Environmental Engineering Reference
In-Depth Information
Table 5.1: National primary drinking water standards for selected contaminants [From ref.
296
.
Reprinted with permission].
Contaminant
Maximum contaminant level (ppm)
Antimony
0
.
006
Arsenic
0
.
010
Barium
2
Cadmium
0
.
005
Chromium
0
.
1
Copper
1
.
3
Lead
0
.
015
Selenium
0
.
05
Fluoride
4
.
0
Nitrate (as nitrogen)
10
.
0
Nitrite (as nitrogen)
1
.
0
Benzene
0
.
005
PAHs
0
.
0002
Toluene
1
.
0
Xylenes (total)
10
environment. The TSCA provides the EPA with authority to demand the premarket testing
and/or premanufacturing notices with details of procedures, the amount of products, properties
of products, methods of distribution, etc. Some fresh hydroprocessing catalysts (e.g.,
containing fluoride) may require regulation under this act.
The objective of Clean Water Act (CWA) is the protection of the quality of surface water that
affects ground water and vice versa. This requires water quality management plans with the
aim to control disposal of hazardous waste on land and to protect quality of the surface and
ground waters. The SDWA deals specifically with the quality of drinking water. It ensures the
safe supply of drinking water from public water supply systems. Several provisions refer
specifically to the ground water quality. The promulgation of drinking water quality standards
is required by Section 1412 of the SDWA. To meet requirements, the National Primary
Drinking Water Standards (NPDWS) and National Secondary Drinking Water Standards
(NSDWS) were developed by EPA. The former set maximum contaminant level and are
legally enforceable. The NSDWS are non-enforceable guidelines regulating contaminants,
which cause either cosmetic or esthetic effects in drinking water. Almost 90 species are listed
among NPDWS contaminants
[296]
. Those contaminants, which may be somehow relevant to
spent hydroprocessing catalysts are shown in
Table 5.1
. In addition, Ag, Al, Fe, Mn, Zn, and
sulfate are listed among the NSDWS contaminants.
