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Proper management of wet organic wastes (e.g., food waste) is receiving growing attention due to the increasing quantity of this waste stream. However, most of this waste is currently sent to the landfill, contributing to significant amounts of greenhouse gas (GHGs) emissions. Hydrothermal liquefaction (HTL) is an emerging technology to convert wet organic wastes into valuable products including drop-in transportation fuels, valuable materials, and nutrient products. This project will investigate multiple strategies to valorize the aqueous product from HTL, which is characterized by high organic and nutrients (nitrogen, phosphorus) loading. In particular, struvite, a mineral containing N, P, and Mg, is one of the fertilizers that can be generated from the aqueous product of HTL. As the aqueous product does not have sufficient Mg, additional Mg salts (e.g., MgCl2) are often used, which would lead to high production cost. To enhance the financial viability of this process, this project will explore the potential of using seawater brine – which contains a relatively high concentration of Mg – as a cheap Mg source for struvite production.
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