Environmental Science and Pollution Research

, Volume 24, Issue 1, pp 813–826 | Cite as

Upgrading the hydrolytic potential of immobilized bacterial pretreatment to boost biogas production

  • U. Ushani
  • S. Kavitha
  • M. Johnson
  • Ick Tae Yeom
  • J. Rajesh Banu
Research Article

Abstract

In this study, surfactant dioctyl sodium sulphosuccinate (DOSS)-mediated immobilized bacterial pretreatment of waste activated sludge (WAS) was experimentally proved to be an efficient and economically feasible process for enhancing the biodegradability of WAS. The maximal floc disruption with negligible cell cleavage was achieved at surfactant dosage of 0.009 g/g SS. Results of the outcome of bacterial pretreatment of sludge biomass revealed that chemical oxygen demand (COD) solubilization for deflocculated (EPS removed—bacterially pretreated) sludge was 20 %, which was higher than that of flocculated (14 %) or control (5 %). The pretreatment was swift in deflocculated sludge with a rate constant of about 0.064 h−1. Biochemical methane potential (BMP) assay resulted in significant methane yield at 0.24 gCOD/gCOD for deflocculated sludge. Economic assessment of the proposed method showed a net profit of about 57.39 USD/ton of sludge.

Keywords

Waste activated sludge Dioctyl sodium sulphosuccinate Immobilization Protease enzyme Methane 

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Copyright information

© Springer-Verlag Berlin Heidelberg 2016

Authors and Affiliations

  • U. Ushani
    • 1
  • S. Kavitha
    • 1
  • M. Johnson
    • 2
  • Ick Tae Yeom
    • 3
  • J. Rajesh Banu
    • 1
  1. 1.Department of Civil EngineeringRegional Centre of Anna UniversityTirunelveliIndia
  2. 2.St. Xavier CollegeTirunelveliIndia
  3. 3.Department of Civil and Environment EngineeringSungkyunkwan UniversitySeoulSouth Korea

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