Simulation of the Impact of SRT on Anaerobic Digestability of Ultrasonicated Hog Manure
Article, Other literature type
- Publisher: Molecular Diversity Preservation International
anaerobic digestion; SRT; ultrasound; hog manure; bound protein | hog manure | Technology | ultrasound | SRT | T | bound protein | anaerobic digestion
Ultrasonication at a specific energy of 500 kJ/kgTS was applied to hog manure in a continuous mode completely mixed anaerobic digestion. A process model in BioWin was developed, calibrated and tested at different solids retention times (SRTs) to evaluate the process economics. The results showed that there was a 36% increase in volatile suspended solids (VSS) removal efficiency, a 20% increase in methane production rate, a 13.5% increase in destruction of bound proteins, and a reduction from 988 to 566 ppm in H 2 S concentration in the digester headspace. Furthermore, a calibrated model of the process using BioWin to assess the impact of SRTs on the economics of anaerobic digestion for unsonicated and sonicated hog manure revealed that ultrasonication resulted in a net benefit of $42–46/ton dry solids at SRTs of 15–30 days.