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Bioresource Technology

Ruo-Hong Li, Xiao-Yan Li
A sequencing batch reactor-based system was developed for enhanced phosphorus (P) removal and recovery from municipal wastewater. The system consists of an iron-dosing SBR for P precipitation and a side-stream anaerobic reactor for sludge co-fermentation with food waste. During co-fermentation, sludge and food waste undergo acidogenesis, releasing phosphates under acidic conditions and producing volatile fatty acids (VFAs) into the supernatant. A few types of typical food waste were investigated for their effectiveness in acidogenesis and related enzymatic activities...
September 11, 2017: Bioresource Technology
Caixia Cui, Zhe Zhang, Biqiang Chen
Glycerol waste from the biodiesel production can be used as a carbon source in the production of 1,3-propanediol (1,3-PD) through microbial fermentation. However, downstream processing is a major bottleneck that restricts its biological production. Here, we investigated an environmentally-friendly method to enzymatically separate 1,3-PD. The transformation of 1,3-PD to an ester was achieved by exploiting the esterification reaction with fatty acids under lipase catalysis. The reaction efficiency was optimized using different poly-alcohols that were existed in the fermentation broth reacted with a fatty acid...
September 9, 2017: Bioresource Technology
Kyung-Won Jung, Soonjae Lee, Young Jae Lee
In this work, magnesium ferrite (MgFe2O4)/biochar magnetic composites (MFB-MCs) were prepared and utilized to remove phosphate from aqueous solutions. MFB-MCs were synthesized via co-precipitation of Fe and Mg ions onto a precursor, followed by pyrolysis. Characterization results confirmed that MgFe2O4 nanoparticles with a cubic spinel structure were successfully embedded in the biochar matrix, and this offered magnetic separability with superparamagnetic behavior and enabled higher phosphate adsorption performance than that of pristine biochar and sole MgFe2O4 nanoparticles...
September 8, 2017: Bioresource Technology
Kwang-Hwa Jeong, Jung Kon Kim, Balsubramani Ravindran, Dong Jun Lee, Jonathan Woon-Chung Wong, Ammaiyappan Selvam, Obuli P Karthikeyan, Jung-Hoon Kwag
The study investigated the effect of in-vessel composting process on Hanwoo manure in two different South Korea regions (Pyeongchang and Goechang) with sawdust using vertical cylindrical in-vessel bioreactor for 42days. The stability and quality of Hanwoo manure in both regions were improved and confirmed through the positive changes in physico-chemical and phytotoxic properties using different commercial seed crops. The pH and electrical conductivity (EC, ds/m) of composted manure in both regions were slightly increased...
September 8, 2017: Bioresource Technology
Cheng-Di Dong, Chiu-Wen Chen, Chang-Mao Hung
This study developed a new and cost-effective method for the remediation of marine sediments contaminated with PAHs. Fe3O4 particles were synthesized as the active component, supported on bamboo biochar (BB) to form a composite catalyst (Fe3O4-BB). The effects of critical parameters, including the initial pH, sodium persulfate (PS) concentration, and dose of catalyst were investigated. The concentration of high-molecular-weight PAHs in sediments was much higher than that of low-molecular-weight PAHs; pyrene was an especially prominent marker of PAH contamination in sediments...
September 8, 2017: Bioresource Technology
Carolina Zampol Lazaro, Zeynep Yilmazer Hitit, Patrick C Hallenbeck
Hydrogen yields of dark fermentation are limited due to the need to also produce reduced side products, and photofermentation, an alternative, is limited by the need for light. A relatively new strategy, dark microaerobic fermentation, could potentially overcome both these constraints. Here, application of this strategy demonstrated for the first time significant hydrogen production from lactate by a single organism in the dark. Response surface methodology (RSM) was used to optimize substrate and oxygen concentration as well as inoculum using both (1) regular batch and (2) O2 fed batch cultures...
September 8, 2017: Bioresource Technology
Sang Cheol Lee
A cost-effective five-step sugar purification process involving simultaneous removal and recovery of fermentation inhibitors from biomass hydrolysates was first proposed here. Only the three separation steps (PB, PC and PD) in the process were investigated here. Furfural was selectively removed up to 98.4% from a simulated five-component hydrolysate in a cross-current three-stage extraction system with n-hexane. Most of acetic acid in a simulated four-component hydrolysate was selectively removed by emulsion liquid membrane, and it could be concentrated in the stripping solution up to 4...
September 8, 2017: Bioresource Technology
Chunli Zheng, Qiaorui Wang, Yanli Ning, Yurui Fan, Shanshan Feng, Chi He, Tian C Zhang, Zhenxing Shen
Burkholderia sp. ZD1, aerobically utilizes 2-picolinic acid as a source of carbon, nitrogen and energy, was isolated. ZD1 completely degraded 2-picolinic acid when the initial concentrations ranged from 25 to 300mg/L. Specific growth rate (μ) and specific consumption rate (q) increased continually in the concentration range of 25-100mg/L, and then declined. Based on the Haldane model and Andrew's model, μmax and qmax were calculated as 3.9 and 16.5h(-1), respectively. Fourier transform ion cyclotron resonance mass spectrometry (FT-ICR-MS) was used to determine the main intermediates in the degradation pathway...
September 6, 2017: Bioresource Technology
Shanshan Li, Shijiang Gao, Sen Wang, Bingrui Ma, Liang Guo, Zhiwei Li, Qiaoyan Xu, Zonglian She, Mengchun Gao, Yangguo Zhao, Feng Gao, Chunji Jin
The performance, microbial community and enzymatic activity of a sequencing batch reactor (SBR) were evaluated at different silica nanoparticles (SiO2 NPs) concentrations. SiO2 NPs concentration at 5-30mg/L had a slight inhibitory impact on the nitrogen and COD removals, whereas the phosphorus removal was obviously inhibited at 30mg/L SiO2 NPs. The rates of nitrification, nitrite reduction and phosphorus removal decreased with the increase of SiO2 NPs concentration. The nitrate reduction rate decreased at less than 5mg/L SiO2 NPs and subsequently showed an increase at 10-30mg/L SiO2 NPs...
September 6, 2017: Bioresource Technology
Juliana Vasco-Correa, Sami Khanal, Ashish Manandhar, Ajay Shah
Anaerobic digestion (AD) is a mature technology that can transform organic matter into a bioenergy source - biogas (composed mainly of methane and carbon dioxide), while stabilizing waste. AD implementation around the world varies significantly, from small-scale household digesters in developing countries to large farm-scale or centralized digesters in developed countries. These differences in the implementation of AD technology are due to a complex set of conditions, including economic and environmental implications of the AD technology, and stimulus provided by a variety of polices and incentives related to agricultural systems, waste management, and renewable energy production...
September 5, 2017: Bioresource Technology
W Laperrière, B Barry, M Torrijos, B Pechiné, N Bernet, J P Steyer
The aim of the presented work was to study the methane production limits and to determine optimal conditions for flexible operation of an anaerobic reactor in order to set up an operational strategy. Punctual overloads were conducted in a laboratory-scale anaerobic reactor with readily biodegradable solid substrates, and the influences of overload intensity, baseload value and substrate used were investigated. A maximal daily value around 1000mL/L of reactor for methane production has been assessed. This value did not evolve significantly during experiment time, and conditioned the persistence of overloads as well as the flexibility margin on the reactor, which ranged from +25% to +140% on daily production...
September 5, 2017: Bioresource Technology
Joonyeob Lee, Seung Gu Shin, Gyuseong Han, Taewoan Koo, Seokhwan Hwang
In this study, four different mesophilic and thermophilic full-scale anaerobic digesters treating food wastewater (FWW) were monitored for 1-2years in order to investigate: 1) microbial communities underpinning anaerobic digestion of FWW, 2) significant factors shaping microbial community structures, and 3) potential microbial indicators of process instability. Twenty-seven bacterial genera were identified as abundant bacteria underpinning the anaerobic digestion of FWW. Methanosaeta harundinacea, M. concilii, Methanoculleus bourgensis, M...
September 5, 2017: Bioresource Technology
Mukesh Kumar Awasthi, Ammaiyappan Selvam, Ka Man Lai, Jonathan W C Wong
Effect of single-function (oil degrading) and multi-functional bacterial consortium with zeolite as additive for post-consumption food waste (PCFW) composting was investigated through assessing the oil content reduction in a computer controlled 20-L composter. Three treatments of PCFWs combined with 10% zeolite were developed: Treatment-2 and Treatment-3 were inoculated with multi-functional (BC-1) and oil degrading bacterial consortium (BC-2), respectively, while T-1 was without bacterial inoculation and served as control...
September 5, 2017: Bioresource Technology
Daikun Li, Qing Li, Daoyong Mao, Ningning Bai, Hongzhou Dong
Developing versatile materials for effective water purification is significant for environment and water source protection. Herein, a versatile bio-based material (CH-PAA-T) was reported by simple thermal cross-linking chitosan and polyacrylic acid which exhibits excellent performances for removing insoluble oil, soluble toxic dyes and heavy metal ions from water, simultaneously. The adsorption capacities are 990.1mgg(-1) for methylene blue (MB) and 135.9mgg(-1) for Cu(2+), which are higher than most of present advanced absorbents...
September 5, 2017: Bioresource Technology
Laura André, André Pauss, Thierry Ribeiro
In this paper, a state-of-art about solid anaerobic digestion (AD), focused on recent progress and trends of research is proposed. Solid anaerobic digestion should be the most appropriate process for degradation of by-products with high total solid (TS) content, especially lignocellulosic materials like agricultural waste (straw, manure), household waste and food waste. Solid AD is already widely used in waste water treatment plant for treating plant for sewage sludge but could be more developed for lignocellulosic materials with high TS content...
September 5, 2017: Bioresource Technology
Parthiban Anburajan, Arivalagan Pugazhendhi, Jong-Hun Park, Periyasamy Sivagurunathan, Gopalakrishnan Kumar, Sang-Hyoun Kim
This study investigated the effect of 5-hydroxymethylfurfural (5-HMF) on high-rate continuous fermentative H2 production in a lab-scale fixed bed reactor (FBR) inoculated with mixed culture granules and fed with 15g/L galactose at a hydraulic retention time of 6h and at 37°C. During the 83days of operation, 5-HMF up to 2.4g/L was spiked into the feedstock. The maximum hydrogen production performance of 26.6L/L-d and 2.9mol H2/mol galactoseadded were achieved at 5-HMF concentration of 0.6g/L. 5-HMF concentration exceeding 0...
September 5, 2017: Bioresource Technology
Jian Ding, Hongzhen Luo, Fang Xie, Hao Wang, Meng Xu, Zhongping Shi
The techniques for enhancing butanol production in ABE fermentation by Clostridium acetobutylicum generally focus on adding electron carrier to strengthen NADH synthesis, repressing hydrogenase by aerating CO, supplementing butyrate, etc. However, those methods suffer from the problems of total solvent decrease, high purification cost, using expensive supplemental substances, etc. In this study, we added small amount of electron receptors (Na2SO4/CaSO4, 2g/L) into ABE fermentation broth: to alter electron/proton distributions in the intracellular electron transport shuttle system, directing more electron/proton pairs into NADH synthesis route; to stimulate intracellular accumulation of those amino acids favorable for cells survival/butanol synthesis...
September 5, 2017: Bioresource Technology
Xueyang Zhang, Bin Gao, Yulin Zheng, Xin Hu, Anne Elise Creamer, Michael D Annable, Yuncong Li
Sorption is one of the most efficient and low cost strategies for volatile organic compound (VOC) removal, but VOC sorption by biochar has seen limited research. In this work, gas phase sorption experiments were conducted to determine the sorption potential and mechanisms of VOCs onto biochar. A total of 15 biochars produced from 5 common feedstocks at 300, 450, and 600°C were evaluated as sorbents. Three common VOCs (acetone, cyclohexane, and toluene) were chosen as sorbates. The results showed that all the tested biochars had VOC sorption capacity in the range of 5...
September 5, 2017: Bioresource Technology
Moonkyung Kim, Byung-Chul Kim, Yongju Choi, Kyoungphile Nam
The aim of this work was to study the effect of the differential development of microbe-substrate aggregates at different mixing intensities on the performance of anaerobic digestion of rice straw. Batch and semi-continuous reactors were operated for up to 50 and 300days, respectively, under different mixing intensities. In both batch and semi-continuous reactors, minimal mixing conditions exhibited maximum methane production and lignocellulose biodegradability, which both had strong correlations with the development of microbe-substrate aggregates...
September 5, 2017: Bioresource Technology
Tsuyoshi Tanaka, Takashi Yabuuchi, Yoshiaki Maeda, Daisuke Nojima, Mitsufumi Matsumoto, Tomoko Yoshino
Polyunsaturated fatty acids (PUFAs), including eicosapentaenoic acid (EPA), have attracted attention owing to their health benefits for humans, as well as their importance in aquaculture and animal husbandry. Establishing a sustainable PUFA supply based on fish oils has been difficult due to their increasing demand. Therefore, alternative sources of PUFAs are required. In this research, we examined the potential of the marine oleaginous diatom Fistulifera solaris as an alternative producer of PUFAs. Optimization of culture conditions was carried out for high cell density cultivation, and a maximal biomass productivity of 1...
September 5, 2017: Bioresource Technology
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