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- Title
Co-removal of phosphorus and nitrogen with commercial 201 × 7 anion exchange resin during tertiary treatment of WWTP effluent and phosphate recovery.
- Authors
Wei, Liang-Liang; Wang, Guang-Zhi; Jiang, Jun-Qiu; Li, Guo; Zhang, Xiao-Lei; Zhao, Qing-Liang; Cui, Fu-Yi
- Abstract
Excessive nitrogen and phosphorus discharge into natural water from wastewater treatment plants still have the potential of causing eutrophication. How to remove those excessive nitrogen and phosphorus in an appropriate way is welcome in practice. This study co-removed nitrate and phosphorus via the operation of commercial 201 × 7 exchange resin column, and recovered phosphate simultaneously. Experimental results demonstrated that the adsorption of-P onto the 201 × 7 resin satisfactorily fitted to Freundlich isotherm, while-N followed Langmuir model, with a maximum adsorption capacity of 12.47 mg/g for-P and 107.59 mg/g for-N, respectively. Up to 92% of-P and 90% of-N in the secondary effluent were recovered by 201 × 7 resin column under the optimal flow rate of 50 BV/h. The exhausted 201 × 7 resin could be regenerated by 5% NaCl within 1 h at a flow rate of 15 BV/h. Moreover, this regeneration would guarantee the effluent-P and-N are lower than the breakthrough points even when 1175 BV wastewater passed the resin column. These findings are of great significance for ensuring stricter effluent phosphorus and total nitrogen discharge criteria.
- Subjects
PHOSPHORUS content of sewage; NITROGEN content of sewage; SEWAGE purification; ION exchange resins; PHOSPHATES; EUTROPHICATION
- Publication
Desalination & Water Treatment, 2015, Vol 56, Issue 6, p1633
- ISSN
1944-3994
- Publication type
Article
- DOI
10.1080/19443994.2014.951966