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Updated: May 25, 2026
06:11
Measuring Biomethane Potential of Food Scrap Waste Anaerobically Co-Digested with Waste-Activated Sludge Using Respirometry
Published on: April 26, 2024
Optimization of municipal sludge and grease co-digestion using disintegration technologies
1Water Technology Centre, Av. Diagonal, Barcelona, Spain. lbouchy@cetaqua.com
Summary
Grease waste (GW) co-digestion with municipal sludge enhances biogas production. Pre-treatment technologies, especially thermal hydrolysis, significantly boost methane yield from wastewater sludge, improving energy recovery.
Area of Science:
- Environmental Engineering
- Biotechnology
- Renewable Energy
Background:
- Wastewater treatment plants (WWTPs) are increasingly explored for renewable energy production, primarily through biogas generation from sewage sludge.
- Energy recovery from sludge is a key driver for developing sustainable WWTP operations.
- Grease waste (GW) presents a potential high-methane-yield substrate for co-digestion.
Purpose of the Study:
- To assess grease waste (GW) as a co-digestion substrate with municipal sludge for enhanced biogas production.
- To evaluate the efficacy of disintegration technologies (thermal hydrolysis, ultrasound, enzymatic treatment) in optimizing the co-digestion process.
- To determine the impact of GW addition and pre-treatment on methane yield and volumetric methane productivity.
Main Methods:
- Co-digestion experiments were conducted using municipal sludge and varying percentages of GW.
- Three pre-treatment methods were applied to GW and sludge: thermal hydrolysis, ultrasound, and enzymatic treatment.
- Methane yield, volumetric methane productivity, organic matter solubilization, and digestate hydrodynamic characteristics were analyzed.
Main Results:
- Co-digestion with 23% GW significantly increased volumetric methane productivity by up to 128% compared to sludge alone.
- All tested pre-treatments improved methane yield: thermal hydrolysis (+51.8%), ultrasound (+89.5%), and enzymatic treatment (+57.6%).
- Thermal hydrolysis of GW and secondary sludge demonstrated the most effective solubilization of organic matter and improved digestate properties.
Conclusions:
- Grease waste is a viable substrate for co-digestion with municipal sludge, enhancing biogas energy recovery in WWTPs.
- Pre-treatment technologies, particularly thermal hydrolysis, are crucial for maximizing methane yield and process efficiency.
- Optimized co-digestion strategies involving GW and pre-treatment offer significant potential for sustainable energy generation from wastewater.
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