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In order to improve the removal ability of phosphate, Spheroplast fusions were performed among auxotrophic mutants of Aeromonas hydrophila isolated from waste water, named A13 and A14, Aci37 auxotrophic mutant of Acinetobacter calcoaceticus, and auxotrophic E coli HR262/pCE27 carring pit gene. Eight fusants obtained from this experiment showed different biochemical characteristics. When the rate of phosphate uptake among fusants (FI-F8) was investigated in Phosphate Uptake Medium (PUM), F8 strain showed the highest rate for phosphate removal, 7 times as much as control after two hours incubation. The role of cations (Mg++, Call, K+) in phosphate uptake by F8 was also investigated in PUM without each salt. K` seemed to be crucial. Being compared with phosphate untake rate in PUM, that in PUM without K+ was reduced 1.5 times. Therefore, by applying F8 strain and K+ in practical environmental system, the increased efficiency in phosphate removal can be derived.
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