A breakthrough column study for removal of malachite green using coco-peat

Area of Science:

• Environmental Science
• Water Treatment Technology
• Adsorption Science

Background:

• Malachite green (MG) is a toxic dye commonly found in textile industry wastewater.
• Effective and sustainable methods are needed for the removal of MG from contaminated water sources.

Purpose of the Study:

• To investigate the efficacy of coco-peat (CP) as a bio-sorbent for continuous removal of malachite green (MG) in a fixed-bed column.
• To evaluate the field application viability and optimize parameters for dye removal using coco-peat.

Main Methods:

• Continuous adsorption experiments were conducted in a fixed-bed column using coco-peat.
• Parameters such as particle size, pH, concentration, dose, and interference were optimized.
• Breakthrough curve data were analyzed using Thomas and BDST models to assess adsorption performance.

Main Results:

• The Thomas model yielded a rate constant K of 0.22 ml min⁻¹ mg⁻¹ and an adsorption capacity q₀ of 181.04 mg g⁻¹, indicating efficient MG removal.
• The BDST model predicted a maximum dye uptake of 468.26 mg/l at an input dye concentration of 5 mg/l.
• Thomas model demonstrated the best fit for the experimental data, and dilute hydrochloric acid proved effective for desorption.

Conclusions:

• Coco-peat is a promising and cost-effective bio-sorbent for the continuous removal of malachite green from contaminated water in fixed-bed columns.
• The study confirms the potential for large-scale industrial application, supported by analysis of real textile industry wastewater.