Details

Autor(en) / Beteiligte

• Ganidi, Nafsika
• Tyrrel, Sean
• Cartmell, Elise

Titel

The effect of organic loading rate on foam initiation during mesophilic anaerobic digestion of municipal wastewater sludge

Ist Teil von

• Bioresource technology, 2011-06, Vol.102 (12), p.6637-6643

Ort / Verlag

Kidlington: Elsevier Ltd

Erscheinungsjahr

2011

Link zum Volltext

Quelle

MEDLINE

Beschreibungen/Notizen

• The impact of increasing organic load on anaerobic digestion foaming was studied at both full and bench scale. Organic loadings of 1.25, 2.5 and 5 kg VS m −3 were applied to bench-scale digesters. Foaming was monitored at a full scale digester operated in a comparable organic loading range over 15 months. The bench scale batch studies identified 2.5 kg VS m −3 as a critical threshold for foam initiation while 5 kg VS m −3 resulted in persistent foaming. Investigation of a full scale foaming event corroborated the laboratory observation that foaming may be initiated at a loading rate of ⩾2.5 kg VS m −3. Experimental findings on foam composition and differences in the quality characteristics between foaming and non-foaming sludges indicated that foam initiation derived from the combined effect of the liquid and gas phases inside a digester and that the solids/biomass ultimately stabilized foaming.