| Literature DB >> 25127248 |
T Gayathri1, S Kavitha1, S Adish Kumar1, S Kaliappan2, Ick Tae Yeom3, J Rajesh Banu4.
Abstract
In this investigation, the application of citric acid was explored for the removal of extracellular polymeric substance (EPS) from waste activated sludge (WAS), followed by ultrasonic pretreatment, which enhanced the subsequent anaerobic biodegradability. EPS was removed with 0.05g/g SS of citric acid. The chemical oxygen demand (COD) solubilization and suspended solids (SS) reduction that occurred for specific energy input of 171.9kJ/kg TS, in deflocculated (EPS removed and ultrasonically pretreated) sludges were found to be 22.70% and 20.28% and was comparatively higher, than the flocculated (with EPS and ultrasonically pretreated). The biogas yield potential of flocculated and deflocculated sludges (specific energy input - 171.9kJ/kgTS) was found to be 0.212L/(gVS) and 0.435L/(gVS), respectively. Accordingly, the deflocculation and ultrasonic pretreatment improved the anaerobic biodegradability efficiently. Thus, this chemo mediated sonic pretreatment is an effective method for enhancing biodegradability and improving clean energy generation from WAS.Entities:
Keywords: Anaerobic biodegradability; Cell lysis; Enzyme activity; Extracellular polymeric substance; Solubilization; Waste activated sludge (WAS)
Mesh：
Substances：
Year: 2014 PMID： 25127248 DOI： 10.1016/j.ultsonch.2014.07.017
Source DB: PubMed Journal: Ultrason Sonochem ISSN： 1350-4177 Impact factor: 7.491