Performance of NaCl-Modified Artificial Zeolite in Removing Ammonia Nitrogen From Wastewater and Its Influencing Factors

NaCl solution was used to modify artificial zeolite to explore effect of concentration of NaCl on removal of ammonia nitrogen.Through surface characteristics analysis,static adsorption experiments and adsorption isotherm analysis,comparison was done between artificial zeolite and modified artificial zeolite in ammonia nitrogen adsorption.X-ray diffraction(XRD) analysis revealed that the modification made surface of the zeolite rougher,and the zeolite display diffraction peaks characteristic of NaCl crystals at the same time.The experiment demonstrated that modification of zeolite with 1.0 mol·L-1 NaCl was the best in effect.And the effect of modified zeolite adsorbing ammonia nitrogen was optimal when 1.0 g zeolite was applied to treat 50 mL of wastewater,6.52 in pH,and containing 10 mol·L-1 of ammonia nitrogen for 40 min at 25 ℃,removing 96.02% of the ammonia nitrogen in the wastewater as compared to 87.18% for raw zeolite.Both the Langmuir and Freundlich isotherm equations fit well the processes of the two types of zeolites adsorbing ammonia nitrogen.The saturated ammonia nitrogen adsorption capacity(21.46 mg·g-1) of modified artificial zeolite is much higher than that of unmodified artificial sorbent(9.03 mg·g-1).