The researchers tested different coagulants and membranes to clean up wood processing wastewater. They found that using alum at 500 mg/L dosage and pH 7 removed 99.5% of turbidity, reduced COD by 89.8%, and decreased color by 51.1%. Natural coagulant PMOP at 2000 mg/L also worked well, removing 98.9% of turbidity, 84.7% of COD, and 73.7% of color. After membrane filtration, the best results were achieved with NF90 membrane at 20 bar pressure, removing 99.9% of turbidity, 99.5% of COD, and 99.4% of color with alum pre-treatment. Using PMOP with NF90 at 20 bar pressure decreased turbidity by 99.6%, COD by 93.0%, and color by 99.5%.