Abstract
Plywood industrial wastewater can cause heavy pollution to the environment. The wastewater treatment system will be determined by the parameters of the liquid waste produced. This study was aimed to reduce the wastewater contamination level in the plywood industry. The method consisted of sedimentation, coagulation, flocculation, aeration, sand filtration, activated carbon adsorption, and ion exchange. The wastewater was pumped into the reservoir and conditioned to a pH of 6 – 7 and allowed to stand for 2 (two) hours for sedimentation. The blower with a speed of 50 rpm was turned for aeration. Then the wastewater was sand filtrated and absorbed by activated carbon. The wastewater flowed into the anion-cation resin tank for ion exchange. The treated effluent filtrate was analyzed for Biological Oxygen Demand (BOD5), Chemical Oxygen Demand (COD), Total Suspended Solid (TSS), Phenol, and total ammonia (NH3). The results showed that the decrease of BOD5; COD; TSS; phenol; and NH3 was from 1,426 ppm to 30,5 ppm (97.9%); 2,545.7 to 34.7 ppm (98.6%); 865 ppm to 9.65 ppm (98.9%); 56.98 ppm to 1.45 ppm (97.5%); and 1,652 ppm to 4.56 ppm (99.7%).
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