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Bioresource Technology

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https://www.readbyqxmd.com/read/27919545/the-effects-of-pre-aeration-and-inoculation-on-solid-state-anaerobic-digestion-of-rice-straw
#1
Ying Zhou, Chao Li, Ivo Achu Nges, Jing Liu
Pre-aeration was investigated for enhancing biodegradation of recalcitrant lignocellulosic structure of rice straw under various low temperatures regimes (25, 35 and 45°C) and aeration durations (0, 2, 4, 6 and 8days). It was demonstrated aerated rice straw for 2days at 35°C resulted in highest hydrolytic efficiency and biochemical methane potential (BMP) (355.3±18.7mlCH4/gVS). Furthermore, both methane yields and initiation speeds of the solid-state anaerobic digestion (SS-AD) were inversely proportional to substrate-to-inoculum ratios due to the accumulation of volatile fatty acids (VFAs) and poor mass transfer...
November 29, 2016: Bioresource Technology
https://www.readbyqxmd.com/read/27919544/dual-effect-of-soluble-materials-in-pretreated-lignocellulose-on-simultaneous-saccharification-and-co-fermentation-process-for-the-bioethanol-production
#2
Lei Qin, Xia Li, Li Liu, Jia-Qing Zhu, Qi-Man Guan, Man-Tong Zhang, Wen-Chao Li, Bing-Zhi Li, Ying-Jin Yuan
In this study, wash liquors isolated from ethylenediamine and dry dilute acid pretreated corn stover were used to evaluate the effect of soluble materials in pretreated biomass on simultaneous saccharification and co-fermentation (SSCF) for ethanol production, respectively. Both of the wash liquors had different impacts on enzymatic hydrolysis and fermentation. Enzymatic conversions of glucan and xylan monotonically decreased as wash liquor concentration increased. Whereas, with low wash liquor concentrations, xylose consumption rate, cell viability and ethanol yield were maximally stimulated in fermentation without nutrient supplementary...
November 29, 2016: Bioresource Technology
https://www.readbyqxmd.com/read/27916499/quantitative-impact-of-influent-characteristics-on-nitrogen-removal-via-anammox-and-denitrification-in-a-landfill-bioreactor-case
#3
Xiaoyuan Wang, Bing Xie, Chaoqun Zhang, Yiwen Shen, Jun Lu
In this paper, Quantitative Polymerase Chain Reaction (qPCR), Illumina MiSeq sequencing and (15)N stable isotopic tracing methods were applied to study the effects of influent organic loading, BOD5/TN and NO2-N/NH4-N ratios on the combined nitrogen removal through denitrification and anammox. The results show that, the total nitrogen removal was above 90% at the optimum reaction condition: organic loading 0.04kg/m(3)·day, BOD5/TN 0.2, and NO2-N/NH4-N 1.0. Approximately 9.43% of the nitrogen removal occurred through anammox process when BOD5/TN was 0...
November 27, 2016: Bioresource Technology
https://www.readbyqxmd.com/read/27916500/achieving-ethanol-type-fermentation-for-hydrogen-production-in-a-granular-sludge-system-by-aeration
#4
Song Zhang, Min Liu, Ying Chen, Yu-Ting Pan
To investigate the effects of aeration on hydrogen-producing granular system, experiments were performed in two laboratory-scale anaerobic internal circulation hydrogen production (AICHP) reactors. The preliminary experiment of Reactor 1 showed that direct aeration was beneficial to enhancing hydrogen production. After the direct aeration was implied in Reactor 2, hydrogen production rate (HPR) and hydrogen content were increased by 100% and 60%, respectively. In addition, mixed-acid fermentation was transformed into typical ethanol-type fermentation (ETF)...
November 25, 2016: Bioresource Technology
https://www.readbyqxmd.com/read/27916498/bioremediation-mechanisms-of-combined-pollution-of-pahs-and-heavy-metals-by-bacteria-and-fungi-a-mini-review
#5
REVIEW
Shao-Heng Liu, Guang-Ming Zeng, Qiu-Ya Niu, Yang Liu, Lu Zhou, Lu-Hua Jiang, Xiao-Fei Tan, Piao Xu, Chen Zhang, Min Cheng
In recent years, knowledge in regard to bioremediation of combined pollution of polycyclic aromatic hydrocarbons (PAHs) and heavy metals by bacteria and fungi has been widely developed. This paper reviews the species of bacteria and fungi which can tackle with various types of PAHs and heavy metals entering into environment simultaneously or successively. Microbial activity, pollutants bioavailability and environmental factors (e.g. pH, temperature, low molecular weight organic acids and humic acids) can all affect the bioremediation of PAHs and heavy metals...
November 25, 2016: Bioresource Technology
https://www.readbyqxmd.com/read/27914786/evaluating-the-feasibility-of-ratio-control-strategy-for-achieving-partial-nitritation-in-a-continuous-floccular-sludge-reactor-experimental-demonstration
#6
Wenru Liu, Dianhai Yang
To investigate the applicability of ratio control strategy to other systems, a continuous floccular sludge reactor was used in this study. It was found that nitrite accumulation was barely detected throughout 70days' investigation, being the average concentration in the effluent of 0.7±0.4mg/L. Batch experiments indicated that low dissolved oxygen (DO<0.3mg·L(-1)) greatly repressed the ammonium oxidizing bacteria (AOB) but only slightly inhibited the nitrite oxidizing bacteria (NOB). However, high-throughput sequencing revealed that the ratio of abundance between Nitrospira and Nitrosomonas, being the dominant NOB and AOB respectively, was considerably low (1...
November 25, 2016: Bioresource Technology
https://www.readbyqxmd.com/read/27914785/effect-of-macroporous-adsorption-resin-membrane-bioreactor-hybrid-system-against-fouling-for-municipal-wastewater-treatment
#7
Weiwei Chen, Jing Luo, Ruyi Cao, Yuting Li, Jinrong Liu
Membrane bioreactor (MBR) displays significant advantages in effluent quality, sludge production, footprint, and operation. However, membrane fouling limits the application of MBR. This study investigated membrane fouling in a macroporous adsorption resin-membrane bioreactor hybrid system established by adding macroporous adsorption resin (MAR) into MBR. MAR addition increased the critical flux by 27.97%, indicating that membrane fouling was successfully mitigated. Consequently, comparative experiments were designed to analyze the pathway...
November 25, 2016: Bioresource Technology
https://www.readbyqxmd.com/read/27913172/efficient-catalytic-system-for-the-direct-transformation-of-lignocellulosic-biomass-to-furfural-and-5-hydroxymethylfurfural
#8
Luxin Zhang, Guoyun Xi, Jiaxin Zhang, Hongbing Yu, Xiaochang Wang
A feasible approach was developed for the co-production of 5-hydroxymethylfurfural (5-HMF) and furfural from corncob via a new porous polytriphenylamine-SO3H (SPTPA) solid acid catalyst in lactone solvents. XRD, SEM, XPS, N2 adsorption-desorption, elemental analysis, TG-DTA, acid-base titration and FTIR spectroscopy techniques were used to characterize the catalyst. This study demonstrates and optimizes the catalytic performance of SPTPA and solvent selection. SPTPA was found to exhibit superior catalytic ability in γ-valerolactone (GVL)...
November 25, 2016: Bioresource Technology
https://www.readbyqxmd.com/read/27913169/liquid-nitrogen-pretreatment-of-eucalyptus-sawdust-and-rice-hull-for-enhanced-enzymatic-saccharification
#9
Rafael Castoldi, Vanesa G Correa, Gutierrez Rodrigues de Morais, Cristina G M de Souza, Adelar Bracht, Rosely A Peralta, Regina F Peralta-Muniz Moreira, Rosane M Peralta
In this work, liquid nitrogen was used for the first time in the pretreatment of plant biomasses for purposes of enzymatic saccharification. After treatment (cryocrushing), the initial rates of the enzymatic hydrolysis of eucalyptus sawdust and rice hull were increased more than ten-fold. Cryocrushing did not modify significantly the contents of cellulose, hemicellulose and lignin in both eucalyptus sawdust and rice hulls. However, substantial disorganization of the lignocellulosic materials in consequence of the pretreatment could be observed by electron microscopy...
November 25, 2016: Bioresource Technology
https://www.readbyqxmd.com/read/27914782/co-metabolism-of-substrates-by-bacillus-thuringiensis-regulates-polyhydroxyalkanoate-co-polymer-composition
#10
Subhasree Ray, Vipin Chandra Kalia
Polyhydroxyalkanoate (PHA) production by Bacillus thuringiensis EGU45 was studied by co-metabolism of crude glycerol (CG) (1%, v/v), glucose (0.05-0.5%, w/v) and propionic acid (0.05-0.5%, v/v) under batch (shake flask) culture conditions. Glycerol+PA combination resulted in 15-100mg/L PHA co-polymers with a HV content of 33-81mol%. The addition of NH4Cl (0.5%, w/v) to CG+PA enhanced PHA production by 1.55-fold, with a HV content of 58-70mol%. The time period of incubation of PA to the feed: CG+glucose was optimized to be 3h after initiation of fermentation...
November 23, 2016: Bioresource Technology
https://www.readbyqxmd.com/read/27912182/influence-of-the-gas-liquid-flow-configuration-in-the-absorption-column-on-photosynthetic-biogas-upgrading-in-algal-bacterial-photobioreactors
#11
Alma Toledo-Cervantes, Cindy Madrid-Chirinos, Sara Cantera, Raquel Lebrero, Raúl Muñoz
The potential of an algal-bacterial system consisting of a high rate algal pond (HRAP) interconnected to an absorption column (AC) via recirculation of the cultivation broth for the upgrading of biogas and digestate was investigated. The influence of the gas-liquid flow configuration in the AC on the photosynthetic biogas upgrading process was assessed. AC operation in a co-current configuration enabled to maintain a biomass productivity of 15gm(-2)d(-1), while during counter-current operation biomass productivity decreased to 8...
November 23, 2016: Bioresource Technology
https://www.readbyqxmd.com/read/27898317/ammonia-tolerant-inocula-provide-a-good-base-for-anaerobic-digestion-of-microalgae-in-third-generation-biogas-process
#12
Ahmed Mahdy, Ioannis A Fotidis, Enrico Mancini, Mercedes Ballesteros, Cristina González-Fernández, Irini Angelidaki
This study investigated the ability of an ammonia-acclimatized inoculum to digest efficiently protein-rich microalgae for continuous 3rd generation biogas production. Moreover, we investigated whether increased C/N ratio could alleviate ammonia toxicity. The biochemical methane potential (BMP) of five different algae (Chlorella vulgaris)/manure (cattle) mixtures showed that the mixture of 80/20 (on VS basis) resulted in the highest BMP value (431mLCH4 gVS(-1)), while the BMP of microalgae alone (100/0) was 415mLCH4 gVS(-1)...
November 23, 2016: Bioresource Technology
https://www.readbyqxmd.com/read/27913170/effects-of-the-feeding-ratio-of-food-waste-on-fed-batch-aerobic-composting-and-its-microbial-community
#13
Xiaojun Wang, Songqing Pan, Zhaoji Zhang, Xiangyu Lin, Yuzhen Zhang, Shaohua Chen
To determine the suitable feeding ratio for fed-batch aerobic composting, four fermenters were operated by adding 0%, 5%, 10% or 15% of food waste every day. The results showed that the 5% and 10% treatments were able to maintain continuous thermophilic conditions, while the 15% treatment performed badly in regard to composting temperature, which was probably due to the negative effects of excessive moisture on microbial activity. As composting proceeded, both the 5% and the 10% treatments reached maturity and achieved weight losses of approximately 65%...
November 22, 2016: Bioresource Technology
https://www.readbyqxmd.com/read/27908585/innovative-pretreatment-strategies-for-biogas-production
#14
REVIEW
Regina J Patinvoh, Osagie A Osadolor, Konstantinos Chandolias, Ilona Sárvári Horváth, Mohammad J Taherzadeh
Biogas or biomethane is traditionally produced via anaerobic digestion, or recently by thermochemical or a combination of thermochemical and biological processes via syngas (CO and H2) fermentation. However, many of the feedstocks have recalcitrant structure and are difficult to digest (e.g., lignocelluloses or keratins), or they have toxic compounds (such as fruit flavors or high ammonia content), or not digestible at all (e.g., plastics). To overcome these challenges, innovative strategies for enhanced and economically favorable biogas production were proposed in this review...
November 22, 2016: Bioresource Technology
https://www.readbyqxmd.com/read/27907871/fluorescent-probe-based-subcellular-distribution-of-cu-ii-ions-in-living-electrotrophs-isolated-from-cu-ii-reduced-biocathodes-of-microbial-fuel-cells
#15
Ye Tao, Hua Xue, Liping Huang, Peng Zhou, Wei Yang, Xie Quan, Jinxiu Yuan
Based on the four indigenous electrotrophs (Stenotrophomonas maltophilia JY1, Citrobacter sp. JY3, Pseudomonas aeruginosa JY5 and Stenotrophomonas sp. JY6) isolated from well adapted Cu(II)-reduced biocathodes of microbial fuel cells (MFCs), a rhodamine based Cu(II) fluorescent probe was used to imaginably and quantitatively track subcellular Cu(II) ions in these electrotrophs. Cathodic electrons led to more Cu(II) ions (14.3-30.1%) in the intracellular sites at operation time of 2-3h with Cu(II) removal rates of 2...
November 22, 2016: Bioresource Technology
https://www.readbyqxmd.com/read/27898321/anaerobic-batch-conversion-of-pine-wood-torrefaction-condensate
#16
Tharaka Rama Krishna C Doddapaneni, Ramasamy Praveenkumar, Henrik Tolvanen, Marja R T Palmroth, Jukka Konttinen, Jukka Rintala
Organic compound rich torrefaction condensate, owing to their high water content and acidic nature, have yet to be exploited for practical application. In this study, microbial conversion of torrefaction condensate from pine wood through anaerobic batch digestion (AD) to produce methane was evaluated. Torrefaction condensate exhibited high methane potentials in the range of 430-492mL/g volatile solids (VS) and 430-460mL/gVS under mesophilic and thermophilic conditions, respectively. Owing to the changes in the composition, the methane yields differed with the torrefaction condensates produced at different temperatures (225, 275 and 300°C), with a maximum of 492±18mL/gVS with the condensate produced at 300°C under mesophilic condition...
November 22, 2016: Bioresource Technology
https://www.readbyqxmd.com/read/27898320/catalytic-pyrolysis-of-natural-algae-over-mg-al-layered-double-oxides-zsm-5-mgal-ldo-zsm-5-for-producing-bio-oil-with-low-nitrogen-content
#17
Lijing Gao, Jiahui Sun, Wei Xu, Guomin Xiao
Cyanobacteria were catalytically pyrolyzed over Mg-Al layered double oxide/ZSM-5 composites (MgAl-LDO/ZSM-5) to produce bio-oil. MgAl-LDO/ZSM-5 with a Mg/Al molar ratio of four was proved to be the best catalyst. Under the optima condition that the final temperature was 823K, heating rate was 10K/min and catalyst/algae mass ratio was 0.75, a maximum yield of liquid (41.1%) was achieved at 823K with a heating rate of 10K/min and a catalyst/algae mass ratio of 0.75, which was much higher than the one obtained without catalyst...
November 22, 2016: Bioresource Technology
https://www.readbyqxmd.com/read/27898319/assessing-the-usefulness-of-clostridia-spores-for-evaluating-sewage-sludge-hygienization
#18
Julia Martín-Díaz, Maria Ruiz-Hernando, Sergi Astals, Francisco Lucena
The capability of clostridia spores to act as pathogen indicators in sewage sludge treatment was investigated. Sulfite-reducing clostridia and E. coli levels were monitored during waste activated sludge pre-treatments (alkali and ultrasound) and its subsequent mesophilic anaerobic digestion. E. coli was maintained or reduced depending on treatment type and intensity. However, alkali pre-treatment (35.3gNaOH/kgTS) by itself and alkali (157gNaOH/kgTS) and ultrasound (27,000kJ/kgTS) pre-treatments followed by anaerobic digestion provoked reproducible clostridia increases...
November 22, 2016: Bioresource Technology
https://www.readbyqxmd.com/read/27898318/understanding-the-performance-of-microbial-community-induced-by-zno-nanoparticles-in-enhanced-biological-phosphorus-removal-system-and-its-recoverability
#19
Zhetai Hu, Xuanyu Lu, Peide Sun, Zhirong Hu, Ruyi Wang, Chengke Lou, Jingyi Han
In this study, the impacts of ZnO Nanoparticles (NPs) on the microbial community in enhanced biological phosphorus removal (EBPR) system and its recoverability were investigated. High-throughput sequencing was applied to study the microbial community shift. Results show that the species richness in the EBPR system was reduced under the condition of ZnO NPs with high concentration (above 6mg/L). Evolution analysis suggests that higher concentration ZnO NPs induced more microbial community shift. According to the analysis on genus level, Competibacter was more impressionable than Accumulibacter after exposure to 2mg/L ZnO NPs...
November 22, 2016: Bioresource Technology
https://www.readbyqxmd.com/read/27898316/effects-of-iron-and-calcium-carbonate-on-the-variation-and-cycling-of-carbon-source-in-integrated-wastewater-treatments
#20
Zhao Zhimiao, Song Xinshan, Zhao Yufeng, Xiao Yanping, Wang Yuhui, Wang Junfeng, Yan Denghua
Iron and calcium carbonate were added in wastewater treatments as the adjusting agents to improve the contaminant removal performance and regulate the variation of carbon source in integrated treatments. At different temperatures, the addition of the adjusting agents obviously improved the nitrogen and phosphorous removals. TN and TP removals were respectively increased by 29.41% and 23.83% in AC-100 treatment under 1-day HRT. Carbon source from dead algae was supplied as green microbial carbon source and Fe(2+) was supplied as carbon source surrogate...
November 22, 2016: Bioresource Technology
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