Rice husk emerges as low-cost decolorant for textile wastewater

Sabrina Mostafa, Senior Scientific Officer at IGCRT-BCSIR and PhD researcher at RMIT University, confirmed through collaborative research that rice husk—after simple physical activation—effectively adsorbs common reactive and acidic dyes from textile effluent. Its abundance and low cost make it especially relevant for small- and medium-scale dyeing units with constrained resources.

Compared to conventional decolorants such as granular activated carbon or polymeric flocculants, rice husk-based adsorbents require no complex regeneration process. Spent material can be repurposed as fuel supplement or construction filler, reducing end-of-life disposal pressure. The approach avoids chemical modification or nanosynthesis, keeping the process straightforward and adaptable to retrofitting existing wastewater treatment units.

The findings remain at the laboratory validation stage; no pilot-scale trials or commercial deployment have been reported. Researchers note performance sensitivity to husk origin, bulk density, and influent pH—meaning site-specific feasibility testing is essential before adoption.

What it means for fabric buyers: If proven stable at scale, fabric buyers may encourage partner dye houses to trial rice husk-based decolorization—potentially lowering compliance-related operational costs. For orders destined to EU or North America, this pathway could support responsiveness in green supply chain reporting, but it does not affect fabric specifications, lead times, or certification obligations.