Abstract:

To investigate the activity of the heavy mental in manure of livestock and poultry, the adsorption/desorption processes of Cu2+ and Zn2+ by duck manure were studied. All adsorption thermodynamics processes reached equilibrium within 24 hours with the maximum adsorption capacity being 1245.35 mg/kg (Cu2+), 1129.34 mg/kg (Zn2+) respectively. The adsorption processes of both ions by duck manure fitted well with the Langmuir adsorption mode instead of Freundlich mode. Furthermore, the absorption of Cu2+ followed second-order kinetic law, while that of Zn2+ agreed with the first-order law. The desorption processes of Cu2+ and Zn2+ demonstrated that, desorption capacity was limited and the reaction could reach equilibrium within a rather short time.