Evaluation of operational parameters for semi-continuous anaerobic digester treating pretreated waste activated sludge

Experimental analysis of citric acid and bacterial pretreatment on waste activated sludge (WAS) was performed in a semi-continuous anaerobic reactor for assessing the sludge reduction. The sludge pretreatment was carried out by deflocculating the WAS using 50 mM/L citric acid and subjecting to bacte...

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Published in:Desalination and water treatment 2016-04, Vol.57 (20), p.9093-9100
Main Authors: Gopikumar, S., Arulazhagan, P., Kavitha, S., Adish Kumar, S., Rajesh Banu, J.
Format: Article
Language:English
Subjects:
Activated sludge
Anaerobic digestion
Bacillus licheniformis
Bacteria
Biogas
Citric acid
Load distribution
Organic loading
Pretreatment
Reactors
Reduction
Retention time
Sludge
Sludge digestion
Solids reduction
Suspended solids
Volatile solids
Waste activated sludge (WAS)
Wastes
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Summary:Experimental analysis of citric acid and bacterial pretreatment on waste activated sludge (WAS) was performed in a semi-continuous anaerobic reactor for assessing the sludge reduction. The sludge pretreatment was carried out by deflocculating the WAS using 50 mM/L citric acid and subjecting to bacterial disintegration using 2 g dry cell weight/L of Bacillus licheniformis. The pretreatment resulted in a COD solubilization of about 40%. Anaerobic digestion (AD) of pretreated sludge was carried out in a 3.5 L semi-continuous anaerobic reactor. The AD results reveal that an organic loading rate (OLR) of 1 g/L d operated at 15 d hydraulic retention time was preferably the pertinent OLR for the efficient digestion. AD of pretreated sludge resulted in 43% of suspended solids reduction and 48% of volatile solids (VS) reduction, respectively, with biogas yield of 189.61 mL/g VS added.
ISSN:1944-3986
1944-3994
1944-3986
DOI:10.1080/19443994.2015.1029526