Nitrogen compounds are one of the several materials in the
   wastewaters and effluents that have harmful effects in water resources. In
   different  experiences  , Ion  Exchange (IE)  with  Zeolites  were   used  for
   removal of Ammonia-nitrogen. The aim of this research was studying the 
   application of Semnan’s Zeolite for removal of Ammonium in both Batch 
   and  Continous  systems . 

          The Zeolite  Clinoptilolite  was  supplied  by  Semnan  area  mines . The 
   Zeolite  was  ground  and  sieves  based  on  U.S. standard  mesh  number 
   20 , 30 , 40  and  then conditioned by Ammonium Sulfate  and  Sodium 
   Chloride  solutions  respectively .

          The test results on conditioned  samples  in  Batch  system   was showed
   that average Ion  Exchange   capacity  for  particles  with  20  ,  30  and 40
   mesh were between  6.65 - 16 mg NH₄⁺ / g  Zeolite  weight .        

   Forthermore  its  selectivity for other  cations obtained the ranking of K , NH₄ ,
   Na , Ca , Mg  respectivly . In  Continous  system  , total  cation  exchange 
   and  till  breakthrough  point  capacity  obtain  16.31 - 19.5  and  7.61 - 11.23
   mg NH₄⁺ / g Zeolite  weight .  The  resultes  indicated  that  high  level  of 
   regeneration  (95 - 98%) may  be  achieved  with  solution  of  NaCl .

          At present time, the  most  wastewater  treatment  plant  in  our  country 
   designed  for  removal  of  organic  matter  and  Ammonium  remain  in 
   effluent , and the  use  of  Ion  Exchange  with  Clinoptilolite  can  be  led  to 
   economical  remove  of  NH₄ ⁺ from  effluent  .