Quantification, recovery and valorization of nitrogen and phosphorus from waste streams : strategies towards circular nutrient management
Abstract
Resource-efficient nutrient management is key to secure food production in the context of a growing global population, rising resource scarcity and increasing environmental pressure. The recycling of nitrogen and phosphorus from wastewaters is seen as a necessary element of sustainable resource management. The aim of this PhD thesis was to investigate and connect different aspects related to biological nutrient recycling: nutrient quantification, recovery and valorization. A detailed quantification of nutrient flows, emissions and waste streams in Flanders is provided which functions as a decision support tool for improved nutrient management. Afterwards a strategy for the biological stabilization and upgrading of concentrated nutrient streams was developed. Additionally, two novel microbial processes for nutrient upgrading were explored, based on nitrate-accumulation. To conclude, the valorization of recycled nutrients as a high-value microalgae fertilizer was investigated. This interdisciplinary approach provides strategies to facilitate the transition towards circular nutrient management.
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