A Study on Ammonia Nitrogen, Phosphorus and Organic Pollutants Removal of Zeolites by Salt Modification

Abstract:

In this study, the zeolites were treated by NaCl and FeCl3 as an active agent, combined with calcination modification. We studied the ammonia nitrogen (NH3-N) and phosphorus (P) removal of the modified zeolites. The results showed that concentration of NaCl and FeCl3 affected NH3-N and P removal of Secondary sewage effluent greatly. The optimal concentrations of NaCl and FeCl3 were 2.0% and 0.4%. At this condition, the NH3-N and P removal rate of zeolites reached the peak. Application experiments revealed that NH3-N removal rate reached 80.9%, P removal rate reached 83.4%, and COD removal rate reached 96.0%, when the dosage of modified zeolites was 3.0g/L and adsorption duration was 2h for Secondary sewage effluent with 6.0mg/L NH3-N concentration and 1.5mg/L P concentration. After the treatment, the NH3-N and P concentration met Reclaimed Water Quality Standards. The adsorption capability of modified zeolites was better when the pH ranged from 3 to 6. The reason of using NaCl+FeCl3 was that Na+ could exchange the NH3-N in the effluent; Fe3+was able to combine with PO43- in the sewage and formed precipitate; and Fe3+ could also oxidize the organic pollutants.

• Periodical: Advanced Materials Research (Volumes 383-390)
• Pages: 947-952
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.383-390.947
• Online since: November 2011
• Authors: Hai Lin, Zhi Ying Zhao, Le Yong Jiang, Wei Wei
• Keywords: Ammonia Nitrogen, Phosphorus, Reclaimed Water, Salt Modification, Zeolite

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