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Bioresource Technology

Xiaoou Wang, Yimei Tian, Hong Liu, Xinhua Zhao, Qing Wu
Given that the relationship between the influent C/N (generally referred to as COD/TN) ratio and nitrogen removal has not been well understood in integrated constructed wetland-microbial fuel cell (CW-MFC) systems, this study aimed to investigate the effects of COD/TN ratio on nitrogen removal in CW-MFCs. Results showed that the MFC could reduce the dependence of denitrification on organic carbon sources in CWs, and influent COD/TN ratios ≥3 could result in a TN removal of 90.30-91.46% in CW-MFCs. Moreover, the MFC could significantly enhance TN removal by 4...
September 8, 2018: Bioresource Technology
Jiayang Liu, Changwei Hu, Qingguo Huang
Agro-processing waste oiltea shell (OTS) has been previously proven effective in removing dye from water by adsorption. This study further evaluated its capability to adsorb heavy metals in aqueous solution. Adsorbent dosage, pH, ion concentration, temperature, and contact time were investigated in batch experiments. Pseudo-second order kinetic better described the adsorption process for the three ions. Langmuir equation was more suitable for Cu2+ and Cd2+ , while Freundlich for Pb2+ . The maximum adsorption capacity was 22...
September 8, 2018: Bioresource Technology
Xiao-Fei Wu, Qian Zhou, Ming-Fei Li, Shu-Xian Li, Jing Bian, Feng Peng
Subcritical hydrothermal liquefaction of poplar was performed at 220-280 °C, and the liquid phase produced was extracted by ethyl acetate to obtain light oil (LO), which contained LO1 (water-soluble) and LO2 (ethyl acetate-soluble). The residue was further extracted with acetone to produce heavy oil (HO) and solid residue (SR). The highest bio-oil yield of 19.88% was obtained at 260 °C. The HO produced at 260 °C had the highest content of C (69.13%) and the higher heating value was 27.97 MJ/kg. The O/C and H/C ratios of LO were higher than those of HO due to less aromatics in LO...
September 8, 2018: Bioresource Technology
Dayanand Sharma, Kunwar D Yadav, Sunil Kumar
Flower waste (FW) is disposed off in the rivers or mixed with solid waste for landfilling that pollutes the environment and causes harmful effects on human health and aquatic life. It is rich in nutrient content and easily converted into the compost. Therefore, the objective of the present research was to optimize the combinations of flower waste and cow dung during agitated pile composting using response surface methodology. Thirteen different agitated piles were used for composting using the central composite design...
September 8, 2018: Bioresource Technology
Sunwen Xia, Haoyu Xiao, Ming Liu, Yingquan Chen, Haiping Yang, Hanping Chen
The pyrolysis behavior of Chinese chestnut and Jatropha curcas shells (CNS and JCS, respectively) were investigated to determine the optimum operating temperature for biomass pyrolytic polygeneration systems. At low temperatures (250-450 °C), CO2 was the main component of the pyrolytic gas, and high acidity oil was obtained. When the temperature increased to 550-650 °C, phenol-enriched oil and high LHV biochar (∼26 MJ/kg) were obtained; H2 and CO yields increased. At high temperatures (750-950 °C), heavy-oil and high LHV pyrolytic gas (∼15 MJ/m3 ) were obtained...
September 8, 2018: Bioresource Technology
Kai Feng, Huan Li, Chengzhi Zheng
Anaerobic fermentation is widely used to recover different products from food waste, and in this study, the evolution of fermentation products and microbial community along with pH variation was investigated thoroughly using four long-term reactors. Lactic fermentation dominated the system at pH 3.2-4.5 with lactic acid concentration of 5.7-13.5 g/L, and Lactobacillus was the superior sort. Bifidobacteria increased significantly at pH 4.5, resulting in the increase of acetic acid. Butyric acid fermentation was observed at pH 4...
September 8, 2018: Bioresource Technology
Heng-Xiang Li, Xiaohua Zhang, Qun Wang, Kang Zhang, Qing Cao, Li'e Jin
Mesocarbon microbeads (MCMB) from coal tar pitch have excellent mechanical strength, high density, and good thermal stability. Moreover, a great deal of aromatic constituents occur on its surface, favoring the substitution reaction of sulfonic group. Results showed that the total acid and -SO3 H amount was 4.36 mmol/g and 2.18 mmol/g, respectively. Moreover, the yield of total reducing sugar (TRS) and conversion ratio (Cr) for pretreated cellulose (DP = 101.5) can reach 66.7% and 68.8% at 140 °C for 240 min in distilled water, respectively...
September 8, 2018: Bioresource Technology
Lijian Leng, Huajun Huang
Biochar produced from biomass pyrolysis is becoming a powerful tool for carbon sequestration and greenhouse gas (GHG) emission reduction. Biochar C recalcitrance or biochar stability is the decisive property determining its carbon sequestration potential. The effect of pyrolysis process parameters on biochar stability is becoming a frontier of biochar study. This review discussed comprehensively how and why biomass compositions and physicochemical properties and biomass processing conditions such as pyrolysis temperature and reaction residence time affect the stability of biochar...
September 7, 2018: Bioresource Technology
Xiuxiu Ruan, Yaoyu Liu, Guoqing Wang, Ray L Frost, Guangren Qian, Daniel C W Tsang
In this study, lignin was selected as the main component of waste biomass to synthesise carbonaceous adsorbents with environmentally persistent free radicals (EPFRs) through hydrothermal carbonisation (HTC) under different conditions. The HTC method with Fe(III) doping was superior for promoting dehydration and decarboxylation of lignin hydrochar than that with HTC Cu(II) doping. The deconstruction of oxygen-containing groups of lignin was reduced while esterification was enhanced by Fe(III). The Fe(III) addition was conducive to the formation of EPFRs as carbon-centred radicals with an adjacent oxygen atom and oxygen-centred radicals...
September 6, 2018: Bioresource Technology
Fei Han, Wei Ye, Dong Wei, Weiying Xu, Bin Du, Qin Wei
Simultaneous nitrification-denitrification (SND) was achieved in submerged biofilm membrane bioreactor (SBF-MBR) treating low carbon/nitrogen (C/N) ratio wastewater. A novel bio-carrier coupling of sponge and biodegradable poly(butanediol succinate) (PBS) was applied as external carbon source and biofilm carrier. Result represented that NH4 + -N and total nitrogen removal efficiencies were high of 99.1% and 94.3% in the SBF-MBR. Protein (PN) contents from SND-biofilm were reduced by 10.5% and 44.3% in TB-EPS and LB-EPS, while polysaccharides (PS) were reduced by 45...
September 6, 2018: Bioresource Technology
Bailiang Xue, Yang Yang, Mingqiang Zhu, Yongchang Sun, Xinping Li
Lewis acid-catalyzed pretreatment in a biphasic system consisting of bio-based solvent 2-methyltetrahydrofuran (2-MeTHF) and water for a highly integrated one-pot catalytic transformation of lignocelluloses have been achieved. The aim of this work was to study the effects of different Lewis acid catalysts and pretreatment temperatures on the structural characteristics of precipitated lignin and enzymatic hydrolysis of the pretreated substrates, as well as the quantitative analysis of precipitates, solid residues, soluble carbohydrates and inhibitors...
September 6, 2018: Bioresource Technology
Sara Farmanbordar, Hamid Amiri, Keikhosro Karimi
Municipal solid waste (MSW) was used as a source for biobutanol production via acetone, butanol, and ethanol (ABE) fermentation. Organosolv pretreatment was used for simultaneous extraction of inhibitors, particularly tannins, and pretreatment of lignocellulosic fraction prior to hydrolysis. The hydrolysates of the pretreated MSW contained appreciable amounts of sugars and soluble starch together with a tolerable amount of inhibitors for Clostridium acetobutylicum. The hydrolysate obtained from MSW pretreated with 85% ethanol at 120 °C for 30 min fermented to the highest ABE concentration of 13...
September 5, 2018: Bioresource Technology
Péter Bakonyi, Gopalakrishnan Kumar, Katalin Bélafi-Bakó, Sang-Hyoun Kim, Stanislaw Koter, Wojciech Kujawski, Nándor Nemestóthy, Jakub Peter, Zbynek Pientka
This review article focuses on an assessment of the innovative Gas Separation Membrane Bioreactor (GS-MBR), which is an emerging technology because of its potential for in-situ biohydrogen production and separation. The GS-MBR, as a special membrane bioreactor, enriches CO2 directly from the headspace of the anaerobic H2 fermentation process. CO2 can be fed as a substrate to auxiliary photo-bioreactors to grow microalgae as a promising raw material for biocatalyzed, dark fermentative H2 -evolution. Overall, these features make the GS-MBR worthy of study...
September 5, 2018: Bioresource Technology
Feifei Wang, Baoyan Gao, Loudong Huang, Min Su, Chenming Dai, Chengwu Zhang
This study aimed to evaluate the potential of six oleaginous eustigmatophytes for use as biorefinery feedstock for the co-production of palmitoleic acid (PA) and biodiesel under different initial nitrogen concentrations (INCs). Six eustigmatophytes were studied, the nitrogen deficiency strategy significantly stimulated the simultaneous hyper-accumulation of PA and lipids, and led to a desirable fatty acid profile (FAP), except in Vacuoliviride sp. and Nannochloropsis oculata. Particularly, Eustigmatos cf. polyphem exhibited great potential when supplied with 1 mM INC and yielded the highest PA (29...
September 5, 2018: Bioresource Technology
Haifeng Zhuang, Hao Zhu, Shengdao Shan, Liting Zhang, Chengran Fang, Yun Shi
Waste sewage sludge was converted into the novel conductive material of nitrogen doped sewage sludge carbon (N-SC) to enhance anaerobic degradation of coal gasification wastewater (CGW). The results indicated that N-SC played a significant role in enhanced efficiencies, with chemical oxygen demand (COD) removal efficiency increased by 25.4%, methane production rate improved by 68.1% and total volatile fatty acids (VFA) decreased by 37.5% than that of controlled reactor. The conductivity, activity of electron transport, and extracellular polymeric substances (EPS) of anaerobic sludge were remarkably enhanced with N-SC, which promoted sludge granulation and supplied better conductive environment for microorganisms...
September 4, 2018: Bioresource Technology
Constantinos Katsimpouras, Grigorios Dedes, Perrakis Bistis, Dimitrios Kekos, Konstantinos G Kalogiannis, Evangelos Topakas
Ethanol production at high-gravity promise to achieve concentrations over the threshold for an economical distillation process and concurrently reduce water consumption. However, a persisting limitation is the poor mass transfer conditions resulting in low ethanol yields and concentrations. Hereby, the combination of an acetone/water oxidation pretreatment process (AWO) with a liquefaction/saccharification step, using a free-fall mixer, before simultaneous saccharification and fermentation (SSF) can realize ethanol concentrations of up to ca...
September 4, 2018: Bioresource Technology
Yuan Yang, Fei Yang, Weiwei Huang, Wenli Huang, Fei Li, Zhongfang Lei, Zhenya Zhang
Zero-valent iron (ZVI) supplementation for improving anaerobic digestion (AD) of ammonia-rich swine manure (initial ammonia-N ∼5000 mg/L) was tested. The addition of 5 g/L ZVI powder apparently accelerated the acidification process to produce more volatile fatty acids (VFAs) and optimized the fermentation type by contributing to a lower system oxidation-reduction potential (ORP) level of -181.7 to -250.0 mV favorable for ethanol-type and butyric-type fermentation during day 14-30, in comparison with that of -164...
September 4, 2018: Bioresource Technology
Alexandre Colzi Lopes, Antonio Valente, Diego Iribarren, Cristina González-Fernández
The techno-environmental performance of a medium-scale wastewater treatment system using high-rate algal ponds was evaluated through mass and energy balances and life cycle assessment. The system involves wastewater primary treatment, microalgae-based secondary treatment, thermal hydrolysis with steam explosion of microalgae, anaerobic co-digestion of pre-treated microalgal biomass and primary sludge, and biogas cogeneration. Furthermore, two scenarios based on alternative biogas uses were considered: (i) biogas for heat and electricity, and (ii) biogas for heat, electricity, and biomethane...
September 4, 2018: Bioresource Technology
Meichao Lan, Mei Li, Jun Liu, Xiao Quan, Yi Li, Baoan Li
Coal chemical reverse osmosis concentrate (ROC), which is characterized by high salinity and high organics, remains as a serious environmental problem. In this study, a lab-scale three-stage membrane-aerated biofilm reactor (MABR) system was designed to treat such a ROC. The effects of influent salinity and operating parameters (pH, DO and HRT) on the treatment efficiency were discussed. The removal efficiencies of COD, NH4 -N and TN under the optimal operating parameters reached to 81.01%, 92.31% and 70.72%, respectively...
September 4, 2018: Bioresource Technology
Zijun Dong, Wentao Shang, Wenyi Dong, Lingyan Zhao, Mu Li, Rui Wang, Feiyun Sun
Three ceramic MBRs (CMBR) installed with varied electrodes, i.e. Cu, Ti and Fe, were operated in parallel under the minute electric field to evaluate their suppression effect on membrane fouling, by comparison with control CMBR. Fe-CMBR released Fe2+ continuously to induce a higher organic removal efficiency and a smooth fouling rate. There was significant electric-flocculation effect in the Fe-CMBR, reflected by the increased sludge particle size and zeta potential, and to improve sludge filterability. Application of minute electric field could also affect the CMBR supernatant organic content and components, which was another reason for fouling mitigation...
September 4, 2018: Bioresource Technology
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