통계적 기법을 이용한 동시 탈질 및 질산화공정의 진단

김한래 ( Han Lae Kim ),장순웅 ( Soon Woong Chang ),이시진 ( Si Jin Lee ) 한국물환경학회 2008 한국물환경학회·대한상하수도학회 공동 춘계학술발표회 Vol.2008 No.-

습식산화법을 이용한 제강분진 내 아연회수를 위한 최적조건 도출에 관한 연구(Part I; 침출공정)

문대헌,안상우,김한래,김지태,장순웅,Moon, Dea-Hyun,Ahn, Sang-Woo,Kim, Han-lae,Kim, Ji-Tae,Chang, Soon-Woong 한국자원리싸이클링학회 2015 資源 리싸이클링 Vol.24 No.3

EAFD (Electric Arc Furnace Dust) is considered as pernicious pollutant, assigned hazardous waste. Since this dust is a by-product of industry, it contains valuable metals such as Fe, Zn, Ni, Cu which can be turned into resources by recycling process. In this study, hydrometallurgical process was applied to recover Zn from Electric Arc Furnace Dusts. The result showed 95% Zn recovery at 3M $H_2SO_4$, Solids/Liquid ratio 1:2 and aeration of 1.8L/min for 2hr. However there was 80% Zn recovery at lower $H_2SO_4$ concentration apply for pilot scale plant. 제강분진(Electric Arc Furnace Dusts)은 유해폐기물로 지정되어있는 유해한 환경오염물질이다. 이 분진은 철강산업의 부산물로써 철, 아연, 니켈, 구리 등 많은 유가금속을 포함하고 있어 적절한 처리를 거치면 폐기물이 아닌 자원으로 재활용이 가능하다. 본 연구에서는 국내 전기로에서 발생하는 제강분진을 대상으로 가장 높은 함유량을 가진 아연의 회수를 위한 최적조건을 도출하기 위해 습식침출법을 적용하였다. 분진과 황산의 고액비, 침출시간, $MnO_2$ 투입량 등의 조건을 종합하여 실험을 진행하여 최적 아연회수조건을 도출하였다. 황산농도 3 M, 고액비 1:2, 철 제거를 위한 폭기 1.8 L/min 강도로 2시간에서 95%의 아연 회수율이 관찰되었다. 그러나, 현장 적용의 현실성을 고려한 다른 최적의 조건은 저농도 황산과 $MnO_2$ 3.5 g을 투입했을 경우 약 80 %의 아연 회수율을 나타내었다.

광학을 이용한 SV₃₀ 자동측정장치개발 및 신뢰도 평가 연구

정우진 ( Woo Jin Chung ),홍성민 ( Seong Min Hong ),김한래 ( Han Lae Kim ),장순웅 ( Soon Woong Chang ) 한국폐기물자원순환학회(구 한국폐기물학회) 2016 한국폐기물자원순환학회지 Vol.33 No.4

Solid-liquid separation is important for securing safe runoff quality in the biological treatment process. In particular, the method for determining sludge settlement characteristics using SVI, which is a parameter, evaluates the precipitation features of sludge in an aeration tank and secondary precipitation tank and is a simple and widely used method. However, in methods using SVI, the accumulation of objective data is usually not possible, since the subjective judgment of operators is mainly involved in this evaluation method. Therefore, the automation of SVI measurement is required to improve the determination method of sludge settlement using SVI. In this study, an automatic measurement system of SVI using optics was developed. To evaluate the reliability of the measurement system, a visual inspection test was performed in parallel with our suggested SV30 auto-measurement system using actual sludge and a similar tendency in the results was obtained. Using this suggested SV30 automation system, the indirect determination of MLSS (Mixed-Liquor-Suspended-Solids) activation states of the aeration tank and precipitation tank is also expected to be possible. Through the test results, it was verified that the reliability of SVI determination was increased by identifying the effect of outside light after performing a test under external light interference.

연구논문 : 활성슬러지 반응탱크의 풍량제어지표인 NADH에 관한 연구

정우진 ( Woo Jin Chung ),홍성민 ( Sung Min Hong ),김한래 ( Han Lae Kim ),장순웅 ( Soon Woong Chang ) 한국환경과학회 2016 한국환경과학회지 Vol.25 No.3

Domestic sewerage treatment plant is operated by activated sludge method and its modified method by using microorganism. In most cases, a method of using microorganism is directly controlled by the operator based on individual judgment through factors of DO, pH and ORP. In addition, under aerobic condition in bioreactor, energy consumption including excessive air injection is learned to be somewhat plenty. In order to solve this problem, in most of the process, improvement of internal recycling and activated environmental factor of microorganism were researched extensively. However, as factors are changed depending on various conditions, it is not sufficient as an indicator of judgment. As such, a research on operation of bioreactor that measures metabolic change in short time by directly measuring activated condition of microorganism using NADH fluorometer is required in reality.It is considered that the method like this could supplement problem of energy consumption being occurred in the existing treatment method and operational optimization of bioreactor would be enabled by controlling optimal air volume. Therefore, in this study, in order to obtain optimal operational indicator of bioreactor, proper air volume control test was performed and through batch test and site evaluation, possibility of NADH sensor being utilized as operational control indicator of bioreactor is intended to be analyzed. In order to compare with measured value, DO, ORP that are operational control indicator of existing bioreactor were used. As MLSS concentration was increased through batch test, NADH value was increased and site evaluation also showed similar tendency to batch test. Resultantly, it could be confirmed that changing level of NADH fluorometer was a sensor that could measure bioreactor condition effectively and optimized scale of bioreactor is considered to be utilized.

전자빔 공정에서 실험계획법을 이용한 살균제 Benomyl의 제거특성 및 독성평가

유승호(Seung Ho Yu),조일형(Il Hyoung Cho),장순웅(Soon Woong Chang),이시진(Si Jin Lee),천석영(Suk Young Chun),김한래(Han Lae Kim) 大韓環境工學會 2008 대한환경공학회지 Vol.30 No.9

본 연구는 전자빔 공정에서 실험계획법(design of experiment: DOE) 중 일반요인배치법(general factorial design)을 이용하여 2개 인자(X1: benomyl concentration(mg/L), X2: E-beam irradiation(Gy))를 토대로 요인(X1: benomyl concentration) 1에서 3개 수준(3 level: 0.5, 1 및 1.5 mg/L)와 요인(X2: E-beam irradiation) 2에서 6개 수준(6 level: 100, 800, 600, 400, 200 및 100 Gy)으로 구성된 3블록(block) 실험조합에 따라 Benomyl의 분해(Y1: the % of decomposition), 무기화(Y2: the % of materialization) 및 독성평가(acute toxicity assessment)를 수행하였다. 우선 HPCL 분석에 의한 Benomyl에 분해특성은 처리조합(treatment combination) 3 블록(block)의 17 및 18번을 제외한 모든 실험조건에서 100% 분해되었고 등분산(equal variance) 조건에서 일원분산분석(one-way ANOVA)결과 수준 간 유의한 차이가 없었다(p>0.05). 전자빔 조사에 의한 Benomyl에 무기화(materialization) 특성은 각 3개의 처리조합에서 평균 46%, 36.7% 및 22%의 제거효율을 나타났고 각 조합에서 처리수준 간 예측식은 block 1(Y1=0.024X1+34.1(R2=0.929)), block 2(Y2=0.026X2+23.1(R2=0.976)) 및 block 3(Y3=0.034X³⁺6.2(R2=0.98)) 등의 1차 선형 회귀식을 만족하였다. 또한 Benomyl에 무기화(materialization)에 대한 Anderson-Darling 검정을 이용한 정규성(normality)을 만족하였다(p>0.05). 또한 무기화에 대한 반응에 대한 선형 및 비선형을 포함한 다중회귀분석(multi regression analysis)을 도출한 결과 다음과 같은 예측식 Y=39.96-9.36X1+0.03X2-10.67X1 2-0.001X2 2+0.011X1X2(R2=96.3%, Adjusted R2=94.8%)을 도출하였다. 2가지 반응변수(X1: benomyl concentration(mg/L), X2: E-beam irradiation(Gy))에 의한 2차 반응표면 모형식 추정으로부터 정준분석을 통해 최적조건을 도출한 결과 Benomyl 초기농도(X1) 0.55 mg/L, 전자빔 조사량 950 Gy에서 TOC 제거율 57.3%으로 나타났다. 마지막으로 V. fischeri를 이용한 Microtox(TM) modified 81.9% test을 이용하여 전자빔에 의한 Benomyl에 대한 급성 독성을 평가한 결과 전자빔 조사전 block 1의 0.5 mg/L에서 10.25%, block 2의 1 mg/L에서 20.14% 및 block 3의 1.5 mg/L에서 26.2%의 생물학적 방해(inhibition)작용이 발생하였으나 전자빔 조사 후 모든 조건에서 생물학적 방해영향을 나타나지 않았다. We investigated and estimated at the characteristics of decomposition and mineralization of benomyl using a design of experiment(DOE) based on the general factorial design in an E-beam process, and also the main factors(variables) with benomyl concentration(X1) and E-beam irradiation(X2) which consisted of 5 levels in each factor was set up to estimate the prediction model and the optimization conditions. At frist, the benomyl in all treatment combinations except 17 and 18 trials was almost degraded and the difference in the decomposition of benomyl in the 3 blocks was not significant(p>0.05, one-way ANOVA). However, the % of benomyl mineralization was 46%(block 1), 36.7%(block 2) and 22%(block 3) and showed the significant difference of the % that between each block(p<0.05). The linear regression equations of benomyl mineralization in each block were also estimated as followed; block 1(Y1=0.024X1+34.1(R2=0.929)), block 2(Y2=0.026X2+23.1(R2=0.976)) and block 3(Y3=0.034X³⁺6.2(R2=0.98)). The normality of benomyl mineralization obtained from Anderson-Darling test in all treatment conditions was satisfied(p>0.05). The results of prediction model and optimization point using the canonical analysis in order to obtain the optimal operation conditions were Y=39.96-9.36X1+0.03X2-10.67X1 2-0.001X2 2+0.011X1X2(R2=96.3%, Adjusted R2=94.8%) and 57.3% at 0.55 mg/L and 950 Gy, respectively. A Microtox test using V. fischeri showed that the toxicity, expressed as the inhibition(%), was reduced almost completely after an E-beam irradiation, whereas the inhibition(%) for 0.5 mg/L, 1 mg/L and 1.5 mg/L was 10.25%, 20.14% and 26.2% in the initial reactions in the absence of an E-beam illumination.