Article
Environmental Sciences
Wan Azlina Ahmad, Chidambaran Kulandaisamy Venil, Evans M. Nkhalambayausi Chirwa, Yi-Tin Wang, Mohd Helmi Sani, Abdul Fatah A. Samad, Mohd Farizal Ahmad Kamaroddin, Edgardo R. Donati, Maria Sofia Urbieta, Zainul Akmar Zakaria
Summary: The review discusses the significance of hexavalent and trivalent chromium compounds, the challenges of current Cr(VI) treatment techniques, and the feasibility of biological processes for Cr(VI) reduction in industrial effluents. It also highlights the cytotoxicity and genotoxicity of Cr(VI), recent findings in bacterial reduction of Cr(VI), operational challenges, and examples of laboratory-scale and pilot-scale evaluations.
CURRENT POLLUTION REPORTS
(2021)
Review
Environmental Sciences
Jia Chen, Yongqiang Tian
Summary: This review discusses the widespread industrial applications of chromium and its compounds, as well as their serious impact on the environment and biological systems. It highlights the advantages of biological treatment methods for Cr(VI) over traditional methods in terms of environmental friendliness and cost-efficiency. The review also describes how bacteria tolerate and reduce Cr(VI), the effects of physical and chemical factors on the reduction of Cr(IV), and practical applications of bacterial cells for Cr(VI) reduction.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2021)
Article
Environmental Sciences
Xiao Tan, Yinjie Zhang, Meng Liu, Jinman Cao, Guilan Duan, Jun Cui, Aijun Lin
Summary: In this study, a novel layered double hydroxide was prepared through ultrasonic-assisted co-precipitation method, which can efficiently remove Cr(VI) contamination in water and has good removal effects at different pH ranges. The results of the study indicate that U-Fe/Al-LDH is a promising remediation agent and a feasible method for Cr(VI) removal.
Article
Environmental Sciences
Xinru Yang, Xueming Qin, Jiayin Xie, Xiaoyu Li, Huichao Xu, Yongsheng Zhao
Summary: Molasses have a significant effect on the bioremediation of Cr(VI) contaminated groundwater, stimulating its reduction and reducing toxicity on bacteria. Molasses has a higher removal efficiency compared to glucose or emulsified vegetable oil, with a higher remediation concentration and faster removal rate.
Article
Engineering, Environmental
Yan Sun, Yaguang Du, Jirong Lan, Wei Zhan, Tian C. Zhang
Summary: A new method utilizing ball milling and sodium sulfide has been developed for efficient treatment of hexavalent chromium in soda ash Chromite Ore Processing Residue. This method significantly reduced the Cr(VI) concentration and achieved a high reduction efficiency. The results showed improved liberation of chromite grains and reduction of Cr(VI) in chromite and magnesioferrite, providing guidance for future industrial applications.
JOURNAL OF HAZARDOUS MATERIALS
(2021)
Article
Engineering, Environmental
Siyu Zhang, Changhao Li, Changdong Ke, Sijia Liu, Qian Yao, Weilin Huang, Zhi Dang, Chuling Guo
Summary: Photosensitized biohybrid system (PBS) allows bacteria to utilize light energy harvested by semiconductors for efficient pollutants transformation, showing great potential in water reclamation. Establishing a biocompatible environment during photocatalytic reactions is crucial for the development of PBS-based treatment technologies. Supplying extracellular polymeric substances (EPS) fractions is found to enhance bacterial viability under adverse conditions, improving the performance of PBS for environmental remediation.
Article
Environmental Sciences
Yuan Liu, Yanlun Qiu, Qi Yin, Xinglong Li, Qunhua Bai, Yingli Li, Hong Xiao
Summary: The study investigated the mechanisms of Cr(VI) tolerance and reduction in the wild strain CM01 and its response to environmental pollution pressure at the molecular level. The iTRAQ technique identified differentially expressed proteins in domesticated CM01 related to Cr(VI) resistance. These findings were confirmed by RT-qPCR, showing consistency in gene expression levels. Additionally, domesticated CM01 displayed increased hydrophobicity, self-aggregation, glucose content, and SOD activity in response to Cr(VI) treatment.
ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY
(2021)
Article
Engineering, Environmental
Senem Teksoy Basaran, Fatma Seda Kutlar, Erkan Sahinkaya
Summary: The sulfidogenic activated carbon-bed bioreactor (SACB) demonstrated excellent performance in degrading hexavalent chromium (Cr6+), as well as in sulfate reduction and carbon oxidation. Results showed promising performance in both the presence and absence of Cr6+, with good alkalinity generation and Cr6+ removal efficiency.
JOURNAL OF WATER PROCESS ENGINEERING
(2021)
Article
Agricultural Engineering
Mahboubeh Kafil, Frank Berninger, Eleni Koutra, Michael Kornaros
Summary: This study evaluated the bioremediation potential of Scenedesmus quadricauda microalgae for removing hexavalent chromium from synthetic wastewater. The findings showed that higher inoculum and Cr (VI) concentrations resulted in higher removal efficiency, and heavy metal effects were alleviated under heterotrophic conditions. Furthermore, Cr (VI) stress affected biomass quality and the production of lipids and carbohydrates.
BIORESOURCE TECHNOLOGY
(2022)
Article
Environmental Sciences
Wenzhi Gu, Mengyao Cui, Chang Tian, Cuicui Wei, Lixia Zhang, Dechong Zheng, Daping Li
Summary: The study found that citrate and lactate have good reduction effects in the continuous and stable remediation of Cr (VI)-contaminated soil, and citrate is more advantageous in maintaining the stability of the soil microbial community.
ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY
(2021)
Review
Environmental Sciences
Nazeer Abdul Azeez, Swati Sucharita Dash, Sathyanarayana Naidu Gummadi, Vijaykumar Sudarshana Deepa
Summary: This article discusses the pollution of the environment with toxic heavy metals due to industrialization and modern agricultural practices, with a focus on hexavalent chromium. Various methods, including nano and bioremediation, have been employed to reduce heavy metal concentrations, improving efficiency and lowering costs.
Article
Biochemistry & Molecular Biology
Chunzi Xu, Yunlan Xu, Dengjie Zhong, Haixing Chang, Jiaxin Mou, Hui Wang, Hongyu Shen
Summary: To improve the removal efficiency of Cr (VI) by chitosan, this study successfully synthesized a Zr4+ and glutaraldehyde crosslinked polyethyleneimine functionalized chitosan (CGPZ) composite. The adsorption process of Cr (VI) by CGPZ was found to be a spontaneous endothermic process controlled by entropy. The adsorbent showed good acid-base resistance and regeneration performance. CGPZ can synergistically adsorb Cr (VI) through electrostatic interaction and ion exchange, and then reduce Cr (VI) to Cr (III) and chelate Cr (III) through specific functional groups.
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
(2023)
Article
Engineering, Environmental
Shakeel Ahmad, Feilong Gao, Honghong Lyu, Jingkang Ma, Beibei Zhao, Siyu Xu, Cholnam Ri, Jingchun Tang
Summary: This study investigates the removal of hexavalent chromium and nitrobenzene using iron and nitrogen doped biochar composites. The results show that the Fe1-N1-BC1 composite exhibits higher efficiency and stability in pollutant removal, and is capable of simultaneously removing different types of pollutants.
CHEMICAL ENGINEERING JOURNAL
(2022)
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
Environmental Sciences
Xinru Yang, Peng Liu, Meng Yao, He Sun, Ruxue Liu, Jiayin Xie, Yongsheng Zhao
Summary: The study found that using molasses to remediate Cr(VI)-contaminated groundwater is cost-effective and can effectively avoid secondary contamination. The addition of ascorbic acid can promote the rate of bioremediation, while NaHCO3 can buffer pH changes and promote the precipitation of Cr(III).
SCIENCE OF THE TOTAL ENVIRONMENT
(2021)