Innovative capacitive deionization-degaussing approach for improving adsorption/desorption for macadamia nutshell biochar

Adsorption is a well known effective technology for water treatment. Although limited capacities of adsorbents and regeneration issues are two common challenges. This study proposed tested innovative approaches improving adsorption/desorption biochar made from macadamia nutshell (MBC). These capacitive deionization (CDI) degaussing (full process detailed in methods), the respective enhancement adsorption desorption MBC. Nitrate was used as model contaminant. It found that CDI could extend saturation time MBC by increasing bed specific throughput 10 fold. Modeling breakthrough curves showed modified dose-response fits experimental data. The with deionized backwash compared conventional tap backwash. Degaussing increased maximum nitrate recovery 50% to 73%. In comparison, 23%. improvement holds only first 60 min. obtained charge efficiency MBC-CDI slightly higher than literature values same applied voltage (78,6%). system also proven be efficient energy consumption 43,7 J/mmol NO3?. possible mechanism behind removal static charges on ion hydration. regenerated fresh exhibited better cycles.