Oil palm midribs (Elaeis guenensis Jacq.) are one of the wastes from oil palm plantations. The high carbon element composition in the palm midribs has the potential to be used as charcoal or activated carbon. Activated carbon can reduce COD levels in tofu industrial wastewater. This study aims to determine the effect of activated carbon mass and contact time on decreasing COD levels in tofu industrial wastewater. Palm midrib charcoal was activated using HCl 1N with the independent variable of activated charcoal mass (1, 3, 5, 7, and 9 grams) and contact times (30, 60, 90, 120, and 150 minutes), while the dependent variable was the percentage decrease COD levels. Activated charcoal from the palm midribs was in accordance with SNI 06-3730-1995 concerning the Quality Standard of Activated Charcoal. The effect of the adsorbent mass showed that the mass increase in activated charcoal was directly proportional to the percentage decrease in COD levels in the tofu industrial wastewater, while the optimum contact time of activated charcoal was obtained at 60 minutes with a decrease in COD levels of 82.13%.
This community service activity aims to increase the knowledge and skills of housewives in Dalaka Village by processing organic waste from household waste into eco-enzyme products. This service was implemented through counseling and training in making fermenters and making eco-enzymes with simple and inexpensive methods. The production of eco-enzymes was done using the ratio of 3kg of organic waste, 1 kg of brown sugar, and 10L of water. The instrument for evaluating this activity used a satisfaction questionnaire form and was analyzed descriptively. The results of this dedication showed that partners could understand well the technology introduced and apply it. The resulting eco-enzyme product had a brown color and a distinctive sour aroma. The average level of participant satisfaction was in the "satisfied" range. Utilization of organic waste from household
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