Abstract
The impacts of total residual oxidant (TRO) on ecological health have been of great concern due to their widespread ubiquity in disinfection process. However, little is known about the effects of discharge water produced by electrolysis-based Ballast Water Management System (BWMS) on the toxicity of plankton. The present study was conducted to investigate the effects of TRO at discharge-relevant concentrations on plankton under different salinity conditions. The results showed that brackish water always gave the highest TRO concentrations, which is related to the natural organic matter (NOM) content. TRO exposure significantly (p<0.01) inactivated ≥ 50 μm and 10–50 μm organisms. Biodiversity dropped significantly after TRO exposure, especially in brackish water conditions. Meanwhile, the discharge water still has an impact on plankton after neutralization. Therefore, proper disposal of TRO generated by BWMS is significant to maintain ecological balance and protect native biodiversity.
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