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Updated: Aug 15, 2025
08:01
Removal of Arsenic Using a Cationic Polymer Gel Impregnated with Iron Hydroxide
Published on: June 28, 2019
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A hybrid ultrafiltration membrane process using a low-cost laterite based adsorbent for efficient arsenic removal
1Department of Polymer and Process Engineering, Indian Institute of Technology Roorkee, Saharanpur Campus, Saharanpur 247001, UP, India.
Chemosphere
|January 5, 2023
Summary
Combining laterite-derived adsorbent with ultrafiltration offers effective arsenic removal for large water supplies. Adding sand filtration improved permeate flux, showing a viable, safe, and cost-effective solution for contaminated water remediation.
Area of Science:
- Environmental Engineering
- Water Treatment Technologies
- Materials Science
Background:
- Adsorption is effective for arsenic removal but challenges exist in scaling up for centralized water systems.
- Integrating adsorption with membrane processes like ultrafiltration can enhance large-scale arsenic remediation.
- Low-cost adsorbents are crucial for developing sustainable water treatment solutions.
Purpose of the Study:
- To evaluate a hybrid adsorption-ultrafiltration (Ads-UF) system using a laterite-derived adsorbent (LDA) for arsenic removal.
- To assess the impact of intermediate sand filtration (SF) on system performance and permeate flux.
- To analyze the safety and cost-effectiveness of the developed arsenic remediation strategy.
Main Methods:
- A pilot-scale study combining LDA with cross-flow ultrafiltration (Ads-UF) was conducted.
- Two configurations were tested: Ads-UF and Ads-SF-UF (with intermediate sand filtration).
- Permeate flux was measured at varying transmembrane pressures (0.2-0.6 MPa); resistance models were applied.
Main Results:
- The Ads-SF-UF configuration showed a 28% lower flux decline over 12 hours compared to Ads-UF at 0.6 MPa.
- Spent LDA retained its elemental composition and passed TCLP, indicating safe disposal.
- Cost estimation for a 200 m³/day facility was provided.
Conclusions:
- The hybrid Ads-SF-UF system is a promising strategy for large-scale arsenic removal from contaminated water.
- The inclusion of sand filtration significantly improves permeate flux stability.
- The LDA is a safe, cost-effective adsorbent suitable for practical water treatment applications.
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