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Phosphorus recovery from hydrothermal carbonization of organic waste: a review

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journal contribution
posted on 2023-08-01, 08:05 authored by Nidal KhalafNidal Khalaf, JAMES J LEAHYJAMES J LEAHY, WITOLD KWAPINSKIWITOLD KWAPINSKI

Background: This review sheds light on the topic of phosphorus (P) recovery from hydrothermal carbonization (HTC) of organic waste.The paper focuses on the rising need for securing alternative P sources for the increasing demand, in addition to the development of HTC as a thermochemical technique for waste valorization. Results: This article studies the definition of P-recovery from HTC, while introducing the notion of availability, which is a significant factor for studying the efficiency of P-recovery. A brief comparison between different treatment techniques for P-recovery from waste streams is presented, and the advantages of HTC are highlighted among different thermochemical techniques. Furthermore, the mechanisms of P-transformation during HTC reactions are studied, and the effect of various parameters on P-destination and recovery is emphasized. Finally, applications of P-recovery from HTC products on the laboratory and industrial scales are studied to assess the feasibility of the application. Conclusion: In short, the paper offers a detailed insight into the definition, mechanism, and potential feasibility of P-recovery from HTC of organic wastes within the scopes of resource management, waste valorization, and fertilizer production. Even though HTC for P-recovery from organic waste has been applied on laboratory and industrial scales, several challenges persist towards optimizing this process. The paper concludes that adopting P-availability as a criterion for efficiency is necessary to optimize HTC conditions for P-recovery. Further studies on P-transformation during later-stage reactions of HTC are recommended, as well.



. Journal of Chemical Technology and Biotechnology


John Wiley & Sons Ltd.

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  • (6) Clean Water and Sanitation

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  • Chemical Sciences

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