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                                 UNITED STATES
                      SECURITIES AND EXCHANGE COMMISSION
                            Washington, D.C. 20549


                                 SCHEDULE 13G


                   Under the Securities Exchange Act of 1934
                             (Amendment No. 12)*


                           Calgon Carbon Corporation
--------------------------------------------------------------------------------
                               (Name of Issuer)

                    Common Stock, par value $.01 per share
--------------------------------------------------------------------------------
                        (Title of Class of Securities)

                                  129603 10 6
                        ------------------------------
                                (CUSIP Number)

Check the following box if a fee is being paid with this statement [X]. (A fee
is not required only if the filing person: (1) has a previous statement on file
reporting beneficial ownership of more than five percent of the class of
securities described in Item 1: and (2) has filed no amendment subsequent
thereto reporting beneficial ownership of five percent or less of such class).
(See Rule 13d-7).

*The remainder of this cover page shall be filled out for a reporting person's
initial filing on this form with respect to the subject class of securities, and
for any subsequent amendment containing information which would alter the
disclosures provided in a prior cover page.

The information required in the remainder of this cover page shall not be deemed
to be "filed" for the purpose of Section 18 of the Securities Exchange Act of
1934 ("Act") or otherwise subject to the liabilities of that section of the Act
but shall be subject to all other provisions of the Act (however, see the
Notes).

                               Page 1 of 5 pages



  ------------------------                           -------------------------
  CUSIP No. 129603 10                 13G              Page  2  of  5  Pages
           ------------                                     ---    ---
  ------------------------                           -------------------------

------------------------------------------------------------------------------
      NAME OF REPORTING PERSON
 1.   S.S. or I.R.S. IDENTIFICATION NO. OF ABOVE PERSON


      Thomas A. McConomy
------------------------------------------------------------------------------
      CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
 2.                                                             (a) [_]
                                                                (b) [_]

------------------------------------------------------------------------------
      SEC USE ONLY
 3.


------------------------------------------------------------------------------
      CITIZENSHIP OR PLACE OF ORGANIZATION
 4.


------------------------------------------------------------------------------
                          SOLE VOTING POWER
                     5.
     NUMBER OF
                          4,354,375
      SHARES       -----------------------------------------------------------
                          SHARED VOTING POWER
   BENEFICIALLY      6.

     OWNED BY
                   -----------------------------------------------------------
       EACH               SOLE DISPOSITIVE POWER
                     7.
    REPORTING
                          4,354,375
      PERSON       -----------------------------------------------------------
                          SHARED DISPOSITIVE POWER
       WITH          8.

------------------------------------------------------------------------------
      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
 9.
      4,354,375
------------------------------------------------------------------------------
      CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*
10.
                                                                    [_]

------------------------------------------------------------------------------
      PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9
11.

      11.2%
------------------------------------------------------------------------------
      TYPE OF REPORTING PERSON*
12.

------------------------------------------------------------------------------
                    * SEE INSTRUCTIONS BEFORE FILLING OUT!



Item 1(a).  Name of Issuer
----------  --------------

             Calgon Carbon Corporation (the "Company")

Item 1(b).  Address of Issuer's Principal Executive Offices
----------  -----------------------------------------------

             P.O. Box 717
             Pittsburgh, PA 15230-0717

Item 2(a).  Name of Person Filing
----------  ---------------------

             Thomas A. McConomy

Item 2(b).  Address of Principal Business Office, or if None, Residence
----------  -----------------------------------------------------------

             The principal business address of the undersigned if:

                         413 Woodland Road
                         Sewickley, PA 15143

Item 2(c).  Citizenship
----------  -----------

             United States of America


Item 2(d).  Title of Class of Securities
----------  ----------------------------

             Common Stock, $.01 par value (the "Common Stock")

Item 2(e).  CUSIP No.
----------  ---------

             129603 10 6

Item 3.     Statement Field Pursuant To Rule 13d-1(b) or Rule 13d-2(b)
-------     ----------------------------------------------------------

             None of the categories is applicable to the undersigned.

Item 4.     Ownership
-------     ---------

            a)  Amount Beneficially Owned

            As calculated under Rule 13d-3, as of December 31, 2001, Thomas A.
McConomy beneficially owned 4,354,375 shares of Common Stock, of which 32,350
shares are those which he has a right to acquire pursuant to options granted
under the Company' 1993 Non-Employee Directors' Stock Option Plan, as amended.

                                  Page 3 of 5



          b)   Percent of Class.

          As calculated under Rule 13d-3, as of December 31, 2001, Mr. McConomy
beneficially owned 11.2% of the shares of Common Stock.

          b)   On December 31, 2001, Mr. McConomy had the sole power to vote and
dispose or direct the disposition of the 4,354,375 shares of Common Stock then
owned by him.

Item 5.   Ownership of Five Percent or less of a Class
-------   --------------------------------------------

           Inapplicable

Item 6.   Ownership of More Than Five Percent on Behalf of Another Person
-------   ---------------------------------------------------------------

           None

Item 7.   Identification and Classification of the Subsidiary Which Acquired
-------   the Security Being Reported on by the Parent Holding Company
          ------------------------------------------------------------

           Inapplicable

Item 8.   Identification and Classification of Members of the Group
-------   ---------------------------------------------------------

           Inapplicable

Item 9.   Notice of Dissolution of Group
-------   ------------------------------

           Inapplicable

Item 10.  Certification
--------  -------------

           Inapplicable

                                  Page 4 of 5


                                   SIGNATURE
                                   ---------


     After reasonable inquiry and to the best of my knowledge and belief, I
certify that the information set forth in this statement with respect to me is
true, complete and correct.


Dated: January 13, 2002                     /s/ Thomas A. McConomy
       ----------                           ----------------------
                                            Thomas A. McConomy

                                  Page 5 of 5