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Although developments in wastewater treatment over recent decades
have focused on the biological reactor, the secondary settling tank
(SST) also plays a major role in achieving increasingly stringent
effluent quality standards. This report collates many of the
significant developments that have taken place in SST theory,
design, modelling and operation. Earlier SSTs were designed only by
empirical hydraulic criteria such as overflow rate, which do not
recognize sludge concentration and settleability. Today, there are
available not only much improved design procedures but also
hydrodynamic models for simulating water and solids distribution
and flows in full-scale SSTs. Nine chapters cover a wide range of
subjects including: Flocculation and settling behaviour of
biological sludges SST performance evaluation protocols Development
and evaluation of the different design procedures such as the flux
theory and the ATV design rules Developments in and application of
one- two- and three-dimensional modelling Experience-based aspects
of design and operation of circular, rectangular and vertical SSTs.
Reprinted for 2006 Scientific and Technical Report No.6
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