An Experimental Study on Ammonia-Nitrogen Removal from Waste Water with Modified Absorbent

In order to search for an effective adsorbent on ammonia-nitrogen, a comparative study has been conducted on bentonite, zeolite and fly ash, which have been modified by hydrochloric acid, sodium hydroxide，sodium chloride and thermal to reveal ammonia nitrogen removal efficiency, respectively. The results showed that the modified zeolite of sodium chloride was an ideal adsorbent. The adsorption mechanism of sodium chloride-modified adsorbent was demonstrated via the Scanning Electron Microscope(SEM) analyses and relative theories. The removal percentage of ammonia-nitrogen could be as high as 88.34 % when the dosage of initial ammonia-nitrogen was 30 mg/L, the pH value was 8, the stirring intensity was 150 r/min, the dosage of modified zeolite was 20 g/L and the adsorption time was 120 min, which increased by 20 % than unmodified zeolite. The adsorption of sodium chloride-modified zeolite to ammonia-nitrogen is a superior adsorbent.