造纸废水深度处理中催化剂的研制

Study on Catalyst for Advanced Treatment of Papermaking Effluent

关键词:  催化剂  深度处理  造纸废水

Key Words:catalyst  advanced treatment  papermaking wastewater

摘要:采用催化氧化法对造纸废水进行了深度处理的研究。研制了以CuO为活性组分，活性炭为载体的非均相催化剂，探索了Cu²⁺浓度、焙烧温度、焙烧时间等因素对催化剂的影响，确定了最佳制备方案：Cu²⁺浸渍浓度为6%，焙烧温度为300℃，焙烧时间为3 h。再对铜系催化剂加入稀土铈进行改性研究，得出Ce²⁺的最佳含量为6%。通过XRD、SEM对改性前后的催化剂进行了性能表征，并对催化剂的使用寿命及活性金属溶出进行了比较。结果表明，铈的存在提高了催化剂的催化活性和稳定性。该催化剂的应用可以使废水COD^Cr＜90 mg/L，达到GB3544—2008制浆造纸工业水污染物排放标准的要求。

Abstract:The catalytic oxidation method was developed for advanced treatment of the papermaking effluent, which could not meet the new discharge regulation for pulp and paper industry only using biological treatment technology. A heterogeneous catalyst was studied with Cu²⁺ as the active component and activated carbon as the carrier. The effects of Cu²⁺ concentration, calcination temperature and calcination time on the Cu-based catalyst performance were explored and optimal catalyst preparation conditions were as 3 h calcination at 300℃ with 6% Cu²⁺ impregnation concentration. In addition, CuO-CeO² catalyst was also studied, which showed 6% Ce²⁺ concentration was the optimal content. The catalysts with and without Ce doping were characterized by scanning electron microscopy (SEM) and X-ray diffraction (XRD). Catalyst life and metal leaching were investigated also. The results showed that Ce improved the activity and stability of catalysts. The chemical oxygen demand was less than 90 mg/L after advanced treatment of papermaking effluent，it meets the water pollutants discharge regulation GB3544—2008 for Pulp and Paper Industry.