Pretreatment standards metal finishing
Existing Sources (mg/L)
New Sources (mg/L)
a(T) Means total
TTO = Total Toxic Organics
CN, A means amenableto alkaline chlorination. This limit may apply
in place of Cyanide (T) for industrial facilities with cyanide
40 CFR Part 433
b. Non-compliance pollutants. The U.S. EPA
granted under certain conditions if the POTW has
the capacity to handle adequately the non-com-
regulations prohibit or control certain discharges
to municipal systems. Prohibited industrial dis-
patible pollutant. The U.S. EPA has been di-
rected to prepare categorical standards for indus-
charges which apply to all industrial users of
tries which are listed in table 4-11.
publicly owned treatment works (POTW's) are
listed in table 4-10. Categorical standards are
Table 4-10. Prohibited industrial discharges to
being developed by U.S. EPA and will specify
publicly owned treatment works (POTW'S)
maximum quantities of non-compatible pollutants
1. Pollutants that create a fire or explosion hazard, such as
which can be discharged to municipal systems.
fuels, solvents, etc.
2. Pollutants that cause corrosive structural damage, such as
These limitations will be equal to or greater than
acids, bases, solvents, etc.
best available treatment limitations for specified
3. Any discharge with a pH less than 5 unless the POTW is
substances. Incompatible pollutants are defined
specifically designed for same.
as those substances which will require pretreat-
4. Pollutants in amounts that create obstructions to flow in
rivers or to the operation of the POTW.
5. Any pollutant discharged in an amount or strength that
interferes with the POTW.
able pass-through of the substance to a receiving
6. Heat in an amount that interferes with the POTW.
stream or to the atmosphere. Exceptions to
7. Heat which causes the influent temperature to rise above
c a t e g o r i c a l pretreatment standards may be