Unassociated Document

Exhibit 32.1

CERTIFICATION PURSUANT TO

18 U.S.C. SECTION 1350,

AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES−OXLEY ACT OF 2002

In connection with the amended Annual Report of ThermoEnergy Corporation (the “Company”) on Form 10−KSB/A for the period ended December 31, 2007, as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, Dennis C. Cossey, Chief Executive Officer of the Company, certify, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes−Oxley Act of 2002, that to the best of my knowledge:

(1) The Report fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934, as amended; and

(2) The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

/s/ Dennis C. Cossey

Dennis C. Cossey

Chief ExecutiveOfficer

April 23, 2008

A signed original of this written statement required by Section 906 has been provided to the registrant and will be retained by the registrant and furnished to the Securities and Exchange Commission or its staff upon request. This certification accompanies the Company’s Annual Report on Form 10−KSB pursuant to Section 906 of the Sarbanes Oxley Act of 2002 and shall not, except to the extent required by such Act, be deemed filed by the Company for purposes of Section 18 of the Exchange Act. Such certification will not be deemed to be incorporated by reference into any filing under the Securities Act of 1933, as amended, or the Exchange Act, except to the LIVEDGAR® Information Provided by Global Securities Information, Inc.