This engineering study tested whether adding trace elements to synthetic food waste improves methane production in laboratory anaerobic digesters. Selenate gave a 30 to 35% increase in biomethane at low microgram-per-liter doses for both feedstocks, while iron and other elements helped only the low-background feedstock. The work concerns waste treatment, not food safety.
Key numbers
- Selenate at 25 to 50 µg/L (0.32 to 0.63 µM) increased biomethane production by 30 to 35% (Abstract).
- Feedstock selenium: 1.3 (0.5) µg/g total solids in the Tampa preparation; below detection in the Delft preparation (Abstract).
- This paper reports no numerical findings relevant to selenium dietary exposure.
Methods (brief)
Closed-vessel biomethane potential tests with single trace elements and cocktails, volatile fatty acid analysis and sulfide inhibition experiments.
Evidence fitness
Off-topic for dietary exposure. The paper does not support dietary exposure or toxicity claims; it shows selenium acting as a trace nutrient for anaerobic microbial communities in a bioreactor, which is not evidence about the human gut.
Limitations
Synthetic waste; small laboratory scale; mechanism of enhancement not resolved.
Related evidence
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