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    印染废水对3种水生生物的毒性作用

    Toxicity of Printing-Dyeing Wastewater to Aquatic Organisms

      摘要
    • 摘要: 为合理评估印染废水对水环境造成的影响，以斜生栅藻（Scenedesmus obliquus）、大型溞（Daphnia magna）和太湖花鱼骨（Hemibarbus maculates）为受试生物，印染废水分别用标准稀释液7346-2按照几何级数稀释成为100.00％、50.00％、25.00％、12.50％和6.25％的系列试验液，研究印染废水对3种水生生物的毒性效应。结果表明，印染废水对水生态系统中不同营养层次的3种生物均有一定的毒性，对斜生栅藻24、48h的半数生长抑制浓度（EC50）分别为（51.55±4.12）%、（20.40±6.27）%，对大型溞24、48h的EC50分别为（78.20±4.31）%、（53.10±1.88）%，对花(鱼骨)卵裂期胚胎、囊胚期胚胎、原肠期胚胎、初孵仔鱼和25日龄仔鱼96h的半数致死浓度（LC50）分别为（19.89±1.68）%、（25.95±2.14）%、（27.24±0.88）%、（19.61±2.21）%和（49.27±3.27）%。研究得出印染废水对水生生物的安全浓度为1.96%，生产中应严格控制其排放。

       

      Abstract: To evaluate impact of printing-dyeing wastewater on aquatic ecological systems,an experiment was carried out using Scenedesmus obliquus, Daphnia magna and Hemibarbus maculates as subjects for test of toxicity of printing-dyeing wastewater.In the experiment the wastewater was diluted with 7346-2 standard diluent into solutions different in concentration,i.e 100.00%,50.00%,25.00%,12.5%,and 6.25%.Results show that the wastewater was somewhat toxic to all the three kinds of aquatic organisms in the aquatic ecosystem regardless of its nutrient level.The 24 and 48 h-EC50(effective concentration for reduction of growth by 50%)of the wastewater was (51.55±4.12)% and (20.40±6.27)%,respectively,to S.obliquus,and (78.20±4.31)% and (53.10±1.88)%,respectively,to D.magna.The 96h-LC50 of the wastewater to cleavage stage,blastula stage,gastrula stage,lava,and 25-day fingerlings of H.maculates was (19.89±1.68)%,(25.95±2.14)%,(27.24±0.88)%,(19.61±2.21)%,and (49.27±3.27)%,respectively.The safe concentration of the wastewater to aquatic organisms was 1.96%.So,discharge of such wastewater should be strictly controlled in practice.

       

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