Simha, Prithvi
- Department of Energy and Technology, Swedish University of Agricultural Sciences
Abstract
Human urine contributes up to 50 % of the phosphorus load in domestic wastewater. Decentralized sanitation systems that separately collect urine provide an opportunity to recover this phosphorus. In this study, we leveraged the unique and complex chemistry of urine in favor of recovering phosphorus as vivianite. We found that the type of urine affected the yield and purity of vivianite, but the kind of iron salt used, and reaction temperature, did not affect the yield and purity. Ultimately, it was the urine pH that affected the solubility of vivianite and other co-precipitates, with the highest yield (93 & PLUSMN; 2 %) and purity (79 & PLUSMN; 3 %) of vivianite obtained at pH 6.0. Yield and purity of vivianite were both maximized when Fe:P molar ratio was >1.5:1, but
Keywords
Decentralized sanitation; Fertilizers; Nutrient recycling; Resource recovery; Stabilization; Wastewater treatment
Published in
Science of the Total Environment
2023, volume: 892, article number: 164517
Publisher: ELSEVIER
SLU Authors
Global goals (SDG)
SDG6 Clean water and sanitation
SDG12 Responsible consumption and production
UKÄ Subject classification
Water Treatment
Publication identifier
- DOI: https://doi.org/10.1016/j.scitotenv.2023.164517
Permanent link to this page (URI)
https://res.slu.se/id/publ/123001