This study aims to investigate the adsorption capacity of ammonium NH4 + , nitrite NO2 - and nitrate NO3 - onto rice husk biochar (RHB) obtained from 550 °C pyrolysis temperature in the context of using low-cost absorbent for recirculating aquaculture system (RAS). Raw RHB at its original size 5–8 mm has been chosen for testing its adsorption capacity as well as several key material properties (pHPZC, surface area, and elemental analysis). |