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제올라이트 BAF를 이용한 A<sup>2</sup>/O 공정의 질산화 및 질소처리 효율 향상 연구
최승규 ( Seung-kyu Choi ),주천 ( Zhu-qian ),김진수 ( Jin-su Kim ),이상일 ( Sang-ill Lee ) 한국수처리학회(구 한국수처리기술연구회) 2018 한국수처리학회지 Vol.26 No.3
Abstract : The study was conducted based on the A<sup>2</sup>/O process consisting of anaerobic / anoxic / oxic reaction tank. The removal rate of nitrogen was compared with that of the existing process by placing a zeolite - filled biological aerated filter (BAF) at the end of the process. A<sup>2</sup>/O was designed in three types. Type B increased the size of the oxic tank, and Type C placed the additional BAF. Zeolite has excellent adsorption ability of NH<sub>4</sub><sup>+</sup>-N, and this study has taken the advantage of that NH<sub>4 </sub><sup>+</sup>-N can be easily used by nitrifying microorganism. As a result, total nitrogen and NH<sub>4</sub><sup>+</sup>-N removal efficiency of A<sup>2</sup>/O-BAF were about 15% higher than other types. Also, A<sup>2</sup>/O-BAF showed superior treatment efficiency compared to other types even when the loading of NH<sub>4</sub><sup>+</sup>-N increased in the temperature range of 4.4 - 13.6℃. And the relationship between MLSS and operation efficiency was investigated in this study, but additional research is needed on this subject.
제올라이트 여재의 암모니아성 질소 이온교환 능력에 따른 ZBAF의 질산화 효율 비교
김진수 ( Jin-su Kim ),최승규 ( Seung-kyu Choi ),주천 ( Qian Zhu ),신관우 ( Gwan-woo Shin ),양창환 ( Chang-hwan Yang ),원경자 ( Kyoung-ja Weon ),이상일 ( Sang-ill Lee ) 한국수처리학회(구 한국수처리기술연구회) 2020 한국수처리학회지 Vol.28 No.2
This study was conducted to investigate nitrification by measuring the ammonia nitrogen adsorption ability of zeolite media. Zeolite adsorbs ammonia nitrogen through cation exchange. When zeolite is used as the filteration media in biological aerated filters (BAF), nitrifying bacteria can be easily attached. Using two types of zeolite that have different calcination temperatures, it was confirmed differences in nitrification rate relative to the ammonium ions exchange capacity of the zeolite media. The strength of the zeolite media was higher as calcination temperature was higher, while BET specific surface area was decreased. The ammonia nitrogen adsorption of the zeolite media at 600℃ was higher than at 900℃, but nitrification rates were similar when either media was used for the zeolite biological aerated filter (ZBAF). During the entire operation period, the 600℃ zeolite had an ammonia nitrogen removal rate of 0.31 kg/m<sup>3</sup>/d, and the 900℃ zeolite media had a rate of 0.28 kg/m<sup>3</sup>/d (p>0.05). When the influent was held on shutdown for a month and processing began again, the nitrification rate of the ZBAFs showed a similar amount of NO<sub>x</sub>-N (sum of the concentration of nitrite and nitrate nitrogen) production within two days of reoperation that was similar to the rate before shutdown. The effect of water temperature had little effect on rate. Ammonia nitrogen removal by ZBAFs was maintained in water temperatures as low as 5℃. However, the ammonia nitrogen removal and nitrification rate were decreased in 600℃ zeolite media after 3 months of operation because media’s morphology changed.
플라즈마 산화에서 pH 및 첨가제에 따른 페놀의 처리효율 비교
최승규 ( Seung-kyu Choi ),신관우 ( Gwan-woo Shin ),주천 ( Zhu-qian ),김진수 ( Jin-su Kim ),이상일 ( Sang-ill Lee ) 한국수처리학회(구 한국수처리기술연구회) 2019 한국수처리학회지 Vol.27 No.3
In this study, the treatment rate of phenol was compared by initial pH, magnesium source and activated carbon using underwater plasma process. When the initial pH were 4, 7, 10 and 12.5, phenol removal efficiency was the highest at pH 12.5. The larger amount of OH- used in the reaction, the formation of OH radical is better. Therefore, the phenol removal rate would have increased at high pH. MgO, MgSO<sub>4</sub>, Mg(OH)<sub>2</sub> were used as a magnesium sources and initial pH was 10. The removal efficiency of MgO and Mg(OH)<sub>2</sub> was higher than that of MgSO<sub>4</sub> and control. The magnesium ion itself has no effect on removal efficiency. It is considered that oxygen and OHattached to MgO and Mg(OH)<sub>2</sub> contributed to the increase of removal efficiency. The removal efficiency increased with the addition of GAC to the plasma process. Unlike the magnesium injecting, COD removal efficiency rate increased. It is considered that the activated carbon adsorbs phenol itself without decomposition into intermediates. injection of the additional materials to the plasma oxidation can increase the efficiency and overcome the limitations of the operating conditions.
Magnetite의 영향인자에 따른 크로뮴 이온의 제거 특성
이지영 ( Ji-young Lee ),김수진 ( Su-jin Kim ),김진수 ( Jin-su Kim ),최승규 ( Seong-kyu Choi ),주천 ( Qian Zhu ),심재훈 ( Jae-hoon Shim ),이상일 ( Sang-ill Lee ) 한국폐기물자원순환학회(구 한국폐기물학회) 2018 한국폐기물자원순환학회지 Vol.35 No.2
In this study, to evaluate the transboundary movement of magnetite waste, the treatment causing possible oxidation and reduction to the highly toxic Cr (VI), as well as other chromium ions must be considered. In this study, we tried to remove chromium using magnetite. The efficiency of chromium removal using magnetite, mixing time, mixing speed, and temperature was evaluated through a jar test. In case of magnetite, the total chromium and hexavalent chromium concentration were rapidly decreased to 0.7 g and 0.35 g, respectively. For mixing speed, the removal efficiency of total chromium was rapidly increased to 150 rpm, but that of hexavalent chromium was almost unchanged. For reaction time, the chromium concentration was almost identical. At 70℃, the removal efficiency of total and hexavalent chromium was 97.2% and 98.8%, respectively; therefore, application of magnetite to actual industrial sites where high-temperature industrial wastewater is generated can be considered.
투과증발 분리막을 이용한 불산 폐액 내 원료물질 회수를 위한 농축 시스템
임채성 ( Chae-sung Lim ),정윤영 ( Yoon-yong Jung ),이성수 ( Sung-soo Lee ),심재훈 ( Jea-hoon Shim ),최승규 ( Seung-kyu Choi ),주천 ( Qian Zhu ) 한국폐기물자원순환학회(구 한국폐기물학회) 2018 한국폐기물자원순환학회 춘계학술발표논문집 Vol.2018 No.-
반도체 산업에서 발생되는 고농도 폐액은 반도체 세정액으로 초고순도의 산용액을 사용하기 때문에 폐액이라고 하여도 일반 공업용 산용액에 비해 농도가 매우 높은 편에 속한다. 특히 반도체업계를 포함한 IT산업의 급속한 발달로 인하여 불산페액 발생량이 증가하는 추세를 보이고 있다. 규모에 따른 발생량을 추정해보면 국내 반도체 업계에서 연간 15,000ton의 불산폐액이 발생되고 LCD업계와 태양광산업에서 발생되는 불산폐액을 합산하면 국내 발생량은 약 50,000ton 정도로 예상된다. 또한 성장성과 경쟁력으로 볼 때 투자/매출 증가에 따른 폐액 발생 증가분을 예측해보면 향후 5년 내 현재 발생량의 약 2배에 이르게 될 전망이다. 발생된 불산 폐액은 일반적인 생물학적 처리가 불가능하며 현재 물리화학적 처리를 통해서 처리하고 있으나 재활용이 어렵고 2차폐기물이 발생하여 실용성이 떨어진다. 본 연구는 이러한 문제점을 해결하기 위해 반도체 업체에서 발생하는 불산폐액을 분리막을 이용한 투과증발 공정을 통해 수분을 분리하고 불산의 농도를 3배(약 20%, w/w)이상으로 농축을 가능케 하여 폐수 처리에 대한 부담을 줄였으며, 불산폐액에 포함된 이물질을 제거하기 위해 전처리로써 Activation Carbon과 제올라이트를 이용한 흡착법, Struvite 결정화 공법, 암모니아 stripping, 이온교환법을 이용하여 불산폐수 내 포함된 이물질의 제거를 꾀하였다.