Tianjin University

Yuting Wang

Guanyi Chen

Beibei Yan

Ning Li

Zhanjun Cheng

Fawei Lin

Fan Yu

Junxia Wang

Jiangtao Wang

The present invention relates to the technical field of solid waste resource utilization and environmental engineering, and in particular to a method for recovering phosphorus based on cyclic hydrothermal carbonization of wetland plants, comprising the following steps: (1) washing, drying, then crushing and sieving harvested wetland plants; (2) taking biomass powder for hydrothermal carbonization treatment to obtain a hydrothermal carbonization product; (3) performing solid-liquid separation for the obtained carbonization product; (4) continuing to use the obtained carbonization liquid as a liquid-phase medium and mixing with the biomass raw material for multi-stage cyclic hydrothermal carbonization; after the cyclic carbonization is ended, conducting solid-liquid separation to obtain phosphorus-rich carbonization liquid and cyclic hydrochar; and (5) adjusting the pH of the phosphorus-rich carbonization liquid to form and recover phosphorus crystal precipitates. The present invention effectively recovers phosphorus from the wetland plants, simultaneously realizes the resource utilization of the hydrothermal carbonization product of the wetland plants, reduces the impact of hydrothermal carbonization of biomass waste on environment, and effectively solves the problems of treatment and disposal of wetland plant residues.

Method for recovering phosphorus based on cyclic hydrothermal carbonization of wetland plants

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Tianjin, China

Yuting Wang