|
U1
|
SSB effluent 1
|
D1
|
U2
|
SSB effluent 2
|
D2
|
---|
Conductivity (µs/cm)
|
451
|
720
|
540
|
475
|
765
|
509
|
Water temperature (°C)
|
13.9**
|
12.1
|
13.6**
|
18.7*
|
13.6
|
18.2*
|
O2 saturation (%)
|
113.5
|
111
|
120
|
116
|
118.2
|
111.7
|
O2 content (mg/L)
|
10.92**
|
11
|
11.6**
|
9.94**
|
11.31
|
9.83**
|
NH4–N (mg/L)
|
0.06*
|
–
|
<0.04**
|
<0.04**
|
<0.04
|
<0.04**
|
NO–N (mg/L)
|
0.012
|
–
|
0.01
|
0.007
|
0.01
|
0.006
|
NO–N (mg/)L
|
0.7
|
–
|
0.9
|
0.9
|
3.8
|
1.1
|
PO–P (mg/L)
|
<0.05*
|
–
|
<0.05*
|
<0.05*
|
<0.05
|
<0.05*
|
Carbonate hardness (°dH)
|
16
|
–
|
15
|
19
|
–
|
19
|
Overall hardness (°dH)
|
15
|
–
|
16
|
20
|
–
|
20
|
pH
|
8.5*
|
–
|
8.5*
|
8.2*
|
7.95
|
8.1*
|
Chloride (mg/L)
|
11**
|
–
|
19**
|
13**
|
70
|
17**
|
- Values were evaluated and assessed according to the guidance values defined by LAWA (German Working Group for Water Issues; LUBW [18]) and the German Regulation Act for Surface Waters of 2011 (OGewV [16])
- Values marked with two asterisks (**) point to very good ecological conditions; values marked with one asterisk (*) point to ecological conditions that are at least good