Urea removal in reclaimed water used for ultrapure water production by spent coffee biochar/granular activated carbon activating peroxymonosulfate and peroxydisulfate.
- Publisher:
- ELSEVIER SCI LTD
- Publication Type:
- Journal Article
- Citation:
- Bioresour Technol, 2022, 343, pp. 126062
- Issue Date:
- 2022-01
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This study evaluated the performance of spent coffee biochar (SCBC)/granular activated carbon (GAC) activating peroxymonosulfate (PMS) and peroxydisulfate (PDS) for urea degradation in reclaimed water used for ultrapure water production. Results showed that catalyst and oxidant wielded a great influence on urea removal. Of them, the GAC-PMS system could completely remove urea at the least oxidant (1 g/L) and catalyst dosage (0.2 g/L). GAC activating PMS mainly depended on graphite C structure and minor oxygen functional groups. However, the amounts of urea removed by 600BC-PMS and 900BC-PMS were 57% and 70%, respectively. In the PDS system, the urea removal through GAC-PDS could reach 90%, which mainly depends on the graphite C structure of GAC. Using the same conditions, the urea removal of 900BC-PDS was similar to GAC-PDS, so it has some potential as an alternative to commercial GAC.
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