Parameters
Water quality after 18 h of settling
(mg/L)
Proposed federal drinking water
standards (mg/L)
Sample 2A
Ashtabula
Sample 4F
Fairport
Chromium
0.020
0.040
0.5
Cadmium
0.020
0.051
0.01
Zinc
0.095
0.025
5.0
Copper
0.040
0.060
1.0
Appendix E
Control technology summary for flotation (Source: US Environmental Protection Agency,
September 1981)
Pollutant
Effluent Concentration
Removal efficiency %
Range
Median
Range
Median
Classical pollutants, mg/L:
BOD (5-day)
140–1000
250
4–87
68
COD
18–3200
1200
8–96
66
TSS
18–740
82
6–98
88
Total phosphorus
<0.05–12
0.66
50–>99
98
Total phenols
> 0.001–23
0.66
3–>94
12
Oil and grease
16–220
84
57–97
79
Toxic pollutants, μg/L:
Antimony
ND-2300
20
4–95*
76
Arsenic
ND-18
<10
8–>99
45
Xylene
ND-1000
200
95–>99
97
Cadmium
BDL-< 72
3
0–>99
98*
Chromium
2–620
200
20–99
52
Copper
5–960
180
9–98
75
Cyanide
<10–2300
54
0–<62
10
Lead
ND-1000
70
9–>99
98
Mercury
BDL-2
BDL
33–88
75
Nickel
ND-270
41
29–>99
73
Selenium
BDL-8.5
2
NM
Silver
BDL-66
19
45
Thallium
BDL-50
14
NM
Zinc
ND-53000
200
12–>99
89
Bis(2-ethylhexyl) phthalate
30–1100
100
10–98
72
Butyl benzyl phthalate
ND-42
ND
97–>99
>99
Carbon tetrachloride
BDL-210
36
75
Chloroform
ND-24
9
20–>99
58
Dichlorobromomethane
ND
>99
(continued)
7 Lake Restoration
311