Document:

THIS NOTE AND THE SHARES
OF COMMON STOCK ISSUABLE UPON CONVERSION OF THIS NOTE HAVE NOT BEEN REGISTERED UNDER THE SECURITIES ACT OF 1933, AS AMENDED, OR
ANY STATE SECURITIES LAWS. NEITHER THIS NOTE NOR SUCH SHARES OF COMMON STOCK MAY BE SOLD, OFFERED FOR SALE, PLEDGED OR HYPOTHECATED
IN THE ABSENCE OF AN EFFECTIVE REGISTRATION STATEMENT UNDER SUCH SECURITIES ACT AND ANY APPLICABLE STATE SECURITIES LAW OR AN OPINION
OF COUNSEL REASONABLY SATISFACTORY TO THE ISSUING CORPORATION THAT SUCH REGISTRATION IS NOT REQUIRED.

 

ThermoEnergy
Corporation

 

	$1,877,217.12 	April 1, 2012

 

AMENDED AND RESTATED

CONVERTIBLE PROMISSORY NOTE DUE MARCH
31, 2014

 

FOR VALUE RECEIVED,
ThermoEnergy Corporation, a Delaware corporation (the “Borrower”), hereby promise to pay to the order of The Roenigk
Family Trust dated November 10, 2004 (the “Holder”), the sum of One Million, Eight Hundred Seventy-Seven Thousand,
Two Hundred Seventeen Dollars and Twelve Cents ($1,877,217.12), on March 31, 2014 (the “Maturity Date”).

 

This Note has been
issued in replacement for a series of notes issued pursuant to the terms of a Securities Purchase Agreement between the Borrower
and Martin A. Roenigk, dated as of March 21, 2007 (the “Purchase Agreement”) and is subject to the provisions of, and
entitled to the benefits of, the Purchase Agreement.

 

Interest on the outstanding
principal balance of this Note shall accrue (i) at the rate of five percent (5%) per annum during the period beginning on April
1, 2012 and ending on May 31, 2012 and (ii) at the rate of eight percent (8%) per annum during the period beginning on June 1,
2012 and ending on the Maturity Date. Interest shall be payable semi-annually on the last day of September and March of each year.
Interest shall be computed on the basis of a 360-day year, using the number of days actually elapsed. Any scheduled interest payment
may, at the election of the Borrower by written notice to the Holder (a “Deferral Notice”) and payment to the Holder
of a deferral fee in the amount of $5,000.00 (the “Deferral Fee”) no later than five business days after the date on
which such interest payment was due, be deferred until the Maturity Date. The amount of any interest so deferred shall, effective
as of the date on which such interest payment was originally due, be added to the principal amount of this Note.

 

The Holder shall have
the right at any time and from time to time until the principal and interest on this Note shall have been paid in full, to convert
the principal and any interest due under this Note into shares of the Borrower’s Common Stock, par value $0.001 per share
(the “Common Stock”).If the Holder exercises its right of conversion, the Holder shall give the Borrower a Notice of
Conversion in the form annexed to this Note, setting forth the amount of principal and interest which the Holder is converting
into Common Stock (the “Conversion Amount”) at the Conversion Price in effect on the date of such notice. The date
of such notice is referred to as the Conversion Date. Upon delivery to the Borrower of a completed Notice of Conversion, the Borrower
shall deliver, within five (5) business days after the Conversion Date (such fifth day being the “Delivery Date”),
irrevocable instructions to the transfer agent for the Common Stock to issue and delivery to the Holder a certificate for that
number of shares of Common Stock into which the Conversion Amount is being converted. Except to the extent that the unpaid principal
balance of this Note is being presented for conversion, the Holder shall not be required to present this Note in order to effect
conversion, and the Holder shall maintain a ledger setting forth each conversion of principal and interest on this Note and such
ledger shall, absent manifest error, be deemed to be binding and conclusive on the Borrower.

 

    	 

    	 

    

 

1.1.         Conversion
Price. The Conversion Price shall be $0.50 per share of Common Stock, subject to adjustment as set forth in Section 1.2
of this Note. The number of shares of Common Stock to be issued upon each conversion of this Note shall be determined by dividing
the Conversion Amount by the Conversion Price in effect on the Conversion Date.

 

1.2.         Adjustment
to the Conversion Price. The Conversion Price and number and kind of shares or other securities to be issued upon conversion
shall be subject to adjustment from time to time upon the happening of certain events while this conversion right remains outstanding,
as follows:

 

1.2.1.     Stock
Dividends, Subdivisions and Combinations. If the Borrower shall at any time:

 

(a)          declare
or pay to the holders of its Common Stock a dividend payable in, or other distribution of, shares of Common Stock or in securities
convertible into shares of Common Stock (“Convertible Securities”); or

 

(b)          subdivide
its outstanding shares of Common Stock into a larger number of shares of Common Stock; or

 

(c)          combine
its outstanding shares of Common Stock into a smaller number of shares of Common Stock;

 

then (i) the number of shares of Common
Stock into which this Note is convertible immediately after the occurrence of any such event shall be adjusted to equal the number
of shares of Common Stock which a record holder of the same number of shares of Common Stock into which this Note is convertible
immediately prior to the occurrence of such event would own or be entitled to receive after the occurrence of such event, and (ii)
the then-current Conversion Price shall be adjusted to equal (A) the then-current Conversion Price multiplied by the number of
shares of Common Stock into which this Note is convertible immediately prior to the adjustment divided by (B) the number of shares
into which this Note is convertible immediately after such adjustment.

 

1.2.2.     Certain
Other Distributions. If at any time the Borrowers shall declare or pay to the holders of its Common Stock any dividend or other
distribution of:

 

(a)          cash;

 

(b)          any
evidences of its indebtedness, any shares of its stock or any other securities or property of any nature whatsoever (other than
cash, Convertible Securities or additional shares of Common Stock); or

 

(c)          any
warrants or other rights to subscribe for or purchase any evidences of its indebtedness, any shares of its stock or any other securities
or property of any nature whatsoever (other than cash, Convertible Securities or additional shares of Common Stock);

 

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then, upon conversion of this Note, the
Holder shall be entitled to receive such dividend or distribution as if the Holder had converted the Conversion Amount prior to
the date of such dividend or distribution. A reclassification of the Common Stock (other than a change in par value, or from par
value to no par value or from no par value to par value) into shares of Common Stock and shares of any other class of stock shall
be deemed a distribution by the Company to the holders of its Common Stock of such shares of such other class of stock within the
meaning of this Section 1.2.1 and, if the outstanding shares of Common Stock shall be changed into a larger or smaller number of
shares of Common Stock as a part of such reclassification, such change shall be deemed a subdivision or combination, as the case
may be, of the outstanding shares of Common Stock within the meaning of Section 1.2.1.

 

1.2.3      Reorganization,
Reclassification, Merger, Consolidation or Disposition of Assets. In case the Borrower shall reorganize its capital, reclassify
its capital stock, consolidate or merge with or into another Person (where the Borrower is not the survivor or where there is a
change in or distribution with respect to the Common Stock), or sell, convey, transfer or otherwise dispose of all or substantially
all its property, assets or business to another Person, or effectuate a transaction or series of related transactions in which
more than 50% of the voting power of the Borrower is disposed of (each, a “Fundamental Corporate Change”) and, pursuant
to the terms of such Fundamental Corporate Change, shares of common stock of the successor or acquiring corporation, or any cash,
shares of stock or other securities or property of any nature whatsoever (including warrants or other subscription or purchase
rights) in addition to or in lieu of common stock of the successor or acquiring corporation (“Other Property”), are
to be received by or distributed to the holders of Common Stock, then the Holder shall have the right thereafter to receive, upon
conversion of this Note, such number of shares of common stock of the successor or acquiring corporation or of the Borrower, if
it is the surviving corporation, and Other Property as is receivable upon or as a result of such Fundamental Corporate Change
by a holder of the number of shares of Common Stock into which this Note is convertible immediately prior to such Fundamental Corporate
Change. In case of any such Fundamental Corporate Change, the successor or acquiring corporation (if other than the Borrower) shall
expressly assume the due and punctual observance and performance of each and every covenant and condition of this Note to be performed
and observed by the Borrower and all the obligations and liabilities hereunder, subject to such modifications as may be deemed
appropriate (as determined by resolution of the Board of Directors of the Borrower) in order to provide for adjustments of shares
of Common Stock into which this Note is convertible which shall be as nearly equivalent as practicable to the adjustments provided
for in this Section 1.2. For purposes of this Section 1.2.3, “common stock of the successor or acquiring corporation”
shall include stock of such corporation of any class which is not preferred as to dividends or assets over any other class of stock
of such corporation and which is not subject to redemption and shall also include any evidences of indebtedness, shares of stock
or other securities which are convertible into or exchangeable for any such stock, either immediately or upon a specified date
or upon the happening of a specified event, and any warrants or other rights to subscribe for or purchase any such stock. The foregoing
provisions of this Section 1.2 shall similarly apply to any successive Fundamental Corporate Change of the successor corporation.

 

1.2.4      Other
Action Affecting Common Stock. In case at any time or from time to time the Borrower shall take any action in respect of the
Common Stock, other than any action described in this Section 1.2, which would have a materially adverse effect upon the rights
of the Holder, the number of shares of Common Stock into which this Note is convertible and/or the Conversion Price shall be adjusted
in such manner as may be equitable in the circumstances, as determined in good faith by the Board of Directors of the Borrower.

 

1.2.5      Certain
Limitations. Notwithstanding anything herein to the contrary, the Borrower agrees not to enter into any transaction which,
by reason of any adjustment hereunder, would cause the Conversion Price to be less than the par value per share of Common Stock.

 

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1.3.         Notice
of Adjustment. Whenever the Conversion Price is adjusted pursuant to Section 1.2 of this Note, the Borrower shall promptly
mail to the Holder a notice setting forth the Conversion Price after such adjustment and setting forth a statement of the facts
requiring such adjustment.

 

1.4.         Mechanics
of Conversion.

 

1.4.1.     Delivery
of Certificate Upon Conversion. Except as otherwise set forth herein, not later than the Delivery Date, the Borrower shall
deliver to the Holder (a) a certificate or certificates representing the number of shares of Common Stock being acquired upon the
conversion of the Note (which certificate or certificates shall bear a legend indicating that such shares have been issued in reliance
on an exemption from the registration requirements of the Securities Act of 1933 (the “Securities Act” and may not
be sold, transferred or otherwise disposed of except pursuant to an effective registration statement under the Securities Act or
in reliance on an exemption to the registration requirements of the Securities Act), and (b) a bank check in the amount of accrued
and unpaid interest on the portion of the Note being converted unless the Holder converts such interest into Common Stock. If in
the case of any Notice of Conversion such certificate or certificates are not delivered to or as directed by the applicable Holder
by the Delivery Date, the Holder shall be entitled to elect by written notice to the Borrower at any time on or before its receipt
of such certificate or certificates thereafter, to rescind such conversion, in which event the conversion shall be deemed void
ab initio.

 

1.4.2.     Obligation
Absolute. The Borrower’s obligations to issue and deliver the Common Stock upon conversion of this Note in accordance
with the terms hereof are absolute and unconditional, irrespective of any action or inaction by the Holder to enforce the same,
any waiver or consent with respect to any provision hereof, the recovery of any judgment against any Person or any action to enforce
the same, or any setoff, counterclaim, recoupment, limitation or termination, or any breach or alleged breach by the Holder or
any other Person of any obligation to the Borrower or any violation or alleged violation of law by the Holder or any other Person,
and irrespective of any other circumstance which might otherwise limit such obligation of the Borrower to the Holder in connection
with the issuance of such shares. In the event the Holder shall elect to convert any or all of this Note, The Borrower may not
refuse conversion based on any claim that such Holder or anyone associated or affiliated with the Holder of has been engaged in
any violation of law, agreement or for any other reason unless an injunction from a court, on notice, restraining and or enjoining
conversion of all or part of this Note shall have been sought and obtained. In the absence of an injunction precluding the same,
the Borrower shall issue the Common Stock or, if applicable, cash, upon a properly noticed conversion.

 

1.4.3.     Fractional
Shares. Upon a conversion hereunder, the Borrower shall not be required to issue stock certificates representing fractions
of shares of the Common Stock. All fractional shares shall be carried forward and any fractional shares which remain after a Holder
converts all of this Note shall be rounded up to the next whole number of shares.

 

1.4.4.     Transfer
Taxes. The issuance of certificates for shares of the Common Stock on conversion of this Note shall be made without charge
to the Holder thereof for any documentary stamp or similar taxes that may be payable in respect of the issue or delivery of such
certificate, provided that the Borrower shall not be required to pay any tax that may be payable in respect of any transfer involved
in the issuance and delivery of any such certificate upon conversion in a name other than that of the Holder of this Note and the
Borrower shall not be required to issue or deliver such certificates unless or until the person or persons requesting the issuance
thereof shall have paid to the Borrower the amount of such tax or shall have established to the satisfaction of the Borrower that
such tax has been paid.

 

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Section 2.              Events
of Default.

 

2.1.          The
entire unpaid principal amount of this Note, together with interest thereon shall, on written notice from the Holder, forthwith
become and be due and payable if any one or more Events of Default shall have occurred (for any reason whatsoever and whether such
happening shall be voluntary or involuntary or be affected or come about by operation of law pursuant to or in compliance with
any judgment, decree or order of any court or any order, rule or regulation of any administrative or governmental body) and be
continuing.

 

2.2.          The
occurrence of any one or more of the following events or conditions shall constitute an “Event of Default” under
this Agreement:

 

2.2.1.     Borrower’s
failure to make any payment of principal or interest or any other sums within fifteen (15) days of the date when due on this Note,
unless the Borrower timely gives a Deferral Notice and pays the required Deferral Fee with respect to such payment; or

 

2.2.2.     Any
representation or warranty or other statement made or furnished by or on behalf of the Borrower in the Purchase Agreement or in
any document or instrument furnished in connection with the Purchase Agreement proves to have been false or misleading in any material
respect when made or furnished; or

 

2.2.3.     Breach
of or failure in the due observance or performance in any material respect of any covenant, condition or agreement on the part
of the Borrower to be observed or performed pursuant to the Purchase Agreement and the failure to cure (if curable) any such breach
or failure within fifteen (15) days after receipt of written notice thereof from the Holder; or

 

2.2.4.     If
the Borrower shall (a) apply for or consent to the appointment of a receiver, trustee or liquidator of all or a substantial part
of any of its assets; (b) be unable, or admit in writing its inability, to pay its debts as they mature; (c) file or permit the
filing of any petition, case arrangement, reorganization, or the like under any insolvency or bankruptcy law, or the adjudication
of it as a bankrupt, or the making of an assignment for the benefit of creditors or the consenting to any form or arrangement for
the satisfaction, settlement or delay of debt or the appointment of a receiver for all or any part of its properties; or (d) any
action shall be taken by the Borrower for the purpose of effecting any of the foregoing; or

 

2.2.5.     If
an order, judgment or decree shall be entered, or a case shall be commenced, against the Borrower, without its application, approval
or consent by any court of competent jurisdiction, approving a petition or permitting the commencement of a case seeking reorganization
or liquidation of the Borrower or appointing a receiver, trustee or liquidator of the Borrower, or of all or a substantial part
of the assets of the Borrower, and the Borrower, by any act, indicate its approval thereof, consent thereto, or acquiescence therein,
or such order, judgment, decree or case shall continue unstayed and in effect for any period of 90 consecutive days or an order
for relief in connection therewith shall be entered; or

 

2.2.6.     If
the Borrower shall dissolve or liquidate, or be dissolved or liquidated, or cease to legally exist, or merge or consolidate, or
be merged or consolidated with or into any other corporation.

 

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Section 3.             Miscellaneous

 

3.1.          Usury
Saving Provision. All payment obligations arising under this Note are subject to the express condition that at no time
shall the Borrower be obligated or required to pay interest at a rate which could subject the Holder to either civil or criminal
liability as a result of being in excess of the maximum rate which the Borrower is permitted by law to contract or agree to pay.
If by the terms of this Note, the Borrower is at any time required or obligated to pay interest at a rate in excess of such maximum
rate, the applicable rate of interest shall be deemed to be immediately reduced to such maximum rate, and interest thus payable
shall be computed at such maximum rate, and the portion of all prior interest payments in excess of such maximum rate shall be
applied and shall be deemed to have been payments in reduction of principal.

 

3.2.          Failure
or Indulgence Not Waiver. No failure or delay on the part of the Holder hereof in the exercise of any power, right or privilege
hereunder shall operate as a waiver thereof, nor shall any single or partial exercise of any such power, right or privilege preclude
other or further exercise thereof or of any other right, power or privilege. All rights and remedies existing hereunder are cumulative
to, and not exclusive of, any rights or remedies otherwise available.

 

3.3.          Governing
Law. This Agreement and the rights of the parties shall be construed and enforced in accordance with the laws of the State
of Arkansas applicable to agreements executed and to be performed wholly within such state and without regard to principles of
conflicts of law. Each party irrevocably (a) consents to the jurisdiction of the federal and state courts situated in Pulaski County,
Arkansas in any action that may be brought pursuant to this Agreement, and (b) submits to and accepts, with respect to its properties
and assets, generally and unconditionally, the in personam jurisdiction of the aforesaid courts, waiving any defense that such
court is not a convenient forum. In any such litigation to the extent permitted by applicable law, each party waives personal service
of any summons, complaint or other process, and agrees that the service thereof may be made either (i) in the manner for giving
of notices provided in Section 3.5 of this Note (other than by facsimile) or (ii) in any other manner permitted by law.

 

3.4.          Waiver
of Right to Trial by Jury. BORROWER HEREBY KNOWINGLY, VOLUNTARILY AND INTENTIONALLY WAIVES THE RIGHT TO A TRIAL BY JURY
IN RESPECT OF ANY CLAIM BASED HEREON, ARISING OUT OF, UNDER OR IN CONNECTION WITH THIS NOTE AND WAIVE ANY RIGHT TO BRING A COUNTERCLAIM
AGAINST THE HOLDER IN ANY ACTION TO ENFORCE THIS NOTE. THIS WAIVER CONSTITUTES A MATERIAL INDUCEMENT FOR HOLDER TO ACCEPT THIS
NOTE.

 

3.5.          Notice.
All notices, requests or other communications required or permitted to be given under this Agreement to any party shall be in writing
and shall be deemed to have been sufficiently given when delivered by personal service or sent by registered mail, overnight courier
services with provided evidence of delivery or attempted delivery, or by facsimile, to the Borrower at 10 New Bond Street, Worcester,
Massachusetts 01606 (fax: 508-854-1753) or to the Holder at 75 Prospect Avenue, Eureka Springs, Arkansas 72632 (fax: 479-253-0406).
Either party may, be like notice, change the address or telecopy number or the person to whom notice is to be given. Notice shall
be deemed given when received or when attempted delivery is made (based on evidence of attempted delivery by the United States
Postal Service or an overnight courier or a messenger service), provided that notice by facsimile shall be deemed given when receipt
is acknowledged by the recipient.

 

3.6.          Amendment.
The term “Note” and all reference thereto, as used throughout this instrument, shall mean this instrument as originally
executed, or if later amended or supplemented, then as so amended or supplemented..

 

3.7.          Assignability.
This Note shall be binding upon the Borrower and its successors and assigns, and shall inure to the benefit of the Holder and its
successors and assigns. The Borrower may not assign any of its obligations under this Note without the consent of the Holder.

 

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3.8.          Cost
of Collection. If default is made in the payment of this Note, the Borrower shall pay the Holder hereof reasonable costs
of collection, including reasonable attorneys’ fees, regardless of whether the Holder commenced litigation in order to enforce
its rights under this Note.

 

3.9.          Stockholder
Status. The Holder shall not have rights as a stockholder of the Borrower with respect to unconverted portions of this
Note. However, from and after the Conversion Date, the Holder will have all the rights of a shareholder of the Borrower with respect
to the shares of Common Stock to be received by the Holder after delivery by the Holder of a Conversion Notice to the Borrower
regardless of whether physical certificates shall have been delivered.

 

IN WITNESS WHEREOF,
the parties have caused this Agreement to be duly executed and delivered by the proper and duly authorized officers as of the
date and year first above written.

 

	 	ThermoEnergy Corporation
	 	 
	 	By:	/s/  Teodor
    Klowan, Jr.
	 	 	Teodor Klowan, Jr. CPA
	 	 	Executive Vice President and CFO

 

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NOTICE OF CONVERSION

 

(To be executed by the Holder in order to convert the Note)

 

The undersigned hereby elects to convert
$_________ of the principal and $_________ of the interest due on the Note issued by ThermoEnergy Corporation as of April 1, 2012
into shares of Common Stock of ThermoEnergy Corporation according to the conditions set forth in such Note, as of the date written
below.

 

Date of Conversion:__________________________________

 

Conversion Price:____________________________________

 

Number of Shares To Be Delivered:_______________________________

 

Signature:________________________________________

 

Print Name and Title:_____________________________________________________________

 

Address:________________________________________________________________________

 

_______________________________________________________________________ThermoEnergy
Corporation

 

Bridge
Loan Agreement

 

This Agreement is made by and among ThermoEnergy
Corporation, a Delaware corporation (the “Corporation”) and the individual and entities identified on Schedule I hereto
(each, an “Investor”) this 2nd day of December 2011.

 

Whereas, the Board of Directors of the Corporation
has proposed the designation and issuance of a new series of the Corporation’s authorized Preferred Stock (the “New
Preferred Stock”) on substantially the terms set forth in the Term Sheet attached hereto as Exhibit A (the “Term Sheet”);
and

 

Whereas, the Corporation may not issue or
sell the New Preferred Stock unless the holders of the Corporation’s Series B Convertible Preferred Stock (the “Series
B Stock”) consent thereto and waive the application of the anti-dilution adjustment to the conversion price of the Series
B Stock as set forth in the Corporation’s Certificate of Incorporation, as amended; and

 

Whereas, in anticipation of the designation
and issuance of the New Preferred Stock, each of the Investors is willing to make a loan to the Corporation in the principal amount
set forth opposite the name of such Investor on Schedule I hereto;

 

Now, therefore, in consideration of the
foregoing and for other good and valuable consideration, the receipt and adequacy of which are hereby acknowledged, the Corporation
and the Investors hereby agree as follows:

 

1.          Bridge
Loans. Until the designation and issuance of the New Preferred Stock, each of the Investors hereby agrees to make a loan to
the Corporation in the principal amount set forth opposite the name of such Investor on Schedule I hereto (each, a “Bridge
Loan”). The Bridge Loans shall be evidenced by Promissory Notes in substantially the form attached hereto as Exhibit B (the
“Bridge Notes”).

 

2.          Representations
and Warranties of the Corporation. The Corporation hereby represents and warrants to the Investors as follows:

 

		(a)	Organization and Qualification. The Corporation is duly incorporated, validly existing and in good standing under
the laws of the State of Delaware, with the requisite power and authority to own and use its properties and assets and to carry
on its business as currently conducted. The Corporation is not in violation of any of the provisions of its Certificate of Incorporation
or By-Laws. The Corporation is duly qualified to conduct its business and is in good standing as a foreign corporation in each
jurisdiction in which the nature of the business conducted or property owned by it makes such qualification necessary, except where
the failure to be so qualified or in good standing, as the case may be, would not, individually or in the aggregate, have or reasonably
be expected to result in a Material Adverse Effect, and no proceedings have been instituted in any such jurisdiction revoking,
limiting or curtailing, or seeking to revoke, such power and authority or qualification. For purposes of this Agreement, the term
“Material Adverse Effect” shall mean any of (i) a material and adverse effect on the legality, validity or enforceability
of any of this Agreement or the Bridge Notes (collectively, the “Transaction Documents”), (ii) a material and adverse
effect on the results of operations, assets, prospects, business or condition (financial or otherwise) of the Corporation, or (iii)
a material impairment of the Corporation’s ability to perform on a timely basis its obligations under any Transaction Document.

 

    	 

    	 

    

 

		(b)	Authorization; Enforcement. The Corporation has the requisite corporate power and authority to enter into and to consummate
the transactions contemplated by each of the Transaction Documents and otherwise to carry out its obligations thereunder. The execution
and delivery of each of the Transaction Documents by the Corporation and the consummation by the Corporation of the transactions
contemplated thereby have been duly authorized by all necessary action on the part of the Corporation and no further action is
required by the Corporation in connection therewith. Each Transaction Document has been (or upon delivery will have been) duly
executed by the Corporation and, when delivered in accordance with the terms hereof, will constitute the valid and binding obligation
of the Corporation enforceable against the Corporation in accordance with its terms, except as such enforceability may be limited
by applicable bankruptcy, insolvency, reorganization, moratorium, liquidation or similar laws relating to, or affecting generally
the enforcement of, creditors’ rights and remedies or by other equitable principles of general application.

 

		(c)	No Conflicts. The execution, delivery and performance of the Transaction Documents by the Corporation and the
consummation by the Corporation of the transactions contemplated thereby do not and will not (i) conflict with or violate any provision
of the Borrower’s Certificate of Incorporation or By-Laws, or (ii) conflict with, or constitute a default (or an event that
with notice or lapse of time or both would become a default) under, or give to others any rights of termination, amendment, acceleration
or cancellation (with or without notice, lapse of time or both) of, or result in the imposition of any lien upon any of the material
properties or assets of the Corporation pursuant to, any agreement, credit facility, debt or other instrument or other understanding
to which the Corporation is a party or by which any property or asset of the Corporation is bound or affected, or (iii) result
in a violation of any law, rule, regulation, order, judgment, injunction, decree or other restriction of any court or governmental
authority to which the Corporation is subject (including federal and state securities laws and regulations), or by which any property
or asset of the Corporation is bound or affected; except in the case of each of clauses (ii) and (iii), such as could not, individually
or in the aggregate, have or reasonably be expected to result in a Material Adverse Effect.

 

		(d)	Issuance of the Bridge Notes. The Bridge Notes have been duly authorized. Each Bridge Note, when issued in accordance
with this Agreement, will be duly and validly issued.

 

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		(e)	SEC Reports; Financial Statements. The Corporation has filed all reports required to be filed by it under the Securities
Act of 1933 (the “Securities Act”) and the Exchange Act for the twelve months preceding the date of this Agreement
(the foregoing materials, being collectively referred to herein as the “SEC Reports”). As of their respective
dates, the SEC Reports complied in all material respects with the requirements of the Securities Act and the Exchange Act and the
rules and regulations of the Securities and Exchange Commission promulgated thereunder, and none of the SEC Reports, when filed,
contained any untrue statement of a material fact or omitted to state a material fact required to be stated therein or necessary
in order to make the statements therein, in light of the circumstances under which they were made, not misleading. The financial
statements of the Corporation included in the SEC Reports comply in all material respects with applicable accounting requirements
and the rules and regulations of the Securities and Exchange Commission with respect thereto as in effect at the time of filing.
Such financial statements have been prepared in accordance with GAAP applied on a consistent basis during the periods involved,
except as may be otherwise specified in such financial statements or the notes thereto, and fairly present in all material respects
the financial position of the Corporation and its consolidated subsidiaries as of and for the dates thereof and the results of
operations and cash flows for the periods then ended, subject, in the case of unaudited statements, to normal, immaterial, year-end
audit adjustments.

 

		(f)	Brokerage Fees. No brokerage or finder’s fees or commissions are or will be payable by the Corporation
to any broker, financial advisor or consultant, finder, placement agent, investment banker, bank or other person with respect to
the transactions contemplated by any of the Transaction Documents. The Investors shall have no obligation with respect to any fees
or with respect to any claims (other than such fees or commissions owed by the Investors pursuant to written agreements executed
by the Investors which fees or commissions shall be the sole responsibility of the Investors) made by or on behalf of other persons
for fees that may be due in connection with the transactions contemplated by the Transaction Documents.

 

3.          Representations
and Warranties of the Investors. The Investors, severally and not jointly, hereby represent and warrant to the Corporation
as follows, with respect only to themselves and not the other Investors:

 

		(a)	Authority.  This Agreement has been duly executed by such Investor and constitutes the valid and legally binding
obligation of such Investor, enforceable against him or it in accordance with its terms, except as such enforceability may be limited
by applicable bankruptcy, insolvency, reorganization, moratorium, liquidation or similar laws relating to, or affecting generally
the enforcement of, creditors’ rights and remedies or by other equitable principles of general application.

 

		(b)	Accredited Investor Status. Such Investor is an “accredited investor” as defined in Rule 501(a) under the
Securities Act. Such Investor will acquire the Bridge Note to be issued to him or it pursuant hereto for his or its own account,
for investment purposes and not with a view toward resale or distribution.

 

4           Entire
Agreement. The Transaction Documents contain the entire understanding of the parties with respect to the subject matter hereof
and supersede all prior agreements, understandings, discussions and representations, oral or written, with respect to such matters.
No provision of any Transaction Document may be waived or amended except in a written instrument signed by the Corporation and
by Investors holding at least 662⁄3% of the principal amount of the then outstanding Bridge Notes. No waiver of any default
with respect to any provision, condition or requirement of any of the Transaction Documents shall be deemed to be a continuing
waiver in the future or a waiver of any subsequent default or a waiver of any other provision, condition or requirement of such
Transaction Document or of any other Transaction Document, nor shall any delay or omission of any party to exercise any right hereunder
in any manner impair the exercise of any such right. No consideration shall be offered or paid to any Investor to amend or consent
to a waiver or modification of any provision of any Transaction Document unless the same consideration is also offered to all Investors.

 

    	3

    	 

    

 

5.          Governing
Law and Jurisdiction. This Agreement and the rights of the parties hereunder shall be construed and enforced in accordance
with the laws of the Commonwealth of Massachusetts applicable to agreements executed and to be performed wholly within such state
and without regard to principles of conflicts of law. Each party irrevocably (a) consents to the jurisdiction of the federal and
state courts situated in or having jurisdiction over Boston, Massachusetts in any action that may be brought for the enforcement
of this Agreement, and (b) submits to and accepts, with respect to its properties and assets, generally and unconditionally, the
in personam jurisdiction of the aforesaid courts, waiving any defense that such court is not a convenient forum.

 

6.          Execution.
This Agreement may be executed in two or more counterparts, all of which when taken together shall be considered one and the same
agreement and shall become effective when counterparts have been signed by each party and delivered to the other parties, it being
understood that all parties need not sign the same counterpart. In the event that any signature is delivered by facsimile transmission,
such delivery shall create a valid and binding obligation of the party executing (or on whose behalf such signature is executed)
with the same force and effect as if such facsimile signature page were an original thereof, notwithstanding any subsequent failure
or refusal to deliver an original signed in ink.

 

7.          Severability.
If any provision of this Agreement is held to be invalid or unenforceable in any respect, the parties will attempt to agree upon
a valid and enforceable provision that is a reasonable substitute therefor, and upon so agreeing, shall incorporate such substitute
provision in this Agreement. f any provision of this Agreement is held to be invalid or unenforceable in any respect, the validity
and enforceability of the remaining terms and provisions of this Agreement shall not in any way be affected or impaired thereby.

 

[Signature Pages Follow]

 

    	4

    	 

    

 

ThermoEnergy
Corporation

 

Bridge Loan Agreement;

 

Corporation’s Signature Page

 

In witness whereof, the Corporation has
executed and delivered this Agreement as of the date and year first above written.

 

	 	ThermoEnergy Corporation
	 	 	 
	 	By: 	/s/  Cary G. Bullock
	 	 	Cary G. Bullock, President and CEO

  

    	5

    	 

    

 

ThermoEnergy
Corporation

 

Bridge Loan Agreement

 

Investor’s Signature Page

 

In witness whereof, the undersigned Investor
has executed and delivered this Agreement as of the date and year first above written.

  

	 	 
	 	 	Print Investor’s Name
	 	 	 
	 	By: 	 
	 	 	Authorized Signature
	 	 	 
	 	 
	 	 	Print Name and Title of Signatory

  

    	 

    	 

    

 

ThermoEnergy
Corporation

 

Bridge Loan Agreement

 

Schedule I

  

	Investor	 	Bridge Loan	 
	Robert S. Trump	 	$	750,000	 
	Empire Capital Partners, L.P.	 	 	255,500	 
	Empire Capital Partners, Ltd.	 	 	130,000	 
	Empire Capital Partners Enhanced Master Fund Ltd.	 	 	114,500

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