<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0305</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2012-04-11</periodOfReport>

    <issuer>
        <issuerCik>0001307579</issuerCik>
        <issuerName>LIQTECH INTERNATIONAL INC</issuerName>
        <issuerTradingSymbol>LIQT</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001528433</rptOwnerCik>
            <rptOwnerName>SONNELAND MICHAEL</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>NAERUMVAENGE TORV 18</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>NAERUM</rptOwnerCity>
            <rptOwnerState>G7</rptOwnerState>
            <rptOwnerZipCode>2850</rptOwnerZipCode>
            <rptOwnerStateDescription>DENMARK</rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2012-04-11</value>
            </transactionDate>
            <deemedExecutionDate>
                <value>2012-04-11</value>
            </deemedExecutionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>P</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>41989</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>2.125</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>539239</value>
                    <footnoteId id="F1"/>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>See footnote</value>
                    <footnoteId id="F2"/>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <footnotes>
        <footnote id="F1">Represents 519,239 shares beneficially owned by NSMSO Holding ApS, a Danish entity which is 100% owned and controlled by the Reporting Person, and 20,000 stock options directly held by the Reporting Person, which vest in three equal annual installments on December 16, 2011, September 1, 2012 and September 1, 2013.</footnote>
        <footnote id="F2">On April 11, 2012, NSMSO Holding ApS, a company which is 100% owned and controlled by the Reporting Person, purchased 41,989 shares from a non-US person in a private transaction at a price of $2.125 per share.</footnote>
    </footnotes>

    <ownerSignature>
        <signatureName>/s/ Michael Sonneland</signatureName>
        <signatureDate>2012-04-12</signatureDate>
    </ownerSignature>
</ownershipDocument>
