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Full-scale in-line hydrolysis and simulation for potential energy and resource savings in activated sludge – a case study

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Author

Summary, in English

The potential effects of altering primary settlers during biological in-line hydrolysis and converting a nitrifying activated sludge process into a partial pre-denitrification process for the purpose of resource conservation were evaluated. A full-scale primary sludge hydrolysis experiment was performed at a wastewater treatment plant and implemented in a dynamic modelling tool based on ASM2d. The full-scale hydrolysis experiment achieved a volatile fatty acid (VFA) production of 43 g CODHAc·m−3 with no release of ammonium. Additional nitrogen removal of 44 t N·a−1 was simulated, and the produced hydrolysate was able to replace 50% of the annual ethanol usage. Furthermore, 196 MWh of electricity per annum could be saved through the reduction of ethanol production and the optimization of the operation strategy of the activated sludge tank by operating a different number of anoxic zones.

Publishing year

2012

Language

English

Pages

1819-1825

Publication/Series

Environmental Technology

Volume

33

Issue

15

Document type

Journal article

Publisher

Taylor & Francis

Topic

  • Chemical Engineering

Keywords

  • ASM2d
  • energy savings
  • full scale
  • hydrolysis
  • internal carbon source

Status

Published

ISBN/ISSN/Other

  • ISSN: 1479-487X