Researchers used oyster mushroom (Pleurotus ostreatus) pellets to remove toxic blue dye commonly found in textile wastewater. The study found that these mushroom pellets achieved 98.5% dye removal through multiple mechanisms: special enzymes (laccase and peroxidase) that break down the dye molecules, and physical absorption where the dye sticks to the mushroom cells. The mushroom could also use the dye as a food source, making this an effective and sustainable approach for cleaning industrial wastewater.