Award Date

5-1-2024

Degree Type

Thesis

Degree Name

Master of Science in Engineering (MSE)

Department

Civil and Environmental Engineering and Construction

First Committee Member

Erica Marti

Second Committee Member

Jacimaria Batista

Third Committee Member

Eakalak Khan

Fourth Committee Member

Jaeyun Moon

Number of Pages

89

Abstract

Among the hundreds of pesticides and insecticides, pyrethroids-particularly permethrin and bifenthrin, have become very popular due to their high toxicity to insects and low toxicity to humans, leading to extensive use in both agriculture and urban areas. Pyrethroids have no discharge limits because of this, leading to a negative impact on surrounding ecosystems due to their high toxicity to fish and aquatic life. Due to their low solubility and long half-lives, they are prominent in the environment long after application with a high potential for getting transported in runoff water to nearby water bodies. In this study, DSR-C reactivated carbon from Calgon Carbon was tested as an adsorbent for permethrin and bifenthrin from deionized water. Pyrethroid samples were extracted from water by liquid-liquid extraction and analyzed using a UV-vis spectrophotometer. Isotherm data was best represented by the Langmuir model suggesting single-layer adsorption with an adsorption capacity of 149 mg/g for permethrin and 0.822 mg/g for bifenthrin. Permethrin adsorption was studied further in solutions containing 200 mg/L of sulfate and 10 mg/L of nitrogen, phosphorus, and potassium fertilizer nutrients to simulate realistic agricultural runoff conditions. Across all three water matrices used (DI water, 10 mg/L N-P-K, and 200 mg/L sulfate), kinetic data for permethrin adsorption was best represented by the pseudo-second order kinetic model with similar kinetic rates and equilibrium capacities. Isotherm data represented by the Langmuir model resulted in an average adsorption capacity of 155 ± 39 mg/g across three different water matrices. Adsorption with DSR-C is an effective treatment process for permethrin in agricultural runoff water.

Keywords

activated carbon; adsorption; bifenthrin; permethrin; pyrethroid

Disciplines

Environmental Engineering

File Format

pdf

File Size

4000 KB

Degree Grantor

University of Nevada, Las Vegas

Language

English

Rights

IN COPYRIGHT. For more information about this rights statement, please visit http://rightsstatements.org/vocab/InC/1.0/

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Available for download on Thursday, May 15, 2025


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