This study explores the potential of sewage sludge as a casing material amendment, focusing on the uptake of metal elements by the cultivated white button mushroom. The research aims to contribute to a more sustainable and environmentally friendly approach to waste management, reducing the environmental impact of sewage sludge disposal. By investigating the effects of sewage sludge on the growth and metal uptake of the mushroom, this study provides valuable insights into the feasibility of using sewage sludge as a casing material, promoting a more circular economy and reducing waste.