Results 61 to 70 of about 5,064,609 (152)

Investigation of Cr(VI) reduction in continuous-flow activated sludge systems

, 2004
The aim of this research was to investigate hexavalent chromium, Cr(VI), reduction by activated sludge and to evaluate the use of continuous-flow activated sludge systems for the treatment of Cr(VI)-containing wastewater. Three series of experiments were
Thomaidis, N.S., Stasinakis, A.S., Lekkas, T.D., Mamais, D.   +3 more
core   +2 more sources

Cation-driven electrostatic modulation enhances Cr(VI) reduction by biochar

Environmental Chemistry and Ecotoxicology
The coexistence of cations and anions critically influences contaminant behavior in various environments, yet their roles in redox-driven remediation remain underexplored.
Wang Fu, Yundie Liang, Quan Chen, Min Wu, Danping Wu, Patryk Oleszczuk, Bo Pan   +6 more
doaj   +1 more source

Toxicity of Cr(III) to Shewanella sp. Strain MR-4 during Cr(VI) Reduction

, 2016
Bioremediation of chromium through the reduction of hexavalent chromium (as the chromate ion, CrO42-) is based on the notion that the product, trivalent chromium (Cr(III)), is less toxic than chromate. In this study, we show that soluble Cr(III), present
Anna Obraztsova (2298823), Mason R. Mackey (2511856), Bradley M. Tebo (130860), Rizlan Bencheikh-Latmani (2511853), Mark H. Ellisman (1225158)   +4 more
core   +1 more source

An X-ray absorption spectroscopic study of the Fe(II)-induced transformation of Cr(VI)-substituted schwertmannite

, 2022
The environmental chemistry of Cr is of widespread interest due to the hazardous nature of Cr(VI). Because of similar atomic size and charge, CrVIO42- can substitute for SO42- within schwertmannite - an Fe(III) oxyhydroxysulfate mineral that occurs ...
Karimian, Niloofar, Choppala, Girish, Burton, Edward D   +2 more
core   +1 more source

Influencing Factors of Hexavalent Chromium Speciation Transformation in Soil from a Northern China Chromium Slag Site

Molecules
Chromium slag sites pose severe environmental risks due to hexavalent chromium (Cr(VI)) contamination, characterized by high mobility and toxicity. This study focused on chromium-contaminated soil from a historical chromium slag site in North China ...
Shuai Zhu, Junru Chen, Yun Zhu, Baoke Zhang, Jing Jia, Meng Pan, Zhipeng Yang, Jianhua Cao, Yating Shen   +8 more
doaj   +1 more source

Cr Stable Isotopes in Snake River Plain Aquifer Groundwater: Evidence for Natural Reduction of Dissolved Cr(VI)

, 2016
At Idaho National Laboratory, Cr(VI) concentrations in a groundwater plume once exceeded regulatory limits in some monitoring wells but have generally decreased over time.
Thomas M. Johnson (1990762), Amanda L. Raddatz (2237515), Travis L. McLing (2237512)   +2 more
core   +2 more sources

Removal of chromium(VI) from aqueous solutions by electrochemical reduction–precipitation

International Journal of Electrochemical Science, 2017
In this work, we investigated the reduction and removal of aqueous Cr(VI) via electrotreatment in a stirred batch reactor using a low-carbon steel electrode.
Yisheng Hu, Jia Zhu, Yu Liu
doaj   +1 more source

Data_Sheet_1_Pyrite-Based Cr(VI) Reduction Driven by Chemoautotrophic Acidophilic Bacteria.docx

, 2020
Cr(VI) is considered as a priority pollutant, and its remediation has attracted increasing attention in the environmental area. In this study, the driving of pyrite-based Cr(VI) reduction by Acidithiobacillus ferrooxidans was systematically investigated.
Xinxing Liu (209373), Min Gan (3524228), Guanzhou Qiu (579966), Haiyan Wu (257197)   +3 more
core   +1 more source

Effects of indigenous bacteria on Cr(VI) reduction in Cr-contaminated sediment with industrial wastes

, 2006
Black, clay-like sediments have been obtained from the area of the pigment manufacturing factories in Dongducheon city, Korea. These sediments were contaminated by heavy metals, especially chromium (700 mg/kg).
Chon, H.T., Lee, J.S., Lee, J.-U., Lee, S.E.   +3 more
core   +1 more source

Redução de cromo hexavalente por bactérias isoladas de solos contaminados com cromo Reduction of hexavlent chromium by isolated bacteria of contaminated soils with chromium

Ciência Rural, 2007
A redução do Cr(VI) para Cr(III) diminui a toxidade deste metal no ambiente, uma vez que o Cr(III) é insolúvel às membranas biológicas. Assim, a redução microbiana do Cr(VI) é uma alternativa para reduzir os impactos ambientais causados por este metal ...
Daniele Conceição, Rodrigo Jacques, Fatima Bento, Amauri Simonetti, Pedro Selbach, Flavio Camargo   +5 more
doaj   +1 more source