Search Results (126)

Synthetic natural gas (SNG) production from biomass residues represents a promising strategy to reduce greenhouse gas emissions and enhance energy security in regions with abundant agricultural waste. This study evaluates the thermodynamic performance of SNG synthesis from rice husk (RH) and empty fruit bunches (EFB) bio-oils, major residues in the department of Bolívar, Colombia. The process was simulated in Aspen Plus^®, integrating syngas data and methanation under equilibrium conditions at 320 °C and 30 bar, complemented by hydrogen injection via alkaline electrolysis to maintain an H₂/CO ratio above 3. Energy and exergy analyses were performed to quantify efficiencies and irreversibilities. Results indicate carbon conversion rates of 48.3% for EFB and 47.4% for RH, producing SNG with 96% CH₄ suitable for grid injection. Energy efficiencies reached 71.9% and 71.0%, while exergy efficiencies were 87.2% and 82.9%, respectively, aligning with or surpassing literature benchmarks. The main irreversibilities occurred in methanation and CO₂ removal, highlighting thermal integration and gas recycling as key improvement strategies. These findings demonstrate the potential of leveraging local biomass for clean energy production and support the development of Power-to-Gas systems in Colombia. Full article

Haemophilus influenzae b (Hib) is a pathogenic bacterium that causes meningitis worldwide, mainly in children less than two years old. The capsular polysaccharide b (PRP) is an essential antigen for vaccine formulation. This study aimed to develop a high-yield, technically accessible production strategy for PRP production to facilitate vaccine manufacturing in non-profit laboratories. Various fed-batch cultivation strategies were evaluated to address metabolic limitations and identify a robust, simplified process suitable for seamless scale-up to pilot scale. Glucose limitation strategies did not reduce inhibitory acetic acid accumulation due to deficiencies in Hib’s respiratory chain, whereas oxygen availability was identified as critical parameter. Increasing the specific air flow from 0.5 to 1.0 vvm in constant fed-batch (Cfb) resulted in a 33% yield increase, reaching 1706.40 mg PRP.L⁻¹. However, the highest PRP concentration was achieved using exponential fed-batch with cell recycling (EfbCR), resulting in 1879.28 mg PRP.L⁻¹. Although EfbCR offered high productivity, the Cfb strategy emerged to be the most technically feasible and robust solution and was successfully scaled up to an 80 L bioreactor, achieving 1885 mg PRP.L⁻¹. These results advance understanding of PRP production by Hib and provides valuable insight into an efficient and simplified strategy for producing this key/vital vaccine antigen. The findings support the potential for cost-effective local production in public health initiatives. Full article

This study analyzes the valorization of oil palm biomass residues within the framework of industrial symbiosis (IS), emphasizing their role in circular economy strategies and sustainable industrial development. Through a systematic literature review and snowball sampling, 156 articles indexed in Scopus and Web of Science were examined, classifying evidence by country, type of residue, derived products, economic sector (ISIC Rev. 4), and technological approach. The results show a strong geographical concentration of IS experiences in Asia, particularly Malaysia, Indonesia, and Thailand, where residues such as empty fruit bunches (EFB), palm kernel shells (PKS), oil palm mesocarp fibers, palm oil mill effluent (POME), and oil palm trunks (OPT) are integrated into processes for bioenergy, biochemicals, composite materials, construction products, biochar, and bioplastics. In contrast, applications in Latin America and Africa remain incipient, with high potential but limited industrial implementation due to infrastructural and regulatory gaps. Technological trends point toward thermo-chemical and biological conversion routes (pyrolysis, gasification, hydrothermal carbonization, anaerobic digestion), development of advanced materials and catalysts, and the emergence of integrated biorefinery models supported by computational optimization tools. The analysis highlights that palm biomass residues, far from being an environmental liability, constitute strategic resources for low-carbon value chains. However, scaling IS initiatives requires clear public policies, economic incentives, and stronger coordination between industry, government, and academia. The study provides a structured overview of current knowledge, identifies research gaps, and outlines future directions for leveraging oil palm residues as a key input for sustainable IS. Full article

In Colombia, two main palm varieties, Elaeis guineensis and Elaeis oleifera, are cultivated for the production of crude palm oil (CPO). During the CPO extraction process, several residues are generated, including empty fruit bunches (EFB), nut fiber, palm kernel cake, and Palm Oil Mill Effluent (POME), among others. These residues are commonly used for biochar and compost production to improve soil quality, for biogas generation, and for energy production through biomass combustion. Because the rachis is rich in lignocellulosic material and exhibits physicochemical properties suitable for thermochemical processes, it is proposed as a feedstock for hydrogen synthesis through gasification. In this study, a techno-economic analysis and an FP²O resilience assessment were conducted for a hydrogen production process based on the utilization of palm rachis generated in María la Baja, northern Colombia. The economic evaluation results indicate that the capital investment required for plant installation is USD 10,111,255.23. The economic indicators show favorable performance with a Return on Investment (ROI) of 58.83%, a Net Present Value (NPV) of USD 25.01 million, a B/C ratio of 3.29, and a Discounted Payback Period (DPBP) of 4.54 years. Regarding techno-economic resilience, critical values for processing capacity, selling price, and feedstock cost were identified through parameter variation. The findings suggest that the process has opportunities for improvement, since small changes in these variables could significantly reduce its resilience. Finally, an On-Stream efficiency of 39.65% at the break-even point was obtained, indicating that the process can operate at less than 50% of its maximum capacity while still generating significant profits. Full article

Empty fruit bunches (EFBs) and kenaf are two abundant sources of lignocellulosic resource agricultural waste with potential as substrates for mycelium-based composites (MBCs). These composites are lightweight, compostable, low-cost, and suitable for packaging applications. However, their performance is highly dependent on the type of lignocellulosic substrate and the processing conditions applied during production. Despite the promising availability of natural fibers, limited research has focused on the drying process that affects the quality of MBCs. This study investigates the effect of different drying times (12, 18, and 24 h) on the physical and mechanical properties of MBCS produced from EFB and kenaf substrates. Following a 20-day incubation period under controlled conditions, the composites were oven-dried and analyzed for mycelial colonization, density measurement, shrinkage, water loss, shore A hardness, impact resistance, and mold growth. The results demonstrated that a drying time of 24 h yielded the best overall performance. Moisture loss (67.00%) and shrinkage (50.70%) increased with longer drying times (24 h), particularly in kenaf-based composites. Extended drying minimized mold contamination and enhanced the structural integrity of the composites. Overall, EFB-based composites achieved the highest Shore A hardness (44.53 HA). These findings show that optimizing the drying time enhances the durability of MBCs, reinforcing their potential as sustainable, biodegradable alternatives to polystyrene and promoting the development of eco-friendly materials. Full article

The Água Forte (AF) stream located in the Southern Alentejo region (Portugal), is a tributary of the Roxo river. The AF stream has acid mining drainage (AMD) traits, which contributes to the degradation of the river’s water quality and the adjacent soils. The use of ecological floating beds (EFBs) is an eco-rehabilitation strategy for polluted waters. This work aimed to evaluate the application of EFBs at real-scale as a water treatment system for the AF stream. Thus, three EFB, planted with Vetiveria zizanioides (3.3 m²·unit⁻¹; density 40.5 plants·m⁻²), were placed on the stream. The water quality was monitored monthly, upstream (Inlet) and downstream (Outlet) of EFBs, from May 2020 to November 2021. With the use of the EFBs, the pH remained acidic, and the other main parameters showed average removal rates of around: 8% organic matter; 7% sulphates; 4% chlorides; 18% nitrogen, 30% copper, 29% zinc, 53% iron, and 10% manganese. Inlet and Outlet mass loads correlations showed high removal diversity. For the parameters under analysis, during the treatment period, the removal efficiency showed high variability due to the hydraulic conditions. The higher removal efficiencies were obtained for low-hydraulic retention times, except for heavy metals. Overall, EFBs showed some potential, but their efficiency was variable, highlighting the need for optimization under variable hydraulic conditions. Full article

Background/Objectives: Superficial gastric neoplasms, including dysplasia and early adenocarcinoma, are increasingly managed by endoscopic submucosal dissection (ESD). Preoperative assessment relies on endoscopic forceps biopsy (EFB), despite its limited ability to predict final histology. The diagnostic value of repeat biopsy, the influence of the endoscopy setting where biopsies were taken, and the clinical relevance of histologic discrepancies remain incompletely defined. Methods: We conducted a retrospective, single-center study of 270 superficial gastric lesions resected by ESD between 2015 and 2024. Histologic concordance between EFB and ESD was evaluated, including comparisons between initial and repeated biopsies, and between community- and hospital-based settings. Multivariable models identified predictors of histologic discrepancy and assessed the impact of underestimation on curative resection. The association between biopsy repetition and submucosal fibrosis was also explored. Results: Histologic concordance between EFB and ESD was 54.1%, with underestimation in 41.1% and severe underestimation in 8.9%. Repeat biopsy improved concordance from 39.3% to 60.7% (p = 0.007) and increased adenocarcinoma sensitivity from 12.5% to 56.3%, without increasing submucosal fibrosis. Hospital-based biopsies outperformed community-based ones across all diagnostic metrics. In multivariable analysis, older age and larger lesion size were independent predictors of discrepancy. Histologic underestimation was independently associated with a lower likelihood of curative resection (OR = 0.148; p = 0.003), although only six lesions ultimately exceeded formal ESD criteria due to undetected high-risk features. Conclusions: EFB frequently underestimates histological severity in superficial gastric neoplasia. Repeat biopsy and centralized evaluation significantly improve diagnostic accuracy without increasing procedural risk. However, the role of biopsy lies primarily in excluding high-risk features rather than providing definitive staging. In this context, ESD serves not only as curative therapy but also as a key diagnostic step for accurate staging and treatment planning. Full article

Background: Mechanical ventilation compromises airway clearance, with expiratory flow bias (EFB) being a critical determinant of mucus transport. The rapid chest compression technique (RCCT) generates high EFB, yet evidence in neurocritical patients is limited due to concerns regarding intracranial pressure (ICP). This secondary analysis of a randomized controlled trial examined the effects of RCCT on ventilatory mechanics and physiology in acute brain-injured patients under invasive ventilation. Methods: Fifty neurocritical patients were randomized to RCCT (Intervention) or passive leg mobilization (Control). RCCT was applied bilaterally during expiration once every three respiratory cycles for 5 min; controls underwent 5 min of passive cycling. EFB, derived from inspiratory and expiratory peak flows, was assessed at baseline (T–5), during intervention (T0–T5), and post-intervention (T+5, T+30). Arterial blood gases, mean arterial pressure (MAP), heart rate (HR), and ICP were also analyzed. Group comparisons used parametric/non-parametric tests; associations were explored via Spearman’s rho. Results: Baseline EFB did not differ between groups. From T0 to T5, Intervention patients showed significantly higher EFB (all p < 0.001). PaCO₂ decreased within the Intervention group (p = 0.015) but not in controls (p = 0.601). No between-group ΔPaCO₂ differences emerged. At T5, HR correlated negatively with EFB (ρ = −0.49, p = 0.013). No associations were found with age, sex, lesion type, MAP, or ICP. Conclusions: RCCT effectively increased EFB in ventilated neurocritical patients without affecting ICP, supporting its safety and potential role in airway clearance. Full article

This study presents FARMBENV, a user-friendly, real-time, and web-based LCA tool developed specifically for the agricultural sector, enabling dynamic environmental impact assessments and supporting Environmental Product Declarations (EPDs). To demonstrate its functionality, three wheat production systems in Greece—differing in harvest frequency and the use of green manure through the addition of vetch—were assessed using primary data. Environmental impacts were calculated using a cradle-to-gate approach, with a functional unit of 1000 kg of wheat. Results from FARMBENV were validated with OpenLCA v2.4.1, confirming the tool’s accuracy. The addition of vetch in wheat production significantly reduced the Global Warming Potential (GWP), while the single-harvest systems applying green manure present better environmental sustainability performance. In addition, lab-scale experiments were conducted to process wheat residues via three waste-to-energy (WtE) pathways—pellet, biodiesel, and bioethanol production—and their environmental performance was assessed under multiple electricity sourcing scenarios. The source of electricity for the production systems is crucial for minimizing the impact on the GWP for the WtE pathways. The integration of WtE pathways and wheat production scenarios reduces the GWP by up to 49%. Overall, this study demonstrates FARMBENV’s capacity to deliver real-time, scenario-specific LCA results and highlights the potential of circular bioenergy strategies in sustainable agriculture. Full article

Recently, an urgent need has been identified to increase the biodiversity of the cereal crops that dominate European farmlands. In this aspect, the addition of pea as a component of winter cereals seems justified, but the appropriate selection of the cultivars to create a mixture suitable for agricultural practice is probably essential. Therefore, arbitrarily selected winter pea cultivars were intercropped with some chosen cereals in order to assess certain yield parameters using a two-factorial field experiment conducted on brown soil. The studied factors were the cultivar of pea (Pisum sativum), ‘Pandora’ and ‘E.F.B. 33′ respectively, and the cropping system: single crop vs. cereal/legume intercropping mixture. Cereals used were rye (Secale cereale L.) ‘Amber’ and triticale (× Triticosecale) ‘Borwo’. To assess the potential of winter pea in this cultivation system, the yield level, some plant parameters (above- and belowground), and LER and CR indices were applied. Additionally, to demonstrate the effect of intercropping on pea, the root system, root nodulation, and nitrogen uptake efficiency were assessed. It was shown that yield and plant indices were closely related to the intercropping variant used. The key element determining the potential of the cultivated crops was the selection of cultivars. The most productive one was proved pea ‘E.F.B. 33’, which formed the largest number of nodules when intercropped with triticale. Moreover, it was ascertained that the drought period during the formation of nodules negatively affected their structure, which had a rather negative impact on the pea yield. Full article

Background/Objectives: Physical fitness is a key determinant of health in university students, a population at risk of sedentary behaviors and lifestyle-related health issues. The European Fitness Badge (EFB) provides a comprehensive assessment of fitness parameters and individualized feedback. This study aimed to evaluate the physical fitness of Romanian university students using the EFB to examine the effects of activity profile, sex, age, and academic major and to associate physical fitness with body composition indices, including Body Mass Index (BMI) and A Body Shape Index (ABSI). Methods: A cross-sectional study was conducted with 180 university students (43.33% male; age 18–53 years). Participants were categorized into two fitness profiles: Basic (TP1) and Advanced (TP2). Physical fitness was assessed through standardized EFB protocols measuring endurance, strength, flexibility, coordination, and overall fitness. Independent t-tests, one- and two-way ANOVA, and Pearson correlations were used to analyze differences and associations. Results: TP2 participants scored significantly higher in endurance, strength, coordination, and overall fitness, Males outperformed females in strength and coordination. Strength decreased with age, particularly in the oldest group. The sports students demonstrated superior fitness compared to peers in other majors. Two-way ANOVA revealed significant interactions between profile and sex for strength and overall fitness. BMI and ABSI were negatively correlated with physical fitness, in strength, coordination, and overall fitness. Conclusions: The EFB proved effective in differentiating physical fitness profiles. Demographic factors and body composition influenced fitness outcomes, underscoring the need for targeted, profile-based physical activity strategies specifically adapted to university curricula and extracurricular sport programs. However, the findings should be interpreted in light of the study’s geographic limitation, as the sample included only Romanian university students. Full article

This paper investigated the changes in anatomy, ultrastructure and lignin distribution of oil palm empty fruit bunch (EFB) by bisulfite pretreatment. It was found that after bisulfite pretreatment, a large number of pores formed in the cell walls, and the removal of part of the lignin in the cell wall corner, partial middle layer, and other locations made the tissue structure of the EFB looser, which uncovered cellulose and broke the steric hindrance of cellulase access to cellulose in EFB, and also weakened the negative influence of lignin on cellulase. The changes can greatly contribute to the improvement of enzymatic hydrolysis after bisulfite pretreatment, which is consistent with the increased saccharification efficiency of the pretreated EFB. Poplar was also used to compare the differences and similarities between non-wood and wood materials. Full article

This work presents an effective design of a strategy to manage biomass waste (empty fruit bunch—EFB, kernel shell, and fiber) available from the processing of oil palm (Elaeis guineensis) in Colombia as a renewable energy source. This type of study is conducted for the first time in the country, and the proposed strategy is structured in four phases. Firstly, an inventory of available biomass waste was prepared based on information from 45 African palm oil companies of the approximately 70 that exist in the country. It was determined that the country had about 2762 kt of available waste (63.64% EFB, 12.55% kernel shell, and 23.81% fiber) for the year 2023. The estimates were conducted using a model that correlates processing capacity, the biomass generated, and the biomass demanded. The validation was performed using national reports. Subsequently, the minimum number (six) of storage centers in Colombia, where the largest amount of biomass can be stored, was determined. The center of gravity method was used to find the geographical location of each bulk storage center (municipality of Aracataca, Agustín Codazzi, San Martín, Puerto Wilches, Castilla La Nueva, and Cabuyaru). The next step was to determine the transportation costs as a decision criterion to select the best bulk storage center. When the required storage capacity does not exceed 211 kt·year⁻¹, Agustín Codazzi is the best option because it has the lowest transportation cost (USD 1.01·t⁻¹). When the storage capacity requirements exceed 211 kt·year⁻¹ but are less than 423 kt·year⁻¹, then Puerto Wilches and/or Aracataca are the best options (transportation cost of USD 1.7·t⁻¹). In all cases, Cabuyaru has the highest costs (USD 6.56·t⁻¹). Finally, an energy potential of 50,196 × 10⁶ GJ·year⁻¹ for the collected biomass was estimated, which makes this kind of waste an environmental alternative that could replace coal in Colombia. Full article

EFB is a biomass waste primarily generated in Southeast Asia, and its pyrolysis enables both waste management and conversion into valuable products. In pyrolysis, the heating rate is a crucial factor; however, studies on its influence on EFB are extremely limited. This study investigates the pyrolysis characteristics of EFB by analyzing product properties based on reaction temperature and heating rate. TGA showed that the thermal decomposition of EFB begins at approximately 210 °C and is largely complete by 400 °C. Furthermore, kinetic analysis using TGA data, applying both differential and integral methods, revealed distinct trends. Through pyrolysis experiments using a fixed-bed reactor, the yield analysis of products under varying reaction temperatures and heating rates demonstrated that higher temperatures promote pyrolysis, leading to a decrease in biochar yield and an increase in gas product yield. For liquid products, a higher heating rate suppressed secondary reactions and led to an increase in the yield of the aqueous phase. Gas product characterization revealed that CO and CO₂ formation began simultaneously at approximately 270 °C. GC-MS analysis of the liquid products recovered under different pyrolysis conditions showed that most compounds contained oxygen, originating from hemicellulose, cellulose, and lignin. Additionally, FT-IR analysis of the biochar confirmed that oxygen-containing functional groups decomposed as pyrolysis progressed, and the presence of turbostratic carbon and crystallinity influenced by trace inorganic elements was identified. Full article

This study aimed to investigate how subjective norms (SNs) and green self-efficacy (GSE) mediate the relationship between marine environmental attitudes (MEAs) and environmentally friendly behavior (EFB) among Chinese undergraduates, using a cross-sectional survey of 673 university undergraduates from two universities in China. Structural equation modeling (SEM) was used to test the mediation effects between those four constructs. The results showed that SNs (β = 0.352, SE = 0.031, 95% CI [0.218, 0.421], p < 0.001) significantly mediated the relationship between MEA and EFB. In addition, GSE (β = 0.078, SE = 0.038, 95% CI [0.043, 0.091], p < 0.001) mediated the relationship between MEA and EFB to a lesser extent. These findings suggest that interventions targeting both SNs and GSE may be useful to promote greater levels of EFB among Chinese undergraduates, and underline the importance of considering gender, years at university, major field of study, and marine environmental courses when designing and evaluating intervention programs for Chinese undergraduates. Full article