摘要:
草履虫作为指示生物评估印染废水处理过程及排放水的毒性效应。急性毒性结果显示,原水、厌氧工段印染废水、好氧工段印染废水对草履虫的半数致死浓度(24h-LC50)分别为54%、41%、98%;遗传毒性结果显示,印染废水原水、经处理的排放水在6.25%、12.25%稀释梯度下对草履虫造成的DNA损伤较对照组呈显著升高(p < 0.01),而排放水对草履虫的DNA损伤较原水无显著性差异;草履虫增殖速率结果显示,印染废水排放水50%稀释梯度下对草履虫增殖速率有抑制作用。暴露于印染废水排放水中10%的草履虫其游动行为发生改变。以上结果表明,印染废水在经过处理后,理化指标均达到国家印染废水行业排放标准,但排放水仍对草履虫产生急性毒性,且遗传毒性较原水没有显著降低。水生生物毒性测试能有效补充理化指标评价,为印染废水行业全面达标排放提供依据。
Abstract:
The effect of toxicity of dyeing effluent was evaluated by Paramecium caudatum. The results of acute toxicity showed that 24h-LC50 of tank and effluent's water samples were 54%, 41%, 98%, respectively. The results of genetic toxicity showed that influent at concentration of 6.25% and effluent at concentration of 12.25% caused Paramecium caudatums' DNA damage significantly higher than that of the control group (p < 0.01). However, compared with influent, the DNA damages of effluent were no significantly different. The results of growth rate showed that effluent at cocnetration of 50% inhibited Paramecium caudatums' growth. 10 percent of Paramecium caudatums' swimming behavior changed after exposure to effluent. Although treated dyeing effluent's physico-chemical indicators were in line with national dyeing wastewater discharge standards, the effluent still induced acute toxicity to Paramecium caudatum, and genetic toxicity was not significantly reduced. Biological toxicity test can be an effective complement to evaluate the physico-chemical indicators, and provide the basis for dyeing wastewater industry's comprehensive discharge standards.
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