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Anaerobic digestion of poultry manure: Process optimization employing struvite precipitation and novel digestion technologies
Author(s) -
Farrow Cameron,
Crolla Anna,
Kinsley Chris,
McBean Ed
Publication year - 2017
Publication title -
environmental progress and sustainable energy
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.495
H-Index - 66
eISSN - 1944-7450
pISSN - 1944-7442
DOI - 10.1002/ep.12442
Subject(s) - struvite , anaerobic digestion , biogas , leachate , manure , digestion (alchemy) , pulp and paper industry , chemistry , leaching (pedology) , precipitation , waste management , methane , environmental science , ammonia , agronomy , environmental chemistry , environmental engineering , chromatography , biology , biochemistry , wastewater , soil water , engineering , soil science , physics , organic chemistry , meteorology
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/m 3 •day) during semi‐continuous digestion, 1.5 kg VS/m 3 •day is shown to be the most efficient, with respect to biogas yield. © 2016 American Institute of Chemical Engineers Environ Prog, 36: 73–82, 2017