THERMO TECH TECHNOLOGIES INC
SC 13D, 1996-11-19
REFUSE SYSTEMS
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                                 UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

                                  SCHEDULE 13D

                   Under the Securities Exchange Act of 1934
                              (Amendment No. 4)*



                        Thermo Tech Technologies, Inc.
________________________________________________________________________________
                               (Name of Issuer)


                          Common Stock, no par value
________________________________________________________________________________
                        (Title of Class of Securities)


                                   88360H101
        _______________________________________________________________
                                (CUSIP Number)

                              Charles H. Winkler
                          Citadel Limited Partnership
                          225 West Washington Street
                                   Suite 900
                               Chicago, IL 60606
                                (312) 696-2102
________________________________________________________________________________
(Name, Address and Telephone Number of Person Authorized to Receive Notices and
                                Communications)

                               November 8, 1996
        _______________________________________________________________
            (Date of Event which Requires Filing of this Statement)


If the filing person has previously filed a statement on Schedule 13G to report
the acquisition which is the subject of this Schedule 13D, and is filing this
schedule because of Rule 13d-1(b)(3) or (4), check the following box [_].

Check the following box if a fee is being paid with the statement [_]. (A fee is
not required only if the reporting 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
disclosures provided in a prior cover page.

The information required on 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
<PAGE>
 

                                 SCHEDULE 13D
- ----------------------- 
  CUSIP NO. 88360H101     
- -----------------------
 
- ------------------------------------------------------------------------------
      NAME OF REPORTING PERSON
 1    S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
             Citadel Limited Partnership             
             FEIN No.: 36-3754834                            
- ------------------------------------------------------------------------------
      CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
 2                                                              (a) [_]
                                                                (b) [X]
- ------------------------------------------------------------------------------
      SEC USE ONLY
 3
 
- ------------------------------------------------------------------------------
      SOURCE OF FUNDS*
 4           AF
      
- ------------------------------------------------------------------------------
      CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT 
      TO ITEMS 2(d) or 2(e) [_]
 5    
- ------------------------------------------------------------------------------
      CITIZENSHIP OR PLACE OF ORGANIZATION
 6           U.S.
     
- ------------------------------------------------------------------------------
                          SOLE VOTING POWER
                     7         Reporting person has voting and dispositive
                               power over (i) 8% Convertible Debentures which
     NUMBER OF                 are convertible into 580,547 shares of Common
                               Stock, no par value, as of the date for the
      SHARES                   filing of this statement and (ii) 129,867 
                               shares of Common Stock.
   BENEFICIALLY    -----------------------------------------------------------
                          SHARED VOTING POWER
     OWNED BY        8         -0-  
                          
       EACH                      
                   -----------------------------------------------------------
    REPORTING             SOLE DISPOSITIVE POWER
                     9         See item 7 above.
      PERSON              
                         
       WITH        -----------------------------------------------------------
                          SHARED DISPOSITIVE POWER
                    10         -0-
                                 
- ------------------------------------------------------------------------------
      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
11           See item 7 above.
      
      
- ------------------------------------------------------------------------------
      CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES*
12                  
      [_]
- ------------------------------------------------------------------------------
      PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
13           3.74% as of the date for the filing of this statement. (Based on
             18,282,019 shares of Common Stock issued and outstanding as of
             September 4, 1996 plus the shares of Common Stock referred to in
             item 7 above.)     
- ------------------------------------------------------------------------------
      TYPE OF REPORTING PERSON*
14           PN
      
- ------------------------------------------------------------------------------
                     *SEE INSTRUCTIONS BEFORE FILLING OUT!
         INCLUDE BOTH SIDES OF THE COVER PAGE, RESPONSES TO ITEMS 1-7
     (INCLUDING EXHIBITS) OF THE SCHEDULE, AND THE SIGNATURE ATTESTATION.

                                                               Page 2 of 5 Pages
<PAGE>
 
     This is the fourth amendment to the Schedule 13D previously filed by the
reporting person with respect to the securities of the issuer set forth on the
cover page hereto (such initial filing, together with any prior amendments
thereto, the "Prior Filing"). This amendment is being filed in order to amend
and restate Item 5 of the Prior Filing in its entirety in connection with sales
of the issuer's common stock by affiliates of the reporting person.

ITEM 5. INTEREST IN SECURITIES OF THE ISSUER

     (a)  By reason of its serving as managing general partner of Nelson and
          trading manager of Olympus, Citadel may be deemed to be the indirect
          beneficial owner of the Convertible Securities, including the shares
          of Common Stock into which the Convertible Securities are convertible,
          and shares of Common Stock held by Nelson and Olympus.  As of the date
          for the filing of this statement, Nelson and Olympus collectively own
          Convertible Securities for which they originally paid $210,000
          ("Stated Value") and 129,867 shares of Common Stock.

          As of any date ("Conversion Date") all or a portion of the Convertible
          Securities may be converted into the number of shares of Common Stock
          determined by dividing the Stated Value of such securities (plus an
          amount equal to 8% interest on the Stated Value of such securities
          from the Closing Date) by a conversion price ("Conversion Price").
          The Conversion Price is equal to the lesser of (i) $2.2125 and (ii)
          85% of the average closing bid price (as reported by NASDAQ or such
          other market or exchange as the Common Stock is then traded) of the
          Issuer's Common Stock for the five trading days immediately preceding
          the Conversion Date.

          If the Company's Common Stock is trading at a price less than $2.60,
          the Conversion Price will fluctuate depending upon the closing bid
          price of the Issuer's Common Stock.  As a consequence, the number of
          shares of Common Stock into which the Convertible Securities may be
          converted, and consequently the number of shares of such securities
          which Citadel may be deemed to beneficially own, may fluctuate on a
          daily basis based solely on the Common Stock's market price and
          without any action taken by Citadel, Nelson or Olympus.

          As of the date for the filing of this statement, by virtue of its
          status as the managing general partner of Nelson and the trading
          manager for Olympus, Citadel may be deemed to be the beneficial owner
          of 710,414 shares of Common Stock representing 3.74% of the Issuer's
          Common Stock (based on (i) 18,282,019 shares of Common Stock issued
          and outstanding as set forth in the Issuer's most recently filed 6-K
          and (ii) a Conversion Price equal to $.3825).

     (b)  Citadel has the sole power to vote and the sole power to dispose of
          the Convertible Securities, the Common Stock into which the
          Convertible Securities are convertible and the Common Stock held by
          Nelson and Olympus on behalf of each of Nelson and Olympus.

     (c)  The following transactions with respect to the Issuer's common stock
          have been effected during the 61-day period ending November 8, 1996:

<TABLE>
<CAPTION>
Transaction Date      Transacting Party  Transaction  Quantity  Price
- ----------------      -----------------  -----------  --------  -----
<S>                   <C>                <C>          <C>       <C>
November 8, 1996      Nelson             Sell           50,000  $ .44
November 8, 1996      Olympus            Sell           25,000  $ .44
November 5, 1996      Nelson             Sell          112,500  $ .42
November 5, 1996      Olympus            Sell          112,500  $ .42
October 30, 1996      Nelson             Sell            3,350  $ .31
October 30, 1996      Olympus            Sell              950  $ .31
October 28, 1996      Nelson             Sell          165,000  $ .36
October 28, 1996      Olympus            Sell          100,000  $ .36
October 23, 1996      Nelson             Sell            8,200  $ .38
October 23, 1996      Olympus            Sell           10,600  $ .38
October 22, 1996      Nelson             Sell           42,000  $ .40
October 22, 1996      Nelson             Sell           43,000  $ .40
October 21, 1996      Nelson             Sell           30,000  $ .45
October 21, 1996      Olympus            Sell           20,000  $ .45
October 18, 1996      Nelson             Sell           55,000  $ .47
October 18, 1996      Olympus            Sell           45,000  $ .47
October 16, 1996      Nelson             Sell           49,000  $ .48
October 16, 1996      Nelson             Sell           35,000  $ .48
October 15, 1996      Nelson             Sell           37,200  $ .56
October 15, 1996      Olympus            Sell           26,600  $ .56
October 14, 1996      Nelson             Sell          156,600  $ .63
October 14, 1996      Olympus            Sell           76,400  $ .63
October 11, 1996      Nelson             Sell           50,000  $ .60
</TABLE> 

                                                               Page 3 of 5 Pages
<PAGE>
 
<TABLE> 
<S>                   <C>                <C>          <C>       <C>
October 11, 1996      Olympus            Sell           25,000  $ .60
October 10, 1996      Nelson             Sell          178,000  $ .66
October 10, 1996      Olympus            Sell           89,000  $ .66
October 9, 1996       Nelson             Sell          175,400  $ .50
October 9, 1996       Olympus            Sell           81,600  $ .50
October 8, 1996       Nelson             Sell           60,000  $ .47
October 7, 1996       Nelson             Sell           58,500  $ .63
October 7, 1996       Olympus            Sell           58,500  $ .63
September 24, 1996    Nelson             Sell           50,000  $1.10
</TABLE>

     (d)  Nelson and Olympus, as the direct beneficial and legal owners of the
          Convertible Securities and the Common Stock, have the right to receive
          or the power to direct the receipt of dividends from, or the proceeds
          from the sale of the Convertible Securities, the Common Stock into
          which the Convertible Securities are convertible and the Common Stock
          held by them.  However, Citadel, as managing general partner of Nelson
          and trading manager for Olympus, ultimately has the right to direct
          such activities.

     (e)  As of the date for the filing of this statement, Nelson and Olympus
          collectively own less than 5% of the Issuer's Common Stock.  As a
          consequence, from and after such date Citadel shall not be deemed to
          be the beneficial owner of more than 5% of the Issuer's Common Stock.

                                                               Page 4 of 5 Pages
<PAGE>
 
                                      SIGNATURE

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

Date:  November 15, 1996         Citadel Limited Partnership
 
                                 By:  GLB Partners, L.P.,
                                      its general partner

                                 By:  Citadel Investment Group, L.L.C.,
                                      its general partner
 
                                 By:  /s/Kenneth C. Griffin,
                                      ----------------------
                                      its manager

                                                               Page 5 of 5 PAges


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