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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, 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, 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.
류병곤(Ryu, Byung-Gon),류은영(Ryu, Eun-Young) 경기연구원 2013 GRI 연구논총 Vol.15 No.3
The aim of this thesis is to find the influence of transformational/transactional leadership on organizational commitment and moderating effects of organizational culture. To carry out the purposes of this study, the data were collected from 592 employees in Seoul and Gyeong-gi area of public, public enterprise, bank, services, information technology(IT), manufacturing, electrical, construction, retail, clothing, metal, research centers, etc total of 38 companies. The conclusions of this study can be summarized as following: First, transformational leadership has stronger effect on organizational commitment than transactional leadership. Second, adhocracy culture is positive moderating effects between transformational leadership and organizational commitment. Third, clan culture is positive moderating effects between transformational leadership and organizational commitment. Fourth, hierarchy culture is positive moderating effects between transformational leadership and organizational commitment and negative moderating effects between transactional leadership and organizational commitment.