Alexander Szabo and Oscar Engle - Svenskt Vatten

Table 8.11: Measured BOD 5 on 5-6 Nov 2009 and estimated BOD 5 on 18-19 Nov 2009 and 9-10 Jan
2010.
* Partly based on designed flow
** Based on estimated BOD 5 -ratio
Maximum (mg/l) Minimum (mg/l) Weighted
average
(mg/l)
5-6 Nov
18-19 Nov
9-10 Jan
Average
89
191**
195**
26
6**
12**
59*
56**
57**
57
Total load per
day
(kg)
371*
421**
314**
369
Degradation rate of BOD
K-value used in this report indicates the speed of the BOD degradation. The k-value, in this report
used for degradation of BOD, is calculated by the increase of oxygen consumption over time.
Results of the k-value are listed in Table 8.12 below. The k-value data can be found in Appendix
F. For more information about the k-value see Appendix E.
Table 8.12: k 20 -values calculated with Thomas method (Thomas, 1950);
Influent waste water from 5-6 November 2009.
Time: k-value (d -1 )
17:00
19:00
22:00
23:00
01:00
03:00
05:00
07:00
09:00
11:00
13:00
14:15
Average
k-value
(d -1 )
0.235
0.144
0.254
0.282
0.256
0.294
0.179
0.289
0.274
0.190
0.255
0.222
0.24
53