Hydrothermal liquefaction (HTL) of phosphorus (P) rich wastes is a promising technology to recover P in solid form. For the applicability as fertilizer, the HTL solids should contain nutrients, in particular P, in plant available form and low concentrations of heavy metals. In the present study, the fate of P and other nutrients has been studied by performing HTL of four P-rich wastes. The effect of temperature on the distribution of the HTL products and nutrients has been investigated. It was found that up to 100% of the total P can be accumulated in the solid phase. However, the bioavailability of P decreased to 0.6–1% and the concentrations of heavy metals exceeded threshold values for fertilizers. Due to the limited P bioavailability and high contents of heavy metals, the reclamation of P as struvite is also calculated. Based on these estimations, between 42 and 93% of P can be recovered as struvite.

富磷 (P) 废物的水热液化 (HTL) 是一种很有前途的以固体形式回收 P 的技术。对于作为肥料的适用性，HTL 固体应含有植物可利用形式的养分，尤其是磷，以及低浓度的重金属。在本研究中，通过对四种富含 P 的废物进行 HTL 研究了 P 和其他营养素的归宿。已经研究了温度对 HTL 产物和营养物分布的影响。发现高达 100% 的总 P 可以在固相中积累。然而，磷的生物利用度下降到 0.6-1%，重金属浓度超过了肥料的阈值。由于磷的生物利用度有限且重金属含量高，还计算了磷作为鸟粪石的回收。