Article
Engineering, Environmental
Locksley F. Castaneda, Oscar Coreno, Jose L. Nava
Summary: This paper investigates the simultaneous removal of arsenic, fluoride, and hydrated silica from natural well water using electrocoagulation. The best results were achieved at a current density of 5 mA cm-2 and a linear flow velocity of 1.2 cm s-1. This method effectively reduced the concentrations of arsenic and fluoride below the World Health Organization's guideline and maintained a hydrated silica concentration of 33 mg L-1.
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
(2022)
Article
Chemistry, Physical
Jianbo Lu, Ruiyan Fan, Hanyang Wu, Wei Zhang, Jie Li, Xintong Zhang, Hongwei Sun, Dongfang Liu
Summary: The electrocoagulation technology with Fe and/or Al anode was investigated for the simultaneous removal of Cr(VI) and Cu(II) from acid wastewater. The Al-Al-Al-Al combination showed the highest removal efficiency among different electrode combinations. The operating cost analysis revealed that the sludge treatment cost accounted for the largest percentage of the operating cost, while energy consumption cost was the lowest.
JOURNAL OF MOLECULAR LIQUIDS
(2022)
Article
Multidisciplinary Sciences
Donghyeon Kim, Sungyo Jung, Chungsik Yoon
Summary: This study evaluated exposure to harmful substances, such as particulate and heavy metals, during anodizing and electroplating surface treatment processes, finding that ventilation volume, machine operation time, and workload were significant factors affecting exposure.
SCIENTIFIC REPORTS
(2021)
Article
Engineering, Environmental
Amit Kumar, D. Basu
Summary: This study evaluates the performance of rotating aluminum electrodes in removing hexavalent chromium (Cr6+) from synthetic tannery wastewater using an electrocoagulation reactor. Taguchi and Artificial Neural Network (ANN) models were developed to optimize the conditions for maximum Cr6+ removal. The BR-ANN model provided better results compared to the Taguchi model, achieving higher Cr6+ removal efficiency, reduced energy demand, and improved accuracy. The SEM and XRF analysis confirmed the adsorption and precipitation of Cr6+ with metal hydroxide sludge.
JOURNAL OF ENVIRONMENTAL HEALTH SCIENCE AND ENGINEERING
(2023)
Article
Chemistry, Multidisciplinary
Callie M. Stern, Devin D. Meche, Noemie Elgrishi
Summary: This study investigates the impact of the buffer system on the electrochemical reduction of hexavalent chromium in water. At low concentrations, the buffer affects the electron transfer step of chromium reduction, while at higher concentrations, it influences both the chemical steps and the nature of the products formed.
Article
Engineering, Environmental
Yu Hu, Li Zhou, Jia Zhu, Jingsi Gao
Summary: This study investigated the removal of polyamide microplastics from wastewater using electrocoagulation. The combination of iron anode and aluminum cathode (Fe-Al) exhibited the highest removal efficiency. The removal efficiency of microplastics increased with higher applied voltage and electrolyte concentration. The optimized conditions for polyamide removal were using Fe-Al electrodes, with a plate spacing of 2.5 cm, an applied voltage of 10 V, an initial pH of 7, and an electrolyte concentration of 0.02 mol/L. This study highlights the potential of electrocoagulation for microplastics removal and provides insights for operational parameter optimization.
JOURNAL OF WATER PROCESS ENGINEERING
(2023)
Article
Environmental Sciences
Kaidi Jiang, Jia Zhang, Zhihui Deng, Samuel Barnie, Jingjie Chang, Yawen Zou, Xiangyu Guan, Fei Liu, Honghan Chen
Summary: This study investigated the zoning characteristics of abiotic and biotic effects in a Cr(VI) contaminated natural wetland. The contaminated zone was dominated by chemical reduction by natural organic matters, while the downstream area saw direct microbial reduction of Cr(VI). The transition zone experienced intermittent Cr(VI) presence with indirect reduction by Fe2+.
ENVIRONMENTAL POLLUTION
(2021)
Article
Green & Sustainable Science & Technology
Min Zhuang, Hui Wang, Lu Qi, Liqiang Cui, Guixiang Quan, Jinlong Yan
Summary: In this study, activated biochar was successfully prepared as a support for sulfidated nanoscale zero-valent iron (S-nZVI@ABC), significantly increasing the specific surface area and achieving even particle dispersion for improved removal efficiency of Cr(VI). Higher S/Fe ratio, dosage, lower pH, and Cr(VI) concentration all contributed to enhanced removal efficiency. The removal process was endothermic and involved multiple interaction mechanisms in the removal of Cr(VI) by S-nZVI@ABC.
JOURNAL OF CLEANER PRODUCTION
(2021)
Article
Chemistry, Multidisciplinary
Jien Ye, Yating Luo, Jiacong Sun, Jiyan Shi
Summary: The study found that bentonite-modified nZVI showed improved efficiency in removing Cr(VI) and enhanced transport performance compared to nZVI. The transport of both materials was negatively correlated with the clay composition in different soils. Besides, modification of nZVI by bentonite reduced toxicity to luminous bacteria and ryegrass, indicating potential for in situ environmental remediation.
Article
Chemistry, Multidisciplinary
Serge Raoul Tchamango, Kevine Wandji Ngayo, Placide Desire Belibi Belibi, Francine Nkouam, Martin Benoit Ngassoum
Summary: By applying classical electrocoagulation and indirect electrocoagulation to an artificial dairy effluent, the study found that optimum removals were achieved at pH 7 with calcium chloride as the supporting electrolyte. The treated effluent can be reused within 45 hours, and the results showed similar turbidity and phosphates removal between electrocoagulation with open circuit and classical electrocoagulation, with the latter showing weaker removal of organic matter.
SEPARATION SCIENCE AND TECHNOLOGY
(2021)
Article
Environmental Sciences
Marius Gheju, Ionel Balcu
Summary: The aim of this study was to investigate the effect of non-expansive inert material addition on anionic pollutant removal efficiency in Fe-0-H2O system. Both batch experiments and column tests were conducted using Cr-VI as a contaminant. The results showed that Fe-0 + sand systems exhibited higher Cr-VI removal efficiency compared to Fe-0 only or sand only systems, especially at lower Fe-0 ratios. However, the positive effect of sand co-presence decreased with increasing pH. The study suggests that a volumetric ratio of Fe-0:sand = 1:3 could enhance the removal efficiency of Cr-VI from contaminated water.
Article
Engineering, Environmental
Yan Yang, Yuhao Zhang, Guiyin Wang, Zhanbiao Yang, Junren Xian, Yuanxiang Yang, Ting Li, Yulin Pu, Yongxia Jia, Yun Li, Zhang Cheng, Shirong Zhang, Xiaoxun Xu
Summary: The study synthesized FeS/chitosan/biochar composite (FSBC) to effectively remove Cr(VI) from water, demonstrating enhanced adsorption capacity compared to individual FeS particles and biochar. Increasing temperature promoted removal of Cr(VI), while increasing Cl- and SO42- concentrations and solution pH hindered adsorption. The results suggest that FSBC can be high-effective adsorbents for Cr(VI) removal in water environments, with the removal mechanism involving surface adsorption, reduction, and precipitation.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2021)
Article
Metallurgy & Metallurgical Engineering
Qiang Zhao, Baibing Yang, Haowen Ren, Shihong Chen, Chunhui Luo, Quande Li, Wei Yang, Kangping Yan
Summary: The discharge of wastewater containing Cr(VI) and the accumulation of Fe-P slag pose a threat to the environment and human health. This paper proposes an approach that uses Fe-P slag as a reducing agent to completely remove Cr(VI) from the wastewater. Experimental study shows that the temperature and dosage of Fe-P slag significantly affect the reaction kinetics and removal efficiency. A simplified industrial procedure is also proposed for Cr(VI) removal without additional power input.
Article
Chemistry, Physical
Ge Gao, Lei Zhang, Yixin Shi, Shengjiong Yang, Gen Wang, Huining Xu, Dahu Ding, Rongzhi Chen, Pengkang Jin, Xiaochang C. Wang
Summary: The study found that the microscopic galvanic cell (mGC) exhibited higher Fe(II) release performance compared to ordinary nanoscale-ZVI (nZVI), resulting in improved Cr(VI) removal efficiency. Density functional theory (DFT) revealed that the close proximity of cathode and anode in mGC enhanced the galvanic corrosion of Fe(0). Additionally, hydroxyl radicals generated by a series of side-reactions slightly hindered the reduction of Cr(VI) in the system.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2022)
Article
Engineering, Environmental
Wenying Zhang, Linbo Qian, Lu Han, Lei Yang, Da Ouyang, Ying Long, Zifei Wei, Xinzhu Dong, Cong Liang, Jing Li, Mingyue Gu, Mengfang Chen
Summary: The study successfully demonstrated simultaneous removal of Cr(VI) and TCE from aqueous solutions using AT-nZVI/PS systems, with removal efficiencies reaching over 90% for both contaminants.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Engineering, Environmental
Shun-Shun Chen, Xu-Xiu Chen, Tian-Yu Yang, Li Chen, Zheng Guo, Xing-Jiu Huang
Summary: A temperature-modulated sensing strategy was proposed to identify and determine BTEX compounds. Highly effective identification of BTEX was achieved using linear discrimination and convolutional neural network analyses. Additionally, quantitative analysis of concentration was accomplished by establishing the relationship between concentration and response.
JOURNAL OF HAZARDOUS MATERIALS
(2024)
Article
Engineering, Environmental
Myungkyung Noh, Jeong Yeon Sim, Jisung Kim, Jee Hwan Ahn, Hye-Young Min, Jong-Uk Lee, Jong-Sook Park, Ji Yun Jeong, Jae Young Lee, Shin Yup Lee, Hyo-Jong Lee, Choon-Sik Park, Ho-Young Lee
Summary: This study reveals that chronic exposure to PM induces chronic inflammation and development of COPD by dysregulating NAD+ metabolism and subsequent SIRT1 deficiency in pulmonary macrophages. Activation of SIRT1 by resveratrol effectively mitigates PM-induced inflammation and COPD development. Targeting metabolic and epigenetic reprogramming in macrophages induced by PM is a promising strategy for COPD treatment.
JOURNAL OF HAZARDOUS MATERIALS
(2024)
Article
Engineering, Environmental
Yu Liu, Linlin Qin, Yiming Qin, Tong Yang, Haoran Lu, Yulong Liu, Qiqi Zhang, Wenyan Liang
Summary: Co/NC/PAC electrode was prepared by compounding ZIF-67 with powder-activated carbon for the electrocatalytic treatment of nitrogen-containing heterocyclic compounds. The degradation efficiency of the four compounds reached 90.2-93.7% under optimal conditions, and the degradation order was pyridazine < pyrimidine < pyrazine < pyridine.
JOURNAL OF HAZARDOUS MATERIALS
(2024)
Article
Engineering, Environmental
Julien Couturier, Pierre Tamba Oulare, Blanche Collin, Claire Lallemand, Isabelle Kieffer, Julien Longerey, Perrine Chaurand, Jerome Rose, Daniel Borschneck, Bernard Angeletti, Steven Criquet, Renaud Podor, Hamed Pourkhorsandi, Guilhem Arrachart, Clement Levard
Summary: This study analyzes the properties of bauxite residue samples and explores the influence of bauxite ore origin, storage conditions, and storage time. The results show that the speciation of yttrium is related to the origin of bauxite ore, while no significant variation was observed with storage conditions or aging of the residues.
JOURNAL OF HAZARDOUS MATERIALS
(2024)
Article
Engineering, Environmental
Sakthinarenderan Saikumar, Ravi Mani, Mirunalini Ganesan, Inbakandan Dhinakarasamy, Thavamani Palanisami, Dharani Gopal
Summary: Microplastic contamination in marine ecosystems poses a growing concern due to its trophic transfer and negative effects on marine organisms. This study investigates the transfer and impacts of polystyrene microplastics in an estuarine food chain. The results show that microplastics can be transferred through the food chain, although the transfer rates are low. The exposed organisms exhibit stress responses, suggesting the potential risk of microplastics reaching humans through the food chain.
JOURNAL OF HAZARDOUS MATERIALS
(2024)
Review
Engineering, Environmental
Yan-Jiao Li, Ying Yuan, Wen-Bing Tan, Bei-Dou Xi, Hui Wang, Kun-Long Hui, Jia-Bao Chen, Yi-Fan Zhang, Lian-Feng Wang, Ren-Fei Li
Summary: This review investigated and analyzed the distribution, composition, and abundance of heavy metals and antibiotic resistance genes (ARGs) in landfill. The results showed that heavy metals have lasting effects on ARGs, and complexes of heavy metals and organic matter are common in landfill. This study provides a new basis to better understand the horizontal gene transfer (HGT) of ARGs in landfill.
JOURNAL OF HAZARDOUS MATERIALS
(2024)
Article
Engineering, Environmental
Jessy Joseph, Ari Vaisanen, Ajay B. Patil, Manu Lahtinen
Summary: Efficient and environmentally friendly porous hybrid adsorbent beads have been developed for the removal of arsenic from drinking water. The structural tuning of the adsorbents has been shown to have a significant impact on their adsorption performance, with high crystallinity leading to increased adsorption capacity and selectivity towards As5+.
JOURNAL OF HAZARDOUS MATERIALS
(2024)
Article
Engineering, Environmental
Yangyang Liu, Minhua Xiao, Kaiqin Huang, Juntao Cui, Hongli Liu, Yingxin Yu, Shengtao Ma, Xihong Liu, Meiqing Lin
Summary: This study measured the levels of phthalate metabolites in breast milk collected from mothers in southern China. The results showed that phthalates are still prevalent in the region, and breastfeeding contributes to phthalate intake in infants. However, the levels detected do not pose significant health risks to infants based on dietary exposure. The increasing exposure to certain phthalates calls for further research into their sources and potential risks.
JOURNAL OF HAZARDOUS MATERIALS
(2024)
Article
Engineering, Environmental
Zhiqiang Wu, Jianxing Sun, Liting Xu, Hongbo Zhou, Haina Cheng, Zhu Chen, Yuguang Wang, Jichao Yang
Summary: Ocean depth affects microbial diversity, composition, and co-occurrence patterns of microplastic microbial communities. Deterministic processes dominate the assembly of mesopelagic plastisphere microbial communities, while stochastic processes shape the assembly of bathypelagic microbial communities. The relationships between microorganisms in the mesopelagic layer are more complex and stable, with Proteobacteria and Actinobacteriota playing important roles.
JOURNAL OF HAZARDOUS MATERIALS
(2024)
Article
Engineering, Environmental
Tingting Xiao, Renjie Chen, Chen Cai, Shijie Yuan, Xiaohu Dai, Bin Dong, Zuxin Xu
Summary: Based on the efficiency of catalytic ozonation techniques in enhancing sludge dewaterability, this study investigated its effectiveness in simultaneous reduction of antibiotics and antibiotic resistance genes. The results showed that catalytic ozonation conditioning changed the distribution of antibiotics and achieved high degradation rates. It also significantly reduced the abundance of ARGs, inhibited horizontal gene transfer, and decreased the signal transduction of typical ARGs host bacteria.
JOURNAL OF HAZARDOUS MATERIALS
(2024)
Article
Engineering, Environmental
Yang Deng, Xiaohong Guan
Summary: This article discusses two different development approaches for ferrate(VI) technology in water treatment, arguing that process integration is a promising method that can drive technological innovation and revolution in water treatment, achieving higher treatment efficiency, reduced costs and energy consumption, and a smaller physical footprint.
JOURNAL OF HAZARDOUS MATERIALS
(2024)
Article
Engineering, Environmental
Zhe Zhang, Lu Zhang, Zhihao Huang, Yuxin Xu, Qingqing Zhao, Hongju Wang, Meiqing Shi, Xiangnan Li, Kai Jiang, Dapeng Wu
Summary: In this study, a floating catalytic foam was designed and prepared to enhance the mass transfer in immobilized photocatalysts for wastewater treatment. The floating catalytic foam could float on the water surface and establish a temperature gradient, effectively promoting the diffusion and adsorption of target molecules during the photocatalytic process.
JOURNAL OF HAZARDOUS MATERIALS
(2024)
Article
Engineering, Environmental
Muhammad Nafees, Adiba Khan Sehrish, Sarah Owdah Alomrani, Linlin Qiu, Aasim Saeed, Shoaib Ahmad, Shafaqat Ali, Hongyan Guo
Summary: The accumulation of cadmium and antibiotics in edible plants and fertile soil is a worldwide problem. This study investigated the potential of zinc oxide nanoparticles to alleviate the toxicity of both cadmium and antibiotics and promote spinach growth.
JOURNAL OF HAZARDOUS MATERIALS
(2024)
Article
Engineering, Environmental
Lurui Wan, Kai Wang, Yuan Chen, Zhiyong Xu, Wenbo Zhao
Summary: In this study, a low viscosity and high thermal stability SO2 absorbent with dual interacting sites was successfully synthesized. The absorbent showed the highest absorption enthalpy change and entropy change values among reported SO2 absorbents, and exhibited lower viscosity and comparable thermal stability to ILs.
JOURNAL OF HAZARDOUS MATERIALS
(2024)
Article
Engineering, Environmental
Zhengwei Zhou, Guojie Ye, Yang Zong, Zhenyu Zhao, Deli Wu
Summary: This study utilized Mo powder and STPP to enhance the performance of the sodium percarbonate system in pollutant degradation. The presence of Mo and STPP resulted in a higher degradation rate of the model pollutant SMX, with low oxidant consumption. The system generated multiple active species through a series of chain reactions at different pH values, exhibiting excellent performance towards electron-rich pollutants. Furthermore, Mo demonstrated excellent stability and reusability.
JOURNAL OF HAZARDOUS MATERIALS
(2024)