Feeding controls H₂S production in situ in high solid anaerobic digestion

Abstract

In this study, a high frequency monitoring method was used to assess how semi-continuous feeding affects H₂S production in high solid anaerobic digestion. The results showed that H₂S characteristics at a monitoring frequency of 1 point/3 h were different to that of 1 point/24 h, its concentration decreased from 3449 ± 227 mg/m³ at 0 h to 298 ± 45 mg/m³ at 3 h. H₂S concentration was negatively correlated with volatile fatty acids (VFAs), and oxidation reduction potential (ORP). 72–82% of H₂S reduction in the first 3 h resulted from the introduction of O₂ during feeding, and 18–28% of that was closely related to the production of a large quantity of soluble acidic matter, such as VFAs. A more accurate H₂S release model was established according to the content of VFAs. Totally, this study implies that feed carrying air is a promising method for in situ control of H₂S production in anaerobic digestion.

Keywords

High solid / Anaerobic digestion / Short time-scale / H₂S release / Volatile fatty acid

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Funding

Special Research Fund of Natural Science of Guizhou University(No.X2020085)

Action plan project for service enterprises of scientific research institutions in Guizhou Province(No.[2018 ]4007(006))

Basic Condition Platform Construction Project of Science and Technology Department of Guizhou Province(No.[2019] 5701)