污泥陶粒催化剂的制备及其对炼油废水深度处理的研究

Preparation of sludge ceramic catalyst and its application in advanced treatment of refinery wastewater

以粉煤灰、黏土和催化活性组分TiO2为原料,炼油废水生物处理过程中产生的剩余活性污泥为造孔剂,经造粒、高温焙烧制备出污泥陶粒催化剂,对催化剂的活性组分种类、活性组分和剩余活性污泥的添加量、焙烧温度进行了研究。结果表明,TiO2的催化活性优于CeO2、锰盐、铜盐和铁盐;以TiO2为活性组分的陶粒TiO2的最佳添加质量分数为6%;随着污泥添加量的增大,陶粒的催化活性逐渐增强,污泥添加量为20%时催化活性最好;最佳的焙烧温度为1100℃。最优条件下制备的污泥陶粒催化剂催化臭氧反应25min,即可将含盐炼油废水生化尾水中的COD从105.16mg/L降至45.31mg/L,达到新修订的国家排放标准。该催化剂重复使用活性无明显衰减,满足工业应用要求,具有良好的应用前景。

A kind of sludge ceramsite catalyst is prepared by granulation and roasting,with fly ash,clay and catalytic active component TiO2 as main raw materials,and residual activated sludge produced during biological treatment of refinery wastewater as pore-forming agent.The effects of type of active components,adding amounts of active components and residual activated sludge,roasting temperature on the catalyst are studied.It is shown that the catalytic activity of TiO2 is better than that of CeO2,manganese salts,copper salts and iron salts,and the optimum adding amount of TiO2 is 6%.With the increase of sludge dosage,the catalytic activity of ceramsite catalyst enhances gradually.The optimal sludge dosage is 20% and the optimum roasting temperature is 1100℃.The ozone catalytic oxidation by ceramsite catalyst prepared under optimal conditions can reduce COD of the biochemical tail water of salt refinery wastewater from 105.16 mg·L^-1 to 45.31 mg·L^-1 in 25 min,meeting China's newly revised national emission standard.The ceramsite catalyst can be reused without significant attenuation in catalytic activity,which can satisfy the requirements of industrial applications and is expected to have excellent application prospect.