TANDRAGEE – BUILDING ON TOP OF AN EXISTING WORKS
Hadi Tai1 and Derek Eccles2
1 Earth Tech, UK
2 Northern Ireland Water, UK
(free)
The Tandragee works has been upgraded to treat Population Equivalent of 19300 with
significant improvements in final effluent quality. With a limited space available on site, an
innovative solution was required to provide temporary treatment while concurrently
demolishing the old works and constructing the new works.
The original works commissioned in 1980 using primary settlement and biological filters was
replaced by a temporary plant based on a modified Sequencing Batch Reactor (SBR). The
temporary works was operated for 18 months whilst the new works was successfully
constructed and commissioned. Most of the temporary process equipment was re-used with
the SBRs converted to sludge holding tanks. The aeration system was maintained for mixing
and the tanks covered to allow air extraction for odour control.
Process evaluation identified a number of options; however the footprint constraints on site
meant that a Membrane Biological Reactor (MBR) provided the most suitable solution. The
new works consists of preliminary treatment, primary settlement followed by MBR.
The paper gives details of the associated issues with construction on a restricted site and
shows how the solution of a temporary SBR process was used successfully to allow treatment
to take place whilst the main works was being constructed.
KEY WORDS
Odour nuisance, Process Selection, SBR, Small Footprint, Temporary Treatment
