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Rene, Eldon R,Bernat, Przemyslaw,Dlugo?ski, Jerzy,Veiga, Maria C,Kennes, Christian Humana Press 2012 Applied biochemistry and biotechnology Vol.168 No.6
<P>Biodegradation of styrene by Exophiala sp. was tested at different initial concentrations (19.3-170.6 mgl(-1)), pH (2.8-8.7), and temperatures (19.8-45.1 C), for 120 h according to a 2(3) full-factorial central composite design. The specific growth rate (SGR, per hour) and specific styrene utilization rate (SUR, milligrams of styrene per milligram of biomass per hour) values were used as the response variables for optimization purposes. The interactions between concentration and temperature (P=0.022), and pH and temperature (P=0.010) for SGR, and interactions between concentration and temperature (P=0.012) for SUR were found to be statistically significant. The optimal values for achieving high SGR (0.15 h(-1)) and SUR (0.3622 mg styrene mg(-1) biomass h(-1)) were calculated from the regression model equation. Those values are C(o)=89.1 mgl(-1), pH=5.4, and T=31.5 C for SGR and C(o)=69.2 mgl(-1), pH=5.5, and T=32.4 C for SUR. It was also observed that the Exophiala strain degrades styrene via phenylacetic acid, involving initial oxidation of the vinyl side chain. Besides, in the presence of styrene, changes in the fatty acids profile were also observed. It is hypothesized that an increasing amount of linoleic acid (18:2) may be involved in the protection of the fungus against toxic substrate.</P>
Samayita Chakraborty,Eldon R. Rene,Piet N. L. Lens 한국미생물학회 2019 The journal of microbiology Vol.57 No.9
The simultaneous removal of phenol and selenite from synthetic wastewater was investigated by adopting two different co-culturing techniques using the fungus Phanerochaete chrysosporium and the bacterium Delftia lacustris. Separately grown biomass of the fungus and the bacterium (suspended co-culture) was incubated with different concentrations of phenol (0–1,200 mg/L) and selenite (10 mg/L). The selenite ions were biologically reduced to extracellular Se(0) nanoparticles (3.58 nm diameter) with the simultaneous degradation of up to 800 mg/L of phenol. Upon growing the fungus and the bacterium together using an attached growth co-culture, the bacterium grew as a biofilm onto the fungus. The extracellularly produced Se(0) in the attached growth co-culture had a minimum diameter of 58.5 nm. This co-culture was able to degrade completely 50 mg/L phenol, but was completely inhibited at a phenol concentration of 200 mg/L.
Huynh Le Man,Eldon R. Rene,시셔,박흥석 대한토목학회 2011 KSCE JOURNAL OF CIVIL ENGINEERING Vol.15 No.6
In the city of Ulsan, South Korea, Food-Waste Leachate (FWL) is let off into the ocean, which eventually poses a severe threat to the marine environment. Preliminary results suggest that this leachate, when subjected to an optimized fermentation process can generate ethanol. A 2^3-factorial design was employed, and the effects of temperature (30-40oC), pH (4-6), and reducing sugar concentration (RSC, 45-75 g L^(−1)) on ethanol yield was investigated through controlled batch experiments using Saccharomyces cerevisiae (KCTC-7904), a species of budding yeast. A maximum yield of 0.31 g ethanol g^(−1) RSC corresponding to an ethanol concentration of 23.56 g L^(−1) was achieved under the following test conditions: temperature - 40oC, pH - 4.0, and RSC - 75 g L^(−1). Among the different parameters studied, both temperature and RSC had a strong synergistic effect on ethanol yield, while the effects due to changes in pH values were minimal. Anew, under the test conditions, the 2-way interaction effect between temperature × pH and the 3-way interaction between temperature × pH × RSC were negative, while all other interactions, were positive and also found to be statistically significant at 5% probability (p value < 0.05). The results were represented by a suitable model equation, which could be easily applied for scale-up to produce value-added ethanol, by sterilizing FWL prior to fermentation. The practical implications of this research have been stated.
Rehman, Aafaq ur,Baek, Jin Woong,Rene, Eldon R.,Sergienko, Natalia,Behera, Shishir Kumar,Park, Hung-Suck Elsevier 2018 Process safety and environmental protection Vol.118 No.-
<P><B>Abstract</B></P> <P>Climate change issues and acid rain episodes have triggered new research directions and the conceptualization of new preventive approaches to reduce toxic gases from entering the environment. The reduction of carbon dioxide (CO<SUB>2</SUB>) levels in the indoor environment are also one of the challenging human safety issues during emergency incidents and rescues; for instance, a building fire. The use of an activated carbon fiber (ACF) based mask is not only effective to filter CO<SUB>2</SUB> but it is also practically easy to use during such demanding situations. Such modified adsorbents will have high adsorption volume, fast adsorption rates and good thermal, acid and alkaline resistance properties. For the emergency mode considering fires, the major task is atmospheric recovery. Thus, CO<SUB>2</SUB> concentration in the post-fire smoke could be high. The smoke in the room causes suffocations and unconsciousness leading to fatal injuries. In this study, ACF was modified using copper nitrate trihydrate [Cu (NO<SUB>3</SUB>)<SUB>2</SUB> <SUP>.</SUP>3H<SUB>2</SUB>O] by impregnation and carbonization (450°C), followed by its characterization. The modified ACF (Cu-ACF-12) showed large surface area (1147m<SUP>2</SUP> g<SUP>−1</SUP>), high micropore volume (0.45cm<SUP>3</SUP> g<SUP>−1</SUP>) and an average pore size of 1.57nm. CO<SUB>2</SUB> removal tests were carried out in a lab scale fixed bed adsorption column using the modified ACF. The process parameters were optimized based on a Box-Behnken Design (BBD) and tested in the following ranges: gas flow rate – 150–250mlmin<SUP>−1</SUP>, moisture content – 0–40% and modification of the ACF impregnated with copper (Cu) – 4–12wt.%. The experimental results were statistically interpreted to elucidate the main and interaction effects. The modification of ACF showed positive effects on CO<SUB>2</SUB> removal, while gas flow rate and moisture content decreased the CO<SUB>2</SUB> removal. Under the optimal conditions, (gas flow rate – 150mlmin<SUP>−1</SUP>, moisture content – 0% and modification of the ACF – 8%), CO<SUB>2</SUB> removal capacity of 2.31mmol of CO<SUB>2</SUB> g<SUP>−1</SUP> Cu-ACF was obtained.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Modified activated carbon fiber (ACF) for CO<SUB>2</SUB> removal. </LI> <LI> Fixed bed adsorption column using modified ACF for process parameters optimization. </LI> <LI> Optimum CO<SUB>2</SUB> removal capacity of 2.31mmol of CO<SUB>2</SUB> g<SUP>−1</SUP> Cu-ACF at gas flow rate: 150mlmin<SUP>−1</SUP>, moisture content: 0% and modification of the ACF: 8%. </LI> <LI> Close agreement between the predicted and observed CO<SUB>2</SUB> removal capacity. </LI> </UL> </P>
Arijit Dutta Gupta,Balendu Shekher Giri,Eldon R Rene,Preeti Chaturvedi,Mandavi Goswami,Harinder Singh 대한환경공학회 2021 Environmental Engineering Research Vol.26 No.6
As(III) presence in low concentration (1-5 mg/L) in water presents a challenging problem in its removal. In the present study, biochar prepared by the pyrolysis of mustard cake and loaded with Fe-Mn binary oxides through hydrothermal technique was used for adsorptive removal of As(III) from water in batch and continuous modes. The synthesised biochar exhibited mesoporous structures in the range of 2-50 nm (based on BET analysis). The maximum adsorption capacity (95.7 mg/g) obtained using biochar loaded with both Fe-Mn oxides was found to be 1.4 times higher than that of pristine biochar. The adsorption equilibria was best described by Freundlich isotherm (based on R² and χ²) suggesting that the As(III) adsorption was multilayered. The external mass transfer coefficients (βL = 10<SUP>-5</SUP> cm²/s) were observed to be higher than the film (Df = 10<SUP>-7</SUP> – 10<SUP>-9</SUP> cm²/s) and intraparticle (Di = 10<SUP>-9</SUP> cm²/s) diffusivities in batch mode. In column studies, Thomas model gave the best correlation coefficient (R² > 0.95) and the adsorption was limited by external mass transfer. Kinetic rate constant decreased with increase in initial As(III) concentration and flow rate. The oxide loaded biochar exhibited reusability up to three times for As(III) removal.
Arijit Dutta Gupta,Balendu Shekher Giri,Eldon R Rene,Preeti Chaturvedi,Mandavi Goswami,Harinder Singh 대한환경공학회 2021 Environmental Engineering Research Vol.26 No.6
As(III) presence in low concentration (1–5 mg/L) in water presents a challenging problem in its removal. In the present study, biochar prepared by the pyrolysis of mustard cake and loaded with Fe-Mn binary oxides through hydrothermal technique was used for adsorptive removal of As(III) from water in batch and continuous modes. The synthesised biochar exhibited mesoporous structures in the range of 2–50 nm (based on BET analysis). The maximum adsorption capacity (95.7 mg/g) obtained using biochar loaded with both Fe-Mn oxides was found to be 1.4 times higher than that of pristine biochar. The adsorption equilibria was best described by Freundlich isotherm (based on R2 and χ2) suggesting that the As(III) adsorption was multilayered. The external mass transfer coefficients (βL = 10−5 cm2/s) were observed to be higher than the film (Df = 10−7 – 10−9 cm2/s) and intraparticle (Di = 10−9 cm2/s) diffusivities in batch mode. In column studies, Thomas model gave the best correlation coefficient (R2 > 0.95) and the adsorption was limited by external mass transfer. Kinetic rate constant decreased with increase in initial As(III) concentration and flow rate. The oxide loaded biochar exhibited reusability up to three times for As(III) removal.