Oil palm empty fruit bunches (Elaeis guineensis Jacq.) are one of the production residues in the form of solid waste that has the potential as activated charcoal as an Escherichia coli (E. coli) adsorbent. The presence of cellulose in oil palm empty fruit bunches plays an important role as a carbon source in adsorbing E. coli. This study aims to determine the variation of adsorbent dosage and c…