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Ryu, Byung-Gon,Kim, Jungmin,Han, Jong-In,Kim, Kyochan,Kim, Donghyun,Seo, Bum-Kyoung,Kang, Chang-Min,Yang, Ji-Won Elsevier 2018 Algal research Vol.31 No.-
<P><B>Abstract</B></P> <P>This study investigated the feasibility of employing an electro-flotation-oxidation process that employs a pair of boron-doped diamond (BDD) and aluminum (Al) electrodes for electrochemical harvesting of green microalgae (<I>Scenedesmus quadricauda</I>) and treatment of residual pollutants in coke effluent, following an algal-bacterial process. Electro-coagulation-flotation with polarity exchange and with direct electro-flotation at 15mAcm<SUP>−2</SUP> or more for 40min allowed almost complete harvesting of microalgae. Similar harvesting efficiencies were achieved using direct electro-flotation, without electro-coagulation, under different electrical densities because algal biomass formed flocs with the other microorganisms in the activated sludge (AS). These results also indicate that the proposed approach of inducing bioaggregation <I>via</I> floc-forming microorganisms with microalgae is an efficient alternative to chemical flocculation, because it can minimize the release of toxic metal coagulants during electrochemical harvesting. During sequential electro-oxidation, anodic oxidation using the BDD electrode simultaneously mineralized residual soluble chemical oxygen demand (SCOD) and thiocyanate (SCN<SUP>−</SUP>), which are not degraded by algal-bacterial mixed cultures. Although the degradation rate of SCN<SUP>−</SUP> was much higher than that of SCOD under certain current densities, further investigation is needed to clarify the mechanism of SCN<SUP>−</SUP> mineralization during BDD-anodic oxidation. To satisfy the standard level of electrical power consumption for wastewater treatment, an electric current density below 15mAcm<SUP>−2</SUP> must be supplied. The proposed electrochemical approach involving bioflocculation could be used as an efficient post treatment of microalgae-mediated process for treating coke wastewater.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Al-BDD electrode was used for harvest of alga and treatment of residual pollutant. </LI> <LI> The bio-flocculated alga was harvested by electro-flotation without Al coagulation. </LI> <LI> The SCOD and SCN<SUP>−</SUP> were simultaneously degraded by anodic oxidation using BDD anode. </LI> </UL> </P>
Ryu, Byung-Gon,Kim, Jungmin,Han, Jong-In,Yang, Ji-Won Elsevier 2017 Bioresource technology Vol.225 No.-
<P><B>Abstract</B></P> <P>This study examined the feasibility of using an algal-bacterial process for removal of phenol and NH<SUB>4</SUB> <SUP>+</SUP>-N from differently diluted coke wastewater with simultaneous production of biomass. Under illumination, microalgal-bacterial (MSB) cultures performed complete phenol degradation at all dilutions of coke wastewater while sole microalgal culture (MSA) degraded a maximum of 27.3% of phenol (initial concentration: 24.0mgL<SUP>−1</SUP>) from 5-fold diluted wastewater. Furthermore, the MSB culture had the highest rate of NH<SUB>4</SUB> <SUP>+</SUP>-N removal (8.3mgL<SUP>−1</SUP> d<SUP>−1</SUP>) and fatty acid production (20mgL<SUP>−1</SUP> d<SUP>−1</SUP>) which were 2.3- and 1.5-fold higher than those observed in the MSA cultures, probably due to decreases in toxic organic pollutants. Multivariate analyses indicated that co-cultivation of activated sludge was directly correlated with the elevated removals of phenol and NH<SUB>4</SUB> <SUP>+</SUP>-N. In the presence of sludge, adequate dilution of the coke wastewater can maximize the effect of bacteria on NH<SUB>4</SUB> <SUP>+</SUP>-N removal and biomass production.</P> <P><B>Highlights</B></P> <P> <UL> <LI> The feasibility of microalgal-based treatment of coke wastewater was evaluated. </LI> <LI> Activated sludge was mainly responsible for the degradation of phenol and COD. </LI> <LI> Greater fatty acid accumulation occurred with greater dilutions of coke wastewater. </LI> <LI> RDA-NMDS clarified the effects of wastewater dilution and activated sludge. </LI> </UL> </P>
Ryu, Byung-Gon,Kim, Eun Jung,Kim, Hee-Sik,Kim, Jungmin,Choi, Yoon-E,Yang, Ji-Won 한국생물공학회 2014 Biotechnology and Bioprocess Engineering Vol.19 No.2
This study examined the use of Chlorella vulgaris for the simultaneous bioremediation of municipal wastewater and production of biodiesel. We tested the effect of wastewater dilution on C. vulgaris growth in filtered and sterilized wastewater, sterilized wastewater, and untreated wastewater. Growth was the greatest in untreated wastewater, suggesting that certain wastewater components, such as bacteria, may promote microalgal growth. We confirmed the presence of beneficial bacteria by denaturing gradient gel electrophoresis analysis and inoculation of wastewater bacteria into microalgal cultures in artificial medium. Furthermore, we employed a semi-continuous cultivation process that successfully combined the advantages of indigenous bacteria with a high level of inoculum. Finally, cells grown in wastewater contained high levels of useful fatty acids. Collectively, our data suggest that it may be feasible to use wastewater-grown C. vulgaris biomass for simultaneous bioremediation and biodiesel production.
서번트 리더십이 감성지능에 따라 조직 시민행동에 미치는 영향에 관한 연구
류병곤 ( Byung Gon Ryu ),조영락 ( Young Rak Cho ) 한국인력개발학회 2007 HRD연구 Vol.9 No.1
본 연구에서는 서번트 리더십이 조직시민행동에 미치는 영향과 그 영향관계에 감성지능이 미치는 조절효과를 알아보고자 하였다. 서번트 리더십과 조직시민행동은 하위 구성 차원들을 하나의 변수로 고려하였지만, 감성지능은 4개의 구성 차원인 감성 인식, 감성 표현, 감성 조절, 감성 활용으로 나누어 각각의 조절효과를 분석하였다. 분석에 사용된 자료는 122명의 응답자를 대상으로 하였으며, 분석결과 서번트 리더십은 조직시민행동에 긍정적인 영향을 미치는 것으로 나타났으며, 감성지능의 조절효과는 부분적으로 나타났다. 즉 감성지능의 하위 차원 중에서 감성 인식과 감성 활용은 제외하고 감성 표현과 감성 조절만이 서번트 리더십과 조직시민행동과의 관계에 조절효과를 미치는 것으로 나타났다. 본 연구가 주는 의미는 서번트 리더십이 조직성과를 제고하는데 중요한 역할을 할 수 있다는 것이며, 아울러 리더가 종업원 개인에 대한 배려와 조력자로서 역할을 충실히 수행한다 하여도 종업원 개인의 감성에 대한 인식이 부족할 때는 이러한 리더십의 효과가 줄어들 수 있다는 것이다. 아울러 본 연구는 서번트 리더십이라는 신조류의 리더십이론을 종업원 개개인의 감성지능에 따라 조직시민행동에 미치는 영향을 검증한 것으로 의미가 있다고 할 것이다. This study is intended to understand the influence of servant leadership on organizational citizenship behavior and moderating effect of emotional intelligence on that relationship. To analyze moderating effect of emotional intelligence, four sub-dimensions of which are separately considered: emotional awareness, emotional presentation, emotional adjustment, emotional utilization. Data were collected from 122 respondents. Result shows that servant leadership is positively related to organizational citizenship behavior and moderating effect of emotional intelligence is partially accepted, that is, emotional presentation and emotional adjustment have moderating effect on the relation between servant leadership and organizational citizenship behavior but emotional awareness and emotional utilization show no moderating effect. Result of this study implies that servant leadership plays an important role in enhancing organizational performance and such a role might be diminished if leader could not recognize employees` individual emotional intelligence. This study also contribute to theory building in new leadership area by empirically testing an effect of servant leadership on organizational citizenship behavior with emotional intelligence.