Fig2.6
Fig2.7
Characterization of Wastewaters and Sludges
Oxygen consumption, rv.o 2
50
90/(m 3 · h)
,
:,.
Waste water
.:
:
in the influent
:
:
cPcP o o olb o o ~ ......... ' t. ~r
1
..0
L
V,02
I ~
D%o~ · . .
1 0
o
p
~
40
30
0
20
0
0 DoD
0
10
Time, hours
Analyses for the determination of easily degradable organic matter. Based on tJ.rv,o2
Ss can be calculated using Expression (2.5). From /13!
BOD 1 g/m'
600
400
200
5
80Doo=600g/m'
Influent
Byldenup-Bov Wastewater
Treatment Plant, Denmark
10
15
The BODt-curve for mixed municipal and slaughterhouse wastewaters.
- Suspended easily degradable organic matter is found as the difference
between the total COD and the other fractions, that is,
Xs = Ccoo- Xr- SHAc- Ss- Sr
The concentration of bacteria, X a, may be calculated on the basis of respiration tests /16/, where the respiration at 20°C per kg bacteria in the wastewater may, for example, be estimated at 200 g Oz/h. The fraction of denitrifying bacteria may be determined by a parallel respiration test with nitrate
as the electron acceptor (respiration approx. 70 g N03-N I (kg bacteria · h)).
The concentration of bacteria may also be estimated by counting or AlP-measurements, dehydrogenase measurements, etc.
45