Chapter 3 Decision Support Model (IUWS-DSM) - Tubdok

78 New Conception and Decision Support Model for IUWS
a typical waterworks and a typical WWTP. It shows clearly that more than half of energy is
consumed by finished water pumping and activated sludge aeration, respectively. Each of
other parts has small portion. Meanwhile, the different treatment trains for the same
treatment purposes may have different energy consumption. In the conveying system, pump
stations consume the most energy.
In the IUWS-DSM, the proposed procedure to assess the energy consumption for urban
water infrastructure is depicted in Figure 33. In the same way, treatment facilities involve two
types of facilities, i.e. package plant and on-site constructed. As discussed above, the
information of package plants are obtained from the manufacturers. Regarding on-site
constructed plants, there are five parts of energy consumption. First part is the intake
facilities. Second part is the treatment steps, which are corresponding to the classification of
urban water treatment processes in Figure 9. If the energy information of each treatment
train or treatment technique is available, the energy assessment can be also performed in
more detailed way.
.
Assessment Methods of Energy Consumption for Urban Water Infrastructure
Intake &
Treatment
Urban Water Infrastructure Energy Consumption
Assessment
Conveying
Systems
package
plant
on-site
construction
intake
facilities
treatment
STEPS
ancillary
equipments
sludge
treatment
auxiliary
buildings
pump
stations
treatment as
Trains / Tech.
method 1:
from statistic data
Case 1
energy information
from manufacturers
Case 2
method 2:
from actual calculation
method 3:
from similar projects
Abbreviation:
tech. – technique
Legend:
possible alternative
Outcome
as:
kWh/m 3
as:
kWh/capita
as:
kwh/day
Figure 33: Assessment methods of energy consumption for urban water infrastructure
The ancillary equipments form the third part, which are indispensable components for any
kind of treatment plant. Certainly, the energy consumption between different types of
equipments is different too. Nonetheless, the detailed comparison for ancillary equipments is
unnecessary in the early project phase. Hence, in generally this part energy consumption
keeps the same between waterworks or between WWTPs.