Abstract
Domestic wastewater and 0.22 μm pore size wastewater filtrates in a small-scale laboratory wastewater treatment system were inoculated with qual numbers of Eschericia coli and of Bdellovibrio cells. Over a 9-day period, cell counts were made for Bdellovibrio and coliforms. A 3 log reduction within a 72 h incubation period was recorded for both Bdellovibrio and the coliform population inoculated into wastewater. A significant difference (P < 0.05) was observed between the Bdellovibrio populations in wastewater and in wastewater filtrates within an incubation period of 24h and between the coliform populations within an incubation period of 48 h. The data from the study indicate that steady-state conditions appear to exist concerning the interaction between Bdellovibrio and E. coli in waste-water and that Bdellovibrio has only a minor role in the elimination of E. coli from wastewater.
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