Investigates mechanical stirring's impact on biogas production in anaerobic biodigesters treating swine wastewater, indicating promising outcomes for efficiency.
This study investigated the effect of localized mechanical stirring on the performance and organic matter conversion pathways in two bench-scale horizontal flow anaerobic biodigesters treating swine wastewater (SW). Two reactors (total volume of 10.6L; working volume of 7.95 L) were operated in parallel for 150 days under identical conditions (hydraulic retention time [HRT] = 25 days; volumetric organic loading rate [VOLR] = 0.3-0.5 g V L⁻¹ day⁻¹ of TVS): one equipped with mechanical mixing (HFw) and the other operated without mixing (HFw/o). After system stabilization, no statistically significant differences were observed between the reactors with respect to hydrolysis and methanogenesis (%) or biogas production and composition. Mass balance analysis demonstrated that HFw accumulated fewer solids within the reactor (5.5% of the applied chemical oxygen demand [COD]) compared with HFw/o (13.6%). These findings indicate that mechanical stirring effectively mitigates sludge accumulation without compromising overall treatment performance or biogas generation.
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Cruz et al. (2026) studied this question.
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