PHYTOREMEDIATION OF DANUBE WATER, AS A SUPPLY SOURCE FOR A RECIRCULATING AQUACULTURE SYSTEM, THROUGH THE USE OF LEMNA MINOR

M.D. Popa, Elena Mocanu, Viorica Savin

Abstract
   In order to use the Danube water as a supply source for a recirculating system, an attempt was made to use L. minor for phytoremediation by bioaccumulation of lead, a heavy metal that is toxic to aquatic life. The experiment was designed to achieve a gradient of concentrations to determine the most effective conditions for removing lead. In the first experimental variant, the Danube water was used undiluted as a growth medium, in the second experimental variant the Danube water represented 75% of the growth medium and in the last experimental variant the Danube water represented 50% of the growth medium, the experiment being performed in triplicate. The best percentage of lead removal was achieved in the aquarium with 100% Danube water, obtaining a reduction of lead in the water volume by 97.86±0.1%. The species L. minor can be used successfully for phytoremediation of Danube water, in order to use it as a water source for a recirculating aquaculture system.

FITOREMEDIEREA APEI DE DUNĂRE, CA SURSĂ DE ALIMENTARE PENTRU UN SISTEM RECIRCULANT DIN ACVACULTURĂ, PRIN FOLOSIREA SPECIEI LEMNA MINOR

M.D. Popa, Elena Mocanu1, Viorica Savin

Rezumat
   Pentru a folosi apa de Dunarea ca sursa de alimentare a unui sistem recirculant in care se cultiva crapul vara I, s-a incercat folosirea speciei L. minor pentru fitoremedierea prin bioacumulare a plumbului, un metal greu ce prezinta toxicitate pentru vietuitoarele acvatice. Experimentul a fost gandit astfel incat sa se realizeze un gradient de concentratii pentru a determinat cele mai eficiente conditii de indepartarea a plumbului. In prima varianta experimentala, apa de Dunarea a fost folosita nediluata ca mediu de crestere, in a doua varinata experimentala apa de Dunarea a reprezentat 75% din mediul de crestere, iar in ultimele varianta experimentala apa de Dunare a reprezentat 50% din mediul de crestere, experimentul fiind realizat in triplicat. Cel mai bun procent de indepartare a plumbului a fost atins in bazinele cu 100% apa de Dunare, obtinandu-se o reducere a plumbului din volumul de apa de 97,86±0,1%. Specia L. minor poate fi folosita cu succes pentru fitoremedierea apei de Dunare, in scopul folosirii acesteia ca sursa de apa pentru un sistem recirculant in acvacultura.

Cuvinte cheie: Lemna minor, bioacumularea plumbului, sistem recirculant