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Editorial Board 编辑委员会
IF 13 Q1 Environmental Science Pub Date : 2021-12-01 DOI: 10.18331/brj2021.8.4.1
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引用次数: 0
Modeling of thermochemical conversion of waste biomass – a comprehensive review 废弃生物质热化学转化的建模研究综述
IF 13 Q1 Environmental Science Pub Date : 2021-12-01 DOI: 10.18331/brj2021.8.4.3
Sinhara M. H. D. Perera, Chathuranga Wickramasinghe, B.K.T. Samarasiri, M. Narayana
Thermochemical processes, which include pyrolysis, torrefaction, gasification, combustion, and hydrothermal conversions, are perceived to be more efficient in converting waste biomass to energy and value-added products than biochemical processes. From the chemical point of view, thermochemical processes are highly complex and sensitive to numerous physicochemical properties, thus making reactor and process modeling more challenging. Nevertheless, the successful commercialization of these processes is contingent upon optimized reactor and process designs, which can be effectively achieved via modeling and simulation. Models of various scales with numerous simplifying assumptions have been developed for specific applications of thermochemical conversion of waste biomass. However, there is a research gap that needs to be explored to elaborate the scale of applicability, limitations, accuracy, validity, and special features of each model. This review study investigates all above mentioned important aspects and features of the existing models for all established industrial thermochemical conversion processes with emphasis on waste biomass, thus addressing the research gap mentioned above and presenting commercial-scale applicability in terms of reactor designing, process control and optimization, and potential ways to upgrade existing models for higher accuracy.
热化学过程,包括热解、焙烧、气化、燃烧和水热转化,被认为比生物化学过程更有效地将废弃生物质转化为能源和增值产品。从化学的角度来看,热化学过程非常复杂,对许多物理化学性质非常敏感,因此使反应器和过程建模更具挑战性。然而,这些工艺的成功商业化取决于优化的反应器和工艺设计,这可以通过建模和仿真有效地实现。针对废弃生物质的热化学转化的具体应用,已经开发了具有许多简化假设的各种规模的模型。然而,对于每个模型的适用性、局限性、准确性、有效性和特殊性的尺度,需要探索研究的空白。本综述研究对所有已建立的工业热化学转化过程的现有模型的上述重要方面和特征进行了研究,重点是废弃生物质,从而弥补了上述研究空白,并在反应器设计、过程控制和优化方面展示了商业规模的适用性,以及升级现有模型以提高精度的潜在途径。
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引用次数: 64
A review on the application of nanomaterials in improving microbial fuel cells 纳米材料在微生物燃料电池改进中的应用综述
IF 13 Q1 Environmental Science Pub Date : 2021-06-01 DOI: 10.18331/BRJ2021.8.2.5
M. Mashkour, M. Rahimnejad, F. Raouf, N. Navidjouy
Materials at the nanoscale show exciting and different properties. In this review, the applications of nanomaterials for modifying the main components of microbial fuel cell (MFC) systems (i.e., electrodes and membranes) and their effect on cell performance are reviewed and critically discussed. Carbon and metal-based nanoparticles and conductive polymers could contribute to the growth of thick anodic and cathodic microbial biofilms, leading to enhanced electron transfer between the electrodes and the biofilm. Extending active surface area, increasing conductivity, and biocompatibility are among the significant attributes of promising nanomaterials used in MFC modifications. The application of nanomaterials in fabricating cathode catalysts (catalyzing oxygen reduction reaction) is also reviewed herein. Among the various nanocatalysts used on the cathode side, metal-based nanocatalysts such as metal oxides and metal-organic frameworks (MOFs) are regarded as inexpensive and high-performance alternatives to the conventionally used high-cost Pt. In addition, polymeric membranes modified with hydrophilic and antibacterial nanoparticles could lead to higher proton conductivity and mitigated biofouling compared to the conventionally used and expensive Nafion. These improvements could lead to more promising cell performance in power generation, wastewater treatment, and nanobiosensing. Future research efforts should also take into account decreasing the production cost of the nanomaterials and the environmental safety aspects of these compounds.
纳米级材料表现出令人兴奋的不同性质。本文综述了纳米材料在修饰微生物燃料电池(MFC)系统主要部件(即电极和膜)方面的应用及其对电池性能的影响。基于碳和金属的纳米颗粒以及导电聚合物可以促进厚的阳极和阴极微生物生物膜的生长,从而增强电极和生物膜之间的电子转移。扩展活性表面积、增加导电性和生物相容性是用于MFC改性的有前途的纳米材料的重要特性。综述了纳米材料在制备阴极催化剂(催化氧还原反应)中的应用。在阴极侧使用的各种纳米催化剂中,金属氧化物和金属有机框架(MOFs)等金属基纳米催化剂被认为是传统使用的高成本Pt的廉价和高性能的替代品。此外,与传统使用且昂贵的Nafion相比,用亲水和抗菌纳米颗粒修饰的聚合物膜可以导致更高的质子传导性并减轻生物污垢。这些改进可能会在发电、废水处理和纳米生物传感方面带来更有前景的电池性能。未来的研究工作还应考虑到降低纳米材料的生产成本和这些化合物的环境安全方面。
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引用次数: 33
Editorial Board 编辑委员会
IF 13 Q1 Environmental Science Pub Date : 2021-06-01 DOI: 10.18331/brj2021.8.2.1
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引用次数: 0
Effects of particle size of cerium oxide nanoparticles on the combustion behavior and exhaust emissions of a diesel engine powered by biodiesel/diesel blend 纳米氧化铈颗粒尺寸对生物柴油/柴油混合动力柴油机燃烧行为和废气排放的影响
IF 13 Q1 Environmental Science Pub Date : 2021-06-01 DOI: 10.18331/BRJ2021.8.2.3
P. Dinesha, Shiva Kumar, M. Rosen
Meeting the emission norms specified by governing bodies is one of the major challenges faced by engine manufacturers, especially without sacrificing engine performance and fuel economy. Several methods and techniques are being used globally to reduce engine emissions. Even though emissions can be reduced, doing so usually entails a deterioration in performance. To address this problem, nanoadditives such as cerium oxide (CeO2) nanoparticles are used to reduce engine emissions while improving engine performance. However, some aspects of the application of these nanoadditives are still unknown. In light of that, three sizes of CeO2 nanoparticles (i.e., 10, 30, and 80 nm) and at a constant volume fraction of 80 ppm were added to a 20% blend of waste cooking oil biodiesel and diesel (B20). A single-cylinder diesel engine operating at a 1500 rpm speed and 180 bar fuel injection pressure was used to compare the performance and emission characteristics of the investigated fuel formulations. The results showed that the addition of CeO2 nanoparticles led to performance improvements by reducing brake specific fuel consumption. Moreover, the catalytic action of CeO2 nanoparticles on the hydrocarbons helped achieve effective combustion and reduce the emission of carbon monoxide, unburnt hydrocarbon, oxides of nitrogen, and soot. Interestingly, the size of the nanoadditive played an instrumental role in the improvements achieved, and the use of 30 nm-sized nanoparticles led to the most favorable performance and the lowest engine emissions. More specifically, the fuel formulation harboring 30 nm nanoceria reduced brake specific fuel consumption by 2.5%, NOx emission by 15.7%, and smoke opacity by 34.7%, compared to the additive-free B20. These findings could shed light on the action mechanism of fuel nanoadditives and are expected to pave the way for future research to develop more promising fuel nanoadditives for commercial applications.
满足管理机构规定的排放标准是发动机制造商面临的主要挑战之一,尤其是在不牺牲发动机性能和燃油经济性的情况下。全球正在使用几种方法和技术来减少发动机排放。尽管排放量可以减少,但这样做通常会导致性能下降。为了解决这个问题,纳米添加剂如氧化铈(CeO2)纳米颗粒被用于减少发动机排放,同时提高发动机性能。然而,这些纳米添加剂应用的某些方面仍然未知。有鉴于此,将三种尺寸的CeO2纳米颗粒(即,10、30和80nm)和80ppm的恒定体积分数添加到废食用油生物柴油和柴油(B20)的20%混合物中。使用在1500rpm转速和180bar燃料喷射压力下运行的单缸柴油发动机来比较所研究的燃料配方的性能和排放特性。结果表明,CeO2纳米颗粒的加入降低了制动器的比油耗,从而提高了性能。此外,CeO2纳米颗粒对碳氢化合物的催化作用有助于实现有效燃烧,并减少一氧化碳、未燃烧碳氢化合物、氮氧化物和烟灰的排放。有趣的是,纳米添加剂的尺寸在所实现的改进中发挥了重要作用,使用30nm尺寸的纳米颗粒可以获得最有利的性能和最低的发动机排放。更具体地说,与不含添加剂的B20相比,含有30nm纳米二氧化铈的燃料配方降低了2.5%的制动比燃料消耗、15.7%的NOx排放和34.7%的烟雾不透明度。这些发现可能揭示燃料纳米添加剂的作用机制,并有望为未来研究开发更具商业应用前景的燃料纳米添加剂铺平道路。
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引用次数: 26
Comparison of acetone–butanol–ethanol fermentation and ethanol catalytic upgrading as pathways for butanol production: A techno-economic and environmental assessment 丙酮-丁醇-乙醇发酵和乙醇催化升级作为丁醇生产途径的比较:技术经济和环境评估
IF 13 Q1 Environmental Science Pub Date : 2021-06-01 DOI: 10.18331/BRJ2021.8.2.4
Estefanny Carmona-Garcia, P. Marín-Valencia, J. Solarte-Toro, K. Moustakas, C. A. Cardona-Alzate
Butanol is an important compound used as a building block for producing value-added products and an energy carrier. The main butanol production pathways are conventional acetone–butanol–ethanol (ABE) fermentation and catalytic upgrading of ethanol. On the other hand, the application of biomass as a promising substrate for biofuel production has been widely considered recently. However, few studies have compared different butanol production pathways using biomass as raw material. In light of that, the present work aims (i) to provide a short review of the catalytic ethanol upgrading and (ii) to compare conventional ABE fermentation and catalytic ethanol upgrading processes from the economic and environmental perspectives. Aspen Plus v9.0 was used to simulate both processes. The economic and environmental assessments were carried out considering the Colombian economic context, a gate-to-gate approach, and single impact categories. Considering a processing scale of 1000 ton/d, the conventional ABE fermentation process presented a more favorable technical, economic, and environmental performance for butanol production from biomass. It also offered lower net energy consumption (i.e., 57.9 GJ/ton of butanol) and higher butanol production (i.e., 2.59 ton/h). Nevertheless, the proposed processing scale was insufficient to reach economic feasibility for both processes. To overcome this challenge, the minimum processing scale had to be higher than 1584 ton/d and 1920 ton/d for conventional ABE fermentation and catalytic ethanol upgrading, respectively. Another critical factor in enhancing the economic feasibility of both butanol production pathways was the minimum selling price of butanol. More specifically, prices higher than 1.56 USD/kg and 1.80 USD/kg would be required for conventional ABE fermentation and catalytic ethanol upgrading, respectively. From the environmental impact point of view, the conventional ABE fermentation process led to a lower potential environmental impact than catalytic ethanol upgrading (0.12 PEI/kg vs. 0.18 PEI/kg, respectively).
丁醇是一种重要的化合物,用于生产增值产品和能量载体。丁醇的主要生产途径是传统的丙酮-丁醇-乙醇(ABE)发酵和乙醇的催化升级。另一方面,生物质作为生物燃料生产的一种有前景的基质,近年来得到了广泛的应用。然而,很少有研究对以生物质为原料的不同丁醇生产途径进行比较。鉴于此,本研究旨在(i)对催化乙醇升级进行简要综述,(ii)从经济和环境的角度比较传统的ABE发酵和催化乙醇升级工艺。使用Aspen Plus v9.0来模拟这两个过程。经济和环境评估是考虑到哥伦比亚的经济背景、门到门方法和单一影响类别进行的。考虑到1000吨/天的处理规模,传统的ABE发酵工艺对生物质丁醇的生产具有更有利的技术、经济和环境性能。它还提供了较低的净能耗(即57.9吉焦/吨丁醇)和较高的丁醇产量(即2.59吨/小时)。然而,拟议的加工规模不足以达到这两种工艺的经济可行性。为了克服这一挑战,常规ABE发酵和催化乙醇升级的最小处理规模必须分别高于1584吨/天和1920吨/天。提高两种丁醇生产途径的经济可行性的另一个关键因素是丁醇的最低销售价格。更具体地说,传统ABE发酵和催化乙醇升级的价格分别需要高于1.56美元/公斤和1.80美元/公斤。从环境影响的角度来看,传统ABE发酵工艺的潜在环境影响低于催化乙醇升级(分别为0.12 PEI/kg和0.18 PEI/kg)。
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引用次数: 9
A comparative evaluation of design factors on bubble column operation in photosynthetic biogas upgrading 光合沼气提质中气泡柱操作设计因素的比较评价
IF 13 Q1 Environmental Science Pub Date : 2021-06-01 DOI: 10.18331/BRJ2021.8.2.2
A. Bose, R. O’Shea, Richen Lin, J. Murphy
Studies attempting to optimise photosynthetic biogas upgrading by simultaneous investigation of the bubble column-photobioreactor setup have experienced considerable variability in results and conclusions. To identify the sources of such variation, this work quantitatively compared seven design factors (superficial gas velocity; liquid to gas flow rate (L/G) ratio; empty bed residence time; liquid inlet pH; liquid inlet alkalinity; temperature; and algal concentration) using the L16 Taguchi orthogonal array as a screening design of experiment. Assessments were performed using the signal to noise (S/N) ratio on the performance of CO2 removal (CO­2 removal efficiency, CO2 absorption rate, and overall CO2 mass transfer coefficient) and O2 stripping (O2 concentration in biomethane and O2 flow rate in biomethane). Results showed that pH and L/G ratio were the most critical design factors. Temperature and gas residence times had minimal impact on the biomethane composition. The interactive effect between pH and L/G ratio was the most impactful, followed by the interactive effects between superficial gas velocity and L/G ratio and pH on CO2 removal efficiency. The impact of L/G ratio, algal concentration, and pH (in that order of impact) caused up to a 90% variation in oxygen content in biomethane. However, algal concentration had a diminishing role as the L/G ratio increased. Using only the statistically significant main effects and interactions, the biomethane composition (CO2% and O2%) was predicted with over 95% confidence through regression equations for superficial gas velocity up to 0.2 cm/s.
试图通过同时研究气泡柱光生物反应器装置来优化光合沼气升级的研究在结果和结论上经历了相当大的变化。为了确定这种变化的来源,本工作定量地比较了七个设计因素(表观气体速度、液气流速(L/G)比;空床停留时间;液体入口pH;液体入口碱度;温度以及藻类浓度)作为实验的筛选设计。使用信噪比对CO2去除性能(CO2去除效率、CO2吸收率和总CO2传质系数)和O2汽提性能(生物甲烷中的O2浓度和生物甲烷中O2流速)进行评估。结果表明,pH和L/G比是最关键的设计因素。温度和气体停留时间对生物甲烷组成的影响最小。pH与L/G比的交互作用对CO2去除效率的影响最大,其次是表观气体流速与L/G比对pH的交互作用。L/G比、藻类浓度和pH的影响(按影响顺序)导致生物甲烷中氧含量变化高达90%。然而,随着L/G比的增加,藻类浓度的作用逐渐减弱。仅使用统计上显著的主要影响和相互作用,通过表观气体速度高达0.2 cm/s的回归方程,预测生物甲烷组成(CO2%和O2%)的置信度超过95%。
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引用次数: 9
Alkaline modified A-site deficient perovskite catalyst surface with exsolved nanoparticles and functionality in biomass valorisation 碱性改性的A位缺陷钙钛矿催化剂表面具有出溶纳米颗粒和生物质增值功能
IF 13 Q1 Environmental Science Pub Date : 2021-03-01 DOI: 10.18331/BRJ2021.8.1.5
A. Umar, D. Neagu, J. Irvine
Environmental problems associated with the use of fossil fuels and increase in energy demands due to rise in population and rapid industrialisation, are the driving forces for energy. Catalytic conversion of biomass to renewable energies is among the promising approaches to materialize the above. This requires development of robust catalysts to suppress deactivation due to carbon deposition and agglomeration. In this work, surface properties and chemistry such as exsolution of B-site metal catalyst nanoparticles, particle size and distribution, as well as catalyst-support interactions were tailored through the use of alkaline dopants to enhance catalytic behaviour in valorisation of glycerol. The incorporation of alkaline metals into the lattice of an A-site deficient perovskite modified the surface basic properties and morphology with a consequent robust catalyst-support interaction. This resulted in promising catalytic behaviour of the materials where hydrogen selectivity of over 30% and CO selectivity of over 60% were observed. The catalyst ability to reduce fouling of the catalyst surface as a result of carbon deposition during operation was also profound due to the robust catalyst-support interaction occurring at the exsolved nanoparticles due to their socketing and the synergy between the dopant metals in the alloy in perovskite catalyst systems. In particular, one of the designed systems, La0.4Sr0.2Ca0.3Ni0.1Ti0.9O3±δ, displayed almost 100% resistance to carbon deposition. Therefore, lattice rearrangement using exsolution and choice of suitable dopant could be tailored to improve catalytic performance.
与使用化石燃料有关的环境问题以及由于人口增长和快速工业化而导致的能源需求增加是能源的驱动力。催化生物质转化为可再生能源是实现上述目标的有希望的方法之一。这就需要开发强大的催化剂来抑制由于碳沉积和团聚而导致的失活。在这项工作中,通过使用碱性掺杂剂来增强甘油增值的催化行为,研究了表面性质和化学性质,如b位金属催化剂纳米颗粒的析出,颗粒大小和分布,以及催化剂-载体相互作用。将碱金属掺入缺乏a位的钙钛矿晶格中,改变了钙钛矿的表面基本性质和形貌,从而产生了强大的催化-载体相互作用。结果表明,该材料的氢选择性超过30%,CO选择性超过60%,具有良好的催化性能。由于在钙钛矿催化剂体系中,溶解的纳米颗粒由于嵌套和合金中掺杂金属之间的协同作用而产生了强大的催化剂-载体相互作用,因此催化剂能够减少由于运行过程中碳沉积而导致的催化剂表面污垢。其中,La0.4Sr0.2Ca0.3Ni0.1Ti0.9O3±δ具有100%的抗积碳性能。因此,可以通过脱溶和选择合适的掺杂剂来调整晶格重排以提高催化性能。
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引用次数: 14
Editorial Board 编辑委员会
IF 13 Q1 Environmental Science Pub Date : 2020-12-01 DOI: 10.18331/brj2020.7.4.1
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引用次数: 0
Editorial Board 编辑委员会
IF 13 Q1 Environmental Science Pub Date : 2020-09-01 DOI: 10.18331/brj2020.7.3.1
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引用次数: 0
期刊
Biofuel Research Journal-BRJ
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