Alexander Szabo and Oscar Engle - Svenskt Vatten

3. Water intensive faculties at UTM, such as the Environmental Engineering Laboratory and
Marine Engineering Laboratory, consume large quantities of water.
When estimating the water consumption behavior of UTM the value from Katimon and Demun
(2004) of 260 litres/(person*day) is initially used. The water consumption and waste water
production is normally of equal amount if no irrigation occurs. At UTM it was observed that
washing machines, cooking facilities and students’ laundry in some cases were not connected to
the sewer network so the final waste water production behavior of UTM will be lower than 260
litres/(person*day).
Waste water production in the catchment area
The pond receives waste water from around 10 500 persons according to the survey (see
Appendix B). No factories or other similar activities are present within the catchment. Hence, the
waste water is pure domestic.
If the value of 260 litres/(person*day) from Katimon and Demun (2004) is used the waste water
flow into the pond can be calculated:
=10 500 . . 260 /( ∗ )= 2730 t home at campus. The sampling period
started at 17:30 on the 5 th of November but unfortunately there were no flow measurements made
from the first three sample occasions that day due to technical problems. The first flow
measurement started at 23:00 which can be seen in Figure 8.7. The flow decreased at night and
increased slightly in the morning. From 13:00 to 16:00 a rainstorm started which can be seen in
Figure 8.7 in the precipitation data from UTM’s own rain gauge. In connection to the rainstorm
there was a significant increase of the flow.
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