Phosphorus Recovery from Biofilm-Enriched Sewage by Fluidized Bed Crystallization of Vivianite
Existing techniques to recover phosphorus as vivianite from urban sewage face difficulties in separating the crystals from the sludge. This study proposes a new process for the recovery of phosphorus as vivianite crystals through fluidized bed crystallization (FBC) from biofilm-enriched phosphorus solution (up to 179.5 mg·L −1 ). The impact of process parameters on the phosphors recovery (PR), the crystallization ratio (CR), and the crystal size were examined. Under optimized conditions, i.e., 140 mg·L −1 phosphorus in the raw water, 15 m/h liquid up-flow velocity, and 5 h hydraulic retention time, a single batch of the FBC reaction could attain a high PR of 95.30% and a high CR of 88.23%. After seven consecutive batches of the FBC reaction, large vivianite crystals (d 50 = 270.52 mm) could be obtained. The identity of the collected vivianite crystals was verified by X-ray diffraction (XRD), scanning electron microscopy (SEM-EDS), and X-ray photoelectron spectroscopy (XPS). The proposed process shows very good potential as it can turn urban sewage into a valuable resource from which phosphorus can be efficiently recycled
Year of publication: |
[2022]
|
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Authors: | Zhou, Jian ; Pan, Yang ; Huang, Yong ; Li, Dapeng ; Feng, Xin |
Publisher: |
[S.l.] : SSRN |
Saved in:
freely available
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