期刊
WATER SCIENCE AND TECHNOLOGY
卷 78, 期 6, 页码 1417-1425出版社
IWA PUBLISHING
DOI: 10.2166/wst.2018.420
关键词
ammonium removal; ion exchange; regeneration; synthetic zeolite; zeolite activation
资金
- Ministry of Trade, Industry and Energy (MOTIE, Korea) under KETEP [20162220100260]
- Next-Generation Biogreen 21 Program (SSAC) - Korean government RDA (Rural Development Administration) [PJ013128]
- National Research Foundation of Korea (NRF) - Korea government (MEST) [NFR-2018R1D1A1B07046920]
- Korea Evaluation Institute of Industrial Technology (KEIT) [20162220100260] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
In this study, the optimum ammonium removal by activation of synthetic zeolite in the aqueous phase was investigated by batch ion exchange adsorption assay, and its surface changes due to activation modification was elucidated accordingly. Among the adsorbents examined, modified synthetic zeolite A-4 was the most effective at ammonium removal. The best activation condition of zeolite A-4 was established by Na+ thorn and 300 degrees C heat treatment at pH around 6 to 7. Besides, the removal efficiency was investigated under various reaction conditions of pH, adsorbent dosage, stirring speed, and initial ammonium concentration. Finally, the adsorptive capacity Q(e) of synthetic zeolite A-4 activated by Na+ thorn and heat treatment was determined as 31.9 mg/g at 1,000 mg-N/L of ammonium, whereas that of natural zeolite was measured as 16.0 mg/g. The obtained adsorption data was fitted to both Langmuir and Freundlich isotherm models, and the Langmuir isotherm model provided a better correspondence than the Freundlich isotherm. Finally, regeneration cycles for synthetic zeolite A-4 was determined for further industrial applications and efficient ammonium removal.
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