Cocoa husk bioadsorption: A sustainable solution for lubricant wastewater treatment

This research evaluated the effec veness of cocoa husk (Theobroma cacao L.) as a bioadsorbent for removing heavy metals from an auto service lubricant wastewater.To produce flour par cles with sizes of 850 m and 1 mm, cocoa husks were dehydrated, ground and sieved.Pb and Al levels in the effluent were ini ally 0.017 ppm and 1.016 ppm, correspondingly.Four different treatments, each with a different par cle diameter (850 m and 1 mm) and dosage of cocoa husk (10 and 15 g), were evaluated using a Completely Randomized Design (CRD) with a 2 2 factorial arrangement.These tests were carried out with a pH of 4 and a 6-hour exposure period.The ability of each treatment to extract Pb and Al from the wastewater was remarkable.The greatest removal effec veness, however, was shown by treatment T2, which used 15 g of 850 m cocoa husk flour and reduced the concentra on of Pb by 94.12% and the concentra on of Al by 46.49%.These results indicate cocoa husk flour's significant poten al as a bioadsorbent for the efficient treatment of wastewater polluted with heavy metals.