Ref ID : 1199
Man M. Varma, Harold E. Finley, and Glen H. Bennett; Population dynamics of protozoa in wastewater. WPCF 47(1):85-92, 1975
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The following conclusions seem warranted by the results of this research: 1. Vorticella, responsible for clarification, is dominant in secondary effluent. 2. The death rate of Opercularia is not significantly affected by changes in pH (6.8 to 8.3). The Vorticella population is more sensitive within the same ranges. 3. The Opercularia population increases in number when glutamic acid is added to the medium. Because of these findings, similar tests should be made to determine the optimum protozoa: microorganism ratio at the various substrate concentrations that exit in a treatment plant. Tests should also be conducted to compare catalase activity with this ratio to ascertain the relative importance of protozoa and bacteria in the treatment processes. Studies should be made to determine whether the bacteria are dead or alive when they are eaten by the protozoa.