Abstract
Four kinds of chlorinated soultions were investigated to identify the causative substance (s) inhibiting the growth of Porphyra yezoensis thalli. The inhibitory effects were measured in terms of the length and the number of dead cells in Porphyra yezoensis thalli. Tests were conducted by cultures dosed chlorinated municipal sewage effluent, chlorinated ammonium solution, chlorinated municipal sewage effluent after nitrification and chlorinated ion exchanged water, respectively, each culture being subjected to shaking. Chlorinated municipal sewage effluent and chlorinated ammonium solution showed rather severe inhibitory effects on the growth of Porphyra yezoensis thalli as compared to chlorinated municipal sewage effluent after nitrification and chlorinated ion exchanged water. EC50 (10-day) values (in initial chlorine con-centration)for chlorinated municipal sewage effluent, chlorinated ammonium solution and chlorinated ion exchanged water were 0.016mg Cl/l, 0.014-0.020mg Cl/l and 1.4mg Cl/l, respectively. The chlorinated municipal sewage effluent after nitrification did not show any adverse effects on the growth of Porphyra yezoensis thalli. It was determined that only mono-chloramine formed in both chlorinated municipal sewage effluent and chlorinated ammonium solution, and that no chloramine is present in both chlorinated effluent after nitrification and chlorinated ion exchanged water. Therefore, monochloramine was considered to be a causative substance to the growth of Porphyra yezoensis thalli. Above mentioned results suggest that complete nitrification is suitable measures to reduce the adverse effects of chlorinated muni-cipal sewage effluent on the growth of Porphyra yezoensis thalli.
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