Abstract:

The composition of printing and dyeing wastewater is complex, with high chroma and strong toxicity. By analyzing the morphology, antioxidant enzymes and biomarkers of E. coli (Escherichia coli), the biological toxicity of printing and dyeing wastewater before and after treatment with iron-carbon micro-electrolysis process was studied. The results showed that E.coli cells were broken in the influent and most of E.coli cells were in normal shape in the effluent. Compared with the influent, antioxidant enzyme, malondialdehyde (MDA), glutathione (GSH), superoxide dismutase (SOD ), catalase (CAT), and total antioxidant ability (T-AOC) in the effluent group decreased by 80.85%, 53.73%, 67.74%, 44.90% and 43.38%, respectively. After the printing and dyeing wastewater was treated by the iron-carbon micro-electrolysis process, its toxicity was reduced and the antioxidant system of E.coli was nearly in normal level. The glucose consumption inhibition rates of the influent and the effluent were 85% and 47%, respectively. Compared with the influent group, calorific value increased by 21.95%, endogenous fluorescent protein increased by 112.96%, and nucleic acid content decreased by 44.04% in effluent wastewater, respectively. Therefore, the iron-carbon micro-electrolysis process could reduce the biological toxicity of dyeing wastewater.

Key words: iron-carbon micro-electrolysis, biological toxicity, wastewater, reaction, degradation

摘要：

印染废水的成分复杂、色度高、毒性强，通过分析E.coli（大肠杆菌）的形态、抗氧化酶和生物标志物，研究铁碳微电解工艺处理前后印染废水生物毒性的变化。结果表明：E.coli在进水中呈破碎状态，而在铁碳微电解工艺出水中的E.coli大部分为正常形态；与进水的抗氧化酶系统相比，出水组中的丙二醛（MDA）、谷胱甘肽（GSH）、超氧化物歧化酶（SOD）、过氧化氢酶（CAT）和总抗氧化能力（T-AOC）分别降低了80.85%、53.73%、67.74%、44.90%和43.38%，铁碳微电解工艺处理后的印染废水E.coli的抗氧化能力接近正常水平。进水和出水的葡萄糖消耗量抑制率分别为85%和47%；与进水的生物标志物相比，出水中热值升高21.95%，内源荧光蛋白升高112.96%，核酸含量降低44.04%。铁碳微电解工艺具有降低实际印染废水生物毒性的作用。

关键词: 铁碳微电解, 生物毒性, 废水, 反应, 降解