effect by the catalytic oxidation water which made the sodium hypochlorite aqueous solution about 1-10 ppm pass and contacted the ceramic catalyst are demonstrated.
화장실의 불쾌취의 주성분은 스카톨(3-Methylindole)이고 -NH의 관능기에 때문에 약 알칼리성을 나타낸다. 이 스카톨은 차아염소산나트륨(혹은 염소) 수용액과 촉매에 의해 생성된 HCl과 반응하고 스카톨염을 생성한다. 이 아민염은 무취로 가용성으로 된다.The main component of the toilet's odor is 3-Methylindole, which is slightly alkaline due to the functional group of -NH. This scohol reacts with aqueous sodium hypochlorite (or chlorine) solution and HCl produced by the catalyst and produces a scotol salt. This amine salt becomes odorless and soluble.
반응식 2 C9H9N + HCl → C9H9N·HClScheme 2 C 9 H 9 N + HCl → C 9 H 9 NHCl
또 배설취의 하나인 암모니아는 차아염소산나트륨(혹은 염소) 수용액과 촉매에 의해 생성된 차아염소산(HOCl)과 반응하고 암모니아는 분해되어 냄새가 없어진다.In addition, ammonia, which is one of the excretion odors, reacts with sodium hypochlorite (or chlorine) aqueous solution and the hypochlorous acid (HOCl) produced by the catalyst, and ammonia is decomposed and odorless.
반응식 3 2NH4 ++ 3HClO → N2+ 3H2O + 5H++ 3Cl- Scheme 3 2NH 4 + + 3HClO → N 2 + 3H 2 O + 5H + + 3Cl -
또한, 황화수소(H2S)는 아래와 같이 촉매산화수와 반응하여 탈취된다.In addition, hydrogen sulfide (H 2 S) is deodorized by reaction with catalytic oxidation water as follows.
반응식 4Scheme 4
H2S + NaOH → NaHS + H2OH 2 S + NaOH → NaHS + H 2 O
NaHS + NaOH → Na2S + H2ONaHS + NaOH → Na 2 S + H 2 O
Na2S + 4NaOCl → Na2SO4+ 4NaClNa 2 S + 4 NaOCl → Na 2 SO 4 + 4NaCl
Na2S + NaOCl + H2O → NaCl + NaOH + SNa 2 S + NaOCl + H 2 O → NaCl + NaOH + S
전술한 반응식 1에 의해 생성된 촉매산화수의 발생기 산소는 Cl2가스, HOCl에 비하여 활성이기 때문에 살균 능력이 높다. 사우나에 병설된 목욕탕(1일 2,000인 이용)에 적용한 결과, 아래의 표와 같이 현저한 효과를 나타내었다.The generator oxygen of the catalytic oxidation water produced by the above-mentioned Scheme 1 has high sterilization ability because it is active compared to Cl 2 gas and HOCl. As a result of application to the bathhouse (2,000 persons per day) attached to the sauna, it showed a remarkable effect as shown in the table below.
골프장의 저수지(분수 연못)에 대하여 촉매산화수를 사용하면 녹조가 없어지고 물이 투명하게 되었고, 살수로 사용한 결과, 잎이 시들고 마르는 병, 해충이 적어짐에 따라 무농약화를 도모하는 것이 가능하다.The use of catalytic oxidation for the reservoir (fountain pond) of the golf course makes the green algae disappear and the water becomes transparent. As a result of the use of watering, it is possible to achieve pesticide-free as the leaves wither, dry and less pests.
또한 촉매산화수를 배기통이나 배연 통, 공기청정기의 공기 도입부에 분무시켜 공급하거나, 배기통이나 배연 통, 공기청정기의 공기 도입부를 촉매산화수 물속에 도입하고 배기나 배연, 공기를 기포로 하여 통과시키는 것에 의해 배기나 배연, 도입 공기의 정화에 이용하도록 구성해도 좋다.In addition, the catalyst oxidation water is sprayed and supplied to the air inlet of the exhaust, flue, and air purifiers, or the air inlet of the exhaust, flue, and air cleaners is introduced into the catalytic oxidation water and passed through the exhaust, flue gas, and air as bubbles. You may comprise so that it may use for purification of exhaust, flue gas, and introduction air.
세라믹 촉매를 이용한 고농도 종합염색폐수 처리시 유기물 부하량 중 BOD, SS 등에 비해 COD 및 색도는 처리효율이 상대적으로 낮아서 장기간의 생물처리 공정으로 처리하는 경우보다는, 세라믹 촉매공정으로 전처리된 염색폐수를 20~ 30%의 화학약품으로 처리한 후, 후단의 미생물처리(혹은 오존, R/O처리 등)공정을 도입하면 화학약품비 및 슬러지 처리비가 대폭 절감되는 처리가 가능하여 총량규제를 만족시키는 경제적이고 효율적인 고도처리 공정을 구성할 수 있다.Compared to BOD and SS among organic loads, COD and color have relatively low treatment efficiency when treating high concentration synthetic dye wastewater using ceramic catalyst, so that dyeing wastewater pretreated by ceramic catalyst process is 20 ~ After treatment with 30% of chemicals, the introduction of microorganism treatment (or ozone, R / O treatment, etc.) at the next stage enables the treatment to significantly reduce chemical and sludge treatment costs, which is economical and efficient. The treatment process can be configured.
그 밖에 축산의 입하 때의 몸세척, 트랙 세척, 탈취, 장내 소독, 오물의 세척 배출 등에 촉매산화수를 사용하는 것에 의해 탈취나 수질 개선의 정화 효과를 높이는 것이 가능하고 유수분리조의 n-Hex 개선, 염소 냄새와 살균작용이 우수한 수영 풀, 염소냄새가 없는 제빙수, 무균실(수술실, 치료실, 식품가공실)에도 현저한 효과가 확인되고 있다.In addition, it is possible to enhance the deodorizing and water quality purification effect by using catalytic oxidation water for washing the body at the time of stock raising, track washing, deodorization, intestinal disinfection, and washing and discharging of dirt, and improving n-Hex of oil and water separation tank, Significant effects have been confirmed in swimming pools with excellent chlorine odor and sterilization, ice-free water without chlorine smell, and aseptic rooms (operating room, treatment room, food processing room).
따라서 본 발명은 페라이트계에 적어도 자성체, 철, 몰리브덴, 코발트, 티타늄, 마그네슘, 알루미늄, 칼륨, 지르코늄, 규소, 텅스텐, 크롬의 금속산화물을 조합시켜 소결한 제 1입자, 페라이트계에 적어도 자성체와 철, 망간, 코발트, 티타늄, 마그네슘, 알루미늄, 칼륨, 지르코늄, 규소, 칼슘, 게르마늄의 금속산화물을 조합시켜 소결한 제 2입자, 적어도 산화알루미늄, 산화지르코늄, 규조토, 티탄산바륨의 금속산화물을 조합시켜 소결한 제 3입자로 된 3종류의 세라믹 촉매를 촉매충전탑에 담고 하부로부터 염소(차아염소산나트륨, 차아염소산칼슘, 이산화염소, 염소가스 등)를 함유한 수용액을 촉매충전탑에 통과, 접촉시켜 촉매작용으로 생성된 촉매산화수를 각종 폐수와 혼합수로 이용함으로서 수처리 분야에서는 화학약품처리의 일부 또는 완전 대체하고 후단의 생물처리와 연계한 수질 개선, 탈염소취 (수영 풀), 살균적용의 향상(대중 목욕탕, 수영 풀, 골프장 그린), 공기를 매체로 한 분야에서는 상쾌한 공조, 무균실, 악취 제거, 배기의 정화에 현저한 효과가 있는 것으로 확인되고 있다.Accordingly, the present invention provides at least magnetic material and iron to ferrite-based first particles and ferrites, which are sintered by combining ferrite-based at least magnetic oxides, metal oxides of iron, molybdenum, cobalt, titanium, magnesium, aluminum, potassium, zirconium, silicon, tungsten and chromium. Sintered by combining metal oxides of manganese, cobalt, titanium, magnesium, aluminum, potassium, zirconium, silicon, calcium, germanium, at least a second particle, at least aluminum oxide, zirconium oxide, diatomaceous earth, barium titanate Three types of ceramic catalysts of one third particle were placed in a catalyst packed tower, and an aqueous solution containing chlorine (sodium hypochlorite, calcium hypochlorite, chlorine dioxide, chlorine gas, etc.) was passed through the catalyst packed tower and contacted therefrom. By using catalytically generated oxidized water as wastewater and mixed water, it is possible to partially or completely replace chemical treatment in the water treatment field. Improved water quality, dechlorination (swimming pool), sterilization application (public bath, swimming pool, golf course green) in connection with the biological treatment of the latter stage, air conditioning, fresh air conditioning, clean room, odor removal, exhaust purification It is confirmed that there is a remarkable effect.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101108695B1 (en) * | 2009-12-24 | 2012-01-25 | 한국원자력연구원 | The catalyst with metal oxide-hydride for decomposition of hypochlorite ions, the method for preparation of the same and the method for preparation of catalyst structure |
| KR101362080B1 (en) * | 2013-08-08 | 2014-02-12 | 주식회사 금영이엔텍 | The exclusion system for complex bad smell of food and drink waste |
| KR101391410B1 (en) * | 2012-09-28 | 2014-09-01 | 주식회사 코아 에프앤티 | Refinery system for bio gas comtaining malodorous substance and siloxane gas |
| KR20160042774A (en) * | 2014-10-10 | 2016-04-20 | 정동수 | Wastewater treatment system improving T-N quality of effluent water through pre-treatment of reducing nitrogen in returning water from dehydration process at the digestion tank of community sewage disposal plant |
| CN114768825A (en) * | 2022-05-25 | 2022-07-22 | 福建省金皇环保科技有限公司 | Preparation method of industrial wastewater catalytic oxidation catalyst |
-
2002
- 2002-09-17 KR KR1020020056475A patent/KR20040025985A/en not_active Application Discontinuation
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101108695B1 (en) * | 2009-12-24 | 2012-01-25 | 한국원자력연구원 | The catalyst with metal oxide-hydride for decomposition of hypochlorite ions, the method for preparation of the same and the method for preparation of catalyst structure |
| KR101391410B1 (en) * | 2012-09-28 | 2014-09-01 | 주식회사 코아 에프앤티 | Refinery system for bio gas comtaining malodorous substance and siloxane gas |
| KR101362080B1 (en) * | 2013-08-08 | 2014-02-12 | 주식회사 금영이엔텍 | The exclusion system for complex bad smell of food and drink waste |
| KR20160042774A (en) * | 2014-10-10 | 2016-04-20 | 정동수 | Wastewater treatment system improving T-N quality of effluent water through pre-treatment of reducing nitrogen in returning water from dehydration process at the digestion tank of community sewage disposal plant |
| CN114768825A (en) * | 2022-05-25 | 2022-07-22 | 福建省金皇环保科技有限公司 | Preparation method of industrial wastewater catalytic oxidation catalyst |
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