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https://www.readbyqxmd.com/read/28214733/flexible-camphor-diamond-like-carbon-coating-on-polyurethane-to-prevent-candida-albicans-biofilm-growth
#1
Thaisa B Santos, Angela A Vieira, Luciana O Paula, Everton D Santos, Polyana A Radi, Sônia Khouri, Homero S Maciel, Rodrigo S Pessoa, Lucia Vieira
Camphor was incorporated in diamond-like carbon (DLC) films to prevent the Candida albicans yeasts fouling on polyurethane substrates, which is a material commonly used for catheter manufacturing. The camphor:DLC and DLC film for this investigation was produced by plasma enhanced chemical vapor deposition (PECVD), using an apparatus based on the flash evaporation of organic liquid (hexane) containing diluted camphor for camphor:DLC and hexane/methane, mixture for DLC films. The film was deposited at a low temperature of less than 25°C...
February 16, 2017: Journal of the Mechanical Behavior of Biomedical Materials
https://www.readbyqxmd.com/read/28214701/leachate-flush-strategies-for-managing-volatile-fatty-acids-accumulation-in-leach-bed-reactors
#2
S Riggio, M Torrijos, G Vives, G Esposito, E D van Hullebusch, J P Steyer, R Escudié
In anaerobic leach-bed reactors (LBRs) co-digesting an easily- and a slowly-degradable substrate, the importance of the leachate flush both on extracting volatile fatty acids (VFAs) at the beginning of newly-started batches and on their consumption in mature reactors was tested. Regarding VFA extraction three leachate flush-rate conditions were studied: 0.5, 1 and 2Lkg(-1)TSd(-1). Results showed that increasing the leachate flush-rate during the acidification phase is essential to increase degradation kinetics...
January 30, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28214698/value-adding-conversion-and-volume-reduction-of-sewage-sludge-by-anaerobic-co-digestion-with-crude-glycerol
#3
Kensuke Kurahashi, Chie Kimura, You Fujimoto, Hayato Tokumoto
In this study, conversion of sewage sludge to biogas by anaerobic co-digestion with crude glycerol was examined. When 0.126g/L crude glycerol was added to the reactor, only methane was produced. Upon addition of 5.04g/L crude glycerol, hydrogen production occurred, and a significant amount of 1,3-propanediol (1,3-PDO) was generated in the liquid phase. On day 6, the dry weight was largely composed of organic acids (48%) and 1,3-PDO (17%), which are water-soluble. Degradation of 1,3-PDO was very slow, which is advantageous for recovery...
February 7, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28214696/unraveling-the-influence-of-the-cod-sulfate-ratio-on-organic-matter-removal-and-methane-production-from-the-biodigestion-of-sugarcane-vinasse
#4
Luma Sayuri Mazine Kiyuna, Lucas Tadeu Fuess, Marcelo Zaiat
Throughout the sugarcane harvest, it is common for sulfate to accumulate in the vinasse of sugar and ethanol plants. However, little is known regarding the influence of sulfate on the anaerobic digestion (AD) of vinasse, which may lead to severe performance losses. This study assessed the influence of various COD/sulfate ratios (12.0, 10.0 and 7.5) on both COD removal and methane (CH4) production from sugarcane vinasse AD. Batch assays were conducted in thermophilic conditions. At a COD/sulfate ratio of 7.5, CH4 production was 35% lower compared with a ratio of 12...
February 10, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28214447/influence-of-pressures-up-to-50bar-on-two-stage-anaerobic-digestion
#5
Wolfgang Merkle, Katharina Baer, Jonas Lindner, Simon Zielonka, Felix Ortloff, Frank Graf, Thomas Kolb, Thomas Jungbluth, Andreas Lemmer
The concept of pressurized two-stage anaerobic digestion integrates biogas production, purification and pressure boosting within one process. The produced methane-rich biogas can be fed into gas grids with considerably less purification effort. To investigate biogas production under high pressures up to 50bar, a lab scale two-stage anaerobic digestion system was constructed including one continuously operated pressurized methane reactor. This investigation examined the effects of different operating pressures in methane reactor (10, 25, 50bar) on biogas quantity and quality, pH value and process stability...
February 8, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28214441/enhanced-treatment-of-fischer-tropsch-f-t-wastewater-using-the-up-flow-anaerobic-sludge-blanket-coupled-with-bioelectrochemical-system-effect-of-electric-field
#6
Dexin Wang, Hongjun Han, Yuxing Han, Kun Li, Hao Zhu
The coupling of bioelectrochemical system (BES) with an up-flow anaerobic sludge blanket (UASB) was established for enhanced Fischer-Tropsch (F-T) wastewater treatment while the UASB (control group) was operated in parallel. The presence of electric field could offer system a more reductive micro-environment that lower the ORP values and maintain the appropriate pH range, resulting in the higher chemical oxygen demand (COD) removal efficiency and methane production for BES-UASB (86.8% and 2.31±0.1L/(L·d)) while those values in control group were 72...
February 7, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28214439/different-cultivation-methods-to-acclimatise-ammonia-tolerant-methanogenic-consortia
#7
Hailin Tian, Ioannis A Fotidis, Enrico Mancini, Irini Angelidaki
Bioaugmentation with ammonia tolerant-methanogenic consortia was proposed as a solution to overcome ammonia inhibition during anaerobic digestion process recently. However, appropriate technology to generate ammonia tolerant methanogenic consortia is still lacking. In this study, three basic reactors (i.e. batch, fed-batch and continuous stirred-tank reactors (CSTR)) operated at mesophilic (37°C) and thermophilic (55°C) conditions were assessed, based on methane production efficiency, incubation time, TAN/FAN (total ammonium nitrogen/free ammonia nitrogen) levels and maximum methanogenic activity...
February 11, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28213299/anaerobic-digestion-of-lignocellulosic-biomasses-pretreated-with-ceriporiopsis-subvermispora
#8
X Liu, S Hiligsmann, R Gourdon, R Bayard
Fungal pretreatment by Ceriporiopsis subvermispora of two forest residues (hazel and acacia branches) and two agricultural lignocellulosic residues (barley straw and sugarcane bagasse) were studied as a pretreatment to improve their subsequent anaerobic digestion for methane production. Biomass samples were grinded to 2 ranges of particle sizes (<4 or 1 mm), autoclaved, inoculated with two strains of C. subvermispora (ATCC 90467 and ATCC 96608) and incubated at 28 °C for 28 days. The effects of fungal pretreatment were assessed by analyzing the samples before and after incubations for dry solids mass, biochemical composition, bio-methane production (BMP) and availability of cellulose to hydrolysis...
February 14, 2017: Journal of Environmental Management
https://www.readbyqxmd.com/read/28210734/ceria-based-model-catalysts-fundamental-studies-on-the-importance-of-the-metal-ceria-interface-in-co-oxidation-the-water-gas-shift-co2-hydrogenation-and-methane-and-alcohol-reforming
#9
REVIEW
José A Rodriguez, David C Grinter, Zongyuan Liu, Robert M Palomino, Sanjaya D Senanayake
Model metal/ceria and ceria/metal catalysts have been shown to be excellent systems for studying fundamental phenomena linked to the operation of technical catalysts. In the last fifteen years, many combinations of well-defined systems involving different kinds of metals and ceria have been prepared and characterized using the modern techniques of surface science. So far most of the catalytic studies have been centered on a few reactions: CO oxidation, the hydrogenation of CO2, and the production of hydrogen through the water-gas shift reaction and the reforming of methane or alcohols...
February 17, 2017: Chemical Society Reviews
https://www.readbyqxmd.com/read/28208104/low-temperature-thermal-pre-treatment-of-municipal-wastewater-sludge-process-optimization-and-effects-on-solubilization-and-anaerobic-degradation
#10
Laleh Nazari, Zhongshun Yuan, Domenico Santoro, Siva Sarathy, Dang Ho, Damien Batstone, Chunbao Charles Xu, Madhumita B Ray
The present study examines the relationship between the degree of solubilization and biodegradability of wastewater sludge in anaerobic digestion as a result of low-temperature thermal pre-treatment. The main effect of thermal pre-treatment is the disintegration of cell membranes and thus solubilization of organic compounds. There is an established correlation between chemical oxygen demand (COD) solubilization and temperature of thermal pre-treatment, but results of thermal pre-treatment in terms of biodegradability are not well understood...
December 3, 2016: Water Research
https://www.readbyqxmd.com/read/28207755/effect-of-biogas-sparging-on-the-performance-of-bio-hydrogen-reactor-over-a-long-term-operation
#11
Chatchawin Nualsri, Prawit Kongjan, Alissara Reungsang, Tsuyoshi Imai
This study aimed to enhance hydrogen production from sugarcane syrup by biogas sparging. Two-stage continuous stirred tank reactor (CSTR) and upflow anaerobic sludge blanket (UASB) reactor were used to produce hydrogen and methane, respectively. Biogas produced from the UASB was used to sparge into the CSTR. Results indicated that sparging with biogas increased the hydrogen production rate (HPR) by 35% (from 17.1 to 23.1 L/L.d) resulted from a reduction in the hydrogen partial pressure. A fluctuation of HPR was observed during a long term monitoring because CO2 in the sparging gas and carbon source in the feedstock were consumed by Enterobacter sp...
2017: PloS One
https://www.readbyqxmd.com/read/28206980/fast-low-temperature-plasma-reduction-of-monolayer-graphene-oxide-at-atmospheric-pressure
#12
Michal Bodik, Anna Zahoranova, Matej Micusik, Nikola Bugarova, Zdeno Spitalsky, Maria Omastova, Eva Majkova, Matej Jergel, Peter Siffalovic
We report on an ultrafast plasma-based graphene oxide reduction method superior to the conventional vacuum thermal annealing and/or chemical reduction. The method is based on the effect of non-equilibrium atmospheric-pressure plasma generated by the diffuse coplanar surface barrier discharge in proximity of the graphene oxide layer. As the reduction time is of the order of seconds, the presented method is applicable to large-scale production of the reduced graphene oxide layers. The short reduction times are achieved by a high volume power density of plasma which is of the order of 100 W/cm<sup>3</sup>...
February 16, 2017: Nanotechnology
https://www.readbyqxmd.com/read/28205235/differences-in-the-nutrient-concentrations-in-vitro-methanogenic-potential-and-other-fermentative-traits-of-tropical-grasses-and-legumes-for-beef-production-systems-in-northern-australia
#13
Zoey Durmic, Carlos A Ramírez-Restrepo, Chris Gardiner, Christopher J O'Neill, Eman Hussein, Phillip E Vercoe
BACKGROUND: In northern Australia, beef cattle grazed extensively on tropical rangelands are responsible for 5 % of the nation's total greenhouse gas emissions. Methane (CH4 ) is a potent greenhouse gas and in grazing ruminants might be mitigated by selecting forages that, when consumed, produce less CH4 when fermented by rumen microbes. This study examined variability in the in vitro fermentation patterns including CH4 production of selected tropical grasses and legumes to identify candidates for CH4 mitigation in grazing livestock in northern Australia...
February 16, 2017: Journal of the Science of Food and Agriculture
https://www.readbyqxmd.com/read/28199922/the-performance-efficiency-of-bioaugmentation-to-prevent-anaerobic-digestion-failure-from-ammonia-and-propionate-inhibition
#14
Ying Li, Yue Zhang, Yongming Sun, Shubiao Wu, Xiaoying Kong, Zhenhong Yuan, Renjie Dong
This study aims to investigate the effect of bioaugmentation with enriched methanogenic propionate degrading microbial consortia on propionate fermentation under ammonia stress from total ammonia nitrogen concentration (TAN) of 3.0gNL(-1). Results demonstrated that bioaugmentation could prevent unstable digestion against further deterioration. After 45days of 1dosage (0.3g dry cell weight L(-1)d(-1), DCW L(-1)d(-1)) of bioaugmentation, the average volumetric methane production (VMP), methane recovery rate and propionic acid (HPr) degradation rate was enhanced by 70mLL(-1)d(-1), 21% and 51%, respectively...
February 3, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28198617/cometabolic-enzymatic-transformation-of-organic-micropollutants-under-methanogenic-conditions
#15
Lorena Gonzalez-Gil, Marta Carballa, Juan M Lema
Anaerobic digestion (AD) has been shown to have the biological potential to decrease the concentrations of several organic micropollutants (OMPs) from sewage sludge. However, the mechanisms and factors behind these biotransformations, which are essential for elucidating the possible transformation products and to foster the complete removal of OMPs via operational strategies, remain unclear. Therefore, this study investigated the transformation mechanisms of 20 OMPs during the methanogenic step of AD with a focus on the role of acetate kinase (AK), which is a key enzyme in methane production...
February 15, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28198083/syntrophobacteraceae-affiliated-species-are-major-propionate-degrading-sulfate-reducers-in-paddy-soil
#16
Pengfei Liu, Ralf Conrad
Methane is an important greenhouse gas and propionate is next to acetate the main intermediate (average 23%) of the carbon flow to CH4 in paddy fields. Sulfate (e.g., gypsum) application can reduce CH4 emissions up to 70%. However, the effect of gypsum application on propionate degradation and the microbial communities involved are not well understood. Therefore, we studied propionate-dependent sulfate reduction in anoxic microcosms of paddy soils from Italy and the Philippines, combining 16S rRNA and dissimilatory sulfite reductase (dsrB) gene profiling and co-occurrence network analysis...
February 15, 2017: Environmental Microbiology
https://www.readbyqxmd.com/read/28197650/impact-assessment-and-environmental-evaluation-of-various-ammonia-production-processes
#17
Yusuf Bicer, Ibrahim Dincer, Greg Vezina, Frank Raso
In the current study, conventional resources-based ammonia generation routes are comparatively studied through a comprehensive life cycle assessment. The selected ammonia generation options range from mostly used steam methane reforming to partial oxidation of heavy oil. The chosen ammonia synthesis process is the most common commercially available Haber-Bosch process. The essential energy input for the methods are used from various conventional resources such as coal, nuclear, natural gas and heavy oil. Using the life cycle assessment methodology, the environmental impacts of selected methods are identified and quantified from cradle to gate...
February 14, 2017: Environmental Management
https://www.readbyqxmd.com/read/28196757/influence-of-total-solids-concentration-on-the-anaerobic-co-digestion-of-sugar-beet-by-products-and-livestock-manures
#18
K Aboudi, C J Álvarez-Gallego, L I Romero-García
A series of batch anaerobic digestion assays were implemented to determine the influence of total solids concentration on the anaerobic digestion of sugar beet by-products and their co-digestion with two kind of livestock manures (pig and cow manures). The two total solid concentrations studied were 8% and 5%. Total solids contents above 8% were not evaluated because of the inappropriate rheological behaviour of sugar beet by-products at these concentrations. The best total solid content tested corresponded to 8%, achieving specific methane yields of 464...
February 10, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28191038/physiological-and-molecular-characterizations-of-the-interactions-in-two-cellulose-to-methane-cocultures
#19
Hongyuan Lu, Siu-Kin Ng, Yangyang Jia, Mingwei Cai, Patrick K H Lee
BACKGROUND: The interspecies interactions in a biomethanation community play a vital role in substrate degradation and methane (CH4) formation. However, the physiological and molecular mechanisms of interaction among the microbial members of this community remain poorly understood due to the lack of an experimentally tractable model system. In this study, we successfully established two coculture models combining the cellulose-degrading bacterium Clostridium cellulovorans 743B with Methanosarcina barkeri Fusaro or Methanosarcina mazei Gö1 for the direct conversion of cellulose to CH4...
2017: Biotechnology for Biofuels
https://www.readbyqxmd.com/read/28188987/effectiveness-of-phosphate-removal-during-anaerobic-digestion-of-waste-activated-sludge-by-dosing-iron-iii
#20
Xiang Cheng, Jue Wang, Bing Chen, Yu Wang, Jiaqi Liu, Lubo Liu
Phosphate-Fe(II) precipitation induced by Fe(III) reduction during the anaerobic digestion of excess activated sludge was investigated for the removal of phosphorus and its possible recovery. The experiments were conducted with three Fe(III) sources at 35 °C and 55 °C. The results show that ferrihydrite-Fe(III) was effectively reduced during the anaerobic sludge digestion by 63% and 96% under mesophilic and thermophilic conditions, respectively. Whereas FeCl3-Fe(III) was only mesophilically reducible and the reduction of hematite-Fe(III) was unnoticeable at either temperature...
February 8, 2017: Journal of Environmental Management
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