A new study highlights that while methane digesters on dairy farms are largely effective, rare but massive leaks can erase much of their climate benefit, raising concerns about long-term sustainability. The research, led by scientists at the University of California, Riverside, analyzed 98 dairies across California over eight years using satellite and airborne data, tracking emissions before and after digester installation.
The findings show that digesters generally work as intended—reducing methane plumes and cutting emissions significantly, with earlier studies indicating reductions of up to 80% at well-managed sites. However, methane remains a critical concern as it is around 80 times more potent than carbon dioxide in the short term, meaning even brief leaks can have an outsized climate impact.
Crucially, the study found that when digesters fail or malfunction, methane releases can spike to about 1,000 kg per hour, compared to typical emissions of 20–100 kg per hour from open manure lagoons. These extreme but infrequent events can offset a significant share of emissions savings, especially since digesters concentrate methane in one place, making failures more impactful.
Researchers also flagged additional emission spikes during construction, maintenance, and venting operations, areas often overlooked in earlier assessments. Despite these risks, experts emphasize that digesters remain a powerful climate mitigation tool, provided there is rigorous monitoring, maintenance, and rapid leak detection to ensure consistent performance.
Source: Dairynew7x7 3 April, 2026 Read full story here
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