Effects of Short Retention Times and Ultrasound Pretreatment on Ammonium Concentration and Organic Matter Transformation in Anaerobic Digesters Treating Sewage Sludge

• DOI: 10.3390/fermentation10010063
• Publication Date: 2024-01-17T12:41:28Z
• Authors: Matías Olivera; Felipe Barriga; Patricio Neumann; Gloria Gómez; Gladys Vidal
• Keywords: Sewage sludge; Mesophile; Biogas; Thermal hydrolysis

Anaerobic digestion of sewage sludge is limited at the hydrolysis stage process. The goal this study was to assess effects retention times and ultrasound pretreatment on ammonium concentration organic matter transformation in anaerobic digesters treating sludge. To achieve this, two laboratory-scale semicontinuous were operated for a period over 70 d, including control reactor another fed by pretreated Both systems with mixed (50%/50% primary/secondary treatment) mesophilic conditions (37 °C), solid (SRT) 7.5 d (Phase I) 3 II). performance process assessed terms methane yield total soluble chemical demand, solids, volatile solids removal. results showed that caused an increase around 22.2% CODt removal SRT d. Meanwhile, resulted decrease up 92.4% biogas production significantly affected reduction showing not viable these conditions.