| Abstract:Typically, pulping and paper making wastewater contains high levels of non-biodegradable organics, and this type of organics still exist after secondary treatment. This paper reports the first scientific study to apply sulfate radical (SO-4·)-based advanced oxidation process (SR-AOP) to treat papermaking wastewater, with an emphasis of removal of COD and color of refractory organics. Using zero-valent iron (ZVI) activated persulfate (PS) for the oxidation of the wastewater after secondary treatment(CODCr of 160 mg/L, color of 200 degrees) was studied through a series of batch experiments. The effect of pH on the degradation efficiency of wastewater was investigated on the condition of room temperature, also the effects of ZVI dosage and PS dosage were examined. The results showed that, the efficiencies of CODCr degradation or color removal are about 57.5% and 83% at condition of pH=3 within 3h, or about 34.2% and 89% at condition of pH=8.14 with 3h when the ZVI dosage was 8 g/L and PS dosage was 4 g/L respectively. The secondary treatment wastewater and the advanced treatment wastewater with SR-AOP were qualitative analyzed and quantitative determined using GC-MS analyzer, the results showed that some of organics were removed and others were partially degraded after advanced treatment. |
