KR100198028B1 - Nitrogen removal method of organic wastewater with high concentration in liquid phase corrosive method - Google Patents
Nitrogen removal method of organic wastewater with high concentration in liquid phase corrosive method Download PDFInfo
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- KR100198028B1 KR100198028B1 KR1019960064730A KR19960064730A KR100198028B1 KR 100198028 B1 KR100198028 B1 KR 100198028B1 KR 1019960064730 A KR1019960064730 A KR 1019960064730A KR 19960064730 A KR19960064730 A KR 19960064730A KR 100198028 B1 KR100198028 B1 KR 100198028B1
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- 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
- C02F3/305—Nitrification and denitrification treatment characterised by the denitrification
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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
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/02—Aerobic processes
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- C02F3/1205—Particular type of activated sludge processes
- C02F3/121—Multistep treatment
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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- C02F2103/005—Black water originating from toilets
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Abstract
본 발명은 환경 오염원으로서 큰 부분을 차지하는 사람, 가축의 분뇨나 기타 고농도 유기오수를 액상부식법에 의하여 고액 분리한 후 액체부분을 방류수 수질기준에 적합한 정수가 되도록 처리함에 있어서 방류수내의 질소화합물을 효과적으로 처리 제거하는 고농도 유기오수의 질소 제거방법에 관한 것이다.The present invention effectively removes nitrogen compounds in the effluent by treating liquid parts to be purified water according to the water quality standard after solid-liquid separation of manure, livestock manure or other high-concentration organic sewage, which takes a large part as environmental pollution sources. It relates to a nitrogen removal method of high concentration organic sewage to be treated and removed.
1개의 생물반응조(액상부식조)에서 교반(무산소처리)과 포기(호기성처리)를 교대로 실시하되 1일 2싸이클 ~ 수싸이클로 운전하도록 하고 고농도 유기오수(원수) 투입은 매교반(무산소처리)과 동시에 개시하고 적어도 교반정지 이전에 투입을 종료하며, 매 교반시의 투입량은 1일 처리할 고농도 유기오수 총량을 1일의 싸이클수로 나눈량으로 하여, 처리가 완료된 고농도 유기오수(처리액)는 1일 24시간 주기로 일시에 호기성처리(포기)시 배출하는 것을 특징으로 하는 고농도 유기오수의 질소제거방법에 관한 것이다.In one bioreactor (liquid corrosion bath), agitation (oxygen treatment) and aeration (aerobic treatment) are performed alternately, but operate two cycles to several cycles a day, and high concentration organic sewage (raw water) input is stirred every time (oxygen treatment). At the same time, and at least before the stopping of the stirring, the input amount at each stirring is the total amount of high concentration organic sewage to be treated per day divided by the number of cycles per day. The present invention relates to a nitrogen removal method of high concentration organic sewage, which is discharged during aerobic treatment (aeration) at a time 24 hours a day.
Description
본 발명은 환경오염원으로서 큰 부분을 차지하는 사람, 가축의 분뇨나 기타 유기오수를 액상부식법에 의하여 고액 분리한 후 액체부분을 방류수 수질기준에 적합한 정수가 되도록 처리함에 있어서 방류수내의 질소화합물을 효과적으로 처리 제거하는 고농도 유기오수의 질소 제거방법에 관한 것이다.The present invention effectively treats nitrogen compounds in effluents by solid-liquid separation of manure, livestock manure, and other organic wastewater, which occupy a large part as environmental pollutants by liquid erosion, so that the liquid portion is purified to meet water quality standards. It relates to a nitrogen removal method of high concentration organic sewage to be removed.
종래 분뇨등 고농도 유기오수의 처리에서 산화작용, 동화작용을 거쳐 정화처리된 방류수는 pH, SS, BOD, 대장균 군수 등에 있어서는 방류수 수질 기준에 적합하였으나, 방류수 수계인 하천, 호수 및 해역의 부영양화 등의 문제를 야기하는 질소화합물은 거의 제거하지 못하였다.In the conventional treatment of high concentration organic sewage such as manure, the effluent purified through oxidation and assimilation was suitable for the standard of effluent water quality in pH, SS, BOD, E. coli, etc., but the eutrophication of effluent water streams, lakes and sea areas Nitrogen compounds that cause problems were rarely removed.
즉, pH, SS, BOD, 대장균 군수 등이 수질기준에 적합하더라도 질소화합물에 의한 부영양화는 벼의 질소과잉에 의한 식생장애나 어업에 큰 피해를 줄뿐만 아니라 음료수나 공업용수로서 이용하기에 적합하지 않은 것이다.In other words, even if pH, SS, BOD, Escherichia coli counts, etc. meet the water quality standards, eutrophication by nitrogenous compounds is not only suitable for drinking water or industrial water as well as damaging vegetation disorders or fisheries caused by excess nitrogen of rice. It is not.
그리하여 특허 제77897호(1994. 7. 20. 자 특허공고 제 94-6403호)에서는 상기의 고농도 유기오수를 약 16시간 동안 포기하여 함유된 유기태질소 및 암모니아성 질소를 산화시키고 약 2시간동안 수중교반함으로서 산화질소 또는 질소가스로 환원시켜 대기중에 방산한 후 1일 처리량을 다음 공정으로 이송하고 전처리된 동량의 유기오수를 새로 투입하여 혐기성 조건하에서 약 6시간 동안 수중교반한 후 다시 상기의 호기성 조건을 만들어 탈질하는 과정을 1일 주기로 반복하는 방법 및 여기에서 액상 부식조로부터 이송된 처리수의 일부는 공기가 과잉용해된 가압수로 형성된 미세기포에 의하여 부식화된 오니가 분리되는 가압부상 분리장치등으로 농축하고 농축된 오니를 액상부식조에 반송함을 특징으로 하는 방법이 제안되었다.Thus, Patent No. 77897 (Patent Publication No. 94-6403) issued the above-mentioned high concentration organic sewage for about 16 hours to oxidize the organic nitrogen and ammonia nitrogen contained therein and for about 2 hours in water. After stirring, it is reduced to nitric oxide or nitrogen gas and dissipated into the air, and then the daily throughput is transferred to the next process, and the same amount of pre-treated organic sewage is introduced and stirred in water for about 6 hours under anaerobic conditions, and then again the above aerobic conditions Method to repeat the process of denitrification by making a daily cycle and a part of the treated water transferred from the liquid corrosion tank is a pressurized flotation separation device is separated from the sludge corroded by the micro-bubble formed by pressurized water over-dissolved air A method characterized by concentrating and returning the concentrated sludge to a liquid corrosion vessel has been proposed.
그러나 상기 특허에 있어서의 질소제거방법은 1개의 액상부식조에서 1일 처리량의 고농도 유기오수(이하 원수라 약칭한다)를 1회 단시간에 생물반응조인 액상부식조에 투입하여 순차적인 일정시간(6시간) 혐기성 조건하에서 수중교반하고 원수중의 유기성탄소(BOD성분)를 이용하여 전일(前日) 질산화된 질소를 제거하며 다시 일정시간(16시간)포기(aeration)하여 당일 투입된 고농도 유기오수증의 암모니아성 질소를 질산화한 다음 포기를 중지하고 2시간 동안 교반하여 내생호흡을 이용한 탈질 후, 처리액을 단시간에 배출하여 후속처리하고 배출직후 도량의 유입폐수 원수를 투입해 상술한 바와 같은 처리를 반복하는 것을 특징으로 한 것인바, 이러한 방법은 다음과 같은 피할 수 없는 단점이 내재되어 있다.However, the method for removing nitrogen in the above patent is to inject a high-concentration organic sewage (hereinafter referred to as raw water) of a daily throughput in one liquid corrosion tank into a liquid corrosion tank which is a bioreaction tank in one short time, and then sequentially sequentially (6 hours ) Ammonia nitrogen of high concentration organic sewage pumped on the same day by agitating under water under anaerobic conditions and removing nitrified nitrogen from raw water by using organic carbon (BOD component) in raw water and aeration for a certain time (16 hours) After nitrifying and stopping the abandonment and stirring for 2 hours, after denitrification using endogenous breathing, the treatment solution was discharged in a short time for subsequent treatment, and immediately after the discharge, the raw wastewater was introduced in a large amount, and the treatment as described above was repeated. This method is inherent in the following inevitable disadvantages.
첫째 : 1일 처리할 고농도 유기오수를 1일 1회 단시간에 투입하는데 따르는 단점이 있었다.First: There was a drawback of putting high concentration organic sewage to be treated in a short time once a day.
즉 투입펌프 및 관련 배관설비가 1일 수차례 장시간에 걸쳐 투입할 때에 비해 대용량이 필요하여 시설투자비와 유지관리 동력비가 그만큼 더 소요되었고 BOD-MLSS부하, TN-MLSS부하 등 각종 부하가 원수투입 초기에는 과부하, 처리말기에는 빈부하상태의 운전이 반복되어 처리효율이 저하되고 따라서 소정의 처리수를 얻기 위해서는 그만큼 장기간의 처리가 필요하여 결국 생물반응조(액상부식조)의 용량이 커지고 아울러 교반기, 블로우어 등의 용량이 커져서 초기투자비, 유지관리비 등이 더 소요되었다.That is, a large capacity is required compared to when the input pump and related piping equipment are put in for a long time several times a day, so the facility investment cost and maintenance power cost are much higher, and various loads such as BOD-MLSS load and TN-MLSS load are initially introduced. In the process of overload and end of treatment, the operation of empty load is repeated and treatment efficiency decreases. Therefore, in order to obtain a predetermined treatment water, a long-term treatment is required. Consequently, the capacity of the bioreactor (liquid corrosion tank) increases, and agitator and blow Due to the increased capacity of fish, the initial investment and maintenance costs were more required.
둘째 : 1일 1싸이클 동안 16시간은 포기, 8시간은 교반을 하므로 16시간은 연속적으로 블로우어를 가동하고 8시간은 연속적으로 교반장치를 가동하게 되어 기계적인 무리가 따랐다.Second: 16 hours abandoned and 8 hours agitated during 1 cycle a day, 16 hours of continuous blower operation and 8 hours of continuous agitating device, followed by mechanical crowd.
셋째 : 1일 1싸이클 운전에 의한 처리수의 질소농도는 투입원수의 질소량(무게)을 조의 용량으로 나눈 농도이하로는 저하되지 않기 때문에 결국 투입된 질소총량과 처리수의 질소총량은 변함이 없고, 암모니아성 질소가 산화태질소(질산성질소 + 아질산성질소)로 형태만 바뀐채 방류되는 결과가 되는 것이었다.Third: Since the nitrogen concentration of the treated water by one cycle operation per day does not fall below the concentration of the nitrogen (weight) of the input water divided by the capacity of the tank, the total amount of nitrogen introduced and the total nitrogen of the treated water remain unchanged. The result was that the ammonia nitrogen was discharged with only the form changed to nitric oxide (nitrogen nitrogen + nitrite nitrogen).
따라서 일정농도 이하로 처리수의 질소농도를 낮추기 위해서는 생물반응조(액상부식조)의 용량을 그만큼 더 증가시켜야만 하였다.Therefore, in order to lower the nitrogen concentration of the treated water below a certain concentration, the capacity of the bioreactor (liquid corrosion tank) had to be increased by that much.
이를 도식을 이용하여 좀 더 상세하게 설명하면 다음과 같다.This will be described in more detail using the schematic as follows.
즉 이와 같은 현상은 1일 1싸이클 운전을 하고 질산화된 산화태질소를 탈질하는데 필요한 유기성 탄소원으로 외부의 질소가 포함되어 있지 않는 유기물(예 : 메탄올)을 사용하지 않고, 질소를 포함하고 있는 유기성 폐수인 원수자체가 갖고 있는 유기성탄소(BOD물질)를 이용하여 탈질을 할 때는 물리적으로 피할 수 없는 현상이었던 것이다.That is, the organic wastewater containing nitrogen without using organic matter (eg, methanol) that does not contain external nitrogen as an organic carbon source necessary for one cycle operation and denitrification of nitrified nitric oxide. When denitrification using organic carbon (BOD material) owned by the source itself was a phenomenon that could not be physically avoided.
본 발명은 이와 같은 종래기술(특허공보 NO. 94-6403)이 갖고 있는 구조적 단점을 보완한 것으로 이를 상세히 설명하면 다음과 같다.The present invention complements the structural disadvantages of the prior art (Patent Publication No. 94-6403) as described in detail as follows.
본 발명은 1일 1싸이클로 운전하지 않고 1일 2~수싸이클(예를 들면 4~6싸이클)로 운전하며 고농도 유기성오수(원수)의 투입을 1일 1회 단시간에 하지 않고 매교반이 시작됨과 동시에 투입하여 교반종료 30분~1시간전에 투입을 완료하도록 하므로서 1일을 기준으로 교반(6시간) → 포기(16시간) → 교반(6시간)으로 1싸이클이 진행되었던 것을 예를 들면 1일 4싸이클 운전을 하면 2시간 교반후 4시간 포기하는 것을 1싸이클로 1일 4번 수행하는 것이다.The present invention does not operate with one cycle per day, and operates with 2 to several cycles (for example, 4 to 6 cycles) per day, and does not start the injection of high concentration organic wastewater (raw water) in a short time once a day. At the same time, the cycle was completed 30 minutes to 1 hour before the end of stirring, so that one cycle was performed by stirring (6 hours) → aeration (16 hours) → stirring (6 hours) on the basis of 1 day. In a four-cycle operation, giving up four hours after agitation for two hours is performed four times a day with one cycle.
이를 도식을 이용해서 설명하면 다음과 같다.This is explained using a schematic as follows.
상기와 같이 1일 4싸이클 운전하면 전체의 포기(호기성처리)는 1일 16시간, 교반(무산소처리)은 8시간으로 종래의 기술(발명 공보번호 94-6403)의 경우와 포기와 교반시간은 전체적으로는 동일하나 고농도 유기오수(원수) 투입시간은 1.5시간 4회에 걸쳐 투입하므로 전체적으로 6시간에 걸쳐서 투입을 수행하게 된다.As described above, when four cycles are operated per day, the whole aeration (aerobic treatment) is 16 hours a day, and the agitation (anoxic treatment) is 8 hours. In general, the input time of high concentration organic sewage (raw water) is input for 4 times of 1.5 hours, so the input is performed for 6 hours as a whole.
여기에서 1일 24시간을 상단부와 같이 0시~6시, 6시~12시, 12시~18시, 18시~24시로 4싸이클로 구분하고 1싸이클내에서 초기 2시간은 혐기성조건하에서 교반하고 이어서 4시간을 호기성처리(포기)를 하는 과정을 반복하며 이때 고농도 유기오수(원수)는 매 싸이클마다 교반과 동시에 액상부식조에 투입을 개시하여 1.5시간 계속 투입하되 적어도 교반정지 이전에 투입을 종료하도록 한다.Here, 24 hours a day is divided into 4 cycles from 0 to 6 hours, 6 to 12 hours, 12 to 18 hours, 18:00 to 24 hours as in the upper part, and the first 2 hours in one cycle is stirred under anaerobic conditions. Then, the process of aerobic treatment (aeration) is repeated for 4 hours. At this time, the high concentration organic sewage (raw water) starts to be added to the liquid corrosion tank at the same time as the agitation, and continues to be added for 1.5 hours. do.
이때 고농도 유기오수(원수)의 1싸이클마다 투입액은 1일 처리할 고농도 유기오수총량을 1일 싸이클수로 나눈 량으로 하며 한편 처리가 완료된 고농도 유기오수(처리액)은 1일 24시간 주기로 일시에 포기 처리시 배출하는 것이다.At this time, the input liquid for each cycle of high concentration organic sewage (raw water) is the amount of high concentration organic sewage to be treated per day divided by the number of cycles per day. It is to be discharged during aeration.
상술한 바와 같이 1일 2싸이클~수싸이클 반복 운전을 하고 고농도 유기오수(원수)를 싸이클 횟수만큼 균등하게 나눈 량으로 투입함으로 단시간, 예를 들어 30분에 1일 처리량을 투입할 때에 비해 6시간에 걸쳐 투입하는 경우는 각종 부하가 1/12로 저하되는 결과가 되므로 효율이 향상되고 투입설비도 그만큼 용량이 축소된다.As described above, by repeating two cycles to several cycles per day and adding high-concentration organic sewage (raw water) equally divided by the number of cycles, a short time, for example, 6 hours compared to a daily input of 30 minutes In the case of over-loading, various loads are reduced to 1/12, so the efficiency is improved and the capacity is also reduced.
한편 1일 수싸이클을 반복시킴으로 당일 투입된 원수중의 질소는 당일 질산화되고 또한 당일 투입된 원수중의 유기성탄소(BOD물질)를 이용하여 탈질되므로 처리수중의 질소농도는 종래보다 훨씬 낮은 농도를 유지할 수 있다.On the other hand, by repeating several cycles per day, nitrogen in raw water added on the day is nitrified on the day and denitrified using organic carbon (BOD material) in raw water added on the day, so the concentration of nitrogen in the treated water can be maintained at a much lower concentration than before. .
이렇게 함으로 종래기술(특허 공보번호 94-6403호)이 갖고 있는 구조적 단점을 보완하며 회분식 운전방식(SBR : Sequencing Batch Reactor)에 의한 질소 제거방식의 장점을 살린 것이 본 발명의 특징이다.In this way, it is a feature of the present invention that supplements the structural disadvantages of the prior art (Patent Publication No. 94-6403) and takes advantage of the nitrogen removal method by a sequencing batch reactor (SBR).
또, 본 발명에서는 예를 들어 1일 4싸이클 운전을 할 경우 4시간 블로우어를 가동(포기)후 2시간 교반하므로 블로우어는 4시간 가동후 2시간 휴식하고 다시 4시간 가동후 2시간 휴식하며 교반기는 반대로 2시간 가동후 4시간 휴식하게 되어 블로우어와 교반기의 무리가 적어 기계적인 고장요인이 적어지는 장점이 있다.In addition, in the present invention, for example, when operating four cycles per day, the blower is stirred for 2 hours after the operation (aeration) for 4 hours, so the blower is rested for 2 hours after the operation for 4 hours and again for 2 hours after the operation for 4 hours. On the contrary, after 2 hours of operation, there is a break of 4 hours, so there is less blower and agitator, and there is less mechanical failure factor.
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