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Bioresource Technology

Yongteng Zhao, Dafei Li, Jun-Wei Xu, Peng Zhao, Tao Li, Huixian Ma, Xuya Yu
In this study, melatonin (MT) promoted lipid accumulation in Monoraphidium sp. QLY-1 under nitrogen deficiency conditions. The lipid accumulation increased 1.22- and 1.36-fold compared with a nitrogen-starved medium and a normal BG-11 medium, respectively. The maximum lipid content was 51.38%. The reactive oxygen species (ROS) level in the presence of melatonin was lower than that in the control group, likely because of the high antioxidant activities. The application of melatonin upregulated the gibberellin acid (GA) production and rbcL and accD expression levels but downregulated the abscisic acid (ABA) content and pepc expression levels...
March 13, 2018: Bioresource Technology
Saurabh Sudha Dhiman, Namita Shrestha, Aditi David, Neha Basotra, Glenn R Johnson, Bhupinder S Chadha, Venkataramana Gadhamshetty, Rajesh K Sani
Residual solid and liquid streams from the one-pot CRUDE (Conversion of Raw and Untreated Disposal into Ethanol) process were treated with two separate biochemical routes for renewable energy transformation. The solid residual stream was subjected to thermophilic anaerobic digestion (TAD), which produced 95 ± 7 L methane kg-1 volatile solid with an overall energy efficiency of 12.9 ± 1.7%. A methanotroph, Methyloferula sp., was deployed for oxidation of mixed TAD biogas into methanol. The residual liquid stream from CRUDE process was used in a Microbial Fuel Cell (MFC) to produce electricity...
March 12, 2018: Bioresource Technology
Amine Charfi, Eunyoung Park, Muhammad Aslam, Jeonghwan Kim
The study presents a mathematical model developed to better understand and control membrane fouling in a single-staged, anaerobic fluidized bed membrane bioreactor (AFMBR) using polyethylene terephthalate (PET) beads as scouring media. The model was based on combining the anaerobic biological model AM2b and a fouling model applied in membrane filtration. The presented model was validated using experimental data obtained by a laboratory scaled AFMBR reactor run during 250 d under various operational conditions...
March 10, 2018: Bioresource Technology
Elena Herweg, Marie Schöpping, Katja Rohr, Anna Siemen, Oliver Frank, Thomas Hofmann, Uwe Deppenmeier, Jochen Büchs
Sweeteners improve the dietary properties of many foods. A candidate for a new natural sweetener is 5-ketofructose. In this study a fed-batch process for the production of 5-ketofructose was developed. A Gluconobacter oxydans strain overexpressing a fructose dehydrogenase from G. japonicus was used and the sensory properties of 5-ketofructose were analyzed. The compound showed an identical sweet taste quality as fructose and a similar intrinsic sweet threshold concentration of 16.4 mmol/L. The production of 5-ketofructose was characterized online by monitoring of the respiration activity in shake flasks...
March 9, 2018: Bioresource Technology
Taissa Silva de Oliveira, Santo Fabio Corsino, Daniele Di Trapani, Michele Torregrossa, Gaspare Viviani
Excess sludge minimization was studied in a MBR with pre-denitrification scheme. Sludge minimization, nitrogen removal performance and membrane fouling tendency were investigated in two configurations, characterized by a different position of the sludge retention reactor (SRR). In particular, the SRR was placed: i) in the return activated sludge line (Anaerobic Side-Stream Reactor - ASSR configuration) and ii) in the mainstream between the anoxic and aerobic reactor (Anaerobic Main-Stream Reactor - AMSR configuration)...
March 9, 2018: Bioresource Technology
Zhongxue Dai, Huiyuan Zhou, Shangjie Zhang, Honglian Gu, Qiao Yang, Wenming Zhang, Weiliang Dong, Jiangfeng Ma, Yan Fang, Min Jiang, Fengxue Xin
Malic acid (2-hydroxybutanedioic acid) is a four-carbon dicarboxylic acid, which has attracted great interest due to its wide usage as a precursor of many industrially important chemicals in the food, chemicals, and pharmaceutical industries. Several mature routes for malic acid production have been developed, such as chemical synthesis, enzymatic conversion and biological fermentation. With depletion of fossil fuels and concerns regarding environmental issues, biological production of malic acid has attracted more attention, which mainly consists of three pathways, namely non-oxidative pathway, oxidative pathway and glyoxylate cycle...
March 9, 2018: Bioresource Technology
Li Jiang, Jianyong Liu, Kang Zuo, Lianpai Zou, Yu-You Li, Guangren Qian, Zhi Ping Xu
In situ synthesis of layered double hydroxides (LDHs) is an effective way to extract short chain fatty acids (SCFAs) from anaerobic fermentation liquid to be used as carbon source for biodenitrification, but the slow release performance need to be improved. Three layered double hydroxides with different metal cations (Mg-Al, Ni-Al, Ni-Fe) intercalated with acetate (Ac) were successfully prepared in the present study. The release rates decreased in the order of MgAl-LDH > NiAl-LDH > NiFe-LDH, meaning that NiFe-LDH-Ac showed the best slow release performance...
March 9, 2018: Bioresource Technology
Yan Lin, Zhihao Chen, Minquan Dai, Shiwen Fang, Yanfen Liao, Zhaosheng Yu, Xiaoqian Ma
In this study, the kinetic models of bagasse, sewage sludge and their mixture were established by the multiple normal distributed activation energy model. Blending with sewage sludge, the initial temperature declined from 437 K to 418 K. The pyrolytic species could be divided into five categories, including analogous hemicelluloses I, hemicelluloses II, cellulose, lignin and bio-char. In these species, the average activation energies and the deviations situated at reasonable ranges of 166.4673-323.7261 kJ/mol and 0...
March 8, 2018: Bioresource Technology
Qing Feng, Young-Chae Song, Yongtae Ahn
The role of anaerobic microorganisms suspended in the bulk solution on methane production was investigated in a bioelectrochemical anaerobic reactor with the electrode polarized at 0.5 V. The electron transfer from substrate to methane and hydrogen were 25% and 7.5%, respectively, in the absence of the anaerobic microorganisms in the bulk solution. As the anaerobic microorganisms increased to 4400 mg/L, the electrons transferred to methane increased to 83.3% but decreased to 0.3% in hydrogen. The electroactive microorganisms (EAM), including exoelectrogens and electrotrophs, enriched in the bulk solution that confirmed by the redox peaks in the cyclic voltammogram was proportional to the anaerobic microorganism...
March 8, 2018: Bioresource Technology
P Buffière, M Dooms, S Hattou, H Benbelkacem
The role of the hydrolytic stage in high solids temperature phased anaerobic digestion was investigated with a mixture of cattle slurry and maize silage with variable ratios (100, 70 and 30% volatile solids coming from cattle slurry). It was incubated for 48 h at 37, 55, 65 and 72 °C. Soluble chemical oxygen demand and biochemical methane potential were measured at 0, 24 and 48 h. Higher temperatures improved the amount of solubilized COD, which confirmed previously reported results. Nevertheless, solubilization mostly took place during the first 24 h...
March 8, 2018: Bioresource Technology
Péter Bakonyi, László Koók, Enikő Keller, Katalin Bélafi-Bakó, Tamás Rózsenberszki, Ganesh Dattatraya Saratale, Dinh Duc Nguyen, J Rajesh Banu, Nándor Nemestóthy
The purpose of this research was to improve microbial fuel cell (MFC) performance - treating landfill-derived waste liquor - by applying effluents of various biogas fermenters as inocula. It turned out that the differences of initial microbial community profiles notably influenced the efficiency of MFCs. In fact, the adaptation time (during 3 weeks of operation) has varied significantly, depending on the source of inoculum and accordingly, the obtainable cumulative energy yields were also greatly affected (65% enhancement in case of municipal wastewater sludge inoculum compared to sugar factory waste sludge inoculum)...
March 8, 2018: Bioresource Technology
Ahmed M Mustafa, Hui Li, Amira A Radwan, Kuichuan Sheng, Xiang Chen
The effect of hydrothermal (HTP) and Ca(OH)2 pretreatments on the biogas produced by the anaerobic digestion of sugarcane bagasse (SCB) was studied. HTP, Ca(OH)2 and combination pretreatment had significant effects on hemicellulose and lignin degradation during pretreatment and methane yield through digestion. The highest biogas production observed in combination pretreatment HTP 180 + 8.5% of SCB reached 318 mL/g Volatile Solids (VS), which were 47% higher than the untreated SCB, with the highest methane content 69% and highest lignin degradation 44%...
March 8, 2018: Bioresource Technology
Lijian Leng, Songqi Leng, Jie Chen, Xingzhong Yuan, Jun Li, Kun Li, Yunpu Wang, Wenguang Zhou
Co-liquefaction of municipal sewage sludge (MSS) and heavy metal (HM) contaminated lignocellulosic biomass (rice straw or wood sawdust) was conducted at 300 °C with ethanol as the solvent to study the transformation behavior of HMs (e.g., Cu, Cd, Pb, Cr, Zn, and Ni). The results indicate that HMs in rice straw or wood sawdust transferred heavily to bio-oils (up to 10-25% of the total Cu, Cd, and Zn) when they were liquefied individually, compared with MSS with only ∼5% distributed to bio-oil. The bio-available fraction of HMs in bio-chars and bio-oils produced from liquefaction of individual biomass were assessed to show medium to high risk to the environment...
March 7, 2018: Bioresource Technology
Yuepeng Sun, Yuntao Guan, Dan Wang, Kai Liang, Guangxue Wu
Two lab-scale nitrifying sequencing batch biofilm reactors, with (SBBR_CN) or without the addition of organics (SBBR_N), were operated to investigate potential roles of acyl homoserine lactone (AHL) based quorum sensing. AHLs of N-[(RS)-3-Hydroxybutyryl]-L-homoserine lactone, N-hexanoyl-L-homoserine lactone (C6 -HSL) and N-octanoyl-L-homoserine lactone (C8 -HSL) were detected in both reactors. C6 -HSL and C8 -HSL were also detected in batch experiments, especially with stimulated nitrite oxidizing bacteria activities...
March 7, 2018: Bioresource Technology
Majid Bagheri, Sayed Ahmad Mirbagheri
The current research was an effort to critically review all approaches used for membrane fouling control in the membrane bioreactors treating water and wastewater. The first generation of antifouling methods tried to optimize operational conditions, or used chemical agents to control membrane fouling. Despite their positive impacts on the fouling mitigation, these methods did not provide a sustainable solution for the problem. Moreover, chemical agents may affect microorganisms in bioreactors and has some environmental drawbacks...
March 7, 2018: Bioresource Technology
Lili Wang, Ke Zhang, Youjie Xu, Meng Zhang, Donghai Wang
The aim of this research was to study a high-solid pretreatment of corn stover using urea. Effects of solid loading (30-70%), temperature (60-80 °C), time (2-14 d), ratio of urea to corn stover (1:10-1:1), and ratio of soybean flour to corn stover (1:40-1:10) on enzymatic saccharification were investigated. Generally, the glucose and xylose yield increased as the reaction temperature, time, and ratio of urea to corn stover increased. Urea enhanced enzymatic saccharification at a relatively high-solid loading and low temperature...
March 7, 2018: Bioresource Technology
Honglei Zhang, Qingxi Hou, Wei Liu, Zhen Yue, Xiaoya Jiang, Xixi Ma
This work investigated the changes in the physical structure of autohydrolyzed poplar sapwood chips and the effect on the subsequent alkali liquor diffusion properties for chemi-mechanical pulping (CMP). An alkali impregnation process was conducted by using the autohydrolyzed poplar sapwood with different levels of autohydrolysis intensity. The results showed that the volume porosity, water constraint capacity, and saturated water absorption of the autohydrolyzed poplar sapwood chips increased. Also, the effective capillary cross-sectional area (ECCSA) in the radial direction and the diffusion coefficients of NaOH solution in both the radial and axial directions all increased...
March 7, 2018: Bioresource Technology
Kui Huang, Hui Xia, Ying Wu, Jingyang Chen, Guangyu Cui, Fusheng Li, Yongzhi Chen, Nan Wu
Diverse antibiotic resistance genes (ARGs) present in sewage sludge are difficult to be eliminated using conventional sludge treatment processes. To date, little remains known on the fate of the ARGs during vermicomposting of sludge. This study aimed to investigate the effect of earthworms on the fate of tetracycline and fluoroquinolone resistance genes, and integrons during vermicomposting of sewage sludge through contrasting two systems of sludge stabilization with and without earthworms. Compared to the control without earthworms, vermicomposting significantly (p < 0...
March 7, 2018: Bioresource Technology
Zheng-Zhe Zhang, Ya-Fei Cheng, Lian-Zeng-Ji Xu, Yu-Hui Bai, Ren-Cun Jin
The increasing use of engineered Ag nanoparticles (NPs) in consumer products raises great concerns about their environmental impacts, but their potential impact on anaerobic ammonium oxidation (anammox) bacteria in wastewater treatment remains unclear. In this study, the response of anammox consortia inhabiting in granules to long-term exposure of AgNPs was investigated. The gradually increased stress of AgNPs (1, 10, 50 mg L-1 ) showed no adverse effects on the nitrogen removal performance and on the relative abundance of Ca...
March 7, 2018: Bioresource Technology
Caihong Song, Mingxiao Li, Hui Qi, Yali Zhang, Dongming Liu, Xunfeng Xia, Hongwei Pan, Beidou Xi
This study investigated the effect of anti-acidification microbial consortium (AAMC), which act synergistically for rapid bioconversion of organic acids on carbohydrate metabolism of key microbes in the course of food waste (FW) composting by metaproteomics. AAMC was inoculated to the composting mass and compared with treatment with alkaline compounds and the control without any amendment. Inoculating AAMC could effectively accelerate carbohydrate degradation process and improve composting efficiency. Carbohydrate metabolic network profiles showed the inoculation with AAMC could increase significantly the types of enzymes catalysing the degradation of lignin, cellulose and hemicellulose...
March 7, 2018: Bioresource Technology
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