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Related Experiment Video

Updated: Apr 16, 2026

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High rate manure supernatant digestion.

Wenche Hennie Bergland1, Carlos Dinamarca1, Mehrdad Toradzadegan1

  • 1Telemark University College, Kjølnes Ring 56, 3918 Porsgrunn, Norway.

Water Research
|March 18, 2015
PubMed
Summary

High rate anaerobic digestion efficiently recovers sustainable energy from pig manure. Compact sludge bed reactors demonstrate robustness, achieving high biogas production even with rapid load increases.

Keywords:
AD stabilityEnergy from slurriesHigh organic loadMicrobial communitiesPig manure supernatant

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Area of Science:

  • Environmental Science
  • Biotechnology
  • Sustainable Energy

Background:

  • Anaerobic digestion (AD) is a key technology for waste management and energy recovery.
  • Pig manure slurries present a significant, yet challenging, substrate for AD due to their composition and variability.
  • Optimizing AD processes for high-rate energy recovery from manure is crucial for sustainable agriculture and energy production.

Purpose of the Study:

  • To investigate the efficiency and robustness of high-rate anaerobic digestion of pig manure supernatant.
  • To determine the optimal operating conditions, specifically hydraulic retention times (HRT), for maximizing biogas production and energy recovery.
  • To assess the stability and microbial community adaptation within sludge bed AD reactors treating pig manure.

Main Methods:

  • Utilized 370 mL sludge bed anaerobic digestion (AD) reactors fed with pig manure supernatant.
  • Gradually decreased hydraulic retention times (HRT) from 42 to 1.7 hours, imposing organic loads up to 400 g COD L(-1) reactor d(-1).
  • Employed Denaturing Gradient Gel Electrophoresis (DGGE) for microbial community analysis and monitored key parameters like pH, alkalinity, and methane yield.

Main Results:

  • Reactors achieved high biogas production rates (up to 97 g COD L(-1) reactor d(-1)) and demonstrated robustness to daily load increases.
  • Stable pH (8.0 ± 0.1) and alkalinity were maintained across tested HRTs.
  • Methane yield decreased from ~0.47 g COD methane g(-1) CODT feed at HRT > 17 h to 0.24 at the lowest HRT, with propionate removal ceasing below 4 h HRT.

Conclusions:

  • High-rate anaerobic digestion in compact sludge bed reactors is an efficient method for sustainable energy recovery from pig manure supernatant.
  • The process exhibits significant robustness and stability, even under high organic loading rates.
  • Non-adapted granular sludge can be effectively used to inoculate these bioreactors, indicating rapid microbial adaptation.