微电解与催化氧化法预处理二硝基苯废水的试验研究

二硝基苯生产废水具有硝基苯类化合物浓度高,盐量高,难降解等特点。CODCr的平均浓度为10 000 mg/L,含盐量达30 g/L。本研究采用微电解与催化氧化法对该废水进行处理。结果表明:微电解处理后硝基苯类物质的去除率可达90%以上,但CODCr的去除率较低,只有30%~50%;催化氧化处理后废水的CODCr去除率可达90%以上,但所需Fenton试剂量大,处理成本偏高;采用微电解-催化氧化法处理后CODCr去除率可达95%,硝基苯类物质、on试剂消耗量小,处理成本低。

Study on Wastewater Pretreatment of Dinitrobenzene by Micro-electrolysis and Catalytic Oxidation Method

The wastewater from dinitrobenzene manufacturing process is rich in various nitrobenzene and salt. The value of CODer and the concentration of salt is 10 000 mg/L, 30 g/L respectively. The micro - electrolysis and catalytic oxidation methods was used to preheat the wastewater which is one of the most difficult degradation. The pretreatment result of micro - electrolysis showed that the removal ratio of nitrobenzene was up to 90 %, but the removal ratio of CODCr was only 30 % - 50 %. The removal ratio of CODer could be up to 90 % with the expensive cost of Fenton reagent by the Catalytic Oxidation treatment. The removal ratios of CODCr, nitrobenzene and chroma were up to 95 %, 100 % and 100 % respectively by the two serial steps treatment. The two serial pretreatment steps was proved to be an efficient method and the pretreatment cost could be reduced greatly.