Jackfruit peel waste from the production of jackfruit chips in Rimbo Panjang, Kampar, Riau is still wasted and has not been used optimally. From several studies it is known that jackfruit peel waste can be used as an adsorbent. To increase the adsorption ability, an activation process was carried out with NaOH and continued with modification using Ca-alginate. This study aims to determine …