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Adsorbent selection for pesticides removal from drinking water
José Augusto Alves Pimenta1, Amanda Alcaide Francisco Fukumoto1, Tiago Bervelieri Madeira2
1Civil Construction Department, State University of Londrina - Technology and Urbanism Center.
Environmental Technology
|November 5, 2020
Summary
The purity of pesticide products significantly impacts removal efficiency in water treatment. Granular activated carbon (GAC) proved most effective, highlighting the importance of selecting appropriate adsorbents for pesticide removal.
Area of Science:
- Environmental Chemistry
- Water Treatment Technologies
- Adsorption Science
Background:
- Pesticides in water pose health risks due to bioaccumulation.
- Conventional water treatment struggles with low-molecular-weight dissolved compounds.
- Effective pesticide removal necessitates advanced adsorbent selection.
Purpose of the Study:
- To evaluate pulverized activated carbon (PAC), granular activated carbon (GAC), and carbon nanotubes (CNTs) for pesticide adsorption.
- To assess the influence of commercial product (CP) versus analytical standard (SD) forms on adsorption efficiency.
- To provide data for selecting optimal adsorbents in water treatment plants.
Main Methods:
- Adsorption experiments using PAC, GAC, and CNTs with atrazine, simazine, and diuron.
- Comparison of adsorption efficiencies using commercial product (CP) and analytical standard (SD) forms.
- Analysis of adsorbent characteristics (e.g., BET surface area) and adsorption isotherms (e.g., Kf parameter).
Main Results:
- Adsorption efficiency was significantly influenced by the form of pesticide application (CP vs. SD).
- Granular activated carbon (GAC) demonstrated the highest efficiency in removing pesticides.
- Chemical adsorption was the primary mechanism across all tested materials.
- The Kf parameter proved a useful tool for adsorbent selection.
Conclusions:
- Adsorbent selection for pesticide removal must consider the form of the compound (CP vs. SD).
- Granular activated carbon (GAC) is a highly effective adsorbent for the studied pesticides.
- Accurate adsorbent selection is critical for successful pesticide removal in water treatment.
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