Because paper sludge is very sensitive to fungal attacks, itwas immediately dried in an oven at 100 ◦C for 24 h to adjust it to amoisture content of approximately 2–3%. Itwas then ground in a laboratorymill and screened through a mesh screen to obtain a desirable paper sludge size. Paper sludge was classified by size; small (2–3cm×2–3cm×1–2 cm) and large (3–4cm×3–4cm×1.5–2.5 cm).