[Code of Federal Regulations]
[Title 40, Volume 26]
[Revised as of July 1, 2003]
From the U.S. Government Printing Office via GPO Access
[CITE: 40CFR421.32]

[Page 471-472]
 
                TITLE 40-PROTECTION OF ENVIRONMENT
 
      CHAPTER I-ENVIRONMENTAL PROTECTION AGENCY (CONTINUED)
 
PART 421-NONFERROUS METALS MANUFACTURING POINT SOURCE CATEGORY--Table of Contents
 
        Subpart C-Secondary Aluminum Smelting Subcategory
 
Sec. 421.32  Effluent limitations guidelines representing the degree of effluent reduction attainable by the application of the best practicable control 
          technology currently available.

    Except as provided in 40 CFR 125.30 through 125.32, any existing 
point source subject to this subpart shall achieve the following 
effluent limitations representing the degree of effluent reduction 
attainable by the application of the best practicable technology 
currently available:
    (a) The following limitations establish the quantity or quality of 
pollutants or pollutant properties, which may be discharged by a point 
source subject to the provisions of this subpart and which uses water 
for metal cooling, after application of the best practicable control 
technology currently available: There shall be no discharge of process 
wastewater pollutants to navigable waters.
    (b) The following limitations establish the quantity or quality of 
pollutants or pollutant properties which may be discharged by a point 
source subject to the provisions of this subpart and which uses aluminum 
fluoride in its magnesium removal process (``demagging 
process''), after application of the best practicable 
control technology currently available: There shall be no discharge of 
process wastewater pollutants to navigable waters.
    (c) The following limitations establish the quantity or quality of 
pollutants or pollutant properties controlled by this section, which may 
be discharged by a point source subject to the provisions of this 
subpart and which uses chlorine in its magnesium removal process, after 
application of the best practicable control technology currently 
available:

                          Effluent Limitations
------------------------------------------------------------------------
                                             Average of daily values for
          Effluent characteristic             30 consecutive days shall
                                             not exceed-
------------------------------------------------------------------------
                                             Metric units (kilograms per
                                             1,000 kg magnesium removed)

                                           -----------------------------
TSS.......................................                           175
COD.......................................                           6.5
pH........................................                        ( \1\)
------------------------------------------------------------------------
\1\ Within the range of 7.5 to 9.0.

    (d) The following limitations establish the quantity or quality of 
pollutants or pollutant properties which may be discharged by a point 
source subject to the provisions of this subpart and which processes 
residues by wet methods, after application of the best practical control 
technology currently available:

[[Page 472]]



                          Effluent Limitations
------------------------------------------------------------------------
                                                 Average of daily values
                                                 for 30 consecutive days
            Effluent characteristic              shall not exceed-
                                                         
------------------------------------------------------------------------
                                                 Metric units (kilograms
                                                     per 1,000 kg of
                                                         product)

                                                ------------------------
TSS............................................                      1.5
Fluoride.......................................                      0.4
Ammonia (as N).................................                     0.01
Aluminum.......................................                      1.0
Copper.........................................                    0.003
COD............................................                      1.0
pH.............................................                   ( \1\)
------------------------------------------------------------------------
\1\ Within the range of 7.5 to 9.0.