The provisions of this subpart are applicable to process wastewater discharges resulting from any tannery which processes previously tanned hides and skins (grain side only) into finished leather by retan-wet finishing.
Except as provided in 40 CFR 125.30 through 125.32, any existing point source subject to this subpart must achieve the following effluent limitations representing the degree of effluent reduction attainable by the application of the best practicable control technology currently available (BPT):
| Pollutant or pollutant property
| BPT limitations
|
|---|
| Maximum for any 1 day
| Maximum for monthly average
|
|---|
| | Kg/kkg (or pounds per 1,000 pounds) of raw material
|
| BOD5 | 8.9 | 4.0
|
| TSS | 12.8 | 5.8
|
| Oil & Grease | 3.7 | 1.7
|
| Total Chromium | 0.23 | 0.08
|
| pH | (
1) | (
1)
|
Except as provided in 40 CFR 125.30 through 125.32, any existing point source subject to this subpart must achieve the following effluent limitations representing the degree of effluent reduction attainable by the application of the best conventional pollutant control technology (BCT): The effluent limitations are those for BOD5, TSS, Oil and Grease, and pH contained in § 425.41.
Except as provided in 40 CFR 125.30 through 125.32, any existing point source subject to this subpart must achieve the following effluent limitations representing the degree of effluent reduction attainable by the application of the best available technology economically achievable (BAT): The effluent limitations are those for Total Chromium contained in § 425.41.
Any new source subject to this subpart must achieve the following new source performance standards (NSPS):
| Pollutant or pollutant property
| NSPS
|
|---|
| Maximum for any 1 day
| Maximum for monthly average
|
|---|
| | Kg/kkg (or pounds per 1,000 pounds) of raw material
|
| BOD5 | 6.5 | 2.9
|
| TSS | 9.3 | 4.3
|
| Oil & Grease | 2.7 | 1.2
|
| Total Chromium | 0.17 | 0.06
|
| pH | (
1) | (
1)
|
Except as provided in 40 CFR 403.7 and 403.13, any existing source subject to this subpart that introduces process wastewater pollutants into a publicly owned treatment works must comply with 40 CFR part 403, and achieve the following pretreatment standards:
| Pollutant or pollutant property
| PSES
|
|---|
| Maximum for any 1 day
| Maximum for monthly average
|
|---|
| | Milligrams per liter (mg/l)
|
| Total Chromium | 19 | 12
|
| pH | (
1) | (
1)
|
Except as provided in 40 CFR 403.7, any new source subject to this subpart that introduces process wastewater pollutants into a publicly owned treatment works must comply with 40 CFR part 403, and achieve the pretreatment standards contained in § 425.45.