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KMID : 0545120100200030594
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Journal of Microbiology and Biotechnology
2010 Volume.20 No. 3 p.594 ~ p.601
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Biological treatment of two-phase olive mill wastewater (TPOMW, alpeorujo): Polyhydroxyalkanoates (PHAs) production by Azotobacter strains
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Cerrone Federico
Sanchez-Peinado Maria del Mar
Juarez-Jimenez Belen
Gonzalez-Lopez Jesus
Pozo Clementina
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Abstract
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Azotobacter chroococcum H23 (CECT 4435), Azotobacter vinelandii UWD and Azotobacter vinelandii (ATCC 12837 ), members of the family Pseudomonadaceae, were used to evaluate their capacity to grow and accumulate polyhydroxyalkanoates (PHAs) using two-phases olive mill wastewater (TPOMW, alpeorujo) diluted at different concentrations as sole carbon source. The PHAs amounts (g/L) increased clearly when the TPOMW samples were previously digested under anaerobic conditions. The MNR analysis demonstrated that the bacterial strains formed only homopolymers containing ?-hydroxybutyrate either when grown in diluted TPOMW media or diluted anaerobically digested TPOMW medium. COD values of the diluted anaerobically digested waste were measured before and after aerobic PHA-storing phase, and a clearly reduction (72%) was recorded after 72h of incubation. The results obtained in this study suggest the perspectives for using these bacterial strains to produce PHAs from TPOMW and in parallel, contribute efficiently to the bioremediation of this waste. This fact seems essential if bioplastics are to become competitive products.
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KEYWORD
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Two-phase olive mill wastewater (TPOMW), polyhydroxyalkanoates (PHAs), Azotobacter sp, chemical oxygen demand (COD)
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