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Your search keyword '"Wang, Xiaofen"' showing total 31 results
Start Over Author "Wang, Xiaofen" Journal bioresource technology
31 results on '"Wang, Xiaofen"'

23. Bioconversion of un-pretreated lignocellulosic materials by a microbial consortium XDC-2

Author

Guo Peng, Cui Zongjun, Wang Hui, Lu Yucai, Wang Xiaofen, Mochidzuki Kazuhiro, and Li Jiajia

Subjects
Time Factors, Environmental Engineering, Bioconversion, Microbial Consortia, Biomass, Lignocellulosic biomass, Bioengineering, Lignin, Gas Chromatography-Mass Spectrometry, chemistry.chemical_compound, Hemicellulose, Food science, Cellulose, Waste Management and Disposal, Waste Products, Principal Component Analysis, Endo-1,4-beta Xylanases, Bacteria, Denaturing Gradient Gel Electrophoresis, Renewable Energy, Sustainability and the Environment, food and beverages, General Medicine, Hydrogen-Ion Concentration, Microbial consortium, Straw, Solutions, Biodegradation, Environmental, chemistry, Agronomy, Xylanase, Volatilization, Extracellular Space, Biotechnology
Abstract

The present study investigated the degradation of un-pretreated wheat straw, corn stalk, and rice straw by a lignocellulose-degrading microbial consortium XDC-2. Following six days of cultivation, exocellular xylanase activities were 414.9, 491.9, and 335 U/mL, respectively. After 12 days, the rice straw had lost 39.71% of its weight, hemicellulose and cellulose losses of 78.27% and 14.08%, respectively. The total amount of volatile products reached a maximum on day six for rice straw degradation. The four major types of volatile products were acetic acid, propionic acid, butanoic acid, and glycerin, all of which would be suitable substrates for conversion to methanol by anaerobic digestion. According to PCR-DGGE analysis, XDC-2 remained stable during the degradation process of untreated lignocellulosic biomass. These results demonstrate the potential for further development and application of XDC-2; it is capable of degrading un-pretreated lignocellulosic materials, and has a low cost of operation.

Published
2013

30. Effects of adding EDTA and Fe 2+ on the performance of reactor and microbial community structure in two simulated phases of anaerobic digestion.

Author

Cai Y, Hu K, Zheng Z, Zhang Y, Guo S, Zhao X, Cui Z, and Wang X

Subjects
Anaerobiosis, Biological Availability, Bioreactors, Sulfates, Edetic Acid pharmacology, Iron pharmacology, Microbiota drug effects
Abstract

The uptake of trace elements can be impeded by precipitation in the presence of carbonates and sulfates. The objective of this study was to investigate whether ethylenediaminetetraacetic acid (EDTA) enhances the performance of anaerobic digestion by forming dissolved complexes with Fe 2+ . Batch experiments were performed in this study and acidogenic and methanogenic phases were artificially simulated. EDTA was added to both of phases to examine its effects on Fe bioavailability, metabolic parameters and microbial community structure. The results showed that EDTA significantly accelerated the digestion process in both phases because its addition changed the Fe sorption law and increased Fe-bioavailability. The microbial community structure changed following by the change of Fe-fractions which was determined by EDTA. This study demonstrated that EDTA as ligand could increase the Fe-bioavailability and then reduced or replaced the addition of Fe., (Copyright © 2018 Elsevier Ltd. All rights reserved.)

Published
2019
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31. Bioreactor performance and methanogenic population dynamics in a low-temperature (5-18 °C) anaerobic fixed-bed reactor.

Author

Zhang D, Zhu W, Tang C, Suo Y, Gao L, Yuan X, Wang X, and Cui Z

Subjects
Anaerobiosis physiology, Bacteria, Anaerobic classification, Bacteria, Anaerobic metabolism, Cold Temperature, Equipment Design, Equipment Failure Analysis, Species Specificity, Batch Cell Culture Techniques instrumentation, Bioreactors microbiology, Euryarchaeota classification, Euryarchaeota metabolism, Methane metabolism
Abstract

The effect of temperature on the functionality of microbial community structure in a low temperature, anaerobic fixed-bed reactor was studied by decreasing the operating temperature from 18 °C to 5 °C. The reactor was productive within 20 days and produced stable methane content in biogas (above 77%) throughout the trial period. At 17 °C and 15 °C, chemical oxygen demand (COD) removal efficiency and biogas production of reactor were significantly reduced. These might be temperature thresholds when fixed-bed reactors are operated under low temperatures. The methanogen community composition was analyzed using 16S rRNA gene clone library screening and quantitative PCR. At low ambient temperatures, Methanomicrobiales were dominant methanogens, and they preferentially adhered to the carbon fiber carrier. The results indicated that 16S rRNA levels of Methanomicrobiales and Methanosaetaceae in adhering sludge were higher than in deposited sludge, and they all contributed to the efficient performance of the fixed-bed reactor at low operating temperatures., (Crown Copyright © 2011. Published by Elsevier Ltd. All rights reserved.)

Published
2012
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