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Effects of supersaturation control strategies on hydroxyapatite (HAP) crystallization for phosphorus recovery from wastewater
Abstract
The HAP crystallization for phosphorus removal from wastewater contributes to an environmental friendly production due to the fact that it helps reduce or eliminate the water eutrophication as well as increases the recovery of mineral resources. However, the generated microcrystalline with poor settleability in high levels of supersaturation solution has a negative effect on the phosphorus recovery efficiency. To overcome the drawback, multiple reagent feed ports (four feed ports) and different recirculation ratio (1.0, 1.5, 2.0, 2.5, 3.0) were investigated to control the levels of supersaturation in an air-agitated reactor with calcite as seeds. Results showed that the approach of multiple reagent feed ports could improve the conversion ratio of orthophosphate, but it had a limited effect (∼3% improvement) on phosphorus recovery efficiency (deposition on the seeds). With the increase of the recirculation ratio, the recovery efficiency was increased gradually and reached an optimal value of 85.63% under the recirculation ratio of 2.5 and four feed ports. This is because the adopted strategies could reduce the level of supersaturation by diluting the concentration of the reagents and inhibit large numbers of microcrystalline coinstantaneous occurrence. Meanwhile, the crystallized products were detected and analyzed by scanning electron micrograph (SEM) with energy-dispersive spectrometry (EDS) and X-ray diffraction (XRD), which were proved to be HAP with a high purity. Collectively, these results demonstrated that supersaturation control using conventional approaches had a limited improvement on the phosphorus recovery efficiency in the form of HAP, and the new control strategies for supersaturation dispersion should be developed in the further study.
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“Most of these methods are difficult to implement on a large scale, due to complex operation procedures and cost issues [17,18].”
From Efficient Phosphate Removal from Wastewater by Ca-Laden Biochar Composites Prepared from Eggshell and Peanut Shells: A Comparison of Methods (2023) · cites this paper as [17]
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Metadata
- Authors
- Dai, H., Lu, X., Peng, Y., Yang, Z., & Zhsssu, H.
- Affiliations
- Southeast University (CN)
- Corresponding author
- Lu, Xiwu
- Venue
- Environmental Science and Pollution Research
- Published
- 2017-01-04
- Volume
- 24
- Issue
- 6
- Pages
- 5791-5799
- ISSN
- 0944-1344 (ISSN-L)
- 1614-7499
- OpenAlex
- W2567824409
- Cited by
- 41
- References
- 29
- Citations by year
- 2026: 3 · 2025: 8 · 2024: 1 · 2023: 4 · 2022: 3 · 2021: 5 · 2020: 4 · 2019: 4 · 2018: 8 · 2017: 1
- FWCI
- 4.81
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Environmental Science and Pollution Research (publishedVersion)
- PubMed (publishedVersion)
- Funders
- Major Science and Technology Project of Water Pollution Control and Management in China (2012ZX07101005)
- National Science and Technology Support Program in China (2015BAL01B01)
- Research Innovation Program for College Graduates of Jiangsu Province (KYLX15_0073)
- Scientific Research Foundation of Graduate School of Southeast University
- Topics
- Physical Sciences › Environmental Science › Waste Management and Disposal › Phosphorus and nutrient management
- Physical Sciences › Materials Science › Materials Chemistry › Crystallization and Solubility Studies
- Physical Sciences › Environmental Science › Waste Management and Disposal › Wastewater Treatment and Reuse
- Keywords
- hydroxyapatite crystallization, phosphorus recovery, wastewater treatment, supersaturation control, recirculation ratio, eutrophication mitigation
- MeSH terms
- Crystallization, Hydroxyapatites, Phosphates, Phosphorus, X-Ray Diffraction, Water Purification, Wastewater
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