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양돈폐수의 영양염류(질소)제거에서 C/N비가 처리효율에 미치는 영향
윤조희 경남대학교 환경문제연구소 1997 환경연구 Vol.20 No.-
A biological treatment system using anaerobic-anoxic-oxic(A₂/O_ processes with a plugflow pattern under oxic conditions was employed for treatment of piggery wastewater including high-strength TN nitrogen. This system was named plug flow reactor(PFR) Operation of the system was performed on a lab-scale reactor in the range of 0.2 kg/㎥/d to 1.0 kg/㎥/d TOC loading rate with 32 hours total hydraulic rention time (A₂/O=8/8/16) at temerature of 22±1℃ during all experiment periods. Average removal efficiencies for TOC and TN in this system were 83.5% and 78.1%, respectively. High loading rates and high ration of nitrogento organic carbon were appeared not to be oxided to nitrate nitrongen and to cause nitrite nitrogen accumulation despite of operating 16hours HRT in oxic process for nitrification. Rates of nitrification and denitrification in the system were in the range of 0.055~0.107 gNH₄-N/gMLSS/d 0.063 ~ 0.120 gNO_(x)-N/gMLSS/d. respectively.
물질수지를 이용한 A<sub>2</sub>O 고정생물막법에서의 호기탈질평가
윤조희,박승환,이상훈,김승현,Yoon, Cho-Hee,Park, Seung-Hwan,Lee, Sang-Hoon,Kim, Seung-Hyun 대한환경공학회 2000 대한환경공학회지 Vol.22 No.2
본 연구는 $A_2O$ 공정을 적용한 고정생물막법을 이용하여 고농도의 총무기성질소(TIN) 유입으로 인해 C/N비가 낮은 폐수를 처리하기 위하여 최적의 운전조건 탐색과 생물학적 호기탈질을 평가하였다. 혐기조와 무산소조에 세라믹 여재를 그리고 호기조에 PVC 여재를 충전한 실험장치는 C/N(TOC/TIN)비를 0.5로 일정하게 유지하고 알칼리도를 변화시켜 실험을 실시하였으며 그 결과는 다음과 같다. 유기물제거는 운전조건에 관계없이 96.0% 이상의 높은 제거효율을 얻었다. 유입수의 알칼리도를 약 1210mg/L(Run 5)로 운전하였을 때, $NH_4{^+}-N$와 총 질소 평균 제거효율은 각각 93.5%, 81.8%이었으며, 제거된 총 질소 중 64.9%가 호기조에서 생물학적 탈질에 의해서 제거되었다. 호기조에서 물질수지를 이용하여 질소와 알칼리도를 분석한 결과, 1mg의 $NO_2{^-}-N$가 탈질에 의해 제거될 때 2.49~3.46mg의 알칼리도가 생성되었다. 호기조에서의 생물학적 탈질은 ${\Delta}TOC/{\Delta}DEN$의 이론적인 비 1.22보다 낮은 0.84(Run 5)에서 일어났다. This study was investigated to estimate optimal conditions and biological oxic denitrification to treat wastewater with low C/N ratio and high strength total inorganic nitrogen (TIN) concentration by using $A_2O$ fixed biofilm system. The lab-scale experimental system packed with media, which were composed of polyvinylidene chloride fiber (oxic basin) and ceramic ball (anaerobic and anoxic basin), was used. This system was operated with various influent alkalinities at the C/N(TOC/TIN) ratio of 0.5. The study results showed that TOC were removed over 96.0% at all operation conditions. The removal efficiencies over 93.5% for $NH_4{^+}-N$ and 81.8% for TIN were obtained at the alkalinity of about 1210mg/L(Run 5). Among the removal of TIN, 64.9% was occurred by biological denitrification at an oxic basin. It was confirmed through mass balance of alkalinity and nitrogen that the amount of alkalinity produced during biological denitrification at oxic basin was 2.49~3.46 mg Alkalinity/mg $NO_2{^-}-N$, ${\Delta}TOC/{\Delta}DEN$ of 0.34 (Run 5) was obtained at an oxic basin, which was less than the theoretical value of 1.22.
촉매습식산화공정에 의한 p - nitrophenol 의 분해반응
윤조희,조성호 한국공업화학회 1999 응용화학 Vol.3 No.1
Catalytic wet oxidation using an oxygen as oxidant of aqueous solutions of substituted phenol(p-nitrophenol) was studied into completely mixed batch reactor. The experiments have been performed with various parameters such as temperature, amount of catalyst and pH, etc with an oxygen partial pressure of 0.297MPa. A proprietary catalyst containing supported manganese and cerium oxides was found to be effective for decomposition of p-nitrophenol. And it has also been found that COD and TOC removal efficincies measured showed the maximum results at the ratio 2.64 of gram p-nitrophenol to gram manganese.
혐기 / 무산소 / 호기공법을 이용한 양돈폐수처리에 있어 폭기조의 흐름특성이 유기물 및 질소제거에 미치는 영향
윤조희,김용석 ( Cho Hee Yoon,Yong Suk Kim ) 한국물환경학회 1996 한국물환경학회지 Vol.12 No.4
This study was performed to investigate and evaluate the treatabilities and the behavior characteristics of organics and nitrogen in two-type swine wastewater treatment systems using anaerobic-anoxic-oxic (A₂/O) process. Two-type systems were distinguished by flow pattern in oxic process. One was named plug flow reactor(PFR) and another was named completely mixed flow reactor(CMFR). These systems were applied to a laboratory scale reactor in the range 0.2∼1.0 ㎏TOC/㎥/d with a temperature of 22±1℃. And a total of 32 hours hydraulic retention time(HRT) including 8/8/16 hours of anaerobic/anoxic/oxic zones was used to simulate the swine wastewater treatment plants with an average 4,000㎎/L MISS with the external/internal recycle of 100/300 percentage ratios for all experiment. The two systems behaved almost identically for TOC removal efficiency, but a few difference in the TN removal efficiency was observed. Average removal efficiencies for TOC in their two systems were 83.5% and 82.2%, and for TN 78.1% and 75.7%, respectively. High nitrogen loading rates and high ratios of nitrogen and organics were appeared not to be oxided to nitrate nitrogen(NO₃-N) and to cause nitrite nitrogen(NO₂-N) accumulation despite of operating l6 hours HRT for nitrification under oxic process.