Optimization of biological phosphorus removal from contaminated sediments with phosphate-solubilizing microorganisms
2005
Kim, Y.H. (Yonsei Univ., Seoul (Korea R.)) | Bae, B. | Choung, Y.K.
This study focused on the characteristics of phosphate-solubilizing microorganisms (PSMs) which can be applied for the removal of phosphorus from sediments to prevent eutrophication of lakes or ponds. A PSM isolated from rhizospheric soil and temporarily identified as Burkholderia glathei (MB 14) produced gluconate and acetate using glucose as a carbon source and its meta-bolic activity caused the pH of the liquid medium to decrease as low as 4.4. The molar ratio of sol-ubilized PO4 3- -P to total organic acids, gluconate and acetate, in the liquid medium was 1:2, which was lower than the theoretical molar ratio of 1:3 using Ca3(PO4)2 as a model phosphorus compound. In addition, biological PO4 3- -P solubilization with MB 14 was more efficient than the direct addition of equivalent acid to the liquid medium. These results indirectly suggest that organic acids chelate Ca sup(2+)during solubilizatlon of PO4-P The growth conditions for MB 14 that produced the maximum PO4 3 - -P solubilization were carbon sources of 8g// of glucose and 2 g// of sucrose, and 0.1 g//of arginine as a nitrogen source under an anoxic environment. The PSM species, MB 14, grown under these conditions was applied to treat contaminated dredged sediments in a bioslurry reactor. In 9 d, MB 14 solubilized 34.5% of total phosphorus in the contaminated dredged sediments.
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