Abstract:

The aerated zero-valent iron was used to treat the high salinity pesticide wastewater containing cyanide, which reduced post-processing load and the toxicity of wastewater and created favorable conditions for subsequent treatment.The results indicated, under the conditions that pH was 4, Fe∶C(g/g）was 1∶1, aeration flux was 150 L·h^-1, reaction time was 3h, the removal rate of COD was 61.6% and the concentration of effluent’s CN^- was 3.52 mg·L^-1.Through the primary dynamics analysis, COD removal process was divided into three phases.First, the acidic dissolution phase of iron, the COD removal by aeration phase, the dissolution velocity of iron was 3.03 g TFe·h^-1.Second, the high velocity phase, about 87.1% of COD that being removed in all process was transformed.Third, the stagnation phase of zero-valent iron, the COD removal was stopped.

Key words: 微电解, 曝气, 农药废水, 铁溶出

摘要：

微电解法可减轻后续处理负荷，降低废水毒性，为后续处理创造良好的条件。研究了几个主要工艺条件对其预处理高盐含氰农药废水COD和CN-的影响。结果表明，其最佳条件pH=4、铁炭质量比Fe∶C=1∶1、曝气量Q=150 L·h^-1、t=3 h时，COD微电解, 曝气, 农药废水, 铁溶出