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Bioresource Technology

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https://www.readbyqxmd.com/read/28433905/pretreating-wheat-straw-by-phosphoric-acid-plus-hydrogen-peroxide-for-enzymatic-saccharification-and-ethanol-production-at-high-solid-loading
#1
Jingwen Qiu, Lunjie Ma, Fei Shen, Gang Yang, Yanzong Zhang, Shihuai Deng, Jing Zhang, Yongmei Zeng, Yaodong Hu
Wheat straw was pretreated by phosphoric acid plus hydrogen peroxide (PHP) for enzymatic hydrolysis and ethanol fermentation at high solid loadings. Results indicated solid loading could reach 20% with 77.4% cellulose-glucose conversion and glucose concentration of 164.9g/L in hydrolysate, it even was promoted to 25% with only 3.4% decrease on cellulose-glucose conversion as the pretreated-wheat straw was dewatered by air-drying. 72.9% cellulose-glucose conversion still was achieved as the minimized enzyme input of 20mg protein/g cellulose was employed for hydrolysis at 20% solid loading...
April 12, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28433900/production-of-new-human-milk-fat-substitutes-by-enzymatic-acidolysis-of-microalgae-oils-from-nannochloropsis-oculata-and-isochrysis-galbana
#2
Yongjin He, Changyang Qiu, Zheng Guo, Jian Huang, Mingzi Wang, Bilian Chen
Human milk fat substitutes (HMFs) with four kinds of n-3 fatty acid for infant formula were firstly synthesized using triacylglycerols (TAGs) from Nannochloropsis oculata rich in PA at the sn-2 position and free fatty acids (FFAs) from Isochrysis galbana rich in n-3 polyunsaturated fatty acids (n-3 PUFAs-ALA/SDA/DHA) via solvent-free acidolysis with Novozym 435, Lipozyme 435, TL-IM and RM-IM as biocatalysts. The results show that the resulting HMFs contain total n-3 PUFA of 13.92-17.12% and PA of 59.38-68.13% at the sn-2 position under the optimal conditions (mole ratio FFAs/TAG 3:1, 60°C (Novozym 435 and Lipozyme TL-IM) and 50°C (Lipozyme 435 and RM-IM), lipase loading 10%, reaction time 24h)...
April 12, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28433916/a-novel-method-for-contributing-to-composting-start-up-at-low-temperature-by-inoculating-cold-adapted-microbial-consortium
#3
Xin-Yu Xie, Yue Zhao, Qing-Hong Sun, Xue-Qin Wang, Hong-Yang Cui, Xu Zhang, Yan-Jie Li, Zi-Min Wei
Low temperature climate presented a technical challenge to start-up composting in northern region of China. This study investigated if the cold-adapted microbial consortium (CAMC) could promote composting start-up at low temperature. In this work, the CAMC was inoculated when food waste was composted at 10°C. The results showed that inoculating CAMC accelerated the piles temperature effectively, the piles passed through the start-up period within 37h. Moreover, the inoculants could enhance the abundances of dominant strains related to organic matters degradation rate...
April 11, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28433908/steam-torrefaction-of-eucalyptus-globulus-for-producing-black-pellets-a-pilot-scale-experience
#4
Luis E Arteaga-Pérez, Héctor Grandón, Mauricio Flores, Cristina Segura, Stephen S Kelley
Steam torrefaction of Eucalyptus globulus was performed at temperatures between 245°C and 265°C in a 100kg/h pilot plant. Torrefied biomass was then pelletized in a 300kg/h unit and the pellets were subject to durability, density and combustion tests. The structural changes measured with FTIR were studied along with the combustion behavior of the materials. Compositional analysis showed that increasing the torrefaction temperature reduced both hemicellulose fraction and overall mass yield (MY). Furthermore, there was a linear relationship between the energy yield (EY) and mass yield (EY=[1...
April 11, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28433903/one-step-production-of-biodiesel-from-wet-and-unbroken-microalgae-biomass-using-deep-eutectic-solvent
#5
Ying Pan, Md Asraful Alam, Zhongming Wang, Dalong Huang, Keqin Hu, Hongxuan Chen, Zhenhong Yuan
One-step and Two-step methods were studied for lipid extraction from wet and unbroken (water content is 65-67%) Chlorella sp. and Chlorococcum sp. (GN38) using deep eutectic solvent (DES) treated microalgae cells. Further we optimized the extraction process and studied on its underlying mechanism. Among all DES, Choline chloride-Acetic acid (Ch-Aa) DES treatment showed optimal conditions at the mass ratio of DES: methanol-H2SO4 (2.00%) mixture: algae biomass was 60:40:3 with reaction time was 60min, and the optimum temperature was 110°C (Chlorococcum sp...
April 11, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28433899/sustainable-production-of-a-new-generation-biofuel-by-lipase-catalyzed-esterification-of-fatty-acids-from-liquid-industrial-waste-biomass
#6
Athanasios Foukis, Olga A Gkini, Panagiota-Yiolanda Stergiou, Vasilios A Sakkas, Agapi Dima, Konstantina Boura, Athanasios Koutinas, Emmanuel M Papamichael
In this work we suggest a methodology comprising the design and use of cost-effective, sustainable, and environmentally friendly process for biofuel production compatible with the market demands. A new generation biofuel is produced using fatty acids, which were generated from acidogenesis of industrial wastes of bioethanol distilleries, and esterified with selected alcohols by immobilized Candida antarctica Lipase-B. Suitable reactors with significant parameters and conditions were studied through experimental design, and novel esterification processes were suggested; among others, the continuous removal of the produced water was provided...
April 11, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28432948/butanol-fermentation-of-the-brown-seaweed-laminaria-digitata-by-clostridium-beijerinckii-dsm-6422
#7
Xiaoru Hou, Nikolaj From, Irini Angelidaki, Wouter J J Huijgen, Anne-Belinda Bjerre
Seaweed represents an abundant, renewable, and fast-growing biomass resource for 3rd generation biofuel production. This study reports an efficient butanol fermentation process carried out by Clostridium beijerinckii DSM-6422 using enzymatic hydrolysate of the sugar-rich brown seaweed Laminaria digitata harvested from the coast of the Danish North Sea as substrate. The highest butanol yield (0.42g/g-consumed-substrates) compared to literature was achieved, with a significantly higher butanol:acetone-butanol-ethanol (ABE) molar ratio (0...
April 11, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28433912/achieving-partial-denitrification-through-control-of-biofilm-structure-during-biofilm-growth-in-denitrifying-biofilter
#8
Bin Cui, Xiuhong Liu, Qing Yang, Jianmin Li, Xueyang Zhou, Yongzhen Peng
Partial denitrification was one of most effective ways to provide nitrite for annamox; whereas very limited research has been done to achieve nitrite accumulation in biofilm system. In this study, partial denitrification was studied in a lab-scale denitrifying biofilter (DNBF). The results showed biofilm structure variations caused the differences between nitrate specific reduction rate (NaSRR) and nitrite specific reduction rate (NiSRR), which led to nitrite accumulation in different degree at different biofilm formation phases...
April 10, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28432951/microbial-communities-in-the-functional-areas-of-a-biofilm-reactor-with-anaerobic-aerobic-process-for-oily-wastewater-treatment
#9
Jianhua Li, Shanshan Sun, Ping Yan, Li Fang, Yang Yu, Yangdong Xiang, Di Wang, Yejing Gong, Yanjun Gong, Zhongzhi Zhang
Microbial communities in the functional areas of biofilm reactors with large height-diameter ratio using the anaerobic-aerobic (A/O) reflux process was investigated to treat heavy oil refinery wastewater without pretreatment. In the process, chemical oxygen demand (COD) and total nitrogen (TN) removal reached 93.2% and 82.8%, and the anaerobic biofilm reactor was responsible for 95% and 99%, respectively. Areas for hydrolysis acidification and acetic acid production, methane production, and COD recovery were obvious in the anaerobic reactor...
April 10, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28432949/dominance-of-candidate-saccharibacteria-in-a-membrane-bioreactor-treating-medium-age-landfill-leachate-effects-of-organic-load-on-microbial-communities-hydrolytic-potential-and-extracellular-polymeric-substances
#10
Nikolaos Remmas, Paraschos Melidis, Ioanna Zerva, Jon Bent Kristoffersen, Sofia Nikolaki, George Tsiamis, Spyridon Ntougias
A membrane bioreactor (MBR), accomplishing high nitrogen removal efficiencies, was evaluated under various landfill leachate concentrations (50, 75 and 100% v/v). Proteinous and carbohydrate extracellular polymeric substances (EPS) and soluble microbial product (SMP) were strongly correlated (p<0.01) with organic load, salinity and NH4(+)-N. Exceptionally high β-glucosidase activities (6700-10,100Ug(-1)) were determined during MBR operation with 50% v/v leachate, as a result of the low organic carbon availability that extendedly induced β-glucosidases to breakdown the least biodegradable organic fraction...
April 10, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28433917/hydrothermal-carbonisation-of-poultry-litter-effects-of-initial-ph-on-yields-and-chemical-properties-of-hydrochars
#11
Bashir M Ghanim, Witold Kwapinski, James J Leahy
In this study, hydrothermal carbonisation (HTC) of poultry litter (PL) was carried out to evaluate the impact of initial pH using acetic acid (CH3COOH) or sulfuric acid (H2SO4) on the yields and properties of hydrochar (HC). The PL samples were treated by HTC at various initial pH and at 250°C for 2h. The HCs produced were characterized by ultimate, proximate and fibre analyses as well as heating value and surface area measurements. The results indicated that undertaking HTC in the presence of acids (CH3COOH, H2SO4) significantly affects the yields and properties of HC...
April 9, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28433915/stimulation-of-the-anaerobic-digestion-of-the-dry-organic-fraction-of-municipal-solid-waste-ofmsw-with-carbon-based-conductive-materials
#12
Yan Dang, Dezhi Sun, Trevor L Woodard, Li-Ying Wang, Kelly P Nevin, Dawn E Holmes
Growth of bacterial and archaeal species capable of interspecies electron exchange was stimulated by addition of conductive materials (carbon cloth or granular activated carbon (GAC)) to anaerobic digesters treating dog food (a substitute for the dry-organic fraction of municipal solid waste (OFMSW)). Methane production (772-1428mmol vs <80mmol), volatile solids removal (78%-81% vs 54%-64%) and COD removal efficiencies (∼80% vs 20%-30%) were all significantly higher in reactors amended with GAC or carbon cloth than controls...
April 9, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28433911/enhanced-nitrogen-removal-by-membrane-aerated-nitritation-anammox-in-a-bioelectrochemical-system
#13
Yuli Yang, Xiaojin Li, Xiaoli Yang, Zhen He
A bioelectrochemical system (BES) containing membrane-aerated nitritation-anammox in its cathode has been developed for enhancing nitrogen removal. Long-term performance and microbial community structure were investigated. The BES using loop operation and external voltage achieved the highest total nitrogen removal efficiency of 94.8±7.7%, and COD removal of 98.2±3.3% at hydraulic retention time of 60h and the lumen pressure of 10psi. The energy consumption of the system was 0.90kWhkgN(-1) or 0.38kWhkg COD(-1)...
April 9, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28433901/significantly-enhanced-enzymatic-hydrolysis-of-rice-straw-via-a-high-performance-two-stage-deep-eutectic-solvents-synergistic-pretreatment
#14
Xue-Dan Hou, Guo-Jian Feng, Mei Ye, Chao-Mei Huang, Yi Zhang
A two-stage deep eutectic solvents (DESs) treatment was shown to be an effective method for improving the utilization of certain DESs, and the specific order of pretreatment, such as malic acid/proline (MP) or choline chloride/oxalic acid (CO) during the first stage and choline chloride/urea (CU) during the second stage, resulted in better performance for enhancing the sugar yield due to the synergistic effect of the two DESs on biomass fractionation. Moreover, the presence of water during these processes could balance the loss of components by tuning the pretreatment severity, thus ensuring higher sugar yields...
April 9, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28433897/low-temperature-microwave-assisted-pyrolysis-of-wood-sawdust-for-phenolic-rich-compounds-kinetics-and-dielectric-properties-analysis
#15
Hu Luo, Liwei Bao, Lingzhao Kong, Yuhan Sun
Microwave-assisted pyrolysis of wood sawdust for phenolic rich compounds was carried out between 400 and 550°C in a batch reactor. An efficient preparation of liquid products was observed at 500°C with a yield of 58.50%, which was similar to conventional fast pyrolysis. The highest concentration of phenolic compounds in liquid product reached up to 78.7% (area) in which the alkoxy phenols contributed 81.8% at 500°C. Microwave thermogravimetric analysis using KAS method was used firstly to investigate the low-temperature pyrolytic behaviors and activation energy...
April 9, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28433896/in-situ-sludge-pretreatment-in-a-single-stage-anaerobic-digester
#16
Yun Chen, Keke Xiao, Xie Jiang, Nan Shen, Raymond J Zeng, Yan Zhou
This study aimed to develop an in-situ sludge pretreatment method by increasing the temperature from thermophilic to extreme thermophilic condition in a single-stage anaerobic digester. The results revealed that a stable performance was obtained within the temperature range of 55-65°C, and the maximum methane yield of 208.51±13.66mL/g VS was obtained at 65°C. Moreover, the maximum extent of hydrolysis (33%) and acidification (27.1%) was also observed at 65°C. However, further increase of temperature to 70°C did not improve the organic conversion efficiency...
April 9, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28433585/scale-up-for-esters-production-from-straw-whiskers-for-biofuel-applications
#17
Agapi Dima, Konstantina Boura, Argyro Bekatorou, Panagiota-Yiolanda Stergiou, Athanasios Foukis, Olga A Gkini, Panagiotis Kandylis, Katerina Pissaridi, Maria Kanellaki, Emmanuel M Papamichael, Athanasios A Koutinas
Delignified wheat straw was fermented by a mixed bacterial anaerobic culture obtained from a UASB reactor to produce organic acids (OAs). Kissiris was used as immobilization carrier in a 2-compartment 82L bioreactor filled with 17L of fermentation broth for the first 7 fermentation batches and up to 40L for the subsequent batches. The amount of straw used was 30g/L and the temperature was set at 37°C for all experiments. The total OAs reached concentrations up to 17.53g/L and the produced ethanol ranged from 0...
April 9, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28433582/effects-of-twenty-standard-amino-acids-on-biochemical-constituents-docosahexaenoic-acid-production-and-metabolic-activity-changes-of-crypthecodinium-cohnii
#18
Waseem Safdar, Xinyi Zan, Muhammad Shamoon, Hafiz Rizwan Sharif, Omar Mukama, Xin Tang, Yuanda Song
The influence of 20 standard amino acids was investigated on growth, lipid accumulation, docosahexaenoic acid (DHA) production and cell biochemical composition of Crypthecodinium cohnii. C. cohnii efficiently utilize organic nitrogen (predominantly threonine and to a lesser extent tyrosine and serine) as compared to inorganic nitrogen (NH4)2SO4. However, No significant effect was observed on major biochemical composition of C. cohnii (lipids, carbohydrates and proteins) under N limitation or supplementation with different N-sources...
April 9, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28432952/removal-of-antibiotics-from-piggery-wastewater-by-biological-aerated-filter-system-treatment-efficiency-and-biodegradation-kinetics
#19
Jun Chen, You-Sheng Liu, Jin-Na Zhang, Yong-Qiang Yang, Li-Xin Hu, Yuan-Yuan Yang, Jian-Liang Zhao, Fan-Rong Chen, Guang-Guo Ying
This study aimed to investigate the removal efficiency and mechanism for antibiotics in swine wastewater by a biological aerated filter system (BAF system) in combination with laboratory aerobic and anaerobic incubation experiments. Nine antibiotics including sulfamonomethoxine, sulfachloropyridazine, sulfamethazine, trimethoprim, norfloxacin, ofloxacin, lincomycin, leucomycin and oxytetracycline were detected in the wastewater with concentrations up to 192,000ng/L. The results from this pilot study showed efficient removals (>82%) of the conventional wastewater pollutants (BOD5, COD, TN and NH3-N) and the detected nine antibiotics by the BAF system...
April 9, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28433904/biodegradation-of-naproxen-by-freshwater-algae-cymbella-sp-and-scenedesmus-quadricauda-and-the-comparative-toxicity
#20
Tengda Ding, Kunde Lin, Bo Yang, Mengting Yang, Juying Li, Wenying Li, Jay Gan
Naproxen is one of the most prevalent pharmaceuticals and of great environment concern. Information about bioremediation of naproxen by algae remains limited and no study has been reported on the degradation mechanism and the toxicity of NPX on algae. In this study, both Cymbella sp. and Scenedesmus quadricauda showed complete growth inhibition (100%) at 100mgL(-1) within 24h. Biochemical characteristics including chlorophyll a, carotenoid contents and enzyme activities for these two microalgae were affected by NPX at relatively high concentrations after 4d of exposure...
April 8, 2017: Bioresource Technology
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