Evaluation of operational parameters for semi-continuous anaerobic digester treating pretreated waste activated sludge. Issue 20 (26th April 2016)

• Record Type: Journal Article
• Authors: Gopikumar, S.; Arulazhagan, P.; Kavitha, S.; Adish Kumar, S.; Rajesh Banu, J.
• Is Part Of: Desalination and water treatment. Volume 57:Issue 20(2016)
• Page Start: 9093
• Page End: 9100
• Publication Date: 2016-04-26
• Subjects: Waste activated sludge (WAS) -- Citric acid -- Pretreatment -- Solids reduction -- Biogas; Saline water conversion -- Periodicals; Saline water conversion; Water -- Purification; Periodicals; 628.167
• DOI: 10.1080/19443994.2015.1029526
• Languages: English
• ISSNs: 1944-3994

Abstract

Abstract: 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.