Environmental Engineering Reference
In-Depth Information
Increased OC concentrations at this location show increased CEC as well. The
significant difference between TP and Pav show that only a small portion of the
accumulated phosphorous will be reduced by plant uptake, the rest would accumulate in
the future until the soil sorption capacity is exhausted. Thus phosphorous accumulation in
the soil could be considered as a time bomb, because after the retention capacity of the
soil is fully exhausted, it would be leached to the ground water.
Table 9.2. Soils characteristics-general parameters
and nutrients.
Well
Depth (m)
Parameter
pH
CEC me% TP mg/kg Pav. mg/kg Org.C mg/kg TN mg/kg
BH1
0-0.3
0.3-0.6
0.6-1.2
6.3
7.2
6.9
30.9
28.9
34.2
99
338
347
7
14
5
197
161
26
19
14
3
BH2
0-0.3
0.3-0.6
0.6-1.2
6.2
6.4
5.6
22.8
14.7
23.3
529
198
115
21
4
3
160
75
61
11
7
4
BH3
0-0.3
0.3-0.6
0.6-1.2
4.6
5.5
6.1
7.0
17.3
11.8
793
330
149
64
31
8
90
66
43
9
5
4
BH4
0-0.3
0.3-0.6
0.6-1.2
4.4
5.0
4.7
25.4
20.2
22.8
793
463
628
57
53
55
1400
51
726
42
7
24
BH5
0-0.3
0.3-0.6
0.6-1.2
4.6
5.6
5.5
40.1
7.7
14.0
1718
793
99
156
58
3
2290
70
51
91
7
5
BH6
Control
0-0.3
0.3-0.6
0.6-1.2
5.5
7.2
6.6
10.9
37.2
35.3
446
66
99
30
4
5
60
46
17
6
4
2
Limit USA
a
No limit -
-
-
-
-
Limit EC
b
>6
-
-
-
-
-
BH1 has up to three times higher concentrations of OC at a depth of 0.6 m below the
surface. This could be due to the fact that being at the lowest point, it receives the
seepage from the farm, which affects the soil characteristics and forms marshy
conditions, thus leading to the transportation of accumulated pollutants to the lower parts
of the depth profile (0.6 m - 1.2 m). The soil characteristics (TP, TN and OC) along the
first two depth profiles are higher compared to the control point and only at the lowest
soil profile (0.6 m-1.2 m) the characteristics are comparable with the control point with
respect to the measured parameters, except for TP.
BH2 presents the soil characteristics at CWTW, which could be affected by the
infiltration of wastewater from the ponds. In general, no impact was found, except for
