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Chen Li-Jie,Xu Ya-Li,Bai Feng-Wu,Anderson William A.,Murray Moo-Young The Korean Society for Biotechnology and Bioengine 2005 Biotechnology and Bioprocess Engineering Vol.10 No.2
Using a general Saccharomyces cerevisiae as a model strain, continuous ethanol fermentation was carried out in a stirred tank bioreactor with a working volume of 1,500 mL. Three different gravity media containing glucose of 120, 200 and 280 g/L, respectively, supplemented with 5 g/L yeast extract and 3 g/L peptone, were fed into the fermentor at different dilution rates. Although complete steady states developed for low gravity medium containing 120 g/L glucose, quasi-steady states and oscillations of the fermented parameters, including residual glucose, ethanol and biomass were observed when high gravity medium containing 200 g/L glucose and very high gravity medium containing 280 g/L glucose were fed at the designated dilution rate of $0.027\;h^{-1}$. The observed quasi-steady states that incorporated these steady states, quasi-steady states and oscillations were proposed as these oscillations were of relatively short periods of time and their averages fluctuated up and down almost symmetrically. The continuous kinetic models that combined both the substrate and product inhibitions were developed and correlated for these observed quasi-steady states.
Faisal Javid,Xing Xin,William A. Anderson,José G.B. Derraik,Yvonne C. Anderson,Saeid Baroutian 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.115 No.-
This study used non-catalytic hydrothermal deconstruction to examine the deconstruction of a mixtureof numerous PPE items, including isolation gowns, gloves, goggles, face shields, surgical masks, andfiltering-facepiece respirators. A mixture of PPE items was subjected to hydrothermal deconstructionat temperatures varying between 250 C and 350 C and reaction times of 90 min and 180 min, respectively. A reduction of up to 95 % was attained in the total suspended solids (TSS). The total chemical oxygendemand (tCOD) and soluble chemical oxygen demand (sCOD) decreased dramatically to 703 mg/Land 480 mg/L, respectively. Volatile fatty acids, mainly acetic acid and ammonia nitrogen (NH3-N) werethe primary end products with a concentration of up to 15,625 mg/L and 38 mg/L after 180 min of deconstruction,respectively. Carbon dioxide and oxygen were found to be the primary gaseous product, with aconcentration of up to 14 % (w/w) for CO2 and 76 % (w/w) for O2. Further experiments were conducted at300 C and 350 C to reuse process water for five cycles to demonstrate the feasibility of process waterrecycling. The results propose that non-catalytic hydrothermal deconstruction may potentially reducePPE waste by minimising solid waste and water usage.