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Bioresource Technology

Jae Hac Ko, Ning Wang, Tugui Yuan, Fan Lü, Pinjing He, Qiyong Xu
Anaerobic digestion (AD) is frequently restricted with the long lag phase and low methane (CH4 ) production rate. Laboratory batch experiments were conducted to investigate the impact of different supplements on the performance of food waste AD, including AC-Ni, AC, and Ni. Results showed that the lag phase of AD was reduced with the addition of those supplementations. Compared with the control group without any supplementation, the AC-Ni could shorten the lag phase by 67% and increase the maximum CH4 production rate by 50%, respectively...
July 6, 2018: Bioresource Technology
Chaofan Zheng, Huaili Zheng, Yongjuan Wang, Yili Wang, Wenqi Qu, Qiang An, Yongzhi Liu
Novel adsorbents, poly([2-(methacryloxy)ethyl]trimethylammonium chloride) modified magnetic chitosan particles (DMCPs), were synthesized via free radical polymerization and applied to adsorb Cr(VI) from aqueous solution. The effects of pH (2-11), Cr(VI) concentration (10-200 mg/L) and contact time (0-420 min) on the adsorption performance were evaluated. The results showed that the adsorption capacity of DMCPs was much larger than that of magnetic chitosan particles (MCPs) in the examined pH range and decreased with Cl- concentration increasing, indicating that electrostatic interaction and ion exchange are the governing mechanisms of Cr(VI) adsorption by DMCPs...
July 6, 2018: Bioresource Technology
Eko K Sitepu, Kendall Corbin, Xuan Luo, Scott J Pye, Youhong Tang, Sophie C Leterme, Kirsten Heimann, Colin L Raston, Wei Zhang
A bottleneck in the production of biodiesel from microalgae is the dewatering and lipid extraction process which is the dominant energy penalty and cost. A novel biodiesel production platform based on vortex fluidic device (VFD)-assisted direct transesterification (DT) of wet microalgal biomass of Chloroparva pannonica was developed and evaluated. Fatty acid extraction and fatty acid to FAME conversion efficiencies were used at different parameter settings to evaluate performance of the processing technology in confined and continuous mode...
July 5, 2018: Bioresource Technology
Jia Yan, Weizhuo Ye, Zhuoyi Jian, Jiehui Xie, Kengqiang Zhong, Siji Wang, Haoshen Hu, Zixuan Chen, Huijun Wen, Hongguo Zhang
Graphene oxide (GO) was introduced to Enterococcus avium strain BY7 sulfate-reducing bacteria culture as a carrier, GO was partially reduced by SRB to reduced graphene oxide (rGO). The rGO could further self-assemble Enterococcus avium strain BY7 sulfate-reducing bacteria to form BY-rGO particles. Growth and sulfate reduction activity of strain BY7 was promoted by rGO, which probably due to the protective effect of rGO, and enhanced electron transfer by rGO as electron shuttle. Effects of pH and temperature variance on strain BY-rGO were remarkably weakened, growth and sulfate reduction were observed from pH 2...
July 5, 2018: Bioresource Technology
Zheng-Zhe Zhang, Ya-Fei Cheng, Lian-Zeng-Ji Xu, Jing Wu, Yu-Hui Bai, Jia-Jia Xu, Zhi-Jian Shi, Ren-Cun Jin
Metal and metal oxide nanoparticles (NPs) show differences in antimicrobial activity due to different chemical and physical properties. Using copper as a representative example, this study compared the NP effects on anaerobic ammonium oxidation (anammox) bacteria in wastewater treatment. Long-term exposure to 5 mgCu L-1 CuNPs reduced the physiological activity and abundance of anammox bacteria, thereby causing deterioration of reactor performance. However, anammox granules exhibited stronger resistance and resilience to perturbation by 1-160 mgCu L-1 CuONPs, and no adverse effects on performance were observed...
July 4, 2018: Bioresource Technology
Xiaoyan Liu, Xinjun Yu, Tong Zhang, Zhipeng Wang, Jiaxing Xu, Jun Xia, Aiyong He, Yubo Yan, Jiming Xu
An economical model of two-stage solid state fermentation (SSF) (prefermentation stage with Mucor flavus and in situ erythritol fermentation stage with Yarrowia lipolytica) for enhancing erythritol production was investigated. Buckwheat husk (BH) was utilized as inert support for the first time and okara as the substrate. Morphological properties suggested yeast cells were exposed in adequate oxygen leading to high erythritol yield, and enzyme activities analysis indicated M. flavus and Y. lipolytica grew and cooperated well during the two ferment stages...
July 4, 2018: Bioresource Technology
Linee Goswami, Rupak Mukhopadhyay, Satya Sundar Bhattacharya, Pallabi Das, Rinku Goswami
Chromium-rich tannery sludge (TS) is a hazardous industrial waste. Although vermicomposting can be an effective remediation pathway; but, the unique waste degrading efficiency of Eudrillus eugeniae is least explored. The present work showcases an efficient earthworm-mediated protocol for TS sanitization deploying E. eugeniae. Changes in pH, TOC (%), nutrients (NPK), metals (Cr, Cd etc.) and microbial diversity were monitored in various E. eugeniae mediated TS based vermibed. Total N, P, and K availability increased by 2-5 folds upon vermicomposting with 3-4 folds reduction in C/N ratio...
July 4, 2018: Bioresource Technology
Guang Yang, Jianlong Wang
This paper investigated the improving mechanisms and microbial community dynamics of using zero-valent iron nanoparticles (Fe0 NPs) in hydrogen fermentation of grass. Results showed that Fe0 NPs supplement improved microbial activity and changed dominant microbial communities from Enterobacter sp. to Clostridium sp., which induced a more efficient metabolic pathway towards higher hydrogen production. Meanwhile, it is also proposed that Fe0 NPs could accelerate electron transfer between ferredoxin and hydrogenase, and promote the activity of key enzymes by the released Fe2+ ...
July 4, 2018: Bioresource Technology
Xiaofei Wu, Yuxin Ba, Xin Wang, Mingjie Niu, Kai Fang
Slow pyrolysis of bamboo is an important conversion pathway to produce biofuels and chemicals such as biomass-derived fertilizer precursor (biochar). In this study, evolved gas analysis during pyrolysis of bamboo was conducted by a combination of TG, FTIR and GC-MS to establish a detailed pyrolysis mechanism of bamboo biomass. The main decomposition temperature zones were 300-400 °C and it reached the maximum mass loss intensity at 350 °C based on DTG curves. The main functional groups escaped from biomass during pyrolysis were -OH, -CH2 , -CH3 , CO, C-O, and -COOH...
July 4, 2018: Bioresource Technology
Kun Zhao, Yeqing Li, Ying Zhou, Wenyang Guo, Hao Jiang, Quan Xu
To optimize the energy yield (EY) of food waste (FW) via hydrothermal carbonization (HTC), a response surface method was applied. Hydrochars and spent liquor were further conducted to evaluate their characterization and anaerobic digestion potential. Results found that optimal parameters for HTC of FW were suggested as temperature of 260 °C, reaction time of 4 h and moisture of 80%, with higher EY of 66.1%. Higher heating value, good combustion quality, lower H/C and O/C ratios indicated that hydrochar could be utilized as a safe solid fuel...
July 3, 2018: Bioresource Technology
Feng-Wei Yin, Dong-Sheng Guo, Lu-Jing Ren, Xiao-Jun Ji, He Huang
Fermentation wastewater (FW) and algal residue are major by-products of docosahexaenoic acid (DHA) fermentations utilizing Schizochytrium sp. In order to reduce production costs and environmental pollution, we explored the application of FW and algal-residue extract (AE) for DHA production. Components analysis showed that FW and AE contained some mineral elements and protein residues, respectively. When they were used for DHA fermentation, results showed that 20% replacement of fresh water by FW and 80% replacement of yeast extract nitrogen by AE reached DHA content of 22...
July 2, 2018: Bioresource Technology
Maria Sarno, Mariagrazia Iuliano
Physical adsorption preserving activity and support reusability was used to directly bond lipase from Thermomyces lanuginosus on citric acid (CA) modified Fe3 O4 /Au magnetic nanoparticles. A new faster approach has been used for CA ligand exchange, which ensures an high payload of stable enzyme. The immobilized lipase was tested for the biodiesel production from spent coffee ground in a solvent free system. It retains, after 60 days, more than 90% of its initial activity. Biodiesel yield of 51.7%, after 3 h of synthesis, which increases up to ∼100% after 24 h indicating an enzymatic fast kinetic, was measured...
July 2, 2018: Bioresource Technology
Sijie Liu, Zeying Lin, Zhenping Cai, Jinxing Long, Zhangmin Li, Xuehui Li
An efficient emulsion microreactor was constructed for selective conversion of lignosulfonate via hydrogen transfer reaction based on the self-surfactivity of this natural aromatic polymer. Industrial Raney Ni and isopropanol were used as catalyst and hydrogen donor, respectively. The results showed that the emulsion microreactor has a remarkable process intensification effect on the lignosulfonate depolymerization. Under mild condition of 473 K for 2.0 h, 116.1 mg g-1 of volatile phenolic monomer can be obtained, which is twice of that from other investigated processes without emulsion of this work...
July 2, 2018: Bioresource Technology
Jianli Huang, Jingyong Liu, Jiacong Chen, Wuming Xie, Jiahong Kuo, Xingwen Lu, Kenlin Chang, Shaoting Wen, Guang Sun, Haiming Cai, Musa Buyukada, Fatih Evrendilek
The present study systematically investigated the combustion characteristics of spent mushroom substrate (SMS) using TG-MS (thermogravimetric/mass spectrometry) and TG-FTIR (thermogravimetric/Fourier transform infrared spectrometry) under five heating rates. The physicochemical characteristics and combustion index pointed to SMS as a promising biofuel for power generation. The high correlation coefficient of the fitting plots and similar activation energy calculated by various methods indicated that four suitable iso-conversional methods were used...
July 2, 2018: Bioresource Technology
Najam Ul Saqib, Saeid Baroutian, Ajit K Sarmah
A solid carbon-rich product hydrochar, was prepared using hydrothermal carbonisation of food waste at temperatures of 200, 250 and 300 °C. To acquire detailed insight into physicochemical and structural properties, hydrochar samples were characterised using a range of techniques. The carbon content and higher heating value of food waste increased considerably from 39 to 73% and 15 to 31 MJ/kg corresponding to the heating temperature. The blends of hydrochar and coal prepared in three different ratios (5%, 10% and 15%) exhibited different thermal behaviour...
July 2, 2018: Bioresource Technology
Yongteng Zhao, Chenchen Yue, Wei Ding, Tao Li, Jun-Wei Xu, Peng Zhao, Huixian Ma, Xuya Yu
The aim of this study was to investigate the effects of butylated hydroxytoluene (BHT) on the production of astaxanthin and lipids in Haematococcus pluvialis LUGU under high-light and nitrogen-deficiency conditions. Astaxanthin and lipid contents were increased by 71.13% and 10.71%, respectively, in algal cells treated with 2 mg L-1 BHT. The maximal contents of astaxanthin and lipids were 3.17% and 46%, respectively. The levels of reactive oxygen species (ROS) in the presence of BHT were lower than in the control, and this effect involved strong activation of several antioxidases...
July 2, 2018: Bioresource Technology
Luigi di Bitonto, Georgia Antonopoulou, Camilla Braguglia, Claudia Campanale, Agata Gallipoli, Gerasimos Lyberatos, Ioanna Ntaikou, Carlo Pastore
A combined Lewis-Brønsted acid ethanolysis of sugars was thoroughly investigated with the aim of producing ethyl levulinate (EL) in a single step. Ethanolysis carried out at 453 K for 4 h using H2 SO4 (1 wt%) and AlCl3 ·6H2 O (30 mol % with respect to sugars) produced a yield of 60 mol % of EL respect to glucose and starch. Such optimised conditions were positively applied directly on different food waste, preliminarily characterised and found to be mainly composed by simple (10-15%) and relatively complex sugars (20-60%), besides proteins (6-10%) and lipids (4-10%), even in their wet form...
July 2, 2018: Bioresource Technology
Lin Yang, Lan Wang, Haiyang Zhang, Cheng Li, Xuezhi Zhang, Qiang Hu
In this study, a novel low cost and sustainable microalgal harvesting technique was developed using the concept of coagulant recovery concentration and recycling. Al3+ can be recovered from harvested Scenedesmus acuminatus biomass with 0.1 M HCl, at an acid solution-biomass ratio of 250 ml g-1 . The residual Al3+ content in the purified biomass was reduced to 0.11 ± 0.0006 mg g-1 , while a higher content of 59.74 ± 3.11 mg g-1 was found in the coagulation harvested biomass. The recovered Al3+ solution was concentrated 25 times and then reused for the harvesting of S...
July 1, 2018: Bioresource Technology
Qing Dong, Huaju Li, Miaomiao Niu, Chuping Luo, Jinfeng Zhang, Bo Qi, Xiangqian Li, Wa Zhong
Microwave pyrolysis of moso bamboo over bamboo-based biochar catalyst was conducted to achieve the bio-oil upgrading and high quality syngas production. The influence of the biochar on bamboo pyrolysis involving the temperature rise, product yield, and bio-oil and gas compositions was studied. The gas production was facilitated by the biochar mainly at the cost of the bio-oil, indicating the biochar had an excellent activity for the bio-oil cracking. The main compositions in bio-oil were acetic acid and phenol with the total contents ranging from 73...
July 1, 2018: Bioresource Technology
Joana Dias, Mel Bellingham, Junaid Hassan, Mark Barrett, Tom Stephenson, Ana Soares
Five carrier media with different shapes (spherical and cylindrical), sizes, voidage and protected surface areas (112-610 m2 /m3 ) were studied in a pilot scale moving bed biofilm reactor (MBBR). This study aimed at assessing start-up duration using biofilm formation rates. Results indicated that the spherical media required shorter periods to achieve stable biofilm formation rates associated with chemical oxygen demand (COD) (15-17 days), compared to cylindrical high surface area media (23-24 days). Protected surface area presented weaker correlations with the biofilm formation rate for COD (R2  = 0...
June 30, 2018: Bioresource Technology
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