Anaerobic digestion of poultry manure: Process optimization employing struvite precipitation and novel digestion technologies

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• 作者：Cameron Farrow ; Anna Crolla ; Chris Kinsley and Ed McBean
• 刊名：Environmental Progress & Sustainable Energy
• 出版年：2017
• 出版时间：January, 2017
• 年：2017
• 卷：36
• 期：1
• 页码：73-82
• 全文大小：521K
• ISSN：1944-7450

文摘

Solid-state anaerobic digestion (SSAD) of poultry manure is assessed utilizing a combination anaerobic leaching bed (ALBR)/plug-flow digester. Struvite precipitation is employed concurrently with digestion to control total ammoniacal nitrogen (TAN) and prevent inhibition of methanogenic archaea. Struvite precipitation reactions are performed at a pH of 7.0 to minimize microbiological stress when leachate is returned to the digester. Results demonstrate an increase in biogas yield of 30% (470 - 607 L/kgVS_in) during batch digestion trials and up to 235% during semi-continuous trials, when employing struvite precipitation methodologies. Methane content of the biogas is also shown to increase significantly (P < 0.05) when employing struvite precipitation. Of the three organic loading rates assessed (1.5, 3.0, 4.5 kg VS/m³•day) during semi-continuous digestion, 1.5 kg VS/m³•day is shown to be the most efficient, with respect to biogas yield.