Study on thermodynamic and kinetic of ammonia in water body adsorbed by zeolite

The treatment of ammonia in wastewater has attracted more and more attention due to the aggravation of eutrophication of natural water body recently.Jinyun of Zhejiang Province is rich in zeolite minerals,and thus the research on adsorption of zeolite has obvious practical value.The experimental results showed that temperature had little effect on ammonia adsorption within the range of 288-318 K.The removal rate of ammonia is 91% within 48 h while the initial concentration of ammonia is 30 mg/L and the adsorption capacity is 1.13±0.06 mg/g for little particle size of zeolite.While for big zeolite,87% ammonia is removed within 48 h and the adsorption capacity is 1.10±0.06 mg/g.The adsorption process was found to follow the second order kinetic model.The adsorption thermodynamic could be described by both Freundlich and Langmuir.The result indicated that zeolite is a suitable absorbent and can be used in the removal of ammonia in wastewater or natural water body.