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Pesticide (acephate) removal by GAC: a case study
1Department of Sanitary Engineering, All India Institute of Hygiene & Public Health, 110, C.R. Avenue, Calcutta-700 073.
Indian Journal of Environmental Health
|September 25, 2003
Summary
Granular activated carbon effectively removes the pesticide acephate from industrial wastewater. This study demonstrates GAC
Area of Science:
- Environmental Chemistry
- Water Treatment Technologies
Background:
- Pesticides, such as acephate, are persistent pollutants posing risks to ecosystems and food chains.
- Industrial effluents often contain hazardous pesticide residues requiring efficient removal methods.
Purpose of the Study:
- To evaluate the efficacy of granular activated carbon (GAC) for removing acephate from industrial wastewater.
- To determine optimal conditions and adsorption characteristics for acephate removal using GAC.
Main Methods:
- Batch adsorption experiments were conducted to determine the optimal GAC dosage and equilibrium time.
- Adsorption kinetics and capacity were analyzed using the Langmuir isotherm model.
- A column system was designed using the bed depth-service time (BDST) approach.
Main Results:
- An optimal GAC dosage of 85 gm/litre achieved nearly 100% acephate removal from an initial concentration of 2.9 mg/litre.
- Adsorption equilibrium was reached at 80 minutes, with an adsorptive capacity of 0.04614 mg/gm.
- Experimental parameters for the BDST approach were determined as 'a' = 6.125 and 'b' = 47.75.
Conclusions:
- Granular activated carbon is a highly effective adsorbent for removing acephate from industrial effluents.
- The study provides valuable data for designing GAC-based water treatment systems for pesticide removal.