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Updated: Mar 24, 2026

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Disintegration impact on sludge digestion process.

Regimantas Dauknys1, Mindaugas Rimeika1, Eglė Jankeliūnaitė1

  • 1a Department of Water Management , Vilnius Gediminas Technical University , Vilnius , Lithuania.

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Summary

Thermal hydrolysis enhances anaerobic sludge digestion, increasing volatile suspended solids (VSS) destruction by 14% on average. This process allows for higher VSS loading, potentially reducing digester volume by 1.8 times.

Keywords:
Anaerobic digestionVSS destructionsludge disintegrationthermal hydrolysis

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Area of Science:

  • Environmental Engineering
  • Biotechnology
  • Wastewater Treatment

Background:

  • Anaerobic sludge digestion is crucial for sludge stabilization in wastewater treatment.
  • Sludge disintegration methods can improve anaerobic digestion efficiency.
  • The impact of thermal hydrolysis on full-scale anaerobic digestion requires further investigation.

Purpose of the Study:

  • To analyze the effect of thermal hydrolysis on anaerobic sludge digestion using full-scale data.
  • To determine the optimal VSS loading for maximum VSS reduction and biogas production with and without thermal hydrolysis.

Main Methods:

  • Analysis of full-scale data from wastewater treatment plants.
  • Comparison of volatile suspended solids (VSS) destruction with and without thermal hydrolysis.
  • Evaluation of VSS loading rates and digester volumes.

Main Results:

  • Maximum VSS destruction reached 65%, irrespective of thermal hydrolysis.
  • Average VSS destruction increased by 14% with thermal hydrolysis.
  • Thermal hydrolysis allows for a 2.5 times higher VSS loading, enabling smaller digester volumes (1.8 times smaller).

Conclusions:

  • Thermal hydrolysis significantly improves the efficiency of anaerobic sludge digestion.
  • Optimal VSS loading rates differ significantly with and without thermal hydrolysis.
  • Implementing thermal hydrolysis can lead to substantial reductions in required digester size.