Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7076451 | Bioresource Technology | 2014 | 5 Pages |
Abstract
This study aims to evaluate the use of oxidation reduction potential (ORP) to regulate the injection of a small amount of oxygen into an anaerobic digester for reducing H2S concentration in biogas. The results confirm that micro-oxygen injection can be effective for controlling H2S formation during anaerobic digestion without disturbing the performance of the digester. Biogas production, composition, and the removal of volatile solids (VS) and chemical oxygen demand (COD) were monitored to assessment the digester's performance. Six days after the start of the micro-oxygen injection, the ORP values increased to between â320 and â270Â mV, from the natural baseline value of â485Â mV. Over the same period the H2S concentration in the biogas decreased from over 6000Â ppm to just 30Â ppm. No discernible changes in the VS and COD removal rates, pH and alkalinity of the digestate or in the biogas production or composition were observed.
Keywords
Related Topics
Physical Sciences and Engineering
Chemical Engineering
Process Chemistry and Technology
Authors
Long D. Nghiem, Patrick Manassa, Marcia Dawson, Shona K. Fitzgerald,