Reduction of Ammonia Nitrogen and Chemical Oxygen Demand of Fertilizer Industry Liquid Waste by Coconut Shell Activated Carbon in Batch and Continuous Systems

The fertilizer industry laboratory produces urea and ammonia nitrogen waste that can harm living things in the surrounding water bodies. Urea, nitrogen, and ammonia can be reduced by adsorption using activated carbon. This research reduced urea nitrogen and ammonia through activated carbon adsorption with a batch and continuous system. Percentage indicator of urea and ammonia nitrogen removal through Ammonia Nitrogen (NH3-N) and Chemical Oxygen Demand (COD) NH3-N and COD analysis was determined. This study aimed to obtain: 1) the percentage of NH3-N and COD reduction in stem batch; 2) the percentage of NH3-N and COD reduction in the continuous system; 3) the Freundlich and Langmuir isotherm adsorption equation against NH3-N wastewater. They are testing the adsorption power of activated carbon in a batch system using variable levels of activated carbon: 40 g/L, 55 g/L, 70 g/L, 85 g/L, and 100 g/L and testing the adsorption power of activated carbon in a continu-ous system using the variable frequency of wastewater in contact with activated carbon filter cartridges, namely 2, 3, 4, 5, and 6 times. The results showed: 1) in the batch system NH3-N reduction of 98.26-98.82% and COD reduction of 92.53-97.05%; 2) in continuous system reduction of NH3-N of 86.05-88.07% and COD reduction of 93.91-97.05%; 3) Freundlich isotherm adsorption equation yields constant R2 0.9464, n 0.4482, KF0.0616 mg/g; while Langmuir's isotherm adsorption equation yields constant R2 0.8684, b-0.1046 L/mg, and qm 7.9872 mg/g.