Case Studies in Chemical and Environmental Engineering最新文献

英文中文

Hydrogen peroxide-based oxidation and pH-controlled precipitation for the recovery of non-cerium rare earth elements from permanent magnet waste 以过氧化氢为基础的氧化- ph控制沉淀法从永磁体废料中回收非铈稀土元素

Q1 Environmental Science

Case Studies in Chemical and Environmental Engineering

Pub Date : 2025-12-13 DOI: 10.1016/j.cscee.2025.101307

Jose Luis Aldana, Jokin Hidalgo, Carmen del Rio, Javier Antoñanzas

This case study presents a sustainable and scalable process for the recovery of non-cerium rare earth elements (non-Ce REE) from end-of-life neodymium–iron–boron (NdFeB) permanent magnets. The method involves the selective precipitation of cerium using hydrogen peroxide at pH 5.5 and a NaOH/REE weight ratio between 0.41 and 0.45. Under these conditions, cerium was effectively removed from the leachate with a precipitation yield exceeding 99 wt%. The resulting cerium-based precipitate was calcined at 900 °C, and subsequent leaching in 1 M HCl enabled the recovery of non-Ce REE, including neodymium, praseodymium, gadolinium and dysprosium, with a maximum recovery rate of 97.9 wt%. The cerium content in the final product was controlled between 0.07 wt% and 2.1 wt% by adjusting the precipitation temperature, allowing for the production of two distinct rare earth oxide streams. The process was validated using real leachates obtained from the recycling of industrial magnet waste, demonstrating its applicability in real-world scenarios. The use of environmentally benign reagents and well-established unit operations supports the industrial feasibility and environmental sustainability of the proposed method. The results highlight the potential of this approach for the recovery of critical raw materials in line with circular economy and decarbonisation goals, offering a viable solution for the sustainable management of rare earth resources in industrial recycling contexts.

本案例研究提出了一种从报废的钕铁硼永磁体中回收非铈稀土元素（non-Ce REE）的可持续和可扩展的工艺。该方法使用过氧化氢在pH 5.5， NaOH/REE重量比在0.41 ~ 0.45之间选择性沉淀铈。在此条件下，铈能有效地从渗滤液中去除，沉淀率超过99%。得到的铈基沉淀物在900℃下煅烧，随后在1 M HCl中浸出，可以回收非ce REE，包括钕、镨、钆和镝，最大回收率为97.9%。通过调节沉淀温度，最终产品中的铈含量控制在0.07 wt% ~ 2.1 wt%之间，从而产生两种不同的稀土氧化物流。利用回收工业磁铁废弃物获得的真实渗滤液对该工艺进行了验证，证明了其在现实场景中的适用性。使用环境友好的试剂和完善的单元操作支持工业可行性和环境可持续性提出的方法。研究结果突出了这种方法在回收关键原材料方面的潜力，符合循环经济和脱碳目标，为工业回收环境下稀土资源的可持续管理提供了可行的解决方案。

{"title":"Hydrogen peroxide-based oxidation and pH-controlled precipitation for the recovery of non-cerium rare earth elements from permanent magnet waste","authors":"Jose Luis Aldana, Jokin Hidalgo, Carmen del Rio, Javier Antoñanzas","doi":"10.1016/j.cscee.2025.101307","DOIUrl":"10.1016/j.cscee.2025.101307","url":null,"abstract":"<div><div>This case study presents a sustainable and scalable process for the recovery of non-cerium rare earth elements (non-Ce REE) from end-of-life neodymium–iron–boron (NdFeB) permanent magnets. The method involves the selective precipitation of cerium using hydrogen peroxide at pH 5.5 and a NaOH/REE weight ratio between 0.41 and 0.45. Under these conditions, cerium was effectively removed from the leachate with a precipitation yield exceeding 99 wt%. The resulting cerium-based precipitate was calcined at 900 °C, and subsequent leaching in 1 M HCl enabled the recovery of non-Ce REE, including neodymium, praseodymium, gadolinium and dysprosium, with a maximum recovery rate of 97.9 wt%. The cerium content in the final product was controlled between 0.07 wt% and 2.1 wt% by adjusting the precipitation temperature, allowing for the production of two distinct rare earth oxide streams. The process was validated using real leachates obtained from the recycling of industrial magnet waste, demonstrating its applicability in real-world scenarios. The use of environmentally benign reagents and well-established unit operations supports the industrial feasibility and environmental sustainability of the proposed method. The results highlight the potential of this approach for the recovery of critical raw materials in line with circular economy and decarbonisation goals, offering a viable solution for the sustainable management of rare earth resources in industrial recycling contexts.</div></div>","PeriodicalId":34388,"journal":{"name":"Case Studies in Chemical and Environmental Engineering","volume":"13 ","pages":"Article 101307"},"PeriodicalIF":0.0,"publicationDate":"2025-12-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145790615","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 gasification-pyrolysis of fresh palm fruit bunches for biochar production and carbon sequestration 新鲜棕榈果束的连续气化热解生产生物炭和固碳

Q1 Environmental Science

Case Studies in Chemical and Environmental Engineering

Pub Date : 2025-12-09 DOI: 10.1016/j.cscee.2025.101309

Nathawat Unsomsri , Pachara Koedthong , Sittinun Tawkaew , Songkran Wiriyasart , Sommas Kaewluan

The growing need for sustainable alternatives to fossil-derived heating motivates the development of biomass-based thermal systems for waste valorization. This study designed and operated a continuous pyrolysis system integrated with an updraft gasifier-syngas burner, using wood pellets as a renewable heat source to convert fresh palm fruit bunches (FFB) into valuable bio-products. The system replaced LPG heating, enabled direct utilization of undried FFB, and enhanced operational scalability. Stable operation was achieved at 1078 °C with low CO (280 mg Nm⁻³) and particulate emissions (56 mg Nm⁻³). Pyrolysis at 500 °C yielded biochar (9.5 wt%, HHV 28.1 MJ kg⁻¹, with 23 % carbon retention equivalent to 44.7 tCO₂eq yr⁻¹), pyrolysis oil (21.9 wt%), wood vinegar (40.0 wt%), and gases (28.6 wt%). Techno-economic analysis indicated a net profit of 4.08 EUR h⁻¹ and a short payback period of 1.5–1.9 years. These findings demonstrate that the integrated biomass gasification-pyrolysis system offers a technically feasible and economically attractive solution for low-carbon conversion of palm residues into energy and carbon-rich materials.

日益增长的需求可持续替代化石来源的加热激励了基于生物质的热系统的发展，用于废物增值。本研究设计并运行了一个集成了上升气流气化炉-合成气燃烧器的连续热解系统，利用木屑颗粒作为可再生热源，将新鲜棕榈果束（FFB）转化为有价值的生物产品。该系统取代了LPG加热，可以直接利用未干燥的FFB，并提高了操作的可扩展性。在1078°C下稳定运行，低CO （280 mg Nm - 3）和颗粒排放（56 mg Nm - 3）。500°C热解产生生物炭（9.5 wt%, HHV 28.1 MJ kg - 1, 23%的碳保留率相当于44.7 tCO2eq yr - 1）、热解油（21.9 wt%）、木醋（40.0 wt%）和气体（28.6 wt%）。技术经济分析表明，净利润为4.08欧元/小时，投资回收期较短，为1.5-1.9年。这些发现表明，生物质气化-热解一体化系统为棕榈渣低碳转化为能源和富含碳的材料提供了技术上可行和经济上有吸引力的解决方案。

{"title":"Continuous gasification-pyrolysis of fresh palm fruit bunches for biochar production and carbon sequestration","authors":"Nathawat Unsomsri , Pachara Koedthong , Sittinun Tawkaew , Songkran Wiriyasart , Sommas Kaewluan","doi":"10.1016/j.cscee.2025.101309","DOIUrl":"10.1016/j.cscee.2025.101309","url":null,"abstract":"<div><div>The growing need for sustainable alternatives to fossil-derived heating motivates the development of biomass-based thermal systems for waste valorization. This study designed and operated a continuous pyrolysis system integrated with an updraft gasifier-syngas burner, using wood pellets as a renewable heat source to convert fresh palm fruit bunches (FFB) into valuable bio-products. The system replaced LPG heating, enabled direct utilization of undried FFB, and enhanced operational scalability. Stable operation was achieved at 1078 °C with low CO (280 mg Nm<sup>−3</sup>) and particulate emissions (56 mg Nm<sup>−3</sup>). Pyrolysis at 500 °C yielded biochar (9.5 wt%, HHV 28.1 MJ kg<sup>−1</sup>, with 23 % carbon retention equivalent to 44.7 tCO<sub>2</sub>eq yr<sup>−1</sup>), pyrolysis oil (21.9 wt%), wood vinegar (40.0 wt%), and gases (28.6 wt%). Techno-economic analysis indicated a net profit of 4.08 EUR h<sup>−1</sup> and a short payback period of 1.5–1.9 years. These findings demonstrate that the integrated biomass gasification-pyrolysis system offers a technically feasible and economically attractive solution for low-carbon conversion of palm residues into energy and carbon-rich materials.</div></div>","PeriodicalId":34388,"journal":{"name":"Case Studies in Chemical and Environmental Engineering","volume":"13 ","pages":"Article 101309"},"PeriodicalIF":0.0,"publicationDate":"2025-12-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145737497","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 of industrial waste-based geopolymer catalyst and its application in removing imidacloprid insecticide from water 工业废渣基地聚合物催化剂的合成及其在水中吡虫啉脱除中的应用

Q1 Environmental Science

Case Studies in Chemical and Environmental Engineering

Pub Date : 2025-12-07 DOI: 10.1016/j.cscee.2025.101308

Samunya Sanguanpak , Premmanus Chittachumnonk , Chart Chiemchaisri , Ming Chun Lu

Geopolymer granules containing fly ash as aluminosilicate materials and mill scale as a catalyst were applied for photocatalytic degradation of imidacloprid insecticide. The surface properties of the geopolymer catalyst were optimized by providing an optimum ratio of waste materials and pore-forming agents. The geopolymer catalyst yielded complete imidacloprid removals during batch experiments, with more than 80 % of its removals taking place after only 1 h of UV exposure. High photocatalytic activities were maintained over 10 repetitive cycles, exhibiting its longevity during which a gradual release of sediment with higher photocatalytic activities was observed, thus increasing its overall photocatalytic degradation rate of the geopolymer catalyst.

以粉煤灰为硅酸铝材料，磨渣为催化剂的地聚合物颗粒进行了吡虫啉杀虫剂光催化降解研究。通过提供最佳配比的废料和成孔剂，优化了地聚合物催化剂的表面性能。在批量实验中，地聚合物催化剂产生了完全去除吡虫啉的效果，在紫外线照射1小时后，80%以上的吡虫啉被去除。在10个重复循环中保持较高的光催化活性，表现出较长的寿命，在此期间观察到具有较高光催化活性的沉积物逐渐释放，从而提高了其对地聚合物催化剂的总体光催化降解率。

引用次数: 0

Synthesis of Fe-, Co-doped TiO2/vermiculite for enhanced antibiotic adsorption and photocatalytic degradation 铁、共掺杂TiO2/蛭石的合成及其增强抗生素吸附和光催化降解

Q1 Environmental Science

Case Studies in Chemical and Environmental Engineering

Pub Date : 2025-12-04 DOI: 10.1016/j.cscee.2025.101305

Vu Van Tu , Nguyen Thi Hue , Hoang Minh Thang , Nguyen Duc Van , Tran Van An , Dinh-Trinh Tran , Nguyen Thi Thanh Hai

Herein, Fe-, Co-doped TiO₂ semiconductors dispersed on acid-modified vermiculite were successfully synthesized using sol-gel method. The photocatalytic activity and adsorption capacity of Fe-, Co-doped TiO₂ catalysts were evaluated through the removal of ciprofloxacin antibiotic in water. Fe-, Co-doped TiO₂/Vermiculite (Ver) were mesoporous materials with specific surface areas of 162.7 m²/g (Fe-doped TiO₂), and 172.7 m²/g (Co-doped TiO₂/Ver). The combination between Fe-, Co-doped TiO₂ and Ver resulted in an improved visible light absorption, with band gap energy decreasing from 3.31 eV (TiO₂), to 2.02 eV (Fe-doped TiO₂), and 1.79 eV (Co-doped TiO₂), enhancing the photocatalytic performance and absorption capacity. The Fe-, Co-doped TiO₂/Ver achieved 96.1 % of ciprofloxacin (50 mg/L) removal by photocatalytic process. Anions inhibited photocatalytic activity with the following order Cl⁻ > H₂PO₄⁻ > I⁻, while HO^• and h⁺ were primary reactive species generated. Adsorption process followed the Freundlich isotherm (R² > 0.99) and pseudo-second-order kinetics (R² > 0.98), suggesting the involvement of physico-chemical adsorption processes. The photodegradation process adhered to pseudo-first-order kinetics, with a maximum rate constant of 0.43 min⁻¹. Co-, Fe-doped TiO₂/Ver maintained good ciprofloxacin removal efficiencies after three reused cycles, demonstrating its high stability. This study presents a promising approach for removing antibiotic residues from water.

本文采用溶胶-凝胶法制备了分散在酸修饰蛭石上的Fe- co掺杂TiO2半导体。通过对水中环丙沙星抗生素的去除，评价了Fe-、共掺杂TiO2催化剂的光催化活性和吸附能力。Fe-、co掺杂TiO2/Vermiculite （Ver）为介孔材料，比表面积分别为162.7 m2/g （Fe掺杂TiO2）和172.7 m2/g （co掺杂TiO2/Ver）。Fe-、共掺杂TiO2和Ver的结合改善了可见光吸收，带隙能量从3.31 eV （TiO2）降低到2.02 eV （Fe-掺杂TiO2）和1.79 eV (co -掺杂TiO2)，增强了光催化性能和吸收能力。Fe- co掺杂TiO2/Ver光催化对环丙沙星（50 mg/L）的去除率达到96.1%。阴离子抑制光催化活性的顺序为Cl−>； H2PO4−> I−，而HO•和h+是主要的活性物质。吸附过程遵循Freundlich等温线（R2 > 0.99）和拟二级动力学（R2 > 0.98），表明参与了物理化学吸附过程。光降解过程符合准一级动力学，最大速率常数为0.43 min−1。Co-， fe掺杂的TiO2/Ver经过三次重复使用后仍保持良好的环丙沙星去除率，表现出较高的稳定性。本研究提出了一种有前途的去除水中抗生素残留的方法。

{"title":"Synthesis of Fe-, Co-doped TiO2/vermiculite for enhanced antibiotic adsorption and photocatalytic degradation","authors":"Vu Van Tu , Nguyen Thi Hue , Hoang Minh Thang , Nguyen Duc Van , Tran Van An , Dinh-Trinh Tran , Nguyen Thi Thanh Hai","doi":"10.1016/j.cscee.2025.101305","DOIUrl":"10.1016/j.cscee.2025.101305","url":null,"abstract":"<div><div>Herein, Fe-, Co-doped TiO<sub>2</sub> semiconductors dispersed on acid-modified vermiculite were successfully synthesized using sol-gel method. The photocatalytic activity and adsorption capacity of Fe-, Co-doped TiO<sub>2</sub> catalysts were evaluated through the removal of ciprofloxacin antibiotic in water. Fe-, Co-doped TiO<sub>2</sub>/Vermiculite (Ver) were mesoporous materials with specific surface areas of 162.7 m<sup>2</sup>/g (Fe-doped TiO<sub>2</sub>), and 172.7 m<sup>2</sup>/g (Co-doped TiO<sub>2</sub>/Ver). The combination between Fe-, Co-doped TiO<sub>2</sub> and Ver resulted in an improved visible light absorption, with band gap energy decreasing from 3.31 eV (TiO<sub>2</sub>), to 2.02 eV (Fe-doped TiO<sub>2</sub>), and 1.79 eV (Co-doped TiO<sub>2</sub>), enhancing the photocatalytic performance and absorption capacity. The Fe-, Co-doped TiO<sub>2</sub>/Ver achieved 96.1 % of ciprofloxacin (50 mg/L) removal by photocatalytic process. Anions inhibited photocatalytic activity with the following order Cl<sup>−</sup> > H<sub>2</sub>PO<sub>4</sub><sup>−</sup> > I<sup>−</sup>, while HO<sup>•</sup> and h<sup>+</sup> were primary reactive species generated. Adsorption process followed the Freundlich isotherm (R<sup>2</sup> > 0.99) and pseudo-second-order kinetics (R<sup>2</sup> > 0.98), suggesting the involvement of physico-chemical adsorption processes. The photodegradation process adhered to pseudo-first-order kinetics, with a maximum rate constant of 0.43 min<sup>−1</sup>. Co-, Fe-doped TiO<sub>2</sub>/Ver maintained good ciprofloxacin removal efficiencies after three reused cycles, demonstrating its high stability. This study presents a promising approach for removing antibiotic residues from water.</div></div>","PeriodicalId":34388,"journal":{"name":"Case Studies in Chemical and Environmental Engineering","volume":"13 ","pages":"Article 101305"},"PeriodicalIF":0.0,"publicationDate":"2025-12-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145737499","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

Reverse osmosis treatment of blow-down water for beneficial reuse and sustainable power generation 对排污水进行反渗透处理，有利于回用和可持续发电

Q1 Environmental Science

Case Studies in Chemical and Environmental Engineering

Pub Date : 2025-12-03 DOI: 10.1016/j.cscee.2025.101306

Claudio Kohn , Hung Cong Duong , Viet Quang Ly , Long Duc Nghiem

Reverse osmosis (RO) has been widely adopted for the treatment of blow-down water to facilitate sustainable water management in thermal power plants. This study investigates membrane fouling in a packaged RO system treating blow-down water to identify the causes of permeate flux decline and develop mitigation strategies. Results from blow-down water analysis, autopsy of the used membrane, and filtration experiments indicate that the RO system was likely under-designed with water recovery exceeding the design limit, creating conditions favourable for flux deterioration. Silica, present in blow-down water at high concentrations (∼50 mg/L), was identified as the dominant and most challenging membrane fouling culprit. Given the sulphate concentrations of 55–88 mg/L, barium sulphate scaling might also occur; however, the evidence was inconclusive. Unlike silica scaling, barium sulphate could be mitigated through appropriate anti-scalant dosing. The filtration experiments indicate that besides fouling, membrane compaction partially contributed to flux decline. Finally, WAVE simulation results suggest key strategies (e.g. lower water recovery, using larger membrane surface area or membrane with improved flux stability, increasing feed water temperature (up to 35 °C), blending with silica-free water sources, and optimising anti-scalant dosing) to enhance RO system water recovery while effectively avert membrane fouling.

反渗透（RO）技术已被广泛应用于火电厂排污水的处理，以促进火电厂水的可持续管理。本研究调查了袋装反渗透系统处理排污水中的膜污染，以确定渗透通量下降的原因并制定缓解策略。排污水分析、废膜解剖和过滤实验的结果表明，反渗透系统可能设计不足，水回收率超过了设计极限，为通量恶化创造了有利条件。二氧化硅，以高浓度（~ 50 mg/L）存在于排污水中，被确定为主要和最具挑战性的膜污染罪魁祸首。当硫酸盐浓度为55 ~ 88 mg/L时，也可能发生硫酸钡结垢；然而，证据是不确定的。不像二氧化硅结垢，硫酸钡可以通过适当的抗结垢剂剂量减轻。过滤实验表明，除污染外，膜压实也是导致通量下降的部分原因。最后，WAVE模拟结果提出了提高反渗透系统水回收率的关键策略（例如，降低水回收率，使用更大的膜表面积或提高通量稳定性的膜，提高给水温度（高达35°C），与无硅水源混合，以及优化抗垢剂剂量），同时有效避免膜污染。

{"title":"Reverse osmosis treatment of blow-down water for beneficial reuse and sustainable power generation","authors":"Claudio Kohn , Hung Cong Duong , Viet Quang Ly , Long Duc Nghiem","doi":"10.1016/j.cscee.2025.101306","DOIUrl":"10.1016/j.cscee.2025.101306","url":null,"abstract":"<div><div>Reverse osmosis (RO) has been widely adopted for the treatment of blow-down water to facilitate sustainable water management in thermal power plants. This study investigates membrane fouling in a packaged RO system treating blow-down water to identify the causes of permeate flux decline and develop mitigation strategies. Results from blow-down water analysis, autopsy of the used membrane, and filtration experiments indicate that the RO system was likely under-designed with water recovery exceeding the design limit, creating conditions favourable for flux deterioration. Silica, present in blow-down water at high concentrations (∼50 mg/L), was identified as the dominant and most challenging membrane fouling culprit. Given the sulphate concentrations of 55–88 mg/L, barium sulphate scaling might also occur; however, the evidence was inconclusive. Unlike silica scaling, barium sulphate could be mitigated through appropriate anti-scalant dosing. The filtration experiments indicate that besides fouling, membrane compaction partially contributed to flux decline. Finally, WAVE simulation results suggest key strategies (e.g. lower water recovery, using larger membrane surface area or membrane with improved flux stability, increasing feed water temperature (up to 35 °C), blending with silica-free water sources, and optimising anti-scalant dosing) to enhance RO system water recovery while effectively avert membrane fouling.</div></div>","PeriodicalId":34388,"journal":{"name":"Case Studies in Chemical and Environmental Engineering","volume":"13 ","pages":"Article 101306"},"PeriodicalIF":0.0,"publicationDate":"2025-12-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145683120","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

Retraction notice to “Investigation of effective parameters in the production of alumina gel through the sol-gel method” [Case Stud. Chem. Environ. Eng. 8 (2023) 100405] 对“溶胶-凝胶法生产氧化铝凝胶的有效参数研究”的撤回通知[案例螺柱]。化学。环绕。工程8 (2023)100405]

Q1 Environmental Science

Case Studies in Chemical and Environmental Engineering

Pub Date : 2025-12-01 DOI: 10.1016/j.cscee.2025.101298

Rusul Alabada , Mustafa M. Kadhim , Zainab sabri Abbas , Ahmed Mahdi Rheima , Usama S. Altimari , Ashour H. Dawood , Alaa dhari jawad al-bayati , Zainab Talib Abed , Rusul Saeed Radhi , Asala Salam Jaber , Safa K. Hachim , Farah K. Ali , Zaid H. Mahmoud , Ehsan Kianfar

引用次数: 0

Retraction notice to “Assessment the potential solar energy with the models for optimum tilt angles of maximum solar irradiance for Iraq” [Case Stud. Chem. Environ. Eng. 4 (2021) 100140] 对“利用伊拉克最大太阳辐照度最佳倾斜角模型评估潜在太阳能”的撤回通知[案例编号]。化学。环绕。工程4 (2021)100140]

Q1 Environmental Science

Case Studies in Chemical and Environmental Engineering

Pub Date : 2025-12-01 DOI: 10.1016/j.cscee.2025.101112

Qusay Hassan , Majid K. Abbas , Ammar M. Abdulateef , Jasim Abdulateef , Abdulmajeed Mohamad

This article has been retracted: please see Elsevier Policy on Article Withdrawal (https://www.elsevier.com/locate/withdrawalpolicy).

This article has been retracted at the request of the Editor-in-Chief.

In investigating concerns regarding late-stage authorship changes to this article, the editors reached out to the authors for an explanation. In addition to the concerns regarding the late-stage authorship change the editors were unable to verify the contribution of the added author and the author responses were unsatisfactory.

Majid K. Abbas was added to this article in revision 3. This change was made without explanation and without exceptional approval by the handling Editor, which is contrary to the journal policy on changes to authorship. The editor therefore feels that the findings of the manuscript cannot be relied upon and that the article needs to be retracted.

本文已被撤回：请参见爱思唯尔文章撤回政策（https://www.elsevier.com/locate/withdrawalpolicy）.This)，文章已应主编要求撤回。在调查这篇文章后期作者身份变更的问题时，编辑向作者寻求解释。除了对后期作者身份变更的担忧之外，编辑们无法核实新增作者的贡献，作者的回答也不令人满意。Majid K. Abbas在第三修订版中加入了这篇文章。这一改变是在没有解释的情况下进行的，也没有得到处理编辑的特别批准，这违反了期刊关于作者身份改变的政策。因此，编辑认为手稿的发现不可靠，文章需要撤回。

{"title":"Retraction notice to “Assessment the potential solar energy with the models for optimum tilt angles of maximum solar irradiance for Iraq” [Case Stud. Chem. Environ. Eng. 4 (2021) 100140]","authors":"Qusay Hassan , Majid K. Abbas , Ammar M. Abdulateef , Jasim Abdulateef , Abdulmajeed Mohamad","doi":"10.1016/j.cscee.2025.101112","DOIUrl":"10.1016/j.cscee.2025.101112","url":null,"abstract":"<div><div>This article has been retracted: please see Elsevier Policy on Article Withdrawal (<span><span>https://www.elsevier.com/locate/withdrawalpolicy</span><svg><path></path></svg></span>).</div><div>This article has been retracted at the request of the Editor-in-Chief.</div><div>In investigating concerns regarding late-stage authorship changes to this article, the editors reached out to the authors for an explanation. In addition to the concerns regarding the late-stage authorship change the editors were unable to verify the contribution of the added author and the author responses were unsatisfactory.</div><div>Majid K. Abbas was added to this article in revision 3. This change was made without explanation and without exceptional approval by the handling Editor, which is contrary to the journal policy on changes to authorship. The editor therefore feels that the findings of the manuscript cannot be relied upon and that the article needs to be retracted.</div></div>","PeriodicalId":34388,"journal":{"name":"Case Studies in Chemical and Environmental Engineering","volume":"12 ","pages":"Article 101112"},"PeriodicalIF":0.0,"publicationDate":"2025-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145614583","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

Groundwater hydrochemistry and identification of nitrate pollution sources in the Ouémé Delta (Southern-Benin) using dual isotopes (15N–NO3 and 18O–NO3) and a Bayesian isotope mixing model 基于双同位素（15N-NO3和18O-NO3）和贝叶斯同位素混合模型的南贝宁乌姆萨梅斯三角洲地下水水化学及硝酸盐污染源识别

Q1 Environmental Science

Case Studies in Chemical and Environmental Engineering

Pub Date : 2025-11-28 DOI: 10.1016/j.cscee.2025.101303

Aoulatou Alassane Zakari , Kodjo Apelete Raoul Kpegli , Dadja-Toyou Masamaéya Gnazou , Abdoukarim Alassane , Bio Guidah Chabi , Fabrice Messan Amene Lawson , Nicaise Yalo , Daouda Mama , Moussa Boukari

The watershed of the Delta of Ouémé is part of the southern coastal sedimentary basin of Benin. Economic development in this region is essentially based on farming, fishing, and livestock breeding, which are activities that may lead to environmental pollution, including both surface and groundwater pollution. The major aim of the study is to examine the quality of groundwater and to find out the likely sources of pollution in this watershed, using an isotope mixing model (MixSIAR). The methodology applied calls on classical hydrochemical approaches, Self-Organizing Map (SOM), and stable nitrate isotopes (¹⁵N;¹⁸O) (allowing more accurate discrimination of contamination sources compared to hydrochemical methods). Results demonstrated that the origins of nitrate in groundwater are mainly from manure and sewage and soil nitrogen nitrification. The Bayesian model estimated the contribution of each source and the results have shown that manure and sewage represent the dominant contributors to groundwater nitrate (75.2 % and 87.3 % in the Mio-Pliocene and the Quaternary aquifers, respectively). Then, groundwater pollution during both the dry and rainy periods was mainly due to anthropogenic activities. These results highlight some major implications: (i) groundwater pollution is mainly of anthropogenic origin, calling for better control of agricultural and domestic practices; (ii) the isotopic approach coupled with advanced statistical methods is an effective tool for distinguishing and quantififing pollution sources; and (iii) the study provides a scientific basis for strengthening aquifer protection policies, limiting nitrate-related health risks and promoting sustainable management of water resources.

乌萨梅斯三角洲的分水岭是贝宁南部沿海沉积盆地的一部分。该地区的经济发展主要以农业、渔业和畜牧业为基础，这些活动可能导致环境污染，包括地表水和地下水污染。该研究的主要目的是使用同位素混合模型（MixSIAR）检查地下水的质量，并找出该流域可能的污染源。该方法采用了经典的水化学方法、自组织图（SOM）和稳定的硝酸盐同位素（15N;18O）（与水化学方法相比，可以更准确地识别污染源）。结果表明，地下水中硝酸盐的来源主要是粪肥、污水和土壤氮硝化作用。贝叶斯模型估算了各来源的贡献，结果表明，粪便和污水是地下水硝酸盐的主要来源（在中新-上新世和第四纪含水层分别占75.2%和87.3%）。干雨期地下水污染主要由人为活动引起。这些结果突出了一些主要影响：(i)地下水污染主要是人为造成的，要求更好地控制农业和家庭做法；（ii）同位素方法结合先进的统计方法是区分和量化污染源的有效工具；（三）该研究为加强含水层保护政策、限制与硝酸盐有关的健康风险和促进水资源的可持续管理提供了科学依据。

{"title":"Groundwater hydrochemistry and identification of nitrate pollution sources in the Ouémé Delta (Southern-Benin) using dual isotopes (15N–NO3 and 18O–NO3) and a Bayesian isotope mixing model","authors":"Aoulatou Alassane Zakari , Kodjo Apelete Raoul Kpegli , Dadja-Toyou Masamaéya Gnazou , Abdoukarim Alassane , Bio Guidah Chabi , Fabrice Messan Amene Lawson , Nicaise Yalo , Daouda Mama , Moussa Boukari","doi":"10.1016/j.cscee.2025.101303","DOIUrl":"10.1016/j.cscee.2025.101303","url":null,"abstract":"<div><div>The watershed of the Delta of Ouémé is part of the southern coastal sedimentary basin of Benin. Economic development in this region is essentially based on farming, fishing, and livestock breeding, which are activities that may lead to environmental pollution, including both surface and groundwater pollution. The major aim of the study is to examine the quality of groundwater and to find out the likely sources of pollution in this watershed, using an isotope mixing model (MixSIAR). The methodology applied calls on classical hydrochemical approaches, Self-Organizing Map (SOM), and stable nitrate isotopes (<sup>15</sup>N;<sup>18</sup>O) (allowing more accurate discrimination of contamination sources compared to hydrochemical methods). Results demonstrated that the origins of nitrate in groundwater are mainly from manure and sewage and soil nitrogen nitrification. The Bayesian model estimated the contribution of each source and the results have shown that manure and sewage represent the dominant contributors to groundwater nitrate (75.2 % and 87.3 % in the Mio-Pliocene and the Quaternary aquifers, respectively). Then, groundwater pollution during both the dry and rainy periods was mainly due to anthropogenic activities. These results highlight some major implications: (i) groundwater pollution is mainly of anthropogenic origin, calling for better control of agricultural and domestic practices; (ii) the isotopic approach coupled with advanced statistical methods is an effective tool for distinguishing and quantififing pollution sources; and (iii) the study provides a scientific basis for strengthening aquifer protection policies, limiting nitrate-related health risks and promoting sustainable management of water resources.</div></div>","PeriodicalId":34388,"journal":{"name":"Case Studies in Chemical and Environmental Engineering","volume":"13 ","pages":"Article 101303"},"PeriodicalIF":0.0,"publicationDate":"2025-11-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145617556","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

Fluoride failure: From Sandy City's water system incident to statewide ban and beyond 氟化物的失败：从桑迪市的水系统事件到全州范围的禁令以及其他

Q1 Environmental Science

Case Studies in Chemical and Environmental Engineering

Pub Date : 2025-11-27 DOI: 10.1016/j.cscee.2025.101304

Robert B. Sowby

In 2019, a fluoride overfeed in the drinking water system of Sandy City, Utah, USA, sickened residents, corroded pipes, and released lead and copper. Sandy operators changed practices immediately, state water regulators issued administrative orders in following years, and in 2025, due partly to the incident and partly to national mood, the Utah legislature banned water fluoridation altogether—the first such ban in the United States. This case study examines the incident's technical failures (in equipment settings, control logic, and hydraulics), procedural failures (in water sampling, record keeping, and public notification), and how changes in fluoridation practice and policy escalated from a single local event to the national stage.

2019年，美国犹他州桑迪市饮用水系统中的氟化物过量，导致居民生病，管道腐蚀，并释放铅和铜。Sandy的运营者立即改变了做法，州水监管机构在接下来的几年里发布了行政命令，并在2025年，部分由于事件，部分由于国民情绪，犹他州立法机构完全禁止了水氟化——这是美国第一个这样的禁令。本案例研究考察了该事件的技术故障（设备设置、控制逻辑和液压）、程序故障（水采样、记录保存和公众通知），以及氟化实践和政策的变化如何从单一的地方事件升级到国家阶段。

引用次数: 0

Enhancement of practical use of natural coagulant, Moringa oleifera extract, by simple purification and optimization of salt concentration 通过简单提纯和盐浓度优化，提高了天然混凝剂辣木提取物的实用性

Q1 Environmental Science

Case Studies in Chemical and Environmental Engineering

Pub Date : 2025-11-08 DOI: 10.1016/j.cscee.2025.101301

Thuy Lien Nguyen , Thu Hang Duong , Tien Hiep Cao , Tetsuji Okuda , Thi Viet Nga Tran

A facile technique to minimize salt and organic materials in natural coagulants from the extract of Moringa oleifera seeds was tried. Salt (NaCl) solution 0.3 M had the best coagulation efficiency and high protein concentration crude extract for turbid water (nearly 90 % removal at 100–150 NTU Kaolin). A subsequent dilute-precipitation process formed an insoluble gel that slightly decreased the crude Moringa extract coagulation efficiency but significantly reduced the residuals and improved the treated water quality. Results from this study have significant implications for practical application in safe water supply in climate change affected regions and where Moringa seeds available.

对辣木籽提取物中天然混凝剂中的盐和有机物进行了简化处理。在100 ~ 150 NTU高岭土条件下，0.3 M盐溶液的混凝效果最好，粗提物蛋白浓度高，去除率近90%。随后的稀释沉淀工艺形成不溶性凝胶，略微降低了辣木粗提取物的混凝效率，但显著降低了残留物，改善了处理后的水质。本研究结果对气候变化影响地区辣木种子安全供水的实际应用具有重要意义。

引用次数: 0

首页上一页

下一页尾页

类型

全部化学•材料生命科学医学物理工程技术环境•农林材料科学地球科学法学管理学化学环境科学与生态学计算机科学教育学经济学农林科学人文科学生物学数学物理与天体物理心理学综合性期刊其他工业工程理学历史学农学文学信息工程

数据库

全部 ACS Publications Elsevier ieeexplore Springer The Royal Society of Chemistry Wiley

期刊

Case Studies in Chemical and Environmental Engineering

全部 Acc. Chem. Res. ACS Applied Bio Materials ACS Appl. Electron. Mater. ACS Appl. Energy Mater. ACS Appl. Mater. Interfaces ACS Appl. Nano Mater. ACS Appl. Polym. Mater. ACS BIOMATER-SCI ENG ACS Catal. ACS Cent. Sci. ACS Chem. Biol. ACS Chemical Health & Safety ACS Chem. Neurosci. ACS Comb. Sci. ACS Earth Space Chem. ACS Energy Lett. ACS Infect. Dis. ACS Macro Lett. ACS Mater. Lett. ACS Med. Chem. Lett. ACS Nano ACS Omega ACS Photonics ACS Sens. ACS Sustainable Chem. Eng. ACS Synth. Biol. Anal. Chem. BIOCHEMISTRY-US Bioconjugate Chem. BIOMACROMOLECULES Chem. Res. Toxicol. Chem. Rev. Chem. Mater. CRYST GROWTH DES ENERG FUEL Environ. Sci. Technol. Environ. Sci. Technol. Lett. Eur. J. Inorg. Chem. IND ENG CHEM RES Inorg. Chem. J. Agric. Food. Chem. J. Chem. Eng. Data J. Chem. Educ. J. Chem. Inf. Model. J. Chem. Theory Comput. J. Med. Chem. J. Nat. Prod. J PROTEOME RES J. Am. Chem. Soc. LANGMUIR MACROMOLECULES Mol. Pharmaceutics Nano Lett. Org. Lett. ORG PROCESS RES DEV ORGANOMETALLICS J. Org. Chem. J. Phys. Chem. J. Phys. Chem. A J. Phys. Chem. B J. Phys. Chem. C J. Phys. Chem. Lett. Analyst Anal. Methods Biomater. Sci. Catal. Sci. Technol. Chem. Commun. Chem. Soc. Rev. CHEM EDUC RES PRACT CRYSTENGCOMM Dalton Trans. Energy Environ. Sci. ENVIRON SCI-NANO ENVIRON SCI-PROC IMP ENVIRON SCI-WAT RES Faraday Discuss. Food Funct. Green Chem. Inorg. Chem. Front. Integr. Biol. J. Anal. At. Spectrom. J. Mater. Chem. A J. Mater. Chem. B J. Mater. Chem. C Lab Chip Mater. Chem. Front. Mater. Horiz. MEDCHEMCOMM Metallomics Mol. Biosyst. Mol. Syst. Des. Eng. Nanoscale Nanoscale Horiz. Nat. Prod. Rep. New J. Chem. Org. Biomol. Chem. Org. Chem. Front. PHOTOCH PHOTOBIO SCI PCCP Polym. Chem.

﹀