Water and Energy - Draft Report of the GWRC Research ... - IWA

2.1 Review of current knowledge and activities.
Part of the workshop was dedicated to the exchange and review of the current knowledge.
GWRC organisations have provided information regarding their finished and ongoing activities
in advance of the workshop. The information is included as annex G of the report.
They also provided - where available - data regarding the energy use in their countries for the
different parts of the urban water cycle: water treatment and supply and wastewater collection
and treatment.
Table 1. Energy Data as provided by the GWRC members and partner (kWh/m3)
USA NL SIN SUEZ GER UK ZA AUS
Water
Total Energy 0,43 0,47 0,45 0,57 1,01 0,1 - 0,5
Treatment 0,05 0,47 0,10 0,1- 0,3
Supply 0,40 0,10 0,91
Wastewater
Total Energy 0,56 0,52 0,67 0,4 - 0,9
Treatment 0,45 0,36 0,42 0,43 0,64 0,39
Collection 0,15 0,09 0,1 - 0,6
It is interesting to noticed (see table 1) that the average energy data for the different countries is
in a comparable range, despite the fact that the data relates to the various treatment options used
in each country. All provided data is included as annex F of the report.
The workshop included three key-note presentations regarding the Role of Energy in the Urban
Water Cycle, Climate Change and Energy Connection, Energy and Resource Recovery.
Together with the presentations by the GWRC organisations regarding their finished, ongoing
and planned research activities and provided background material, they formed the building
blocks to sketch the ‘map of knowledge’ (what do we know – what not) and the discussion on
research needs and possible joint research projects.
The presentations addressed a large variety of topics related to the energy aspects of the urban
water cycle as illustrated in figure 2. The list of presentations made by the participants at the
workshop is included as annex D.
GWRC Water & Energy - Draft report
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