Multi-Response Optimization of Process Parameters for Imidacloprid Removal by Reverse Osmosis Using Taguchi Design.

Area of Science:

• Environmental Science
• Chemical Engineering
• Water Treatment Technologies

Background:

• Imidacloprid is a widely used insecticide, posing risks to water quality.
• Effective removal of imidacloprid from water is crucial for environmental protection.
• Reverse osmosis (RO) is a promising technology for water purification.

Purpose of the Study:

• To optimize imidacloprid removal efficiency using reverse osmosis.
• To apply Taguchi's robust design for multi-response optimization.
• To identify optimal operating conditions for maximum contaminant rejection and permeate flux.

Main Methods:

• Utilized Taguchi's robust design for experimental optimization.
• Investigated the impact of membrane type, transmembrane pressure (TMP), volume reduction factor (VRF), and pH.
• Evaluated multi-response characteristics including total dissolved solid (TDS), conductivity, imidacloprid, and total organic carbon (TOC) rejection ratios, and permeate flux.

Main Results:

• Optimized conditions: BW30 membrane, TMP of 30 bar, VRF of 3, and pH 11.
• Achieved high rejection rates: TDS (97.50%), conductivity (97.41%), imidacloprid (97.80%), and TOC (98.00%).
• Permeate flux reached 30.60 L/m²·h; membrane type was the most significant factor (64% contribution).

Conclusions:

• Taguchi's method effectively optimized RO for imidacloprid removal.
• The BW30 membrane under specific conditions demonstrated high efficiency in removing imidacloprid and other contaminants.
• The findings provide valuable insights for designing efficient water treatment systems for pesticide-contaminated water.