Section 417.156 - Pretreatment standards for new sourcesAny new source subject to this subpart that introduces process wastewater pollutants into a publicly owned treatment works must comply with 40 CFR part 403 . In addition, the following pretreatment standards establishes the quantity or quality of pollutants or pollutant properties, controlled by this section, which may be discharged to a publicly owned treatment works by a new source subject to the provisions of this subpart.
(a) There shall be no discharge of waste water streams in which both the COD/BOD7 ratio exceeds 10.0 and the COD exceeds 2.4 kg/kkg of anhydrous product.(b) For waste streams having either a ratio of COD to BOD7 of 10.0 or less or having a COD content of 2.40 kg/kkg of anhydrous product or less the pretreatment standard shall be:(1) For normal operation of spray drying towers above, the following values pertain: | Pollutant or pollutant property | Pretreatment standard |
| BOD5 | No limitations. |
| COD | Do. |
| TSS | Do. |
| Surfactants | Do. |
| Oil and grease | Do. |
| pH | Do. |
(2) For air quality restricted operation of a spray drying tower, but only when a high rate of wet scrubbing is in operation which produces more waste water than can be recycled to process, the following values pertain: | Pollutant or pollutant property | Pretreatment standard |
| BOD5 | No limitations. |
| COD | Do. |
| TSS | Do. |
| Surfactants | Do. |
| Oil and grease | Do. |
| pH | Do. |
(3) For fast turnaround operation of a spray tower, the following values pertain: The maximum for any one day when the number of turnarounds exceeds six in any particular thirty consecutive day period shall be the sum of the appropriate value below and that from paragraph (b) (1) or (2) of this section; and the average of daily values for thirty consecutive days shall be the value shown below multiplied by the number of turnarounds in excess of six and prorated to thirty days plus the appropriate value form paragraph (b) (1) or (2) of this section. | Pollutant or pollutant property | Pretreatment standard |
| BOD5 | No limitations. |
| COD | Do. |
| TSS | Do. |
| Surfactants | Do. |
| Oil and grease | Do. |
| pH | Do. |
40 FR 27454, June 30, 1975, as amended at 60 FR 33955, June 29, 1995