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https://www.readbyqxmd.com/read/28651321/methane-production-and-characteristics-of-the-microbial-community-in-a-two-stage-fixed-bed-anaerobic-reactor-using-molasses
#1
Xingyao Meng, Xufeng Yuan, Jiwei Ren, Xiaofen Wang, Wanbin Zhu, Zongjun Cui
Molasses is a typical feedstock for fermentation, but the effluent is hard to treat. In this study, molasses containing a high concentration of organic matter was treated by a two-stage Fix-bed reactor system with an increased organic loading rate (OLR). The results indicated at high molasses loading rate, the two-stage system was more efficient (i.e. organic matter removal, the COD of effluent and biogas production) than the single-stage system. The relative abundance of Anaerolineaceae and W5_norank was higher in the first stage (R1), where these organisms digest carbohydrates, while the second stage (R2) had higher relative abundance of Synergistaceae and SB-1_norank, which digest VFAs and decomposition-resistant compounds to produce compounds used by hydrogen methanogens...
May 31, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28651143/elemental-migration-and-characterization-of-products-during-hydrothermal-liquefaction-of-cornstalk
#2
Zhangbing Zhu, Buchun Si, Jianwen Lu, Jamison Watson, Yuanhui Zhang, Zhidan Liu
Biofuel production from lignocellulosic biomass through hydrothermal liquefaction (HTL) is a promising direction. This study characterized the products and investigated the elemental migration during the HTL of cornstalk at seven different operation temperatures (210-375°C). The biocrude oil yield significantly increased from 7.04% (210°C) to 23.32% (290°C) as the temperature increased, and decreased to 21.07% when further increased to 375°C. A carbon recovery of 11.03-38.69%, and a hydrogen recovery of 7...
June 19, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28651084/treatment-of-food-waste-recycling-wastewater-using-anaerobic-ceramic-membrane-bioreactor-for-biogas-production-in-mainstream-treatment-process-of-domestic-wastewater
#3
Yeongmi Jeong, Slawomir W Hermanowicz, Chanhyuk Park
A bench-scale anaerobic membrane bioreactor (AnMBR) equipped with submerged flat-sheet ceramic membranes was operated at mesophilic conditions (30-35 °C) treating domestic wastewater (DWW) supplemented with food wasterecycling wastewater (FRW) to increase the organic loading rate (OLR) for better biogas production. Coupling ceramic membrane filtration with AnMBR treatment provides an alternative strategy for high organic wastewater treatment at short hydraulic retention times (HRTs) with the potential benefits of membrane fouling because they have a high hydrophilicity and more robust at extreme conditions...
June 19, 2017: Water Research
https://www.readbyqxmd.com/read/28650164/effect-of-ancillary-ligands-a-on-oxidative-addition-of-ch4-to-re-iii-complexes-a-b-al-ch-sih-n-p-using-mp2-ccsd-t-and-mcscf-methods
#4
Riffat Parveen, Thomas R Cundari
A computational study of oxidative addition (OA) of methane to Re(OC2H4)3A (A = ancillary ligand, which thus may interact with the metal) was carried out. The choice of ancillary ligands has been made based on their electronic properties: A = B or Al (Lewis acid), CH or SiH (electron precise), N (σ-donor) and P (σ-donor/π-acid). The main objective of this study was to understand how variation in A affects the structural and electronic properties of the reactant d(4)-Re(III) complex, which can ultimately tune the kinetics and thermodynamics of OA...
June 26, 2017: Journal of Physical Chemistry. A
https://www.readbyqxmd.com/read/28648747/anaerobic-co-digestion-of-chicken-manure-and-microalgae-chlorella-sp-methane-potential-microbial-diversity-and-synergistic-impact-evaluation
#5
Ruirui Li, Na Duan, Yuanhui Zhang, Zhidan Liu, Baoming Li, Dongming Zhang, Taili Dong
Anaerobic digestion (AD) is a promising alternative for livestock manure management. This paper presents the experimental results obtained through a batch experiment by using chicken manure (CM) and microalgae Chlorella sp. as co-substrates. The effect of co-digestion was evaluated by varying CM to Chlorella sp. ratios (0:10, 2:8, 4:6, 6:4, 8:2, 10: 0 based on the volatile solids (VS)). The major objective of this study is to evaluate the feasibility and synergistic impact of co-digestion of CM and Chlorella sp...
June 22, 2017: Waste Management
https://www.readbyqxmd.com/read/28648745/batch-anaerobic-digestion-of-deproteinated-malt-whisky-pot-ale-using-different-source-inocula
#6
Raquel Barrena, Julio E Traub, Cristina Rodriguez Gil, Julian A S Goodwin, Alan J Harper, Nik A Willoughby, Antoni Sánchez, Thomas J Aspray
A novel process has been developed for the selective removal of protein from pot ale with recovered protein holding potential as a value-added by-product for the whisky industry. The purpose of this work was to assess the effect of deproteination on pot ale physicochemical characterisation and anaerobic digestion (AD) treatment. Pot ales were taken from five malt whisky distilleries and tested untreated, after centrifugation/filtration and after deproteination at laboratory or pilot scale. At laboratory scale, the deproteination process removed around 20% of total chemical oxygen demand (tCOD) from untreated pot ale and at least 30% dissolved copper from centrifuged pot ale...
June 22, 2017: Waste Management
https://www.readbyqxmd.com/read/28648259/semisynthesis-and-spectral-characterization-of-5-methylpyranopelargonidin-and-4-methylfuropelargonidin-and-their-separation-and-detection-in-strawberry-fruit-wine
#7
Ondřej Kurka, Lukáš Kučera, Helena Pelantová, Marek Kuzma, Vladimír Havlíček, Petr Bednář
Condensation of anthocyanins and their aglycons with small organic molecules yields more stable natural dyes, e.g. pyranoanthocyanins arising spontaneously in various food products. Reaction of pelargonidin with acetone produces two isomeric anthocyanidin dyes - 5-methylpyranopelargonidin and 4-methylfuropelargonidin. A robust semipreparative liquid chromatographic method was developed to isolate both derivatives from a simple aged solution of pelargonidin in methanol: acetone: 37% aqueous hydrochloric acid (1:1:0...
June 17, 2017: Journal of Chromatography. A
https://www.readbyqxmd.com/read/28647240/ammonia-and-greenhouse-gas-emissions-from-a-subtropical-wheat-field-under-different-nitrogen-fertilization-strategies
#8
Shuai Liu, Jim J Wang, Zhou Tian, Xudong Wang, Stephen Harrison
Minimizing soil ammonia (NH3) and nitrous oxide (N2O) emission factors (EFs) has significant implications in regional air quality and greenhouse gas (GHG) emissions besides nitrogen (N) nutrient loss. The aim of this study was to investigate the impacts of different N fertilizer treatments of conventional urea, polymer-coated urea, ammonia sulfate, urease inhibitor (NBPT, N-(n-butyl) thiophosphoric triamide)-treated urea, and nitrification inhibitor (DCD, dicyandiamide)-treated urea on emissions of NH3 and GHGs from subtropical wheat cultivation...
July 2017: Journal of Environmental Sciences (China)
https://www.readbyqxmd.com/read/28647121/dna-based-stable-isotope-probing-identifies-formate-metabolizing-methanogenic-archaea-in-paddy-soil
#9
Jiangbing Xu, Zhongjun Jia, Xiangui Lin, Youzhi Feng
Paddy methane (CH4) production is biologically dominated by methanogenic archaea that metabolize a variety of organic and/or inorganic carbon sources. Though formate is easily dissimilated into H2/CO2, formate-metabolizing methanogenic archaea are distinct from CO2-utilizing methanogen taxa. The identity of formate-metabolizing methanogenic archaea in paddy soil remains elusive. In this investigation, molecular approaches based on stable isotope probing (SIP) technique were conducted to identify the formate-metabolizing methanogenic archaea in paddy soil...
September 2017: Microbiological Research
https://www.readbyqxmd.com/read/28646447/microbial-transformations-of-selenite-by-methane-oxidizing-bacteria
#10
Abdurrahman S Eswayah, Thomas J Smith, Andreas C Scheinost, Nicole Hondow, Philip H E Gardiner
Methane-oxidizing bacteria are well known for their role in the global methane cycle and their potential for microbial transformation of wide range of hydrocarbon and chlorinated hydrocarbon pollution. Recently, it has also emerged that methane-oxidizing bacteria interact with inorganic pollutants in the environment. Here, we report what we believe to be the first study of the interaction of pure strains of methane-oxidizing bacteria with selenite. Results indicate that the commonly used laboratory model strains of methane-oxidizing bacteria, Methylococcus capsulatus (Bath) and Methylosinus trichosporium OB3b, are both able to reduce the toxic selenite (SeO3(2-)) but not selenate (SeO4(2-)) to red spherical nanoparticulate elemental selenium (Se(0)), which was characterized via energy-dispersive X-ray spectroscopy (EDXS), X-ray absorption near-edge structure (XANES) and extended X-ray absorption fine structure (EXAFS)...
June 23, 2017: Applied Microbiology and Biotechnology
https://www.readbyqxmd.com/read/28642078/experimental-tests-on-commercial-sweet-product-residue-spr-as-a-suitable-feed-for-anaerobic-bioenergy-h2-ch4-production
#11
Andrea C Luongo Malavè, Debora Fino, Carlos E Gómez Camacho, Bernardo Ruggeri
Food stores can find themselves in the position of having to dispose of different types of products, such as snacks, confectionery, prepackaged food, drinks and others, Sweet Product Residue (SPR), which presents a great opportunity to produce energy through Anaerobic Digestion (AD), due to its high sugar, carbohidrate and fat contents. In order to valorise SPR, this paper takes into consideration the all necessary treatments; owing the fact that the refuses are constitute by an organic part and packaging (plastic, paper and their combinations), a pretreatment able to remove the latter is necessary...
June 19, 2017: Waste Management
https://www.readbyqxmd.com/read/28640193/identification-of-light-independent-anthocyanin-biosynthesis-mutants-induced-by-ethyl-methane-sulfonate-in-turnip-tsuda-brassica-rapa
#12
Jian-Fei Yang, Yun-Zhu Chen, Saneyuki Kawabata, Yu-Hua Li, Yu Wang
The epidermis of swollen storage roots in purple cultivars of turnip "Tsuda" (Brassica rapa) accumulates anthocyanin in a light-dependent manner, especially in response to UV-A light, of which the mechanism is unclear. In this study, we mutagenized 15,000 seeds by 0.5% (v/v) ethyl methane sulfonate (EMS) and obtained 14 mutants with abnormal anthocyanin production in their epidermis of swollen storage roots. These mutants were classified into two groups: the red mutants with constitutive anthocyanin accumulation in their epidermis of storage roots even in underground parts in darkness and the white mutants without anthocyanin accumulation in the epidermis of storage roots in aboveground parts exposed to sunlight...
June 22, 2017: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/28637304/effects-of-alternative-electron-acceptors-on-the-activity-and-community-structure-of-methane-producing-and-consuming-microbes-in-the-sediments-of-two-shallow-boreal-lakes
#13
Antti J Rissanen, Anu Karvinen, Hannu Nykänen, Sari Peura, Marja Tiirola, Anita Mäki, Paula Kankaala
The role of anaerobic CH4 oxidation in controlling lake sediment CH4 emissions remains unclear. Therefore, we tested how relevant EAs (SO42-, NO3-, Fe3+, Mn4+, O2) affect CH4 production and oxidation in the sediments of two shallow boreal lakes. The changes induced to microbial communities by the addition of Fe3+ and Mn4+ were studied using next-generation sequencing targeting the 16S rRNA and methyl-coenzyme M reductase (mcrA) genes and mcrA transcripts. Putative anaerobic CH4 oxidizing archaea (ANME-2D) and bacteria (NC 10) were scarce (up to 3...
June 15, 2017: FEMS Microbiology Ecology
https://www.readbyqxmd.com/read/28637159/methane-production-and-fertilizing-value-of-organic-waste-organic-matter-characterization-for-a-better-prediction-of-valorization-pathways
#14
Julie Jimenez, Han Lei, Jean-Philippe Steyer, Sabine Houot, Dominique Patureau
Organic wastes are potential sources of both energy as well as crop production fertilizers. Correlations and models, involving organic matter characterization, have been previously described by several authors although there is still a lack in knowledge on the potential of simultaneous predictions of methane and organic fertilizer quality to optimize the wastes treatments. A methodology combining chemical accessibility and fluorescence spectroscopy was used to characterize 82 different organic wastes. Characterization data were compared with the biochemical methane potential (BMP), and with the biodegradable organic carbon obtained by soil incubation (C_bio)...
May 31, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28633966/the-effect-of-feed-composition-on-anaerobic-co-digestion-of-animal-processing-by-products
#15
D Hidalgo, J M Martín-Marroquín, F Corona
Four streams and their mixtures have been considered for anaerobic co-digestion, all of them generated during pig carcasses processing or in related industrial activities: meat flour (MF), process water (PW), pig manure (PM) and glycerin (GL). Biochemical methane potential assays were conducted at 37 °C to evaluate the effects of the substrate mix ratio on methane generation and process behavior. The results show that the co-digestion of these products favors the anaerobic fermentation process when limiting the amount of meat flour in the mixture to co-digest, which should not exceed 10%...
June 17, 2017: Journal of Environmental Management
https://www.readbyqxmd.com/read/28633838/sonochemically-preparation-and-characterization-of-bimetallic-ni-co-al2o3-zro2-nanocatalyst-effects-of-ultrasound-irradiation-time-and-power-on-catalytic-properties-and-activity-in-dry-reforming-of-ch4
#16
Salar Mahboob, Mohammad Haghighi, Farhad Rahmani
The catalytic performance of nanostructured Ni-Co/Al2O3-ZrO2 catalysts, prepared by ultrasound-assisted impregnation method was examined in the dry reforming of methane. The effect of irradiation power and irradiation time have been studied by changing time (0, 20, 80min) and power of the sonication (30, 60, 90W) during the synthesis which resulted in different physiochemical properties of the nanocatalyst. The nanocatalysts were characterized by XRD, FESEM, PSD, EDX, TEM, TPR-H2, BET, FTIR and TG analyses...
September 2017: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/28633517/biomethanation-of-sewage-sludge-with-food-waste-leachate-via-co-digestion
#17
Jingyeong Shin, Young Beom Kim, Jong Hun Jeon, Sangki Choi, In Kyu Park, Young Mo Kim
Anaerobic mono- and co-digestion of sewage sludge (SS) and food waste leachate (FWL) were performed by assessing methane production and characterizing microbial communities. Anaerobic digestion (AD) of waste activated sludge (WAS) alone produced the lowest methane production (281 mL-CH4), but an approximately 80% increase in methane production was achieved via co-digestion of WAS and FWL (506 mL-CH4). There were less differences in the diversity of bacterial communities in anaerobic digesters, while archaeal (ARC) and bacterial (BAC) amounts reflected AD's performance...
June 21, 2017: Journal of Microbiology and Biotechnology
https://www.readbyqxmd.com/read/28630917/mntio3-driven-low-temperature-oxidative-coupling-of-methane-over-tio2-doped-mn2o3-na2wo4-sio2-catalyst
#18
Pengwei Wang, Guofeng Zhao, Yu Wang, Yong Lu
Oxidative coupling of methane (OCM) is a promising method for the direct conversion of methane to ethene and ethane (C2 products). Among the catalysts reported previously, Mn2O3-Na2WO4/SiO2 showed the highest conversion and selectivity, but only at 800° to 900°C, which represents a substantial challenge for commercialization. We report a TiO2-doped Mn2O3-Na2WO4/SiO2 catalyst by using Ti-MWW zeolite as TiO2 dopant as well as SiO2 support, enabling OCM with 26% conversion and 76% C2-C3 selectivity at 720°C because of MnTiO3 formation...
June 2017: Science Advances
https://www.readbyqxmd.com/read/28629709/energy-recovery-from-one-and-two-stage-anaerobic-digestion-of-food-waste
#19
Giorgia De Gioannis, Aldo Muntoni, Alessandra Polettini, Raffaella Pomi, Daniela Spiga
One- and two-stage anaerobic digestion of food waste aimed at recovering methane (CH4) and hydrogen and methane (H2+CH4), respectively, were compared in order to assess the potential benefits from the two-stage process in terms of overall energy recovery. Results suggest that a two-stage process where the first reactor is properly operated in order to achieve a significant net hydrogen production, may display a 20% comparatively higher energy recovery yield as a result, mainly, of enhanced methane production as well as of the associated hydrogen production...
June 16, 2017: Waste Management
https://www.readbyqxmd.com/read/28629708/comparative-use-of-different-emission-measurement-approaches-to-determine-methane-emissions-from-a-biogas-plant
#20
Torsten Reinelt, Antonio Delre, Tanja Westerkamp, Magnus A Holmgren, Jan Liebetrau, Charlotte Scheutz
A sustainable anaerobic biowaste treatment has to mitigate methane emissions from the entire biogas production chain, but the exact quantification of these emissions remains a challenge. This study presents a comparative measurement campaign carried out with on-site and ground-based remote sensing measurement approaches conducted by six measuring teams at a Swedish biowaste treatment plant. The measured emissions showed high variations, amongst others caused by different periods of measurement performance in connection with varying operational states of the plant...
June 16, 2017: Waste Management
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