Case Studies in Chemical and Environmental Engineering最新文献_第4页

Synthesis of dual-fiber cellulose aerogel from oil palm empty fruit bunch and banana petiole combined with graphene oxide for oil spill adsorption 以油棕空果束和香蕉叶柄为原料合成双纤维纤维素气凝胶，结合氧化石墨烯吸附溢油

Case Studies in Chemical and Environmental Engineering Pub Date : 2026-06-01 Epub Date: 2026-02-12 DOI: 10.1016/j.cscee.2026.101346

Maktum Muharja , Husnul Khotimah , Difka Augustina Diana Sari , Ika Putri Nikmatur Rohmah , Siska Nuri Fadilah , Candra Wijaya , Dendy Satrio

{"title":"Synthesis of dual-fiber cellulose aerogel from oil palm empty fruit bunch and banana petiole combined with graphene oxide for oil spill adsorption","authors":"Maktum Muharja , Husnul Khotimah , Difka Augustina Diana Sari , Ika Putri Nikmatur Rohmah , Siska Nuri Fadilah , Candra Wijaya , Dendy Satrio","doi":"10.1016/j.cscee.2026.101346","DOIUrl":"10.1016/j.cscee.2026.101346","url":null,"abstract":"<div><div>Oil spills remain a critical environmental challenge, necessitating sustainable, efficient, and economically viable adsorption materials. In this study, dual-fiber cellulose aerogels were synthesized from oil palm empty fruit bunches (OPEFB) and banana petiole fibers and reinforced with graphene oxide (GO) to enhance adsorption performance and mechanical stability. The aerogel with a 2:2 cellulose ratio exhibited the most favorable structure, with a low density of 0.031 g/cm<sup>3</sup>, high porosity of 0.982, and strong hydrophobicity indicated by a contact angle of 113.32°. GO incorporation significantly enhanced oil uptake, with the aerogel containing 80 mg/g GO achieving a maximum adsorption capacity of 5.4 g/g and maintaining stable performance over four reuse cycles. Adsorption kinetics were best described by the pseudo-second-order model (R<sup>2</sup> up to 0.966; k<sub>2</sub> up to 0.945 g/g·min), suggesting that chemisorption played a dominant role in the adsorption process. Mechanical performance was markedly improved by GO reinforcement, resulting in a bending strength of 178.44 MPa, approximately four times higher than that of the GO-free aerogel. Cost analysis indicated a production cost of US$ 0.452/g, which is comparable to previously reported cellulose-based aerogels. These results demonstrate the potential of dual-fiber cellulose/GO aerogels as scalable and mechanically robust materials for oil spill remediation.</div></div>","PeriodicalId":34388,"journal":{"name":"Case Studies in Chemical and Environmental Engineering","volume":"13 ","pages":"Article 101346"},"PeriodicalIF":0.0,"publicationDate":"2026-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147384804","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Synthesis and evaluation of a highly reusable MIL-101(Fe)/biochar adsorbent for efficient ammonium removal: Kinetic, isotherm, and thermodynamic insights 高度可重复使用的MIL-101(Fe)/生物炭吸附剂的合成和评价：动力学，等温线和热力学见解

Case Studies in Chemical and Environmental Engineering Pub Date : 2026-06-01 Epub Date: 2026-02-14 DOI: 10.1016/j.cscee.2026.101344

Khai Manh Nguyen , Huong-Tra Nguyen , Uyen Thi To Tran , Hang Thi Minh Tran , Dinh-Trinh Tran

{"title":"Synthesis and evaluation of a highly reusable MIL-101(Fe)/biochar adsorbent for efficient ammonium removal: Kinetic, isotherm, and thermodynamic insights","authors":"Khai Manh Nguyen , Huong-Tra Nguyen , Uyen Thi To Tran , Hang Thi Minh Tran , Dinh-Trinh Tran","doi":"10.1016/j.cscee.2026.101344","DOIUrl":"10.1016/j.cscee.2026.101344","url":null,"abstract":"<div><div>The remediation of ammonium contaminated water demands the development of high-performance and cost-effective adsorbents. Herein, we report the successful synthesis of a novel composite material, MIL-101(Fe)/biochar, produced through a simple, environmentally friendly combination of hydrothermal treatment and pyrolysis, and evaluate its efficacy for NH<sub>4</sub><sup>+</sup> removal. Characterization confirmed the successful synthesis of the composite, featuring MIL-101(Fe) octahedral particles uniformly distributed onto the biochar's honeycomb-like structure. The resulting MIL-101(Fe)/biochar adsorbent possessed a favorable mesoporous structure, with a specific surface area of 66.54 m<sup>2</sup>/g and a mean pore diameter of 3.35 nm. NH<sub>4</sub><sup>+</sup> adsorptive removal process was impacted by operating parameters (reaction time, temperature, pH value, adsorbent dose, and initial NH<sub>4</sub><sup>+</sup> content). Under optimal conditions (pH 7.0, 4 g/L adsorbent, 100 mg/L NH<sub>4</sub><sup>+</sup>, and 6 h), the material showed a maximum NH<sub>4</sub><sup>+</sup> uptake of 16.47 mg/g, surpassing several existing adsorbents. Kinetic, isotherm, and thermodynamic studies suggest that NH<sub>4</sub><sup>+</sup> adsorption process was spontaneous, endothermic, and governed by a combination of both physisorption and chemisorption. The adsorbent demonstrated very good stability and reusability, maintaining its high adsorption capacity after four treatment cycles, confirming its long-term viability. This research highlights MIL-101(Fe)/biochar adsorbent as a promising, effective, and sustainable alternative for practical removal of NH<sub>4</sub><sup>+</sup> from wastewater.</div></div>","PeriodicalId":34388,"journal":{"name":"Case Studies in Chemical and Environmental Engineering","volume":"13 ","pages":"Article 101344"},"PeriodicalIF":0.0,"publicationDate":"2026-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147384817","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Yeast-fermented spirulina as a functional feed additive: Impacts on growth efficiency and gut microbial diversity in native Indonesian ducks 酵母发酵螺旋藻作为功能性饲料添加剂：对印尼本地鸭生长效率和肠道微生物多样性的影响

Case Studies in Chemical and Environmental Engineering Pub Date : 2026-06-01 Epub Date: 2026-01-20 DOI: 10.1016/j.cscee.2026.101333

Amrih Prasetyo , Isyana Khaerunnisa , Fajrin Shidiq , Slamet Diah Volkandari , Aan Andri Yano , Mohammad Ikhsan Shiddieqy , Nurul Pratiwi , Dwi Lestari , Wawan Kuswandi , Mifta Pratiwi Rachman , Lilis Hartati , Nanung Agus Fitriyanto , Chusnul Hanim , Bambang Haryanto , Sugiharto Sugiharto

{"title":"Yeast-fermented spirulina as a functional feed additive: Impacts on growth efficiency and gut microbial diversity in native Indonesian ducks","authors":"Amrih Prasetyo , Isyana Khaerunnisa , Fajrin Shidiq , Slamet Diah Volkandari , Aan Andri Yano , Mohammad Ikhsan Shiddieqy , Nurul Pratiwi , Dwi Lestari , Wawan Kuswandi , Mifta Pratiwi Rachman , Lilis Hartati , Nanung Agus Fitriyanto , Chusnul Hanim , Bambang Haryanto , Sugiharto Sugiharto","doi":"10.1016/j.cscee.2026.101333","DOIUrl":"10.1016/j.cscee.2026.101333","url":null,"abstract":"<div><div>The effects of supplementing with fermented spirulina (<em>Arthrospira platensis</em>) on the small intestine microbiota of native Indonesian Magelang ducks were examined in this study. The primary objective of this study was to evaluate the effects of different levels of yeast-fermented Spirulina supplementation on the small intestinal microbiota of Indonesian Magelang ducks, while growth performance was assessed as a supporting parameter. The ducks were supplemented with 5 %, 10 %, or 15 % fermented spirulina, with a control group receiving no supplementation. The microbiome was described using 16S rRNA gene sequencing. The microbiome analysis revealed that supplementation significantly altered the microbial community, particularly increasing the population of <em>Cetobacterium somerae</em>, a beneficial bacterium known for its antiviral properties.</div></div>","PeriodicalId":34388,"journal":{"name":"Case Studies in Chemical and Environmental Engineering","volume":"13 ","pages":"Article 101333"},"PeriodicalIF":0.0,"publicationDate":"2026-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146077444","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Mitigating carbon emissions in a legacy spark-ignition engine via ammonia supplementation: An efficiency-NOx trade-off study 通过补充氨来减少传统火花点火发动机的碳排放：效率-氮氧化物权衡研究

Case Studies in Chemical and Environmental Engineering Pub Date : 2026-06-01 Epub Date: 2026-02-09 DOI: 10.1016/j.cscee.2026.101343

Niti Klinkaew , Anupap Pumpuang , Phakrob Silathong , Atthaphon Maneedaeng , Hendry Sakke Tira , Ekarong Sukjit

{"title":"Mitigating carbon emissions in a legacy spark-ignition engine via ammonia supplementation: An efficiency-NOx trade-off study","authors":"Niti Klinkaew , Anupap Pumpuang , Phakrob Silathong , Atthaphon Maneedaeng , Hendry Sakke Tira , Ekarong Sukjit","doi":"10.1016/j.cscee.2026.101343","DOIUrl":"10.1016/j.cscee.2026.101343","url":null,"abstract":"<div><div>Decarbonising the legacy fleet of internal combustion engines requires practical, cost-effective retrofit strategies. This study investigated utilising ammonia as a supplementary fuel in a 1.6-L port-fuel injection spark-ignition engine, representative of the vehicle population in Thailand. The engine operated on Gasohol 91 with ammonia energy shares of 10%–30% at 2500 rpm under varying loads (25%–75%). The investigation quantified trade-offs between performance, combustion stability, and exhaust emissions. Experimental results indicated a clear thermodynamic trade-off: while pure Gasohol 91 demonstrated superior brake thermal efficiency (BTE) due to its higher energy density, the efficiency penalty from ammonia significantly narrowed at high loads (75%) as elevated temperatures overcame ammonia's low reactivity. Environmentally, the 30% ammonia blend achieved the lowest levels of Carbon Monoxide (CO) and Unburned Hydrocarbons (HC). However, this benefit was counterbalanced by a surge in Nitrogen Oxides (NOx), primarily driven by the fuel-NOx mechanism. Furthermore, statistical analysis revealed a strong inverse correlation, where a 1% decrease in thermal efficiency corresponded to an approximate 3.16 ppm increase in NOx. The study concludes that ammonia fumigation is a viable decarbonisation strategy for legacy engines, particularly at medium-to-high loads, provided that the efficiency-NOx trade-off is managed through optimised operating strategies or after-treatment systems.</div></div>","PeriodicalId":34388,"journal":{"name":"Case Studies in Chemical and Environmental Engineering","volume":"13 ","pages":"Article 101343"},"PeriodicalIF":0.0,"publicationDate":"2026-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146173220","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Continuous-series microbial fuel cell for tofu liquid waste: effects of catholyte and inoculum 豆腐废液连续系列微生物燃料电池：阴极液和接种量的影响

Case Studies in Chemical and Environmental Engineering Pub Date : 2026-06-01 Epub Date: 2026-01-19 DOI: 10.1016/j.cscee.2026.101331

Sri Rachmania Juliastuti, Michellia Pramoryza, Raden Darmawan

{"title":"Continuous-series microbial fuel cell for tofu liquid waste: effects of catholyte and inoculum","authors":"Sri Rachmania Juliastuti, Michellia Pramoryza, Raden Darmawan","doi":"10.1016/j.cscee.2026.101331","DOIUrl":"10.1016/j.cscee.2026.101331","url":null,"abstract":"<div><div>This study investigates a continuous-series microbial fuel cell (MFC) with 50 % recycle for simultaneous tofu wastewater treatment and bioelectricity generation. A five-stack horizontal reactor was operated with three substrate–inoculum configurations (substrate only; substrate + Sidoarjo mud; substrate + Sidoarjo mud + <em>Bacillus subtilis</em>) and oxidizing catholytes (K<sub>2</sub>S<sub>2</sub>O<sub>8</sub> and KMnO<sub>4</sub> at 10–50 mM). System performance was evaluated using high-frequency monitoring (voltage, current, pH, temperature) and conventional wastewater parameters (biochemical oxygen demand/BOD, chemical oxygen demand/COD, protein degradation). The mixed inoculum (mud + <em>B. subtilis</em>) combined with 50mM K<sub>2</sub>S<sub>2</sub>O<sub>8</sub> produced the best overall performance, achieving the highest organic removal (79.01 % BOD removal, 86.67 % COD removal, and 81.7 % protein degradation) and highest electricity generation (4.378mW/m<sup>2</sup> power density) in 15 Days. Extended operation (45 days) confirmed improved stability and sustained treatment efficiency over time (95.22 % BOD removal, 92.60 % COD removal, and 79.38 % protein degradation, 15.808 mW/m<sup>2</sup> total power density). The results demonstrate the potential of combining inoculum synergy, catholyte selection, and continuous-series reactor design to enhance the performance of MFCs for high-strength, protein-rich industrial wastewater.</div></div>","PeriodicalId":34388,"journal":{"name":"Case Studies in Chemical and Environmental Engineering","volume":"13 ","pages":"Article 101331"},"PeriodicalIF":0.0,"publicationDate":"2026-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146022385","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Biosorption of pharmaceuticals to pyrolyzed Corbicula fluminea shells: the effect of pH under environmentally relevant conditions 生物吸附药物的裂解河蚌壳：在环境相关条件下pH值的影响

Case Studies in Chemical and Environmental Engineering Pub Date : 2026-06-01 Epub Date: 2026-05-26 DOI: 10.1016/j.cscee.2026.101413

Fátima Jesus , Érika M.L. Sousa , Gonçalo Abreu , Leandro Monteiro , Érica Pascoal , Joana Luísa Pereira , Vânia Calisto

{"title":"Biosorption of pharmaceuticals to pyrolyzed Corbicula fluminea shells: the effect of pH under environmentally relevant conditions","authors":"Fátima Jesus , Érika M.L. Sousa , Gonçalo Abreu , Leandro Monteiro , Érica Pascoal , Joana Luísa Pereira , Vânia Calisto","doi":"10.1016/j.cscee.2026.101413","DOIUrl":"10.1016/j.cscee.2026.101413","url":null,"abstract":"<div><div>This study aimed to assess the efficiency of shells from the invasive clam <em>Corbicula fluminea</em> for the removal of pharmaceuticals from different therapeutic classes from water. The removal efficiency was assessed at different but environmentally relevant pH values(6-9). The pyrolyzed material showed a point zero charge of 10 and a specific surface area of 0.94 m<sup>2</sup> g<sup>−1</sup>. For each compound, the removal efficiency varied no more than 20 % among the tested pH values, except for ibuprofen, with removal values varying between negligible (pH 9) and 58% ± 6% (pH 6). At pH 7, which is relevant for most urban wastewaters, the removal efficiency varied in the following order, under the tested conditions: diclofenac (80% ± 2%) > fluoxetine (67% ± 1%) > metformin (53% ± 3%) > caffeine (45% ± 8%) > carbamazepine (41% ± 5%) > ibuprofen (27% ± 5%) > paracetamol (23% ± 3%) > naproxen (13% ± 5%) > sulfamethoxazole (11% ± 2%). Given these results, allied to the ecological benefits of removing <em>C. fluminea</em> shells from invaded aquatic systems, the use of this biosorbent is potentially promising to improve strategies for the treatment of urban wastewaters.</div></div>","PeriodicalId":34388,"journal":{"name":"Case Studies in Chemical and Environmental Engineering","volume":"13 ","pages":"Article 101413"},"PeriodicalIF":0.0,"publicationDate":"2026-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148167951","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Integrated electrochemical–biological treatment for efficient removal of metformin and its by-products: Optimization, mineralization, and toxicity assessment 高效去除二甲双胍及其副产物的综合电化学-生物处理：优化、矿化和毒性评估

Case Studies in Chemical and Environmental Engineering Pub Date : 2026-06-01 Epub Date: 2026-01-10 DOI: 10.1016/j.cscee.2026.101322

Mohammad Mohammad Hosseini , Melika Solouki , Zahra Ghobadi-Nejad , Soheila Yaghmaei

{"title":"Integrated electrochemical–biological treatment for efficient removal of metformin and its by-products: Optimization, mineralization, and toxicity assessment","authors":"Mohammad Mohammad Hosseini , Melika Solouki , Zahra Ghobadi-Nejad , Soheila Yaghmaei","doi":"10.1016/j.cscee.2026.101322","DOIUrl":"10.1016/j.cscee.2026.101322","url":null,"abstract":"<div><div>Metformin is one of the most used pharmaceuticals, and its transformation products frequently appear in elevated concentrations within aquatic environments, where they may pose toxicity risks to non-target organisms. This study combines electrochemical and biological treatments to improve the removal of metformin and its associated by-products. The electrochemical process achieved 97.98 % removal within 60 min, and the treated effluent was subsequently introduced into a biological system to target remaining intermediates, including dimethyl formamide, which was reduced by up to 95 % within five days. Scavenger tests and photoluminescence analysis confirmed the central role of hydroxyl radicals in pollutant degradation. Enzyme activity measurements, including naphthalene dioxygenase and laccase, suggested their involvement in the biodegradation mechanism. Operational variables were optimized using Response Surface Methodology, and the energy consumption required for complete electrochemical decomposition of metformin was 1.33 kWh/m<sup>3</sup>. Following electrochemical treatment, TOC and COD removals were 48 % and 55 %, respectively, and these values increased to 90 % and 95 % after the combined process. Additional experiments assessed metformin removal in different water matrices and evaluated phytotoxicity to verify the effectiveness of the integrated system. Finally, the degradation pathway of metformin within the combined treatment system is presented in this integrated treatment study.</div></div>","PeriodicalId":34388,"journal":{"name":"Case Studies in Chemical and Environmental Engineering","volume":"13 ","pages":"Article 101322"},"PeriodicalIF":0.0,"publicationDate":"2026-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146077446","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Comparative assessment of chemical looping assisted biomass gasification for H2 production: A Thermochemical, Exergy, and Environmental Perspective 化学环辅助生物质气化H2生产的比较评估：热化学，能源和环境的观点

Case Studies in Chemical and Environmental Engineering Pub Date : 2026-06-01 Epub Date: 2026-01-27 DOI: 10.1016/j.cscee.2026.101336

Rakib bin Nasir , Tae Jin Kang , Souman Rudra

{"title":"Comparative assessment of chemical looping assisted biomass gasification for H2 production: A Thermochemical, Exergy, and Environmental Perspective","authors":"Rakib bin Nasir , Tae Jin Kang , Souman Rudra","doi":"10.1016/j.cscee.2026.101336","DOIUrl":"10.1016/j.cscee.2026.101336","url":null,"abstract":"<div><div>This study conducts a comparative simulation of chemical looping-assisted biomass gasification for hydrogen-rich syngas production using Aspen Plus and HYSYS. Three biomass types (wood, industrial bark of <em>Picea abies</em>, Norway spruce), gasifying agents (steam, air), and oxygen carriers (Fe<sub>2</sub>O<sub>3</sub>, FeTiO<sub>3</sub>) were assessed under twelve cases. Steam gasification significantly enhanced H<sub>2</sub> yield and efficiency, while air gasification led to higher CO<sub>2</sub> emissions. Energy, exergy, and environmental analyses highlight steam-based configurations as superior, confirming their promise for efficient, low-carbon hydrogen production.Bark-based configurations (Cases 5–8) show higher efficiencies (38.5–39.15 %) than wood-based systems (31.24–31.82 %) despite the lower heating value of bark, while steam-based chemical looping results in lower GWP, reaching minimum values of about 6130 kg CO<sub>2</sub>-eq/h. Techno-economic analysis indicates similar capital costs across all cases (∼11.27–11.32 million USD), with operating costs governing the hydrogen production cost, which varies between 0.90 and 1.08 USD/kg H<sub>2</sub> and is lowest for Fe<sub>2</sub>O<sub>3</sub>-based systems. The novelty of this work lies in the systematic comparison of steam- and air-based chemical looping gasification for underexplored biomass feedstocks under identical operating conditions, supported by integrated energy, exergy, environmental, and techno-economic analyses, highlighting industrial bark as a promising feedstock for low-carbon hydrogen production.</div></div>","PeriodicalId":34388,"journal":{"name":"Case Studies in Chemical and Environmental Engineering","volume":"13 ","pages":"Article 101336"},"PeriodicalIF":0.0,"publicationDate":"2026-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146173224","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Investigating the status of biogas systems, digestate utilization practices, and key technological challenges among rural households in the Gedeo Zone, Ethiopia 调查埃塞俄比亚Gedeo地区农村家庭的沼气系统状况、沼地利用实践和关键技术挑战

Case Studies in Chemical and Environmental Engineering Pub Date : 2026-06-01 Epub Date: 2026-02-28 DOI: 10.1016/j.cscee.2026.101359

Workineh Mengesha Fereja , Gezahegn Kebede Beyene , Habtamu Temesgen

{"title":"Investigating the status of biogas systems, digestate utilization practices, and key technological challenges among rural households in the Gedeo Zone, Ethiopia","authors":"Workineh Mengesha Fereja , Gezahegn Kebede Beyene , Habtamu Temesgen","doi":"10.1016/j.cscee.2026.101359","DOIUrl":"10.1016/j.cscee.2026.101359","url":null,"abstract":"<div><div>The rising global demand for fossil fuels, declining oil reserves, and environmental degradation underscore the urgent need for sustainable energy solutions within circular economy framework. Anaerobic digestion (AD) offers a viable alternative by generating renewable biogas and organic fertilizer while reducing organic waste. Ethiopia possesses substantial untapped biomass resources, offering significant potential for rural AD adoption. This study evaluates the status of biogas systems, digestate utilization practice, and key technological challenges among rural households in the Gedeo Zone, Ethiopia. Data were collected from 29 AD-using households through intigrated qualitative and quantitative survey methods. The findings show that AD systems contribute to renewable energy production, sustainable agriculture practices, and climate change mitigation by reduced greenhouse gas emissions. However, system performance is constrained by several actors, including users’ socioeconomic conditions, poor installation quality, low-quality feedstock, limited technical skills in operation and maintenance, financial constraints, and weak user motivation. The availability of alternative energy sources and limited experience sharing among users further hinder adoption and optimal system performance. To enhance sustainability and scalability, the study recommends promoting multi-substrate feedstock utilization to optimized carbon-to-nitrogen ratios, providing continuous technical training, fostering positive community attitudes toward AD systems, and strengthening the capacity of skilled personnel.</div></div>","PeriodicalId":34388,"journal":{"name":"Case Studies in Chemical and Environmental Engineering","volume":"13 ","pages":"Article 101359"},"PeriodicalIF":0.0,"publicationDate":"2026-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147384597","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Evaluation of antifouling paint particles and plastic in the port of Callao-Peru 秘鲁卡亚俄港防污涂料颗粒和塑料的评价

Case Studies in Chemical and Environmental Engineering Pub Date : 2026-06-01 Epub Date: 2025-12-31 DOI: 10.1016/j.cscee.2025.101317

Lorgio Valdiviezo-Gonzales , Gabriel De-la-Torre , Fernando García Avila

{"title":"Evaluation of antifouling paint particles and plastic in the port of Callao-Peru","authors":"Lorgio Valdiviezo-Gonzales , Gabriel De-la-Torre , Fernando García Avila","doi":"10.1016/j.cscee.2025.101317","DOIUrl":"10.1016/j.cscee.2025.101317","url":null,"abstract":"<div><div>Antifouling paint particles (APPs) are an emerging but poorly characterized component of particulate contamination in port environments, particularly in the Global South. This study presents the first sediment-based assessment of APPs in the Port of Callao, Peru, one of the most active and industrialized ports in the southeast Pacific. Surface sediment samples were collected across functionally distinct port zones associated with shipyard operations, fueling of small vessels, commercial shipping, fishing activities, and recreational use. APPs and plastic particles larger than 500 μm were isolated, morphologically characterized, and chemically identified using Fourier transform infrared spectroscopy and energy-dispersive X-ray spectroscopy. APPs were detected at all sites, with concentrations ranging from 11.7 to 4725 μg g<sup>−1</sup>, and the highest loads were observed near the shipyard and fueling areas, indicating that maintenance-related activities were the dominant sources. APPs exhibited a flake-like, brittle morphology and were enriched in metal-based pigments, whereas polyethylene and polypropylene fragments and fibers predominated among plastics. The co-occurrence of APPs and plastics highlights port sediments as sinks for mixed particulate contaminants linked to maritime activities. Although sediment normalization parameters were not assessed, the results provide a baseline dataset for the region and offer conceptual insight into how port zoning and activity types influence APP accumulation. The findings suggest the need to improve the management of hull-cleaning practices and the routine monitoring of paint-derived particles in port environments.</div></div>","PeriodicalId":34388,"journal":{"name":"Case Studies in Chemical and Environmental Engineering","volume":"13 ","pages":"Article 101317"},"PeriodicalIF":0.0,"publicationDate":"2026-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145925617","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0