The feasibility of hybrid systems for simultaneous removal of nitrate (NO3-) and ammonium ions (NH4+) from livestock wastewater was examined in batch experiments. As a part of efforts to remove nitrate and ammonium simultaneously, Fe and adsorbents including coconut-based granular activated carbon (GAC), sepiolite and filtralite were used. Various parameters such as adsorbent dosages and temperature were studied. Removal of NO3- increased with increase in temperature. Maximum NO3- removal (85.3%) was observed for the Fe-filtralite hybrid system at 45C for a 24h reaction time. Increase in GAC and sepiolite dosages had significant (P<0.01) effect on the NH4 + removal efficiency, which was primarily due to the net negative surface charge of the adsorbents. The efficiency of hybrid systems for the removal of NO3- was in the order of filtralite> sepiolite>GAC, and the order of the removal of NH4+ was GAC>sepiolite>filtralite. The results of the present study suggest that the use of hybrid systems could be a promising innovative technology for achieving simultaneous removal of NO3- and NH 4+ from livestock wastewater.
Bibliographical noteFunding Information:
This work was supported by the Senior Researchers (National Research Foundation of Korea, 2010-0026904), the Brain Korea-21 (BK-21) program of the ministry of Education, Science & Technology (MEST) in 2009 (K20815000002) and the Global Research Laboratory (GRL) Program (Count number: 2010-00248).
- granular activated carbon
- livestock wastewater