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Evaluation of Integrated Anaerobic Digestion and Hydrothermal Carbonization for Bioenergy Production

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Fermentative hydrogen gas production using biosolids pellets as the inoculum source.

Youssouf Kalogo¹, David M Bagley

¹Hydromantis Inc., 1 James Street South, Suite 1601, Hamilton, Ont., Canada L8P 4A5.

Bioresource Technology

|March 6, 2007

Summary

Biosolids pellets are a practical inoculum for fermentative hydrogen production, showing comparable hydrogen recovery to boiled sludge. Their effectiveness depends on the specific wastewater treated.

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Area of Science:

Environmental Microbiology
Biotechnology
Sustainable Energy

Background:

Wastewater sludge treatment generates biosolids, a potential resource.
Fermentative hydrogen production is a key area in renewable energy research.
Efficient inoculum sources are crucial for optimizing hydrogen production processes.

Purpose of the Study:

To evaluate the suitability of biosolids pellets as an inoculum for fermentative hydrogen production.
To compare the hydrogen recovery efficiency of biosolids pellets with conventional inoculum sources.
To assess the impact of different wastewater substrates on hydrogen production using biosolids pellets.

Main Methods:

Biosolids pellets were produced from anaerobically digested municipal wastewater sludge by drying.
Hydrogen production was assessed in glucose-fed batch systems using biosolids pellets as inoculum.
Hydrogen recovery was quantified by measuring gaseous H(2) produced relative to the added substrate's Chemical Oxygen Demand (COD).
Comparisons were made with boiled anaerobic digester sludge, primary sludge, and municipal wastewater as substrates.

Main Results:

Biosolids pellets achieved hydrogen recoveries of 20.2-21.5% with glucose, comparable to boiled anaerobic digester sludge.
Hydrogen recoveries from primary sludge were 2.4% (biosolids pellets) and 3.5% (boiled sludge).
Minimal hydrogen recovery (0.2-0.8%) was observed when using municipal wastewater directly.

Conclusions:

Biosolids pellets represent a practical and effective inoculum source for fermentative hydrogen production reactors.
The efficiency of biosolids pellets as an inoculum is substrate-dependent, particularly influenced by the characteristics of the wastewater treated.
Further research can optimize the use of biosolids in biohydrogen production systems.