Effectiveness of constructed wetlands in reducing acute toxicity of reclaimed water

• Published in: Guanʻgai paishui xuebao Vol. 44; no. 7; pp. 114 - 120
• Main Authors: HE Shunneng, WU Wenyong, HAN Yuguo, HU Yaqi, MA Meng, JIANG Tingting
• Format: Journal Article
• Language: Chinese
• Published: Science Press 01.07.2025
• Subjects: reclaimed water; artificial wetland; luminescent bacteria; acute toxicity
• ISSN: 1672-3317
• DOI: 10.13522/j.cnki.ggps.2024291

【Objective】Constructed wetlands are an effective technology for wastewater treatment. This study experimentally investigates their effectiveness in reducing the acute toxicity of reclaimed water.【Method】The experiment was conducted in two wetlands, one in Niantan and the other in Annan. In both wetlands, the acute toxicity of reclaimed water was evaluated using the luminescent bacteria assay. The effectiveness of the constructed wetlands was assessed by measuring the equivalent concentration of the toxic reference substance zinc sulfate heptahydrate (ZnSO₄·7H₂O).【Result】Subsurface-flow wetland was found to be more effective than subsurface-flow wetland, particularly in reducing the acute toxicity of reclaimed water. The subsurface-flow wetland in Niantan reduced toxicity levels by 16.16%, and decreased the average luminescence inhibition rate by 19.31%. The subsurface-flow wetland in Annan reduced the inhibition rate by 18.55%, with a final effluent inhibition rate of 10.64%, representing a 9.39% reduction co