Wetsus phosphorus recovery scientists were able to recover the iron-phosphate mineral vivianite from WWTPs equipped without sludge digesters. Within only 2-3 days of anaerobic residence time, the magnetic mineral formed to a similar extent as it would usually in 20-30 days in sludge digesters.
Up to 60% of the phosphorus and 55% of the iron added was present in the crystals, adding further proof to the already-accessible method’s viability.
More advantages that characterize the vivianite formation and recovery are its preventative abilities towards scaling, its easy add-on ability to current plants, and the harvesting of two critical raw material iron and phosphorus.
Prot, T., W. Pannekoek, C. Belloni, A. I. Dugulan, R. Hendrikx, L. Korving, and M. C. M. van Loosdrecht. 2022. “Efficient Formation of Vivianite without Anaerobic Digester: Study in Excess Activated Sludge.” Journal of Environmental Chemical Engineering 10 (3): 107473. https://doi.org/10.1016/j.jece.2022.107473.