预混凝-Fenton氧化法深度处理废纸造纸废水研究

摘要

The advanced treatment of the secondary biochemical effluent of the regenerated papermaking wastewater from a paper mill in Xinmi City has been conducted by pre-coagulation-Fenton oxidation process. The effects of main factors on COD removing rate are investigated and the optimal technological conditions are determined. The results show that a very good result can be obtained by using pre-coagulation-Fenton oxidation process for the ad-vanced treatment of regenerated paper-making wastewater. The total COD removing rate is 84.82%,and the effluent COD is 76 mg/L,reaching the recycling requirements. After the oxidation treatment,the residual H2O2 in wastewater would have influence on COD. Adjusting temperature and pH is not suitable for removing low-concentration H2O2. After the treatment,most organic pollutants can be degraded and part of aromatic ring structure of lignin fragments split are converted into aliphatic carboxylic acid organic matter.%采用预混凝—Fenton氧化法对新密市某造纸厂废纸造纸废水的二级生化出水进行深度处理，研究了各主要因素对COD去除率的影响，确定了最佳工艺条件。实验结果表明：采用预混凝—Fenton氧化法深度处理废纸造纸废水可取得很好的效果，COD总去除率为84.82%，出水COD为76 mg/L，达到回用要求。氧化处理后，废水中残余的H2O2会对COD产生影响，调节温度和pH不适宜去除低浓度的H2O2。该废水经处理后大部分有机污染物被降解，部分木质素片段芳环结构开裂转化成脂肪族羧酸类有机物。