Hydrothermal Process for Extracting Phosphate from Animal Manure

  • Huanhuan Li
  • Xueli Zhao
  • Tao ZhangEmail author
  • Andrea Kruse


To mitigate the risk of the secured supply of phosphate rock, increasing attention has been paid to phosphorus (P) recovery from untapped secondary resources. Animal manure is one of the most important secondary resources for P in light of the large quantity and high P content. This chapter describes the hydrothermal technology to efficiently extract P from animal manure. Laboratory experiments showed that the hydrothermal treatment of pig manure at 180 °C under the oxygen partial pressure of 1 MPa could increase the P extractability by approximately 150% compared to the untreated control. Under this condition, the concentration of P in the eluate reached up to 114 mg/L. The kinetics of extracting P from pig manure by the hydrothermal technology could be given by the first-order reaction equation.


Hydrothermal treatment Animal manure P extraction kinetics 



The work was supported by a grant from the National Key Technology Research and Development Program of China (No. 2016YFD0501404-6, 2017YFD0800202), the National Natural Science Foundation of China (No. 31401944), the China Agricultural University Education Foundation “Da Bei Nong Group Education Foundation” (No. 1031-2415005), and the Beijing Municipal Natural Science Foundation (No. 6144026).


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Copyright information

© Springer Nature Singapore Pte Ltd. 2019

Authors and Affiliations

  • Huanhuan Li
    • 1
  • Xueli Zhao
    • 2
  • Tao Zhang
    • 1
    Email author
  • Andrea Kruse
    • 2
  1. 1.Beijing Key Laboratory of Farmland Soil Pollution Prevention and Remediation, Key Laboratory of Plant-Soil Interactions of Ministry of Education, College of Resources and Environmental SciencesChina Agricultural UniversityBeijingChina
  2. 2.Institute for Agricultural EngineeringUniversity of HohenheimStuttgartGermany

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