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Details of talk

TitleAnalysis of the activated sludge model (number 1)
PresenterMark Nelson (University of Wollongong)
Author(s)Dr Mark Nelson
SessionApplied Mathematics/Industrial Mathematics
Time17:00:00 2016-12-06

  The activated sludge process is widely used in wastewater treatment plants
to reduce effluent levels in contaminated wastewaters originating from both
the municipal and industrial sectors.

   An internationally accepted standard model for The biochemical processes
occurring within the reactor is the activated sludge model number 1 (ASM1).
It describes nitrogen and chemical oxygen demand within
suspended-growth treatment processes, including mechanisms for
nitrification and denitrification. The model has been found to give a
good description of the activated sludge process provided that the
wastewater has been characterised in detail and is of domestic or
municipal in origin.

  We analyse the biological treatment of a wastewater when a cascade of
two reactors is used. We compare the performance of a reactor configuration
using two aerobic reactors, such as used in a conventional activated sludge
process, against a reactor configuration in which an anoxic reactor
is placed upstream of an aerobic reactor, as is the case for the modified
Ludzack-Ettinger process.

  A combination of direct numerical integration with continuation
methods is used to investigate the steady-state
behaviour of the system. In particular, we determine bifurcation values
of the residence time, corresponding to branch points, that are crucial in
determining the performance of the system and investigate how the
use of recycle effects the removal of nitrates in the anoxic zone.