محبوبه ضرابی

Sorption potentials of mineral and organic materials for ammonium nitrogen (NHþ 4 N) removal from aqueous solution were investigated. Batch adsorption studieswere performed as a function of pH, contact time, and adsorbent dosage. Isotherm experiments were carried out by concentrations of NHþ 4  N ranged from0 to 1000 mg NHþ 4  N=l. The adsorption equilibrium was described well by the Langmuir and Freundlich isotherm models. The maximum adsorption capacities of NHþ 4  N decrease in this order: Zeolite> Bentonite> Canola residue> Municipal waste compost > Mushroom compost > Calcite > Kaolinite> Wheat bran. The energy of adsorption in mineral adsorbent ranged from 0.0014 L/mg (Kaolinite) to 0.0105 L/mg (Zeolite), while it was ranged from 0.0016 L/mg (Municipal waste compost) to 0.0033 L/mg (Wheat bran) in organic adsorbents. Our finding showed that organic adsorbents can be used as a novel and low-cost absorbents to remove NHþ 4  N from wastewater