Exploring nanobubble technology for enhanced anaerobic digestion of thermal-hydrolysis pre-treated sewage sludge
Bioresource Technology Reports, ISSN: 2589-014X, Vol: 27, Page: 101939
2024
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Article Description
Nanobubble technology was used to enhance anaerobic digestion (AD) of thermal-hydrolysis pre-treated sewage sludge for bioenergy recovery. The prepared air, CO 2, and H 2 nanobubble solutions, with concentrations of 9.88–10.2 × 10 7 bubbles/mL, remained stable for at least 7 days. After adding them into AD reactors, significantly higher CH 4 production (37.1 %) was observed for the CO 2 nanobubble treatment, followed by air (25.6 %) and H 2 (14.5 %) nanobubble treatments, compared to the control group. CO 2 nanobubble treatment performed the best in improving acidogenesis/acetogenesis, resulting in significantly higher volatile fatty acid generation during the initial 3–4 days. A comparison of reactors supersaturated and non-saturated with oxygen has demonstrated most of the biogas uplift observed to result from the nanobubbles rather than from initial oxygen soluble levels, demonstrating the crucial role of nanobubbles in upgrading AD. This study demonstrates, for the first time, that nanobubbles can provide additional benefits when combined with stablished sludge pre-treatment technologies.
Bibliographic Details
Elsevier BV
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