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

                                  SCHEDULE 13D
                    Under the Securities Exchange Act of 1934
                              (Amendment No. ___)*

                         QUANTA CAPITAL HOLDINGS LIMITED
                         -------------------------------
                                (Name of Issuer)

                    Common Stock, $0.01 par value per share
                    ---------------------------------------
                         (Title of Class of Securities)

                                   G7313F106
                           --------------------------
                                 (CUSIP Number)

                                Brad Huntington
                       Brevan Howard P&C Partners Limited
                               12 Bermudiana Road
                                   3rd Floor
                                  Hamilton, HMAX
                                     Bermuda
                                  +14412929774
                           --------------------------
                  (Name, Address and Telephone Number of Person
                Authorized to Receive Notices and Communications)

                                November 2, 2007
                           --------------------------
             (Date of Event which Requires Filing of this Statement)


If the filing Persons has previously filed a statement on Schedule 13G to report
the  acquisition  that is the subject of this  Schedule  13D, and is filing this
statement because of ss.ss.240.13d-1(e), 240.13d-1(f) or 240.13d-1(g), check the
following box. [ ]

Note:  Schedules  filed in paper format shall include a signed original and five
copies of the  schedule,  including  all exhibits.  See  ss.240.13d-7  for other
parties to whom copies are to be sent.

* 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).




                                  SCHEDULE 13G

CUSIP No.: G7313F106                                         Page 2 of 12 Pages

.................................................................................
1.       Names of Reporting Persons.

         I.R.S. Identification Nos. of above persons (entities only).


         BREVAN HOWARD P&C PARTNERS LIMITED
.................................................................................
2.       Check the Appropriate Box if a Member of a Group

          (a) [  ]

          (b) [  ]
.................................................................................
3.       SEC Use Only

.................................................................................
4.       Source of Funds (See Instructions)

         WC
.................................................................................
5.       Check if Disclosure of Legal Proceedings is Required Pursuant to
         Items 2(d) or 2(e)

         [ ]
.................................................................................

6.       Citizenship or Place of Organization

         BERMUDA
.................................................................................

Number of       7.     Sole Voting Power                  None
Shares
Beneficially    ................................................................
Owned by Each
Reporting       8.     Shared Voting Power                4,493,045
Person With     ................................................................

                9.     Sole Dispositive Power             None
                ................................................................

                10.    Shared Dispositive Power           4,493,045
.................................................................................

11.      Aggregate Amount Beneficially Owned by Each Reporting Person

         4,493,045
.................................................................................

12.      Check if the Aggregate Amount in Row (9) Excludes Certain Shares (See
         Instructions)

         |_|
.................................................................................

13.      Percent of Class Represented by Amount in Row (9)

         6.41% based on 70,107,240 shares outstanding as of August 1, 2007.
.................................................................................

14.      Type of Reporting Person:

         PN



                                  SCHEDULE 13G

CUSIP No.: G7313F106                                         Page 3 of 12 Pages

.................................................................................
1.       Names of Reporting Persons.

         I.R.S. Identification Nos. of above persons (entities only).


         ARMOUR GROUP HOLDINGS LIMITED
.................................................................................
2.       Check the Appropriate Box if a Member of a Group

          (a) [  ]

          (b) [  ]
.................................................................................
3.       SEC Use Only

.................................................................................
4.       Source of Funds (See Instructions)

         WC
.................................................................................
5.       Check if Disclosure of Legal Proceedings is Required Pursuant to
         Items 2(d) or 2(e)

         [ ]
.................................................................................

6.       Citizenship or Place of Organization

         CAYMAN ISLANDS
.................................................................................

Number of       7.     Sole Voting Power                  None
Shares
Beneficially    ................................................................
Owned by Each
Reporting       8.     Shared Voting Power                4,493,045
Person With     ................................................................

                9.     Sole Dispositive Power             None
                ................................................................

                10.    Shared Dispositive Power           4,493,045
.................................................................................

11.      Aggregate Amount Beneficially Owned by Each Reporting Person

         4,493,045
.................................................................................

12.      Check if the Aggregate Amount in Row (9) Excludes Certain Shares (See
         Instructions)

         |_|
.................................................................................

13.      Percent of Class Represented by Amount in Row (9)

         6.41% based on 70,107,240 shares outstanding as of August 1, 2007.
.................................................................................

14.      Type of Reporting Person:

         OO



                                  SCHEDULE 13G

CUSIP No.: G7313F106                                         Page 4 of 12 Pages

.................................................................................
1.       Names of Reporting Persons.

         I.R.S. Identification Nos. of above persons (entities only).


         BREVAN HOWARD P&C MASTER FUND LIMITED
.................................................................................
2.       Check the Appropriate Box if a Member of a Group

          (a) [  ]

          (b) [  ]
.................................................................................
3.       SEC Use Only

.................................................................................
4.       Source of Funds (See Instructions)

         WC
.................................................................................
5.       Check if Disclosure of Legal Proceedings is Required Pursuant to
         Items 2(d) or 2(e)

         [ ]
.................................................................................

6.       Citizenship or Place of Organization

         CAYMAN ISLANDS
.................................................................................

Number of       7.     Sole Voting Power                  None
Shares
Beneficially    ................................................................
Owned by Each
Reporting       8.     Shared Voting Power                4,493,045
Person With     ................................................................

                9.     Sole Dispositive Power             None
                ................................................................

                10.    Shared Dispositive Power           4,493,045
.................................................................................

11.      Aggregate Amount Beneficially Owned by Each Reporting Person

         4,493,045
.................................................................................

12.      Check if the Aggregate Amount in Row (9) Excludes Certain Shares (See
         Instructions)

         |_|
.................................................................................

13.      Percent of Class Represented by Amount in Row (9)

         6.41% based on 70,107,240 shares outstanding as of August 1, 2007.
.................................................................................

14.      Type of Reporting Person:

         OO



                                  SCHEDULE 13G

CUSIP No.: G7313F106                                         Page 5 of 12 Pages

.................................................................................
1.       Names of Reporting Persons.

         I.R.S. Identification Nos. of above persons (entities only).


         BRAD HUNTINGTON
.................................................................................
2.       Check the Appropriate Box if a Member of a Group

          (a) [  ]

          (b) [  ]
.................................................................................
3.       SEC Use Only

.................................................................................
4.       Source of Funds (See Instructions)

         WC
.................................................................................
5.       Check if Disclosure of Legal Proceedings is Required Pursuant to
         Items 2(d) or 2(e)

         [ ]
.................................................................................

6.       Citizenship or Place of Organization

         CANADA
.................................................................................

Number of       7.     Sole Voting Power                  None
Shares
Beneficially    ................................................................
Owned by Each
Reporting       8.     Shared Voting Power                4,493,045
Person With     ................................................................

                9.     Sole Dispositive Power             None
                ................................................................

                10.    Shared Dispositive Power           4,493,045
.................................................................................

11.      Aggregate Amount Beneficially Owned by Each Reporting Person

         4,493,045
.................................................................................

12.      Check if the Aggregate Amount in Row (9) Excludes Certain Shares (See
         Instructions)

         |_|
.................................................................................

13.      Percent of Class Represented by Amount in Row (9)

         6.41% based on 70,107,240 shares outstanding as of August 1, 2007.
.................................................................................

14.      Type of Reporting Person:

         IN




                                                              Page 6 of 12 Pages

            This  Statement on Schedule  13D relates to shares of Common  Stock,
par value $0.01 per share (the "Shares"),  of Quanta Capital Holdings Limited, a
Bermuda corporation (the "Company"):

Item 1.     Security and Issuer

            This Statement  relates to the Shares.  The address of the principal
executive office of the Issuer is Cumberland House, 1 Victoria Street, Hamilton,
Bermuda, HM 11.

Item 2.     Identity and Background

            This  Statement is filed on behalf of each of the following  persons
(collectively, the "Reporting Persons"):

            i)    Brevan Howard P&C Partners Limited ("BH P&C Partners");

            ii)   Armour Group Holdings Limited ("Armour");

            iii)  Brevan Howard P&C Master Fund Limited ("P&C Master Fund");

            iv)   Brad Huntington ("Mr. Huntington").

            This  Statement  relates to Shares (as defined  herein) held for the
account of Armour, a Cayman Islands exempted company.

                              The Reporting Persons

            BH P&C  Partners  is a Bermudan  limited  liability  company and its
principal office is located at 12 Bermudiana Road, 3rd Floor,  Hamiliton,  HMAX,
Bermuda.  The  principal  business  of BH  P&C  Partners  is  management  of the
investment activities of each of Armour, P&C Master Fund, Brevan Howard P&C Fund
Limited and Brevan  Howard P&C Fund,  L.P. BH P&C Partners  serves as investment
manager to Armour,  and in such capacity,  BH P&C Partners may be deemed to have
voting and  dispositive  power  over,  the Shares  held for such  accounts.  Mr.
Huntington is the Director of BH P&C Partners.

            The principal  occupation of Mr. Huntington,  a Canadian citizen, is
the direction of the activities of BH P&C Partners Limited, which is carried out
in his  capacity  as  Director of BH P&C  Partners  Limited at BH P&C  Partners'
principal office address.

            During the past five years,  none of the  Reporting  Persons and, to
the best of the  Reporting  Persons'  knowledge,  no other person  identified in
response to this Item 2 has been (a) convicted in a criminal proceeding or (b) a
party to any  civil  proceeding  as a result of which it has been  subject  to a
judgment,  decree or final order enjoining future  violations of, or prohibiting
or mandating activities subject to, federal or state securities laws, or finding
any violation with respect to such laws.

Item 3.     Source and Amount of Funds or Other Consideration

            The  Shares  covered  by this  Schedule  13D were  purchased  by the
Reporting Persons between August 31, 2007 and November 8, 2007 for approximately
$12,250,360.  The  source  of funds for the  purchases  was cash  available  for
investment held by the Reporting Persons.

Item 4.     Purpose of Transaction



                                                              Page 7 of 12 Pages

            All of the Shares  reported  herein  were  acquired  for  investment
purposes.  The Reporting  Persons review on a continuing basis the investment in
the Issuer.  Based on such review and depending on the price and availability of
the Issuer's  securities,  the  Reporting  Persons may  acquire,  or cause to be
acquired,   additional   securities  of  the  Issuer  or  derivatives  or  other
instruments  related  thereto,  in the open market or otherwise,  dispose of, or
cause to be disposed, such securities,  derivatives or instruments,  in the open
market  or  otherwise,  at any  time,  or  formulate  other  purposes,  plans or
proposals  regarding the Issuer or any of its  securities,  to the extent deemed
advisable in light of general  investment and trading  policies of the Fund, the
Issuer's business, financial condition and operating results, general market and
industry conditions or other factors.

            As part of the ongoing  evaluation of this investment and investment
alternatives,  the  Reporting  Persons  may  consider  transactions  of the type
described  in  subparagraphs  (a) through (j) of Item 4 of the  Instructions  to
Schedule 13D and,  subject to applicable  law, may formulate a plan with respect
to such matters. In addition,  from time to time, the reporting persons may hold
discussions  with or  make  formal  proposals  to  management  or the  board  of
directors of the Issuer, other stockholders of the Issuer or other third parties
regarding such matters.

Item 5.     Interest in Securities of the Issuer

            According to information filed by the Issuer with the Securities and
Exchange  Commission,  the number of Shares  outstanding  was  70,107,240  as of
August 1, 2007.

            (a)  Each  of BH P&C  Partners,  Armour,  P&C  Master  Fund  and Mr.
Huntington may be deemed the beneficial owner of 4,493,045 Shares (approximately
6.41% of the total number of Shares outstanding).

            (b) (i) BH P&C Partners may be deemed to have shared power to direct
the voting and  disposition  of the 4,493,045  Shares that they may be deemed to
beneficially own as set forth above.

                  (ii) Mr. Huntington,  Armour and P&C Master Fund may be deemed
to have  shared  power to direct  the voting and  disposition  of the  4,493,045
Shares  that BH P&C  Partners  may be  deemed to  beneficially  own as set forth
above.

            (c) Except  for the  transactions  listed on Annex A hereto,  all of
which were effected in the open market in routine brokerage transactions,  there
have been no  transactions  with  respect to the Shares since August 31, 2007 by
any of the Reporting Persons.

            (d) Not applicable.

            (e) Not applicable.

Item 6.     Contracts,   Arrangements,   Understandings  or  Relationships  with
            Respect to the Securities of the Issuer.

            Pursuant to Rule  13d-1(k)  promulgated  under the Exchange Act, the
Reporting Persons have entered into a Joint Filing Agreement  attached hereto as
Exhibit  A,  with  respect  to the  joint  filing  of the  Schedule  13D and any
amendment or amendments thereto.

            The  Reporting  Persons  may from time to time enter into and unwind
cash settled equity swaps, exchange traded or "over-the-counter" puts and calls,
warrants, forward purchase or sale transactions, future transactions, cap



                                                              Page 8 of 12 Pages

transactions,  floor  transactions,  collar  transactions,  or other  options or
derivative  or risk  management  transactions  with  respect to the Shares.  The
return on such  contracts  may be wholly or  partially  dependent  on the market
value of the Shares,  the relative  value of the Shares in  comparison to one or
more other  financial  instruments,  indexes,  securities,  baskets or groups of
securities  in which Shares may be  included,  currencies,  commodities,  bonds,
equity securities,  loans, interest rates,  catastrophe events,  weather-related
events,  credit-related  events  or  conditions  or any  index or other  similar
transaction  (including any option with respect to any of these transactions) or
any combination of these transactions with one or more counterparties.

            From time to time, to the extent  permitted by applicable  law, each
of the  Reporting  Persons  may borrow  securities,  including  Shares,  for the
purpose of effecting, and may effect, short sale transactions,  and may purchase
securities  for  the  purpose  of  closing  out  short  sale  positions  in such
securities.

            From time to time, each of the Reporting  Persons may lend portfolio
securities  to  brokers,  banks and other  financial  institutions.  These loans
typically obligate the borrower to return the securities,  or an equal amount of
securities  of the same  class,  to the lender and  typically  provide  that the
borrower is entitled to exercise  voting rights and to retain  dividends  during
the term of the loan.


Item 7.     Material to be filed as Exhibits.

            The Exhibit Index is incorporated herein by reference.



                                                              Page 9 of 12 Pages

                                    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 13, 2007             BREVAN HOWARD P&C PARTNERS LIMITED


                                    By:
                                         /s/ Brad Huntington
                                         --------------------------
                                    Name: Brad Huntington
                                    Title:   Director


Date: November 13, 2007             ARMOUR GROUP HOLDINGS LIMITED


                                    By:
                                         /s/ Brad Huntington
                                         --------------------------
                                    Name: Brad Huntington
                                    Title:   Director


Date: November 13, 2007             BREVAN HOWARD P&C MASTER FUND LIMITED


                                    By:
                                         /s/ Brad Huntington
                                         --------------------------
                                    Name: Brad Huntington
                                    Title:   Director


Date: November 13, 2007             BRAD HUNTINGTON


                                    By:
                                         /s/ Brad Huntington
                                         --------------------------
                                    Name: Brad Huntington



                                                             Page 10 of 12 Pages

                                     ANNEX A

                    RECENT TRANSACTIONS IN THE SECURITIES OF
                         QUANTA CAPITAL HOLDINGS LIMITED

A.  Transactions for the account of Brevan Howard P&C Partners  Limited,  Armour
Group  Holdings  Limited,  Brevan  Howard  P&C  Master  Fund  Limited  and  Brad
Huntington in the past 60 days:




----------------------------------------------------------------------------------------------------------
    Date of Transaction           Nature of Transaction         Number of Shares        Price per Share
----------------------------------------------------------------------------------------------------------
                                                                               
         08/31/2007                     PURCHASE                         2,794,745                  $2.74
----------------------------------------------------------------------------------------------------------
         09/17/2007                     PURCHASE                            41,200                  $2.68
----------------------------------------------------------------------------------------------------------
         09/19/2007                     PURCHASE                            53,500                  $2.73
----------------------------------------------------------------------------------------------------------
         09/25/2007                     PURCHASE                            31,000                  $2.73
----------------------------------------------------------------------------------------------------------
         09/27/2007                     PURCHASE                           200,000                  $2.83
----------------------------------------------------------------------------------------------------------
         09/28/2007                     PURCHASE                            62,000                  $2.73
----------------------------------------------------------------------------------------------------------
         10/01/2007                     PURCHASE                             4,000                  $2.73
----------------------------------------------------------------------------------------------------------
         10/02/2007                     PURCHASE                           113,100                  $2.72
----------------------------------------------------------------------------------------------------------
         10/03/2007                     PURCHASE                            10,000                  $2.72
----------------------------------------------------------------------------------------------------------
         10/04/2007                     PURCHASE                            50,000                  $2.70
----------------------------------------------------------------------------------------------------------
         10/05/2007                     PURCHASE                            36,000                  $2.69
----------------------------------------------------------------------------------------------------------
         10/16/2007                     PURCHASE                            17,500                  $2.68
----------------------------------------------------------------------------------------------------------
         10/18/2007                     PURCHASE                            10,000                  $2.68
----------------------------------------------------------------------------------------------------------
         10/25/2007                     PURCHASE                            20,000                  $2.68
----------------------------------------------------------------------------------------------------------
         10/30/2007                     PURCHASE                            15,000                  $2.68
----------------------------------------------------------------------------------------------------------
         10/31/2007                     PURCHASE                            15,000                  $2.68
----------------------------------------------------------------------------------------------------------
         11/01/2007                     PURCHASE                            25,000                  $2.68
----------------------------------------------------------------------------------------------------------
         11/02/2007                     PURCHASE                           735,000                  $2.67
----------------------------------------------------------------------------------------------------------
         11/05/2007                     PURCHASE                            10,000                  $2.68
----------------------------------------------------------------------------------------------------------
         11/07/2007                     PURCHASE                            30,000                  $2.68
----------------------------------------------------------------------------------------------------------
         11/08/2007                     PURCHASE                           220,000                  $2.72
----------------------------------------------------------------------------------------------------------




                                                             Page 11 of 12 Pages

                                  EXHIBIT INDEX


Ex.                                                                    Page No.
---                                                                    --------

A     Joint Filing Agreement, dated November 13, 2007 by and among
      Brevan Howard P&C Partners Limited, Armour Group Holdings
      Limited, Brevan Howard P&C Master Fund Limited and Brad
      Huntington...................................................       12



                                                             Page 12 of 12 Pages

                                    EXHIBIT A

                             JOINT FILING AGREEMENT

      The  undersigned  hereby  agree that the  statement  on Schedule  13D with
respect to the  Common  Stock of Quanta  Capital  Holdings  Limited  dated as of
November  13,  2007 is, and any  amendments  thereto  (including  amendments  on
Schedule  13G) signed by each of the  undersigned  shall be,  filed on behalf of
each of us pursuant to and in  accordance  with the  provisions of Rule 13d-1(k)
under the Securities Exchange Act of 1934, as amended.

Date: November 13, 2007              BREVAN HOWARD P&C PARTNERS LIMITED


                                     By:
                                           /s/ Brad Huntington
                                           -------------------------------
                                     Name: Brad Huntington
                                     Title:   Director


Date: November 13, 2007              ARMOUR GROUP HOLDINGS LIMITED


                                     By:
                                           /s/ Brad Huntington
                                           -------------------------------
                                     Name: Brad Huntington
                                     Title:   Director


Date: November 13, 2007              BREVAN HOWARD P&C MASTER FUND LIMITED


                                     By:
                                           /s/ Brad Huntington
                                           -------------------------------
                                     Name: Brad Huntington
                                     Title:   Director


Date: November 13, 2007              BRAD HUNTINGTON


                                     By:
                                           /s/ Brad Huntington
                                           -------------------------------
                                     Name: Brad Huntington