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The effect of residual chlorine on the growth of Selenastrum capricornutum was investigated by an algal growth test to evaluate toxicity. Significant reductions in growth due to monochloramine were observed in the green alga, Selenastrum capricornutum; however, algal growth was not inhibited in the medium containing rice bran because of the disappearance of monochloramine. The removal of monochloramine by rice bran was attributed to the chemical’s decomposition by direct reaction with the rice bran. In contrast, no significant reduction in growth was observed in the medium containing free chlorine. The decomposition rate of monochloramine was slower than that of free chlorine in the medium.

Effect of Rice Bran on the Growth Inhibition of Selenastrum Capricornutum by Chlorine and Monochloramine