Table 5.122
Output and discharge data of wastewater pollution sources in the hazardous wastes disposal sites
Description
Yield
(m
3
/a)
Pollutants
Output of pollutants
Mode of disposal
Discharge of pollutants
Standard
(mg/L)
Discharge
destination
Concentration
(mg/L)
Rate
(t/a)
Discharge
concentration
(mg/L)
Discharge
rate (t/a)
Flushing
water of
solidifying
workshop
781.1
COD
500
0.39
oxidation
reduction + neutralization +
flocculation + precipitation + sand
filtration + activated carbon
filtration
/
/
/
Reused for
solidification
1353 m
3
/a;
5268.1 m
3
/a
Discharged into
the secondary
sewage
treatment
works of the
New Area
SS
400
0.31
/
/
/
Total chromium
0.8
0.0006
/
/
/
Total nickel
0.9
0.0007
/
/
/
Percolate
5840
COD
1500
8.76
100
0.66
100
SS
600
3.50
70
0.46
70
Total chromium
20
0.117
0.5
0.003
0.5
Total nickel
4.0
0.0234
1.5
0.008
1.5
Hexavalent
chromium
1
0.0058
0.5
0.0026
0.5
Pb
2
0.0117
1
0.0053
1.0
Total mercury
0.08
0.0005
0.05
0.0003
0.05
Total zinc
25
0.146
2
0.010
2.0
Total nickel
5
0.0292
1
0.0053
1.0
Total copper
25
0.146
0.5
0.003
0.5
Total cadmium
0.2
0.0012
0.1
0.0005
0.1
Total cadmium
1.0
0.0058
0.5
0.0026
0.5
Chroma
300 times
/
40 times
/
50 times
Other
flushing
wastewater;
laboratory
wastewater;
initial
rainwater
2891.5 pH
3–6, 10–12
Neutralization,
sedimentation
6–9
6
–9
2891.5 m
3
/a
The secondary
sewage
treatment
works of the
New Area
COD
400
1.16
350
1.01
500
SS
300
0.87
250
0.72
400
Domestic
sewage
950.4
COD
350
0.33
Septic tank
350
0.33
500
950.4 m
3
/a
The secondary
sewage
treatment
works of the
New Area
SS
300
0.29
300
0.29
400
Ammonia-nitrogen 35
0.033
35
0.033
35
Total phosphorus
3
0.003
3
0.003
8
5.6 East China
363