[Code of Federal Regulations]

[Title 40, Volume 28]

[Revised as of July 1, 2006]

From the U.S. Government Printing Office via GPO Access

[CITE: 40CFR421.32]



[Page 468]

 

                   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:



                          Effluent Limitations

------------------------------------------------------------------------

                                                 Average of daily values

            Effluent characteristic              for 30 consecutive days

                                                    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.





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