The untreated scrubber water from the Char Oil Energy Development coal liquefaction process was examined for pernicious effects on the protozoan Tetrahymena pyriformis. Cells were exposed to varying concentrations of process water; their behavior, oxygen uptake, and population growth were monitored. Reduction in cell number and motility are directly related to both concentration and length of exposure with concentrations up to 5% and exposures up to 24 hr. The product water causes a nonlinear, dose-dependent reduction in oxygen uptake over a 2 to 5% concentration range. Population growth is reduced by concentrations as low as 0.2% process water. Both the growth rate and the final density of the test populations are inversely related to concentration over the range of 0.2 to 1%. Comparisons with the coal gasification product water are discussed.
- coal liquefaction,
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