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Related Concept Videos

Microbial Leaching01:27

Microbial Leaching

Microbial leaching, also known as bioleaching, is an environmentally favorable method for extracting metals from low-grade ores using specific microorganisms. This biotechnological approach is particularly valuable for mining operations targeting copper, gold, and uranium, where traditional extraction methods may be economically or environmentally impractical.Copper Leaching and Microbial CatalysisIn copper bioleaching, crushed ore is arranged into heaps and irrigated with a dilute sulfuric...
Acid Mine Drainage01:19

Acid Mine Drainage

Mining activities that disturb sulfide-rich rocks, particularly those containing pyrite (FeS₂), initiate a cascade of geochemical and microbiological processes with serious environmental implications. When exposed to air and water, pyrite undergoes oxidation, releasing sulfate, ultimately forming sulfuric acid and mobilizing heavy metals into surrounding water systems. This phenomenon, known as acid mine drainage (AMD), results in low pH waters laden with toxic elements that threaten aquatic...
Precipitation and Co-precipitation01:17

Precipitation and Co-precipitation

Precipitation and coprecipitation methods can be used to separate a mixture of ions in a solution. In qualitative inorganic analysis, ions that form sparingly soluble precipitates with the same reagent are separated based on the differences in solubility products. For example, consider the separation of Cu(II) and Fe(II) ions by precipitation as insoluble sulfides. First, copper(II) sulfide is precipitated by the addition of acidic H2S, where the dissociation of H2S is suppressed. Adding H2S...
Microbial Bioremediation of Uranium01:25

Microbial Bioremediation of Uranium

Microorganisms play a critical role in the transformation and immobilization of uranium in contaminated environments through four main pathways: bioreduction, biosorption, bioaccumulation, and biomineralization. These mechanisms reduce uranium’s toxicity and prevent its migration through groundwater systems, offering sustainable approaches for in situ bioremediation.Bioreduction of UraniumBioreduction is driven by anaerobic bacteria such as certain strains of Geobacter and Shewanella, which use...
Extraction: Advanced Methods00:56

Extraction: Advanced Methods

Metal ions can be separated from one another by complexation with organic ligands–the chelating agent– to form uncharged chelates. Here, the chelating agent must contain hydrophobic groups and behave as a weak acid, losing a proton to bind with the metal. Since most organic ligands used in this process are insoluble or undergo oxidation in the aqueous phase, the chelating agent is initially added to the organic phase and extracted into the aqueous phase. The metal-ligand complex is formed in...
Microbes and Other Elemental Cycles01:24

Microbes and Other Elemental Cycles

Microbial activity plays a pivotal role in the biogeochemical cycling of iron and manganese, especially at the redox gradients characteristic of stratified aquatic environments. These cycles are driven by microbial transformations between oxidized and reduced forms of the metals, allowing organisms to exploit them for metabolic energy and structural purposes.Iron Cycling Across Redox GradientsIn neutral, oxygen-rich surface waters, iron is predominantly found in its oxidized, insoluble ferric...

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Updated: Jun 17, 2026

Removal of Arsenic Using a Cationic Polymer Gel Impregnated with Iron Hydroxide
08:01

Removal of Arsenic Using a Cationic Polymer Gel Impregnated with Iron Hydroxide

Published on: June 28, 2019

Arsenic removal from aqueous solution using ferrous based red mud sludge.

Yiran Li1, Jun Wang, Zhaokun Luan

  • 1State Key Laboratory of Environmental Aquatic Chemistry, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, PO Box 2871, Beijing 100085, PR China. lyr2006xd@yahoo.com.cn

Journal of Hazardous Materials
|December 26, 2009
PubMed
Summary
This summary is machine-generated.

Ferrous-based red mud sludge (FRS) effectively removes arsenic from drinking water, achieving low turbidity. This cost-effective material shows promise for arsenic water treatment in rural communities.

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Experimental Column Setup for Studying Anaerobic Biogeochemical Interactions Between Iron (Oxy)Hydroxides, Trace Elements, and Bacteria

Published on: December 19, 2017

Area of Science:

  • Environmental Science
  • Water Treatment Technology
  • Materials Science

Background:

  • Arsenic contamination in drinking water poses significant health risks, particularly in rural areas.
  • Existing water treatment methods can be costly or inefficient for low-concentration arsenic removal.
  • Developing effective and economical arsenic removal solutions is crucial for public health.

Purpose of the Study:

  • To develop and evaluate a novel Ferrous-based Red Mud Sludge (FRS) for low arsenic water treatment.
  • To assess the efficiency of FRS in removing Arsenic(V) from aqueous solutions.
  • To investigate the performance of FRS under various environmental conditions relevant to rural water supplies.

Main Methods:

  • Arsenic removal studies using FRS at dosages of 0.2-0.3 g/L.
  • Turbidity measurements of treated water after 24 hours.
  • Evaluation of FRS performance across a pH range of 4.5-8.0.
  • Investigation of the impact of phosphate and carbonate on arsenic removal efficiency.
  • Arsenic fractionation analysis to determine binding mechanisms.

Main Results:

  • FRS effectively removed Arsenic(V) from water at initial concentrations of 0.2-0.3 mg/L with dosages of 0.2-0.3 g/L.
  • Treated water turbidity was consistently below 2 NTU after 24 hours, even for disturbed water.
  • Effective arsenic removal occurred within a natural pH range of 4.5-8.0.
  • Phosphate significantly inhibited arsenic removal, while carbonate had no significant effect.
  • Amorphous hydrous oxide-bound arsenic was the dominant form in FRS, with minimal arsenic release upon pH decrease.

Conclusions:

  • Ferrous-based Red Mud Sludge (FRS) demonstrates high arsenic uptake capability and excellent settlement performance.
  • FRS is a cost-effective material suitable for arsenic removal in rural water treatment applications.
  • The material's effectiveness across a wide pH range and its stability make it a promising solution for arsenic-contaminated water.