연구논문 : 마이크로-나노버블 반응조를 이용한 미생물성장 동력학 계수의 추정에 관한 연구

한영립 ( Young Rip Han ),정병길 ( Byung Gil Jung ),정유진 ( Yoo Jin Jung ),조도현 ( Do Hyun Cho ),성낙창 ( Nak Chang Sung ) 한국환경과학회 2010 한국환경과학회지 Vol.19 No.5

Development of the refuse derived fuel (RDF) from sewage sludge by using microwave-thermal hybrid drying process

Han Seok Kim,Kyung Choul Park,Young Rip Han,Young Ik Choi,Byung Gil Jung 한국폐기물자원순환학회 2011 한국폐기물자원순환학회 학술대회 Vol.2011 No.1

Development of the refuse derived fuel (RDF) from sewage sludge by using microwave-thermal hybrid drying process

( Han Seok Kim ),( Kyung Choul Park ),( Young Rip Han ),( Young Ik Choi ),( Byung Gil Jung ) 한국폐기물자원순환학회(구 한국폐기물학회) 2011 한국폐기물자원순환학회 추계학술발표논문집 Vol.2011 No.-

염색폐수의 생물학적 처리효율 향상을 위한 마이크로-나노버블 오존산화 장치의 적용에 관한 연구

한영립 ( Young-rip Han ),이기형 ( Ki-hyung Lee ),정진희 ( Jin-hee Jung ),강동효 ( Dong-hyo Kang ),최영익 ( Young-ik Choi ) 한국환경기술학회 2011 한국환경기술학회지 Vol.12 No.2

본 연구는 기존 오존산화(conventional bubbles ozonation; CB-OZ) 시스템의 단점인 낮은 오존용해효율 및 처리효율을 증가시키기 위한 방안으로 마이크로-나노버블 오존산화(micro-nanobubbles ozonation; MNB-OZ) 시스템을 이용한 오존 용해특성을 살펴보고, 또한 염색폐수 처리수의 공업용수 재이용을 위한 처리특성 및 생물학적 전처리로서 염색폐수의 생분해 특성 등을 평가하는데 그 목적이 있다. 본 연구에 사용된 염색폐수는 B시 소재 염색폐수처리장에 유입되는 원수와 최종처리수를 대상으로 하였으며, 실험장치는 마이크로-나노버블 발생장치와 오존발생장치로 구성된 유효용량 400L의 MNB-OZ 시스템을 사용하였으며, 또한 비교실험을 위해 같은 용량의 CB-OZ 시스템을 사용하였다. 실험결과 MNB-OZ 시스템을 이용하여 0.5 ㎛ 이하의 미세기포를 발생시켜 물질전달속도가 크게 향상됨에 따라 오존의 접촉효율이 증대되고 오존의 높은 용해도를 기대할 수 있어 경제적인 효과도 클 것으로 예상되었다. MNB-OZ 시스템을 이용한 염색폐수 처리수의 오존산화 실험을 통해 공업용수의 재이용기준인pH 6.5∼8.5, SS 10 mg/L 이하, BOD 6 mg/L 이하, 탁도 10 NTU 이하, 대장균군수 1,000 이하를 모두 만족하여 공업용수로서의 재이용 가능성을 엿볼 수 있었다. 또한 염색폐수 원수의 MNB-OZ 시스템 적용결과 생분해도의 지표인 BOD₅/COD_Cr 비가 초기 0.32에서 0.48로 증가하여 생물학적 처리를 위해 적당한 값인 0.4 이상의 값을 만족하여 MNB-OZ 시스템을 통해 생분해도의 향상을 가져왔으며, 기타 TOC, SS, 색도, 탁도 UV₂₅₄등의 제거효율이 각각 15.6%, 74.7%, 70.7%, 63.0%, 32.6%로 조사되어 난분해성 유기물, 유해 유기화합물 등을 다량 함유한 고농도 염색폐수의 오염부하량을 전처리 단계에서 저감시켜 생물학적 처리시설에 도입함으로서 고농도폐수의 안정적이고 효율적인 처리가 가능할 것으로 사료된다. The main objectives of this research are to investigate characteristics of ozone solubility due to low solubility of traditional ozone generators, evaluate the treatment characteristics of reclaiming textile wastewater for industrial water, and analyze characteristics of biodegradable of the textile wastewater for biological pre-treatment by means of micro-nano bubbles ozonation(MNB-OZ) system. The textile wastewater used in this research was obtained from influent and final effluent of the textile wastewater in B city in South Korea. There is a 400 L reactor which consists of a micro-nano bubble system and a ozone generator for this experiments. As a result of generating micro-nano bubbles by using of the MNB-OZ system, the size of micro-bubbles was shown to be below 0.5 ㎛. It improved ozone solubility due to higher ozone transfer rates. Consequently, the shorter ozonation time clearly indicates the lower power costs. The reported results clearly indicated that the MNB-OZ system can be effectively and inexpensively. Results of the experiments through the MNB-OZ system in this study satisfy all reclaiming standards as industrial water: pH 6.5~8.5, SS 10 mg/L or below, BOD5 6 mg/L or below, turbidity 10 NTU or below, Coliforms 1,000/100 mL or below. Therefore, there is a possibility of the reclaiming of the textile wastewater as industrial water. Moreover, an index of biodegradable, that is BOD₅/COD_Cr (reasonable ratio value; 4.0), increased from 0.32 to 0.48. when influent textile wastewater was applied by the MNB-OZ system. Removal efficiencies for TOC, SS, color, turbidity and UV₂₅₄ were 15.6%, 74.7%, 70.7%, 63.0% and 32.6% respectively. Influent textile wastewater contains persistent organic pollutants and harmful organic compounds that were ozonated and assessed of biodegradability. By doing this, treatment of recalcitrant influent textile wastewater could be feasible with the employed MNB-OZ system effectively and safely.

하수처리수의 재이용을 위한 정밀여과-역삼투막 2단 여과공정 적용시 투과성능 평가

한영립 ( Young-rip Han ),정병길 ( Byung-gil Jung ) 한국환경기술학회 2012 한국환경기술학회지 Vol.13 No.2

본 연구는 정밀여과-역삼투막(MF-RO) 2단 여과공정을 이용한 하수처리수(2차침전지 유출수, 모래여과지 유출수)의 막여과시 투과수량, 역세척 방법 및 투과유속 등의 변화에 따른 막오염 및 처리수의 특성 등 공정별 최적 운전조건 도출 및 공업용수로의 재이용 방안을 평가하고자 하였다. 실험결과 하수처리장 2차침전지 유출수(E-1) 및 사여과지 유출수(E-2)의 막여과(MF-RO)공정적용시 동일 운전조건(1회 여과주기(30 min 운전/1 min 역세정))에서 각각 평균 15.2L/cycle·module 및 20.3 L/cycle·module으로, 2차침전지에서 사여과 공정까지 거친 최종방류수를 이용한 재이용 방안이 더 효과적인 것으로 나타났다. 또한 Run 3 운전조건(운전압력 20 psi, 설계 Flux 256.4 LMH)에서 여과주기 당 평균 23.5 L/cycle·module의 여과수량과 회복율 98%이상을 유지하여 가장 안정적 조건으로 나타났다. 정밀여과-역삼투막(MF-RO) 2단 여과공정을 이용한 하수처리수의 생산수질은 하천유지용수, 공업용수, 농업용수 등 모든 기준치를 만족하여 지역특성에 맞는 선택적인 하수처리수의 재이용이 가능할 것으로 판단된다. The objectives of this research are to investigate permeate, flux variations and backwashing methods according to characteristics of pretreatment of the wastewater by means of two stage microfiltration-reverse osmosis(MF-RO) membranes for both effluent wastewater(E-1) and effluent of sand filtration(E-2) and to evaluate the reclamation of wastewater for industrial water. The results show that averages of permeate with the two stage microfiltration-reverse osmosis(MF-RO) membranes for wastewater(E-1) and effluent of sand filtration(E-2) are 15.2 L/cycle·module and 20.3 L/cycle·module when a same operation condition(30 min operation and 1 min backwashing). Consequently, the results presented in this paper show that treating with the two stage microfiltrationreverse osmosis(MF-RO) membranes for effluent of sand filtration(E-2) is a better method. Moreover, the operation conditions for Run 3 (operation pressure: 20 psi and design flux: 256.4 LMH) are the most stable conditions which provided that average permeate is 23.5 L/cycle·module and recovery efficiency is 98%. It is possible to provide river maintenance water, industrial water and agricultural water with reclamation of wastewater treated with the two stage microfiltration-reverse osmosis(MF-RO) membranes.

마이크로-나노버블 및 일반버블 산기장치 시스템의 산소전달효율 비교 연구

한영립 ( Young Rip Han ),최영익 ( Young Ik Choi ),윤태경 ( Tae Kyung Yoon ),이강춘 ( Gang Choon Lee ),정병길 ( Byung Gil Jung ) 한국수처리학회 2011 한국수처리학회지 Vol.19 No.5

The main objective of this study was to evaluate the comparative analysis of oxygen transfer efficiencies between MNB(Micro-nano bubble) and CB(conventional bubble) diffuser systems for application of wastewater treatment processes such as flotation, aeration, water reclamation and so on. The bubble size of the MNB diffuser system was shown to be below 0.5 ㎛, and a proper air flowrate was 1.0 L/min. When the proposed MNB system compared with the CB diffuser system, the overall oxygen transfer coefficient (KLa), standard oxygen transfer rate (N) and volumetric oxygen transfer rate (VOTR) values were 11.67 (13.18), 11.80 (13.08) and 3.23 (13.14) times higher for influent (effluent) dyeing wastewater in the same initial conditions at air flow rate (1.0 L/min) under standard conditions (20℃, 1 atm), respectively. Therefore, the MNB diffuser system is expected to be much better effective technology on water and wastewater treatment processes.

ORIGINAL ARTICLE : A Study on the Improvement of Membrane Separation and Optimal Coagulation by Using Effluent of Sewage Treatment Plant in Busan

( Jin Hee Jung ),( Young Ik Choi ),( Young Rip Han ) 한국환경과학회 2013 한국환경과학회지 Vol.22 No.10

The objectives of this paper are the characterization of the pretreatment of wastewater by microfiltration (MF) membranes for river maintenance and water recycling. This is done by investigation of the proper coagulation conditions, such as the types and doses of coagulants, mixing conditions (velocity gradients and mixing periods), pH, etc., using jar tests. The effluent water from a pore control fiber (PCF) filter located after the secondary clarifier at Kang-byeon Sewage Treatment Plant (K-STP) was used in these experiments. Two established coagulants, aluminum sulfate (Alum) and poly aluminum chloride (PAC), which are commonly used in sewage treatment plants to treat drinking water, were used in this research. The results indicate that the optimal coagulation velocity gradients (G) and agitation period (T) for both Alum and PAC were 200-250 s-1 and 5 min respectively, but the coagulation efficiencies for both Alum and PAC were lower at low values of G and T. For a 60 min filtration period on the MF, the flux efficiencies (J/J0 (%)) at the K-STP effluent that were coagulated by PAC and Alum were 92.9 % and 79.9 %, respectively, under the same coagulation conditions. It is concluded that an enhanced membrane process is possible by effective filtration of effluent at the K-STP using the coagulation-membrane separation process.

음식물류 폐기물의 최적건조공정 개발을 위한 마이크로파 및 열풍 공정의 건조효율에 관한 연구

정병길 ( Byung-gil Jung ),한영립 ( Young-rip Han ),최영익 ( Young-ik Choi ) 한국환경기술학회 2013 한국환경기술학회지 Vol.14 No.2

본 연구는 마이크로파 및 열풍 건조장치를 이용하여 음식물류 폐기물의 재활용 측면에서 음식물류 폐기물의 운전조건별(마이크로파 단독, 열풍단독, 마이크로파-열풍 융합(200 또는 250℃) 건조특성을 평가하고자 하는데 그 목적이 있다. 연구에 사용된 음식물류 폐기물은 B시 P사에서 채취하여 사용하였으며, 음식물류 폐기물과 가연성 물질의 균질 혼합 및 건조효율 향상을 위하여 비닐, 어패류 등 이물질을 제거하였다. 마이크로파 건조장치의 전체 크기는 W 1,360 mm × L 1,060 mm × H 900 mm, 마이크로파 건조장치의 조사강도는 1 kW이며, 마이크로파 주파수는 2,450 MHz, 건조온도는 최대 300℃로 제작하였다. 음식물류 폐기물 건조실험을 실시한 결과 마이크로파-열풍(250℃) 건조를 이용한 완전건조(함수율 10% 이하)시 최종 함수율 변화는 운전시간 15분에서 7.1%로 나타났다. 실험결과 음식물류폐기물의 재활용 방안으로 열풍 융합건조공정을 이용한 고형연료의 생산이 충분히 가능할 것으로 판단된다. The main objectives of this study are to develope a drying method for recycling food waste and to evaluate drying properties of food waste with different operating conditions(microwave, thermal air and microwave-thermal air(200 or 250℃) by means of using the microwave and thermal air drying process. The food waste used in this research was collected at P Company located in B City. For homogeneous mixture of food waste with combustible materials and for better drying efficiency, foreign substances which were vinyl, fish and shellfish were removed. The size of the microwave-thermal air drying unit is 1,360 mm(W) × 1,060 mm(L) × 900 mm(H), and its projection intensity and frequency were 1 kW and 2,450 MHz, respectively. Also, the microwave-thermal air drying unit was designed to control the highest drying temperature up to 300℃. As a best result of the experiment, the dried food waste using the microwave-thermal air (250℃) drying process led to the final moisture contents of 7.1% with 15 minutes operating period. In conclusions, as a way for recycling food waste, the microwave -thermal air drying process seems capable of producing refuse derived fuel(RDF).

Microwave drying RDF(Refused Derived Fuel) evaluation of sewage sludge by combined with waste activated carbon and waste oil

( Kwang Duk Park ),( Young Rip Han ),( Jong Chul Kim ),( Young Ik Choi ),( Byung Gil Jung ),( Jung Kwon Kim ) 한국폐기물자원순환학회(구 한국폐기물학회) 2011 한국폐기물자원순환학회 추계학술발표논문집 Vol.2011 No.-

연구논문 : SBR 및 MBR 공정을 이용한 분뇨폐수에서의 질소제거 특성

정진희 ( Jin Hee Jung ),윤영내 ( Young Nae Yoon ),이슬기 ( Seul Kee Lee ),한영립 ( Young Rip Han ),이승철 ( Seung Chul Lee ),최영익 ( Young Ik Choi ) 한국환경과학회 2015 한국환경과학회지 Vol.24 No.11

There are two treatment processes that are currently applied to ships are the biological treatment process using the activated sludge and the electrochemical treatment. However, neither of them are able to remove both nitrogen and phosphorus due to their limited ability to remove organic matters, which are main causes of the red tide. This study was conducted to identify the characteristics of nitrogen removal factors from manure wastewater by replacing the final settling tank in SBR (Sequencing Batch Reactor) process and applying immersion type hollow fiber membrane. SBR process is known to have an advantage of the least land requirement in special environment such as in ship and the immersion type hollow fiber membrane is more stable in water quality change. As the result, the average in the cases of DO (Dissolved Oxygen) is 2.9(0. 6∼3.9) mg/L which was determined to be the denitrifying microorganism activity in anaerobic conditions. The average in the cases of ORP (Oxidation Reduction Potential) is 98.4∼237.3 mV which was determined to be the termination of nitrification since the inflection point was formed on the ORP curve due to decrease in the stirring treatment after the aeration, same as in the cases of DO. Little or no variation in the pH was determined to have positive effect on the nitrification. T-N (Total Nitrigen) removal efficiencies of the finally treated water were 71.4%, 72.3% and 66.5% in relatively average figures, thus was not a distinct prominence. In being applied in ships in the future, the operating conditions and structure improvements are deemed necessary since the MEPC (Marine Environment Protection Committee). 227(64) ship sewage nitrogen is less than the standard of 20 Qi/Qe mg/L or the removal rate of 70%.