Alexander Szabo and Oscar Engle - Svenskt Vatten

Figure 8.14: Above: TSS concentrations from all three measurements periods from influent waste
water to the WSP. Below: Rain data collected from UTMs weather station. It can be observed that
the TSS on the 5-6 November and 18-19 November are directly affected by the precipitation.
The TSS trend tends to be highly affected by rainfall (see Figure 8.13). The peak at 08:00 on the
9-10 Jan is not related to any rainfall and the cause is unknown. The same sample showed an
unusual high COD-value as well the TSS result is considered as valid.
Dimensioning values
TSS
For all 12 waste water samples collected on 5-6 November 2009, 18-19 November 2009 and 9-10
January the maximum and minimum TSS-value has been tabulated in Table 8.9 below. From the
flow data collected an average weighted TSS value and total load per day has been calculated.
Table 8.9: Measured TSS-values on 5-6 November 2009, 18-19 November 2009 and 9-10
January
2010.
* Partly based on designed flow
Maximum Minimum Weighted Total load per
5-6 Nov
18-19 Nov
9-10 Jan
Average value
(mg/l)
150
210
193
(mg/l)
11
1
2
average (mg/l)
63*
52
47
54
day (kg)
401*
389
261
350
COD
For all 12 waste water samples collected on 5-6 November 2009, 18-19 November 2009 and 9-10
January the maximum and minimum COD-value has been tabulated in Table 8.10 below. From
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