Table 4.7
Summary of classical and toxic pollutants in carbon and graphite subcategory raw wastewater by individual process units
Pollutant
Number of samples/number
of detection
Range of
detections
Mean of
detections
Median of
detections
Number of samples/number
of detection
Range of
detections
Machining,
flow ¼ 0.32 L/S
Classical pollutants
mg/L
TSS
3/3
53–5,000
1,600
1,600
1/1
630
TOC
3/3
190–7,200
2,700
680
1/1
120
BOD
3/2
6–23
16
1/1
a
Oil and grease
3/3
7–70
32
20
1/1
9.5
Phenols
3/3
0.01–0.12
0.05
0.20
1/1
<0.005
pH, pH units
1/1
7.1
Calcium
3/3
8.5–38
20
14
–
–
Magnesium
3/3
1.2–8.3
3.8
1.8
–
–
Sodium
3/3
11–20
15
13
–
–
Aluminum
3/3
0.23–2.2
0.94
0.42
–
–
Magnesium
3/3
0.006–0.071
0.048
0.066
–
–
Vanadium
3/3
0.023–0.12
0.075
0.082
–
–
Boron
3/3
0.041–0.042
0.19
0.11
–
–
Barium
3/3
0.085–0.88
0.48
0.48
–
–
Molybdenum
3/3
0. 2–0.44
0.16
0.02
–
–
Tin
3/3
0.013–0.21
0.086
0.035
–
–
Yttrium
3/3
<0.004–0.007 <0.005
0.004
–
–
Cobalt
3/3
0.013–<0.051 <0.038
<0.051
–
–
Iron
3/3
0.57–6.7
3.3
2.6
–
–
Titanium
3/3
0.047–0.34
0.14
0.05
–
–
126
O. S. Amuda et al.