Abstract
Waste coffee beans dregs (coffee grounds) have various recycling methods such as adsorption. In order to reduce and recycle coffee grounds, we try to combust coffee dregs and estimate adsorption experiment of nitrate ion-containing aqueous solution. It was shown that adsorption capacity was 735 [mg/g], and the adsorption data obtained from experiments were well-fitted to Langmuir isotherms. Sieved dregs show 46% by 500-1000 [μm] particles. All data suggested the chemical adsorption type of the nitrate ion and supported a result of non-combusted coffee dregs of the previous report.
