Table 454 National Pretreatment Standards

1. General Prohibitions: A user may not introduce into a publicly owned treatment works, POTW, any pollutant(s) which cause "pass through" without a change in nature or "interference" with treatment processes, including sludge use or disposal.

2. Specific Prohibitions: The following pollutants shall not be introduced into a POTW:

a. Pollutants which create a fire or explosion hazard in the POTW;

b. Pollutants which will cause corrosive structural damage to the POTW, but in no case discharges with pH lower than 5.0, unless the works is specifically designed to accommodate such discharges;

c. Solid or viscous pollutants in amounts which will cause obstruction to the flow in the POTW resulting in interference;

d. Any pollutant, including oxygen, demanding pollutants (BOD, etc.) released in a discharge at a flow rate and/or pollutant concentration which will cause interference with the POTW;

e. Heat in amounts which will inhibit biological activity in the POTW resulting in interference, but in no case heat in such quantities that the temperature at the POTW exceeds 40° C (104° F) unless the approval authority, upon request of the POTW, approves alternate temperature limits.

3. Categorical Requirements: Standards specifying quantities or concentrations of pollutants or pollutant properties which may be discharged to a POTW by existing or new industrial users in specific industrial subcategories will be established as separate regulations under the appropriate subpart of 40 CFR Chapter 1, Subchapter N. These standards, unless specifically noted otherwise, shall be in addition to the general prohibitions established above (40 CFR 403.5).

Source: U.S. Environmental Protection Agency, 1973-1985, Secondary treatment regulation, Code of Federal Regulations, Title 40, part 133 (Washington, D.C.:

U.S. Government Printing Office).

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