Oil palm empty fruit bunch charcoal (Elaeis guineensis Jacq.) is a potential raw material that can be utilized as an adsorbent for Escherichia coli (E. coli). The cellulose content in the empty fruit bunch charcoal acts as a carbon source in the E. coli adsorption process, whose efficiency can be enhanced through an activation process using ZnCl₂ as an activating agent. The addition of ZnCl2…