For small system compliance, GAC, POU-GAC, and PAC can be used to remove
endosulfan from drinking water supplies (see Table 4.3) [9, 51, 52].
6.3 DDT
The BAT for removal of DDT from drinking water is GAC. In the USEPA report
[42], the following K values, as determined by the Freundlich equation and actual
test, were determined: DDT has a K value of 10,449μg/g (L/μg)
1/n which is sufficiently above the cutoff point of 200μg/g (L/μg)
1/n to be judged an effective
treatment method and DDE (a DDT metabolite with endocrine activity) of
18,000μg/g (L/μg)
1/n .
6.4 Diethyl Phthalate
The BAT for removal of diethyl phthalate from drinking water is GAC. In the
USEPA report [51], the following K value, as determined by the Freundlich equation
and actual test for diethyl phthalate, yielded a K value of 17,037μg/g (L/μg)
1/n .
6.5 Di-(2ethylhexyl) Phthalate (DEHP)
The BAT for removal of DEHP from drinking water is GAC. In the USEPA report
[42], the following K value, as determined by the Freundlich equation and the test,
was determined. DEHP has a K value of 8308μg/g (L/μg)
1/n which is one of the
Table 4.3 Isotherm Constants for Selected EDCs (U. S. EPA, 9)
Isotherm Constants
Calculated Value
Chemical
K mg/g (L/mg)
1/n
1/n
μg/g (L/μg)
1/n
Alpha-endosulfan
194
0.50
6135
Beta-endosulfan
615
0.83
1990
Endosulfan sulfate
686
0.81
2548
DDT
332
0.50
10,499
DDE
232
0.37
18,000
Diethyl phthalate (DEP)
110
0.27
17,037
Diethylhexyl phthalate (DEHP)
11,300
1.50
8308
PCB-1221
242
0.70
1922
PCB-1232
630
0.73
4067
Nonylphenol
250
0.37
19,406
4 Endocrine Disruptors
189
endosulfan from drinking water supplies (see Table 4.3) [9, 51, 52].
6.3 DDT
The BAT for removal of DDT from drinking water is GAC. In the USEPA report
[42], the following K values, as determined by the Freundlich equation and actual
test, were determined: DDT has a K value of 10,449μg/g (L/μg)
1/n which is sufficiently above the cutoff point of 200μg/g (L/μg)
1/n to be judged an effective
treatment method and DDE (a DDT metabolite with endocrine activity) of
18,000μg/g (L/μg)
1/n .
6.4 Diethyl Phthalate
The BAT for removal of diethyl phthalate from drinking water is GAC. In the
USEPA report [51], the following K value, as determined by the Freundlich equation
and actual test for diethyl phthalate, yielded a K value of 17,037μg/g (L/μg)
1/n .
6.5 Di-(2ethylhexyl) Phthalate (DEHP)
The BAT for removal of DEHP from drinking water is GAC. In the USEPA report
[42], the following K value, as determined by the Freundlich equation and the test,
was determined. DEHP has a K value of 8308μg/g (L/μg)
1/n which is one of the
Table 4.3 Isotherm Constants for Selected EDCs (U. S. EPA, 9)
Isotherm Constants
Calculated Value
Chemical
K mg/g (L/mg)
1/n
1/n
μg/g (L/μg)
1/n
Alpha-endosulfan
194
0.50
6135
Beta-endosulfan
615
0.83
1990
Endosulfan sulfate
686
0.81
2548
DDT
332
0.50
10,499
DDE
232
0.37
18,000
Diethyl phthalate (DEP)
110
0.27
17,037
Diethylhexyl phthalate (DEHP)
11,300
1.50
8308
PCB-1221
242
0.70
1922
PCB-1232
630
0.73
4067
Nonylphenol
250
0.37
19,406
4 Endocrine Disruptors
189