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Related Experiment Video

Updated: Oct 10, 2025

Transformation of Organic Household Leftovers into a Peat Substitute
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Effect of hydrothermal pretreatment on the degrease performance and liquid substances transformation of kitchen

Ting Xie1, Zhaohan Zhang2, Muchen Sun1

  • 1State Key Laboratory of Urban Water Resource and Environment, School of Environment, Harbin Institute of Technology, No 73 Huanghe Road, Nangang District, Harbin, 150090, China.

Environmental Research
|December 15, 2021
PubMed
Summary

Hydrothermal pretreatment significantly enhances kitchen waste (KW) oil recovery and desalination. Optimal conditions were identified for improved oil yield and resource utilization.

Keywords:
DeoilingHydrothermal pretreatmentKitchen wasteOrthogonal experimental designSubstances transformation

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Area of Science:

  • Waste Management
  • Biochemical Engineering
  • Environmental Science

Background:

  • Kitchen waste (KW) presents a significant disposal challenge.
  • Effective pretreatment methods are crucial for valorizing KW.
  • Hydrothermal treatment (HT) offers a promising approach for KW processing.

Purpose of the Study:

  • To investigate the impact of hydrothermal pretreatment (HTP) on KW deoiling and desalting.
  • To analyze the transformation of liquid substances during HTP of KW.
  • To optimize HTP parameters for enhanced kitchen waste utilization.

Main Methods:

  • Orthogonal experimental design was employed to study three factors: solid to liquid ratio, heating time, and hydrothermal temperature.
  • Analysis of floatable oil content, desalination ratio, volatile fatty acids (VFAs), total organic carbon (TOC), and key chemical species in the liquid phase.
  • Statistical analysis (range and variance) to determine the influence of each factor.

Main Results:

  • HTP significantly improved floatable oil content, reaching 84.54 mL/kg at 100°C for 20 min with a 1:1.5 solid to liquid ratio.
  • Maximum desalination ratio of 92.66% was achieved under specific conditions (1:2.5 ratio, 5 min, 100°C).
  • VFAs concentration increased by 711.03%, and TOC reached 53530.84 mg/kg, indicating enhanced liquid phase transformation.

Conclusions:

  • Hydrothermal pretreatment is effective for deoiling, desalting, and transforming kitchen waste.
  • Temperature was the most influential factor for deoiling and liquid substance transformation.
  • Optimal parameters for KW deoiling were identified as a 1:1.5 solid to liquid ratio, 25 min heating time, and 100°C.