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针对某医药中间体废水成分复杂,有机物浓度高,具有生物抑制性,废水可生化性差等特点,对其进行了铁碳微电解联合Fenton氧化-混凝沉淀预处理试验研究。通过正交试验进行了微电解过程中铁碳比、反应停留时间、pH、铁粉投加量等参数的优化,COD的去除率为29.1%。结合后续Fenton氧化与混凝沉淀试验,当H2O2投加量为8%,适当调节混凝pH,整个预处理系统出水COD去除率达45.0%,总磷的去除率达77.1%,盐度去除率为24.8%,色度去除率高达95%,可生化性提高至0.29,为后续综合污水的生物处理提供了有利条件。
Aiming at the complex composition of wastewater, high concentration of organic compounds, biological inhibition and poor biodegradability of wastewater, a pharmaceutical intermediates wastewater was pretreated with Fenton oxidation-coagulation pretreatment. Through the orthogonal experiment, the parameters of iron-carbon ratio, reaction residence time, pH and iron powder dosage were optimized. The removal rate of COD was 29.1%. Combined with the subsequent Fenton oxidation and coagulation-sedimentation experiments, when the dosage of H2O2 was 8%, the pH of coagulation was properly adjusted, the effluent COD removal rate of the whole pretreatment system was 45.0%, the total phosphorus removal rate was 77.1%, the salinity removal rate Was 24.8%, the removal rate of chroma was as high as 95% and the biodegradability was increased to 0.29, which provided favorable conditions for the biological treatment of subsequent integrated sewage.