Article
Environmental Sciences
Alicia Fischer, Ming-Kuo Lee, Ann S. Ojeda, Stephanie R. Rogers
Summary: Arsenic contamination in groundwater is a global crisis known to cause various health issues, and this study aimed to determine the most accurate GIS interpolation method for mapping the effects of bioremediation on arsenic sequestration. The results showed that Ordinary Kriging consistently provided the most accurate predictions of arsenic concentrations across space and time, with a higher accuracy compared to the other interpolation methods.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2021)
Article
Environmental Sciences
Xu Ma, Jiaxi Zhang, Mario A. Gomez, Yu Ding, Shuhua Yao, Hongtao Lv, Xin Wang, Shaofeng Wang, Yongfeng Jia
Summary: The coprecipitation and aging of Fe(III)-As(III)-As(V)-SO4(2-) in acidic systems play a crucial role in controlling arsenic behavior. The study investigates the redistribution and transformation of arsenic in the system at different Fe/As molar ratios and pH values. Results show that As(III) contents in the solid products change with aging time and conditions, indicating the complex behavior of arsenic in the system.
SCIENCE OF THE TOTAL ENVIRONMENT
(2021)
Article
Engineering, Chemical
H. L. Mendes, C. L. Caldeira, V. S. T. Ciminelli
Summary: By treating arsenic-bearing, hematite-rich calcines with sulfuric acid, an efficient method for arsenic removal in effluent treatment has been developed. The process results in residues containing ferric arsenate/arsenite and hydrated calcium arsenate, potentially reducing treatment costs and environmental impact.
MINERALS ENGINEERING
(2021)
Article
Environmental Sciences
Erika E. Rios-Valenciana, Tonatiuh Moreno-Perlin, Roberto Briones-Gallardo, Reyes Sierra-Alvarez, Lourdes B. Celis
Summary: Biogeochemical processes control the transport and availability of arsenic in sediments. Transition from indigenous communities to cultivable consortia exposed to high arsenic concentrations is poorly understood. Understanding the dynamics and selective pressures in the development of bacterial consortia is crucial for arsenic bioremediation. We found that a significant portion of arsenic in sediments is bioavailable and developed bacterial consortia using arsenic sulfide biominerals. Our study highlights the importance of these biogenic minerals as reservoirs of arsenic-resistant bacteria.
ENVIRONMENTAL RESEARCH
(2023)
Article
Microbiology
Andre G. Gouveia, Bruno A. Salgueiro, Dean O. Ranmar, Wilson D. T. Antunes, Peter Kirchweger, Ofra Golani, Sharon G. Wolf, Michael Elbaum, Pedro M. Matias, Celia V. Romao
Summary: Arsenic is a toxic heavy metal that is widely present in the environment and can severely harm water resources. Bioremediation is a sustainable and cost-effective technology for removing toxic compounds. The resistance of Deinococcus indicus, an arsenic resistant bacterium, to cellular insults was extensively characterized to explore its potential use in arsenic bioremediation.
FRONTIERS IN MICROBIOLOGY
(2023)
Article
Environmental Sciences
Aiting Li, Yingying Lu, Da Zhen, Ziheng Guo, Gejiao Wang, Kaixiang Shi, Shuijiao Liao
Summary: The presence of Enterobacter sp. E1 significantly affects the accumulation of arsenic in Pteris vittata by promoting plant growth and dissolving soil arsenic. The strain E1 increases the water-soluble and exchangeable arsenic while reducing the Fe-bound arsenic in the soil. Additionally, the strain E1 has a positive effect on microbial diversity and soil enzymatic activities with low ecological risks.
Article
Environmental Sciences
Ilhwan Park, Takashino Ryota, Takeuchi Yuto, Carlito Baltazar Tabelin, Theerayut Phengsaart, Sanghee Jeon, Mayumi Ito, Naoki Hiroyoshi
Summary: This study proposed a two-step process for immobilizing low concentration arsenic in wastewater, concentrating dilute arsenic solution through sorption/desorption using schwertmannite, and ultimately forming Ca-Fe-AsO4 compounds.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2021)
Article
Engineering, Environmental
Natasha, Irshad Bibi, Khalid Hussain, Rabia Amen, Israr Masood Ul Hasan, Muhammad Shahid, Safdar Bashir, Nabeel Khan Niazi, Tariq Mehmood, Hafiz Naeem Asghar, Muhammad Farrakh Nawaz, Muhammad Mahroz Hussain, Waqar Ali
Summary: Arsenic contamination in soil-plant system is a global issue. This study found that adding sulfate and soil microbes can promote maize plant growth and reduce arsenic uptake. The treatment with soil microbes and sulfate level of 5 mmol kg(-1) showed the most promising results in reducing arsenic uptake and improving plant growth.
ENVIRONMENTAL GEOCHEMISTRY AND HEALTH
(2021)
Article
Engineering, Environmental
Jooho Park, Hyun Ju Kim, Joo Hyun Park
Summary: The study found that increasing the slag basicity can improve the efficiency of removing As from liquid copper, while in basic slag, As is mainly stabilized in the (Mg,Fe)O oxide and crystalline phases. Therefore, it is necessary to control the basicity of slag in the high-temperature process for efficient As removal.
JOURNAL OF HAZARDOUS MATERIALS
(2022)
Article
Engineering, Environmental
Leila Alidokht, Ioannis Anastopoulos, Dimitrios Ntarlagiannis, Pantelis Soupios, Bassam Tawabini, Dimitrios Kalderis, Alireza Khataee
Summary: This review focuses on the recent advances in the use of nanotechnologies and nanocomposites for remediation of arsenic-contaminated water and soil. Various engineered organic/inorganic nanocomposites with exceptional physical-chemical properties have been developed, showing great potential for As removal or immobilization in contaminated sites. Emerging approaches include the development of bio-nanocomposites with both oxidative and adsorptive capacities, while gaps in research and directions for future studies have been identified.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2021)
Article
Environmental Sciences
D. C. Paz-Gomez, S. M. Perez-Moreno, M. J. Gazquez, J. L. Guerrero, I Ruiz-Oria, G. Rios, J. P. Bolivar
Summary: Commercial copper is obtained through a hydro-pyrometallurgical process, where Cu anodes are enriched to Cu cathodes by electrorefining. However, impurities like arsenic accumulate in the electrolyte during this process, leading to decreased quality. A procedure was developed to fully dissolve electrolyte sludge (ES), removing arsenic and recovering copper content efficiently. The process involves optimizing dissolution, precipitation, and recovery steps to address the issue of arsenic accumulation in the industrial process.
Article
Engineering, Environmental
Muhammad Mahroz Hussain, Jianxu Wang, Irshad Bibi, Muhammad Shahid, Nabeel Khan Niazi, Jibran Iqbal, Ishaq Ahmad Mian, Sabry M. Shaheen, Safdar Bashir, Noor Samad Shah, Kiran Hina, Joerg Rinklebe
Summary: Arsenic contamination of aquatic systems is a global threat that can harm both humans and other living organisms, and algae play an important role in the biotransformation of arsenic. This review provides an in-depth exploration of various sources of arsenic, its distribution in water bodies, and the factors influencing its behavior in aquatic ecosystems, as well as the potential role of algae in arsenic remediation.
JOURNAL OF HAZARDOUS MATERIALS
(2021)
Article
Ecology
Yanhong Wang, Dazhun Wei, Ping Li, Zhou Jiang, Han Liu, Chun Qing, Helin Wang
Summary: This study isolated three anaerobic arsenate-reducing bacteria and constructed clone libraries of arsenate-metabolizing genes from groundwater samples. Genetic analysis indicated that these bacteria may have different strategies to resist arsenic toxicity. Phylogenetic analysis showed that arsenate-reducing bacterial communities in groundwater were diverse and composed of various bacterial groups.
Article
Geochemistry & Geophysics
Xu Ma, Shaofeng Wang, Mario A. Gomez, Zidan Yuan, Xing Wu, Shuhua Yao, Yongfeng Jia
Summary: This study systematically investigates the influence of sulfate on the precipitation and stability of ferric arsenate phase, as well as its underlying mechanisms. The results show that sulfate delays the removal of As and Fe while enhancing the solubility of solid ferric arsenate. Additionally, sulfate promotes the growth rate and settling of ferric arsenate, leading to an enlarged aggregate size. Sulfate is incorporated into the structure of ferric arsenate by forming a solid solution, and its presence plays a significant role in the mobilization and fate of As in acidic systems.
Article
Environmental Sciences
Mysoon M. Al-Ansari
Summary: This study demonstrates that Rhodobacter sp. possesses significant tolerance and removal potential for arsenic, making it a valuable candidate for future arsenic remediation practices.
Article
Environmental Sciences
Xiaoming Chen, Xian-Chun Zeng, Yahaya Kudush Kawa, Weiwei Wu, Xianbin Zhu, Zahid Ullah, Yanxin Wang
ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY
(2020)
Article
Ecology
Janet Victoria Ngegla, Xing Zhou, Xiaoming Chen, Xianbin Zhu, Ziwei Liu, Jilong Feng, Xian-Chun Zeng
Article
Ecology
Yifan Xu, Hao Li, Xian-Chun Zeng
Summary: A new biofilm bioreactor was developed with acidophilic As(III) oxidation bacteria, which can efficiently remove As(III) from AMD solutions under acidic conditions. The bioreactor shows stability and sustainability in continuous operation and possesses a unique diversity of As(III) oxidase genes, indicating great potential for industrial applications.
Article
Environmental Sciences
Xian-Chun Zeng, Yifan Xu, Zhong He, Yanxin Wang, Xiaoming Chen
Summary: Introducing a powerful chemoautotrophic As(III)-oxidizing bacterium into a new biofilm bioreactor enhances the efficiency and stability of treating As(III)-contaminated groundwater, with good scalability under different geochemical conditions. The bioreactor is easy to construct and operate, and shows some removal efficiency towards common contaminants in groundwater.
Article
Environmental Sciences
Yifan Xu, Wanxia Shi, Weiwei Wu, Yanxia Zuo, Xiaoming Chen, Xian-Chun Zeng
Summary: This study found that Mn(II) can greatly enhance the reductive mobilization of arsenic in soils, providing new insights into the biogeochemical cycling of arsenic and manganese.
JOURNAL OF SOILS AND SEDIMENTS
(2022)
Article
Environmental Sciences
Zahid Ullah, Yifan Xu, Xian-Chun Zeng, Abdur Rashid, Asmat Ali, Javed Iqbal, Mikhlid H. Almutairi, Lotfi Aleya, Mohamed M. Abdel-Daim, Muddaser Shah
Summary: Fluoride contamination in drinking groundwater is a significant health risk in Pakistan. This study evaluated the health risk and suitability of elevated fluoride in groundwater for drinking purposes. The results showed that fluoride levels exceeded the WHO recommended limit, posing the greatest health risk to children. Additionally, the groundwater sources were found to be contaminated due to geological and anthropogenic actions.
INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH
(2022)
Article
Environmental Sciences
Wanxia Shi, Yifan Xu, Weiwei Wu, Xian-Chun Zeng
Summary: This study found that phosphate can significantly increase microbial-mediated arsenic mobilization by increasing the abundance of As(V)-respiratory reductase genes. Since arsenic and phosphate commonly coexist in the environment, these findings are important for understanding the dynamic fluctuation of arsenic concentrations in contaminated groundwater and the interactions between the biogeochemical processes of phosphate and arsenic.
ENVIRONMENTAL POLLUTION
(2022)
Article
Engineering, Environmental
Xian-Chun Zeng, Yifan Xu, Ziwei Liu, Xiaoming Chen, Yan Wu
Summary: Dissimilatory arsenate-respiring prokaryotes (DARPs) play important roles in the formation of arsenic-contaminated groundwater. Four new DARPs were isolated using the microbial enrichment technique, and their physiological and functional features were investigated. These findings provide valuable insights into the mechanisms and dynamics of arsenic concentrations in groundwater.
Article
Environmental Sciences
Zahid Ullah, Abdur Rashid, Junaid Ghani, Javed Nawab, Xian-Chun Zeng, Muddaser Shah, Abdulwahed Fahad Alrefaei, Mohamed Kamel, Lotfi Aleya, Mohamed M. Abdel-Daim, Javed Iqbal
Summary: This study investigated the contamination of potentially harmful metals (PHMs) in groundwater in Sheikhupura District, Pakistan. The results showed that the levels of several PHMs in the groundwater samples exceeded the recommended limits by the World Health Organization. Principal component analysis indicated that the contamination sources were mainly from geogenic and anthropogenic activities. Saturation indices revealed the role of specific minerals in groundwater contamination.
FRONTIERS IN ENVIRONMENTAL SCIENCE
(2022)
Article
Environmental Sciences
Yan Wu, Weiwei Wu, Yifan Xu, Yanxia Zuo, Xian-Chun Zeng
Summary: This study investigated the role of dissimilatory arsenate-respiring prokaryotes (DARPs) in the reductive mobilization of arsenic and the influence of environmental Mn(II) on this process. Soil samples were collected from a realgar tailings-affected area and diverse arsenate-respiratory reductase (arr) genes were found. The microbial communities showed high arsenate-respiring activity and were able to stimulate the reductive mobilization of As. Addition of Mn(II) significantly increased the microbial mobilization of As and the abundances of arr genes. A new cultivable DARP, Bacillus sp. F11, was isolated from the arsenic-contaminated soils and was found to efficiently catalyze the reductive mobilization and release of As. Addition of Mn(II) further enhanced the F11 cells-mediated reductive mobilization of As and increased the abundances of arr genes. These findings provide new insights into the biogeochemical cycles of arsenic and manganese.
JOURNAL OF ENVIRONMENTAL SCIENCES
(2023)
Article
Engineering, Environmental
Xian-Chun Zeng, Yifan Xu, Hongyu Lu, Jianyu Xiong, Hai Xu, Weiwei Wu
Summary: This study revealed that nitrate could inhibit or promote the reductive mobilization of arsenic by DARPs in sediments. Metagenomic analysis and isolate experiments indicated that different types of DARPs exhibited different responses to nitrate, resulting in varying effects on arsenic release.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2023)
Article
Environmental Sciences
Jianyu Xiong, Yifan Xu, Yang Li, Xian-Chun Zeng
Summary: This study discovered a novel bacterium Cellulomonas sp. CM1 with the ability to reduce both Mn and Fe oxides, and demonstrated its significant role in the generation of high-arsenic groundwater.