石化废水处理过程中活性污泥毒性变化

发布时间：2019-05-23 05:59

【摘要】：考察了某石化园区废水从进入污水处理厂到到达好氧生物处理单元之前,各级工艺处理后废水对活性污泥的毒性的变化情况,通过活性污泥耗氧速率抑制效应、脱氢酶活性抑制效应和发光细菌急性毒性3种指标表征石化废水的活性污泥毒性,测定了沿程各节点废水的三维荧光光谱,并解析了石化废水对活性污泥的毒性与其荧光光谱特征之间的相关性.结果表明,石化废水对好氧生物处理工艺中硝化细菌耗氧速率的抑制率达50%~60%,经过好氧生物处理单元之前的各级处理后,抑制作用仍然在30%左右.在沿程各处理工艺中,水解酸化与A段缺氧处理对毒性削减作用相对明显.比较3种毒性表征方法的结果,耗氧速率法较适合评价石化废水对活性污泥的毒性.各水样的荧光峰集中在λ_(ex)/λ_(em)=200~300/250~400nm区域,其中峰C(λ_(ex)/λ_(em)=225/340)、E(λ_(ex)/λ_(em)=275/325)、F(λ_(ex)/λ_(em)=275/335)与毒性相关性较强,因此,检测发射波长在325~340nm内荧光物质有助于快速表征石化废水活性污泥毒性.
[Abstract]:The toxicity of wastewater to activated sludge after treatment from wastewater treatment plant to aerobic biological treatment unit in a petrochemical park was investigated, and the oxygen consumption rate of activated sludge was suppressed by the oxygen consumption rate of activated sludge. The activity inhibition effect of dehydrogenase and the acute toxicity of luminous bacteria were used to characterize the toxicity of activated sludge in petrochemical wastewater. The three-dimensional fluorescence spectra of wastewater along each node were determined. The correlation between the toxicity of petrochemical wastewater to activated sludge and its fluorescence spectrum characteristics was analyzed. The results showed that the inhibition rate of nitrifying bacteria oxygen consumption in aerobic biological treatment process was 50% 鈮，

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