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Bioresource Technology

Liying Wang, Lingtian Wu, Qiaoyu Chen, Sha Li, Yibo Zhu, Jinnan Wu, Jianlin Chu, Shanshan Wu
This work focuses on the development of non-food fermentation for the cost-effective biosynthesis of exopolysaccharide (EPS) by using a new strain of Kosakonia cowanii LT-1. This novel strain more efficiently utilizes sucrose for EPS production than other glycosyl donors. Comparative transcriptomic analysis is used to understand EPS synthesis promotion and the effects of sucrose on EPS biosynthesis. We speculate that ATP-binding cassette transporter, phosphotransferase, and two-component systems may be the most essential factors for EPS biosynthesis...
February 11, 2019: Bioresource Technology
Miriam Kellock, Hannu Maaheimo, Kaisa Marjamaa, Jenni Rahikainen, Heng Zhang, Ulla Holopainen-Mantila, John Ralph, Tarja Tamminen, Claus Felby, Kristiina Kruus
Hydrothermal pretreatment is commonly used for enhancing enzymatic hydrolysis of lignocellulosics. Spruce and wheat straw were pretreated with increasing severity and lignin characteristics were analysed. The effect of enzymatically isolated lignin on the hydrolysis of Avicel and the adsorption of a cellobiohydrolase onto lignin was measured. Non-pretreated lignins had only a minor effect on Avicel hydrolysis. The structural changes in lignin accompanying hydrothermal pretreatment were associated with increased binding and inactivation of the cellulase on the lignin surface...
February 10, 2019: Bioresource Technology
Xiaozhen Chen, Xiaojun Wang, Xiaokun Chen, Zhong Zhong, Zhenguo Chen, Jing Chen, Yuanzhen Jiang
Influences of various concentrations of salinity (NaCl 0-25.0 g/L) on partial nitritation performance in a zeolite biological aerated filter (ZBAF) were investigated. The highest nitrite production rate (NPR) of 1.357 kg/(m3 ·d) and nitrite accumulation rate (NAR) of 99.0% was achieved with salt free wastewater. While after adding extra salt, NPR and ammonium removal efficiency (ARE) presented an obvious decline trend. The lowest NPR (0.599 kg/(m3 ·d)) and ARE (34.2%) were obtained with salinity of 25...
February 10, 2019: Bioresource Technology
Rochak Mittal, Richa Sharma, Ksms Raghavarao
Aqueous two-phase extraction (ATPE) of R-Phycoerythrin (R-PE), a fluorescent and commercially valuable protein, was carried out in two parallel schemes. In scheme-1, ATPE alone was employed, and in scheme-2, process-integration was attempted, where primary extract was subjected to precipitation before standardization of process parameters of ATPE. Scheme-1 with polyethylene glycol (PEG)-3350/potassium phosphate system has resulted in very low R-PE yield (26% w/w) without much enrichment in purity (0.3). In scheme-2, PEG-1450/potassium phosphate system (pH 6, tie-line length 12...
February 10, 2019: Bioresource Technology
Zedong Zhang, Delin Li, Xin Zhang
The aim of this work was to study the ability of commercial immobilized hydrolases in the decolorization of molasses wastewater. Commercial immobilized keratinase obtained the highest decolorization yield (86.6-91.1%) among all of commercial immobilized enzymes tested. Immobilized keratinase had the potential to replace immobilized oxidoreductase to decolorize molasses wastewater. Keratinase from Meiothermus taiwanensis WR-220 (KMT) immobilized on modified bagasse cellulose obtained a decolorization yield of 84...
February 10, 2019: Bioresource Technology
Flinn De Vleeschauwer, Michel Caluwé, Thomas Dobbeleers, Hannah Stes, Lennert Dockx, Filip Kiekens, Jolien D'aes, Cosmin Copot, Jan Dries
Treatment of rapidly varying wastewaters in anaerobic/aerobic aerobic granular sludge (AGS) systems remains problematic. This study investigated AGS formation and the impact of varying COD and phosphorus concentrations on an enhanced biological phosphorus removal (EBPR) AGS SBR with a conductivity based anaerobic and OUR based aerobic dynamically controlled step. Phase 1 investigated the development of AGS. Phase 2 examined the flexibility of the dynamic control strategy and AGS efficiency while rapidly altering the influent composition...
February 10, 2019: Bioresource Technology
Qian Lu, Pei Han, Fufeng Chen, Tonggui Liu, Jun Li, Lijian Leng, Jingjing Li, Wenguang Zhou
Owning to the ammonium toxicity, some ammonium-rich wastewater may not be used for algae cultivation. To overcome this problem, herein, a novel approach of using zeolite to mitigate ammonium toxicity in wastewater for value-added Spirulina production was proposed. Synthetic zeolite was used as medium for ammonium adsorption in wastewater and subsequently as slow-releaser providing nitrogen to Spirulina growth. The optimal conditions for ammonium adsorption include pH value of 8.0, zeolite dose of 300 g/L, and adsorption time of 9 h...
February 10, 2019: Bioresource Technology
Yang Yu, Qiang An, Ying Zhou, Shuman Deng, Yue Miao, Bin Zhao, Li Yang
Pseudomonas stutzeri strain XL-2 presented efficient ammonium removal due to heterotrophic nitrification-aerobic denitrification. The modified walnut shell biochar also showed ammonium adsorption due to chemical interaction. The complex of modified biochar and strain XL-2 exhibited excellent synergistic effects on ammonium removal, especially in unfavorable environment. The maximum average ammonium removal rate of the complex was 4.40 mg·L-1 ·h-1 , which was 3.01 times higher than that of pure bacteria and 5...
February 8, 2019: Bioresource Technology
Ibrahim Nasser Ahmed, Xiu-Li Yang, Amare Aregahegn Dubale, Rong Shao, Rong-Feng Guan, Xiangming Meng, Ming-Hua Xie
Metal-organic framework (MOF) assisted hydrothermal pretreatment and co-catalysis strategy based on UiO-66 MOF is developed for the first time. The Planetree exfoliating bark was pretreated with or without UiO-66 assisted hydrothermal method at a temperature ranging from 160 to 240 °C for 1-3 h residence. With the rise of pretreatment severity, the total reducing sugar (TRS) was increased till reached maximum, 180 mg g-1 , in the presence of UiO-66. The fitting models validate the optimal hydrothermal condition was at 180 °C and 1 h, which was characterized with high TRS and very low yield of furfural and HMF...
February 8, 2019: Bioresource Technology
Yi Li, Zhiyu Zhang, Yingxing Duan, Hailei Wang
Microalgal cultivation and harvesting are two main factors that restrict the development of microalgae. To help solve these two questions, flocculating bacteria and recycling culture medium were investigated in this study. Proteins in bacterial cells of Bacillus sp. y3 and y6 exhibited direct flocculation activities on Chlorella vulgaris cells. The recycling culture media after harvest of microalgal biomass by strain y3 and y6 could promote C. vulgaris growth. The determination of bacterial community confirmed that strain Bw in C...
February 8, 2019: Bioresource Technology
Bolin Li, Wenkai Yan, Yue Wang, Heng Wang, Zhi Zhou, Ye Li, Wenqin Zhang
Recently, a flocculent-granular hybrid reactor was reported as a novel nitrogen removal system; however, the mechanisms of stable operation in the system remain unclear. In this study, the mechanisms of the stable nitrogen removal performance in a flocculent-granular hybrid system were investigated with temperature reduction. The operational period was divided into three phases with different temperatures ranges. In phase I, the nitrogen removal efficiency was stabilized at about 90% with nitrogen removal load maintained at approximately 0...
February 8, 2019: Bioresource Technology
Dinh Duc Nguyen, Byong-Hun Jeon, Jae Hoon Jeung, Eldon R Rene, J Rajesh Banu, Balasubramani Ravindran, Cuong Manh Vu, Huu Hao Ngo, Wenshan Guo, Soon Woong Chang
The main aim of this work was to test various organic wastes, i.e. from a livestock farm, a cattle slaughterhouse and agricultural waste streams, for its ability to produce methane under thermophilic anaerobic digestion (AD) conditions. The stability of the digestion, potential biomethane production and biomethane production rate for each waste were assessed. The highest methane yield (110.83 mL CH4 /g VSadded  day) was found in the AD of crushed animal carcasses on day 4. The experimental results were analyzed using four kinetic models and it was observed that the Cone model described the biomethane yield as well as the methane production rate of each substrate...
February 7, 2019: Bioresource Technology
Kaixu Li, Wei Chen, Haiping Yang, Yingquan Chen, Sunwen Xia, Mingwei Xia, Xin Tu, Hanping Chen
The effect of chemical activation and NH3 modification on activated carbons (ACs) was explored via two contrasting bamboo pyrolysis strategies involving either two steps (activation followed by nitrogen doping in NH3 atmosphere) or one step (activation in NH3 atmosphere) with several chemical activating reagents (KOH, K2 CO3 , and KOH + K2 CO3 ). The ACs produced by the two-step method showed relatively smaller specific surface areas (∼90% micropores) and lower nitrogen contents. From the one-step method, the ACs had larger pore diameters with about 90% small mesopores (2-3...
February 7, 2019: Bioresource Technology
Roent Dune A Cayetano, Jong-Hun Park, Seoktae Kang, Sang-Hyoun Kim
The applicability of a dynamic membrane (DM) was examined in the anaerobic treatment of high-strength food waste. A DM was established on woven polyester with a pore size of 50 µm, which achieved a solids retention time to hydraulic retention time ratio of 2.1:12.1. The highest average rate of methane production (1.1 L CH4 /L/d) was achieved with an organic loading rate (OLR) of 5.0 g chemical oxygen demand (COD)/L/d. Propionate was the most abundant volatile fatty acid (VFA) for OLRs above 3.1 g/L/d, but concentrations were maintained below 0...
February 7, 2019: Bioresource Technology
Ming Li, Minghua Zhou, Jianmei Luo, Chaolin Tan, Xiaoyu Tian, Pei Su, Tingyue Gu
This study developed a bubbling-type photosynthetic algae microbial fuel cell (B-PAMFC) to treat synthetic wastewater and capture CO2 using Chlorella vulgaris with simultaneous power production. The performance of B-PAMFC in CO2 fixation and bioenergy production was compared with the photosynthetic algae microbial fuel cell (PAMFC) and bubbling photobioreactor. Different nitrogen sources for C. vulgaris growth, namely sodium nitrate, urea, ammonium acetate and acetamide were studied. The maximum CO2 fixation rate in B-PAMFC with 2...
February 7, 2019: Bioresource Technology
Thomas Kiran Marella, Aviraj Datta, Mukund D Patil, Sreenath Dixit, Archana Tiwari
The aim of this work was to study algal floway (AFW) to treat urban wastewater and to evaluate biomass productivity, lipid contents and biodiesel production. The results indicated the seasonal average algae productivity of 34.83 g dry weight m2  d-1 with a nutrient removal rate of 2.52 g m2  d-1 N and 1.25 g m2  d-1 P while the lipid content ranged between 14 and 22% of dry cell weight with the highest lipid productivity of 9.29 g m-2  d-1 during summer. Biodiesel quality was superior during summer with high centane number and cold filter plugging point values...
February 6, 2019: Bioresource Technology
David Marín, Antonio Ortíz, Rubén Díez-Montero, Enrica Uggetti, Joan García, Raquel Lebrero, Raúl Muñoz
The influence of the liquid-to-biogas ratio (L/G) and alkalinity on methane quality was evaluated in a 11.7 m3 outdoors horizontal semi-closed tubular photobioreactor interconnected to a 45-L absorption column (AC). CO2 concentrations in the upgraded methane ranged from <0.1 to 9.6% at L/G of 2.0 and 0.5, respectively, with maximum CH4 concentrations of 89.7% at a L/G of 1.0. Moreover, an enhanced CO2 removal (mediating a decrease in CO2 concentration from 9.6 to 1.2%) and therefore higher CH4 contents (increasing from 88...
February 6, 2019: Bioresource Technology
C Castro, M S Urbieta, J Plaza Cazón, E R Donati
Metal mobilization and immobilization catalyzed by microbial action are key processes in environmental biotechnology. Metal mobilization from ores, mining wastes, or solid residues can be used for recovering metals and/or remediating polluted environments; furthermore, immobilization reduces the migration of metals; cleans up effluents plus ground- and surface water; and, moreover, can help to concentrate and recover metals. Usually these processes provide certain advantages over traditional technologies such as more efficient economical and environmentally sustainable results...
February 6, 2019: Bioresource Technology
Mukesh Kumar Awasthi, Tao Liu, Hongyu Chen, Shivpal Verma, Yumin Duan, Sanjeev Kumar Awasthi, Quan Wang, Xiuna Ren, Junchao Zhao, Zengqiang Zhang
In this paper, the influence of clay amendment on antibiotic resistance genes (ARGs) fate and their relation with bacterial diversity in poultry manure (PM) composting was evaluated. The results confirmed that 4% clay amendment was significantly reduce the relative abundances (RAs) 94% of ARGs, while higher dosage of clay blended treatments (T5 and T6) composts were observed relatively very high percentage of ARGs as compared to other clay blended treatments. Clay addition play potential role on the occurrence and distribution of ARGs during the composting by altering the overall RAs of Firmicutes and Proteobacteria, and there host bacterial species...
February 6, 2019: Bioresource Technology
Hong Chen, Jiang Wu, Bing Liu, Yu-You Li, Hidenari Yasui
To reveal the long-term competitive dynamics of anaerobes in anaerobic bioreactors with sulfate reduction, a comprehensive structured mathematical model was designed for an extension of the Anaerobic Digestion Model No. 1 (ADM1). Sulfate reduction bacteria (SRB) were categorized into acetogenic-likewise SRB (ASRB) and methanogenic-likewise SRB (MSRB). Experimental data from 329 days of continuous operation of a laboratory-scale upflow anaerobic sludge bed (UASB) reactor was used for model calibration and validation...
February 5, 2019: Bioresource Technology
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