<PAGE>
                                                                   EXHIBIT 31.2


CERTIFICATIONS


          CERTIFICATION OF THE PRINCIPAL FINANCIAL OFFICER PURSUANT TO
                SECURITIES EXCHANGE ACT RULES 13A-14 AND 15D-14
                       AS ADOPTED PURSUANT TO SECTION 302
                       OF THE SARBANES-OXLEY ACT OF 2002


I, P.L. Montesi, certify that:

         1.       I have reviewed this quarterly report on Form 10-QSB of
         ThermoEnergy Corporation;

         2.       Based on my knowledge, this quarterly report does not contain
         any untrue statement of a material fact or omit to state a material
         fact necessary to make the statements made, in light of the
         circumstances under which such statements were made, not misleading
         with respect to the period covered by this quarterly report;

         3.       Based on my knowledge, the financial statements, and other
         financial information included in this quarterly report, fairly
         present in all material respects the financial condition, results of
         operations and cash flows of the registrant as of, and for, the
         periods presented in this quarterly report;

         4.       The registrant's other certifying officer and I are
         responsible for establishing and maintaining disclosure controls and
         procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e))
         for the registrant and have:

                  a)       designed such disclosure controls and procedures, or
                  caused such disclosure controls and procedures to be designed
                  under our supervision, to ensure that material information
                  relating to the registrant, including its consolidated
                  subsidiaries, is made known to us by others within those
                  entities, particularly during the period in which this
                  quarterly report is being prepared;

                  b)       evaluated the effectiveness of the registrant's
                  disclosure controls and procedures and presented in this
                  quarterly report our conclusions about the effectiveness of
                  the disclosure controls and procedures, as of the end of the
                  period covered by this quarterly report based on such
                  evaluation; and

                  c)       disclosed in this quarterly report any change in the
                  registrant's internal control over financial reporting that
                  occurred during the registrant's most recent fiscal quarter
                  (the registrant's forth quarter in the case of an annual
                  report) that has materially affected or is reasonably likely
                  to materially affect, the registrant's internal control over
                  financial reporting; and

         5.       The registrant's other certifying officer and I have
         disclosed, based on our most recent evaluation of internal control
         over financial reporting, to the registrant's auditors and the audit
         committee of registrant's board of directors (or persons performing
         the equivalent functions):

                  a)       all significant deficiencies in the design or
                  operation of internal control which are reasonably likely to
                  adversely affect the registrant's ability to record, process,
                  summarize and report information; and

                  b)       any fraud, whether or not material, that involves
                  management or other employees who have a significant role in
                  the registrant's internal control over financial reporting.


Date:  August 19, 2003

                                                /s/ P.L. Montesi
                                                -------------------------------
                                                P.L. Montesi
                                                Principal Financial Officer