of background value monitoring wells and may be related to high background
values. The magnitude of excess reaches 32.5–130.00 times for nitrite, significantly
higher than that of Q2, so the operation of the landfill is considered the main cause.
In short, due to the operation of the landfill, sulfate, manganese, permanganate
index, nitrite and ammonia nitrogen in the groundwater exceed the limits by 1.06,
2.15–24.97, 1.15–2.06, 32.5–130.00, and 2.80–85.65 times respectively. This
affects groundwater from the landfill to the bank of the Jinma River.
(4) Groundwater pollution source intensity evaluation
The landfill is an existing source of groundwater pollution without seepage control.
According to the process shown in Fig. 3.3, the groundwater pollution source
intensity evaluation needs to consider the hazard of groundwater pollution sources
and the mitigation performance of the vadose zone. The vadose zone of the site is
mainly composed of artificially accumulated backfill, medium sand and pebbles,
Table 5.56 Water quality monitoring results for JK01–JK05 (Unit: mg/L)
Item
Detected values
Grade III
standards
JK01
JK02
JK03
JK04
JK05
pH (dimensionless)
7.4
6.9
7.7
7.5
7.4
6.5–8.5
Total hardness
335.3
405.4
205.2
332.8
360.3
450
Total soluble solids
450.7
734.6
357.3
483.1
518.3
1000
Sulfate
86.8
265.6
105.3
107.2
161.6
250
Chloride
17.02
54.95
16.31
20.92
10.64
250
Iron
ND
0.1
ND
ND
ND
0.3
Copper
0.215
2.497
1.99
0.038
ND
0.1
Zinc
ND
ND
ND
ND
ND
1.0
Volatile phenols
ND
ND
ND
ND
ND
1.0
Permanganate index
ND
ND
ND
ND
ND
0.002
Nitrate
1.2
6.19
3.44
2.04
1.38
3.0
Nitrite
28.01
10.5
9.59
29.92
30.52
20
Ammonia nitrogen
0.65
2.6
2.54
1.03
0.97
0.02
Fluoride
5.41
17.13
1.14
2.39
0.56
0.2
Cyanide
0.34
0.69
0.88
0.64
0.6
1.0
Mercury
ND
ND
ND
ND
ND
0.05
Arsenic
ND
ND
ND
ND
ND
0.001
Cadmium
ND
ND
0.005
ND
ND
0.05
Chromium (hexavalent)
ND
ND
ND
ND
ND
0.01
Lead
ND
ND
ND
ND
ND
0.05
Selenium
ND
ND
0.105
ND
ND
0.05
Anionic synthetic
detergents
–
–
–
–
–
0.01
pH (dimensionless)
–
–
–
–
–
0.3
202
5 Application Cases
values. The magnitude of excess reaches 32.5–130.00 times for nitrite, significantly
higher than that of Q2, so the operation of the landfill is considered the main cause.
In short, due to the operation of the landfill, sulfate, manganese, permanganate
index, nitrite and ammonia nitrogen in the groundwater exceed the limits by 1.06,
2.15–24.97, 1.15–2.06, 32.5–130.00, and 2.80–85.65 times respectively. This
affects groundwater from the landfill to the bank of the Jinma River.
(4) Groundwater pollution source intensity evaluation
The landfill is an existing source of groundwater pollution without seepage control.
According to the process shown in Fig. 3.3, the groundwater pollution source
intensity evaluation needs to consider the hazard of groundwater pollution sources
and the mitigation performance of the vadose zone. The vadose zone of the site is
mainly composed of artificially accumulated backfill, medium sand and pebbles,
Table 5.56 Water quality monitoring results for JK01–JK05 (Unit: mg/L)
Item
Detected values
Grade III
standards
JK01
JK02
JK03
JK04
JK05
pH (dimensionless)
7.4
6.9
7.7
7.5
7.4
6.5–8.5
Total hardness
335.3
405.4
205.2
332.8
360.3
450
Total soluble solids
450.7
734.6
357.3
483.1
518.3
1000
Sulfate
86.8
265.6
105.3
107.2
161.6
250
Chloride
17.02
54.95
16.31
20.92
10.64
250
Iron
ND
0.1
ND
ND
ND
0.3
Copper
0.215
2.497
1.99
0.038
ND
0.1
Zinc
ND
ND
ND
ND
ND
1.0
Volatile phenols
ND
ND
ND
ND
ND
1.0
Permanganate index
ND
ND
ND
ND
ND
0.002
Nitrate
1.2
6.19
3.44
2.04
1.38
3.0
Nitrite
28.01
10.5
9.59
29.92
30.52
20
Ammonia nitrogen
0.65
2.6
2.54
1.03
0.97
0.02
Fluoride
5.41
17.13
1.14
2.39
0.56
0.2
Cyanide
0.34
0.69
0.88
0.64
0.6
1.0
Mercury
ND
ND
ND
ND
ND
0.05
Arsenic
ND
ND
ND
ND
ND
0.001
Cadmium
ND
ND
0.005
ND
ND
0.05
Chromium (hexavalent)
ND
ND
ND
ND
ND
0.01
Lead
ND
ND
ND
ND
ND
0.05
Selenium
ND
ND
0.105
ND
ND
0.05
Anionic synthetic
detergents
–
–
–
–
–
0.01
pH (dimensionless)
–
–
–
–
–
0.3
202
5 Application Cases