EXHIBIT 10 (fff)


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                                   ----------

                              THE TIREX CORPORATION

                          SECURITY AND PLEDGE AGREEMENT

                                   ----------

      This Security and Pledge Agreement (this "Agreement") is made this 8th day
of April by and  between  The  Tirex  Corporation,  740 St.  Maurice,  Suite 201
Montreal,  Quebec H3C 1L5,  ("Pledgee")  and Louis Sanzaro,  1497 Lakewood Road,
Toms River,  NJ 08755 (the  "Pledgor") in connection  with the Pledgee's loan of
$70,405.31 (the "Loan") granted by the Pledgee to the Pledgor  contemporaneously
herewith  pursuant  to the  Pledgee's  secured  promissory  note,  of even  date
herewith, wherefore it is agreed:

1.    Pledge

      The  Pledgor  hereby  assigns,  by  way of the  duly  endorsed,  medallion
guaranteed stock power attached hereto,  and hereby  authorizes  delivery by the
Pledgor's transfer agent to the Pledgee of a certificate (the  "Certificate") to
be issued forthwith to the Pledgee pursuant to the terms of a certain consulting
agreement,  dated  January 28, 1998, by and between the Pledgee and the Pledgor,
which  Certificate  shall  represent  400,000  shares of the common stock of the
Pledgee (the "Shares").

2.    Term

      The Pledgee  shall hold the Shares as security to assure the  repayment of
the Loan and such Shares shall  remain so pledged  until the said Loan is repaid
in full with interest.

3.    Voting

      At all meetings of shareholders for the election of directors, held at any
time while the Loan or any part  thereof  remains  unpaid,  such shares shall be
voted by the Pledgor.

4.    Dividends

      All dividends and other  amounts  hereafter  declared on the Shares during
the term of this  pledge  shall be paid  over to the  Pledgor  immediately  upon
receipt.


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5.    Adjustments

      In the event that,  during the term of this  pledge,  any share  dividend,
reclassification,  readjustment,  or other  change  is  declared  or made in the
capital structure of the Pledgor, all new, substituted,  or additional shares or
other  securities  , issued by  reason of any such  change  shall be held by the
Pledgee  under  the terms of this  agreement  in the same  manner as the  Shares
originally pledged hereunder.

6.    Redelivery of Pledge

      Upon payment at or before  maturity of the  principal  and interest of the
Loan, the Pledgee shall immediately  redeliver the Shares and the stock power to
the Pledgor, and this agreement shall terminate.

7.    Assignment

      This  Agreement  may be  assigned  by the  Pledgee  as part of the sale of
substantially all of its business;

8.    Notices

      8.1 All  notices  required or  permitted  to be given  hereunder  shall be
delivered by hand, certified mail, or recognized overnight courier, in all cases
with written  proof of receipt  required,  addressed to the parties as set forth
below and shall be deemed  given upon  receipt as evidenced by written and dated
receipt of the receiving party.

      8.2 Any notice to the Pledgee or to any  assignee of the Pledgee  shall be
addressed as follows:

                           The Tirex Corporation
                           740 St. Maurice, Suite 201
                           Montreal, Quebec
                           Canada H3C 1L5

      8.3 Any notice to Pledgor shall be addressed as follows:

                           Louis Sanzaro
                           1497 Lakewood Road
                           Toms River, NJ 08755

      8.4 Either  party may change  the  address to which  notice to it is to be
addressed, by notice as provided herein.


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9.    Applicable Law

      This Agreement  shall be interpreted  and enforced in accordance  with the
laws of the State of Delaware.

10.   Interpretation

      Whenever possible,  each Article of this Agreement shall be interpreted in
such  manner as to be  effective  and valid  under  applicable  law,  but if any
Article is  unenforceable  or  invalid  under such law,  such  Article  shall be
ineffective only to the extent of such  unenforceability or invalidity,  and the
remainder of such Article and the balance of this Agreement  shall in such event
continue to be binding and in full force and effect.

      In Witness  Whereof,  the parties hereto have executed the above Agreement
as of the day and year first above written.


                                          THE TIREX CORPORATION

                                          By /s/ Terence C. Byrne
                                             -----------------------------------
                                                 Terence C. Byrne, President

                                          By /s/ Louis Sanzaro
                                             -----------------------------------
                                                 Louis Sanzaro, Pledgor


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