造纸废水含有各种有毒和有害污染物,对生态系统和人类健康构成重大威胁。尽管存在这些风险,有限的研究已经解决了造纸废水典型工艺处理中涉及的解毒效率和机理。在这项研究中,采用发光菌对不同处理工艺后的造纸废水的急性毒性进行了评价,大型水蚤(D.magna),还有斑马鱼.同时,测量了相应废水的污染程度,并通过三维荧光等技术对废水中有机污染物的转化进行了鉴定。最后,结合相关分析,探讨了不同治疗过程中毒性变化的可能机制。结果表明,造纸废水对发光菌具有较高的急性毒性,并对斑马鱼和D.magna表现出轻微的急性毒性和急性毒性作用,分别。在物理和生化过程之后,不仅完全消除了废水对斑马鱼和D.magna的毒性,而且对发光细菌的抑制作用也显着降低(TU值从11.07降至1.66)。其中,对发光细菌的解毒效率顺序为气浮>水解酸化>IC>好氧过程。相关分析显示,总有机碳(TOC)和化学需氧量(COD)的降低与不同工艺对废水的解毒效率之间存在直接联系。特别是,含苯芳烃污染物的去除与毒性降低呈正相关。然而,芬顿进程,尽管降低了TOC和COD,发光细菌的急性毒性增加(TU值从1.66增加到2.33)。这可能是由于Fenton过程中有机污染物和氧化剂残留物的转化产生所致。因此,氧化技术,如芬顿工艺,作为一个深度的治疗过程,应该更加关注可能引起的生态风险,同时关注其去除污染物的有效性。
Papermaking wastewater contained various of toxic and hazardous pollutants that pose significant threats to both the ecosystem and human health. Despite these risks, limited research has addressed the detoxification efficiency and mechanism involved in the typical process treatment of papermaking wastewater. In this study, the acute toxicity of papermaking wastewater after different treatment processes was assessed using luminousbacteria, zebrafish and Daphnia magna (D. magna). Meanwhile, the pollution parament of the corresponding wastewater were measured, and the transformation of organic pollutant in the wastewater was identified by three-dimensional fluorescence and other techniques. Finally, the possible mechanism of toxicity variation in different treatment processes were explored in combination with correlation analyses. The results showed that raw papermaking wastewater displayed high acute toxicity to luminousbacteria, and exhibited slight acute toxicity and acute toxicity effect to zebrafish and D. magna, respectively. After physical and biochemical processes, not only the toxicity of the wastewater to zebrafish and D. magna was completely eliminated, but also the inhibitory effect on luminousbacteria was significantly reduced (TU value decreased from 11.07 to 1.66). Among them, the order of detoxification efficiency on luminousbacteria was air flotation > hydrolysis acidification > IC > aerobic process. Correlation analyses revealed a direct link between the reduced of Total Organic Carbon (TOC) and Chemical Oxygen Demand (COD) and the detoxification efficiency of the different processes on the wastewater. In particular, the removal of benzene-containing aromatic pollutant correlated positively with decreased toxicity. However, the Fenton process, despite lowering TOC and COD, increased of the acute toxicity of the luminousbacteria (TU value increased from 1.66 to 2.33). This may result from the transformation generation of organic pollutant and oxidant residues during the Fenton process. Hence, oxidation technologies such as the Fenton process, as a deep treatment process, should be more concerned about the ecological risks that may be caused while focusing on their effectiveness in removing pollutant.