污泥/油页岩半焦陶粒制备优化及其在污水处理中的应用研究

PREPARATION OPTIMIZATION OF SLUDGE/OIL SHALE SEMI-COKE CERAMSITE AND ITS APPLICATION IN SEWAGE TREATMENT

近年来,随着乡镇中小型污水处理厂的兴建,污泥作为水处理的副产物之一,其产量及处理量攀升。以油页岩半焦和粉煤灰为辅料结合污水厂污泥烧制了可用于曝气生物滤池的陶粒滤料,通过对原料配比、预热温度、烧制温度和烧制时间的研究,结合响应曲面建立的拟合度较高的优化模型,模拟确定了最佳的制备工艺条件:预热温度390℃、烧制温度1125℃,烧制时间11.5 min。具有高吸水率等特点,满足CJ/T 299—2008《水处理用人工陶粒滤料》要求的陶粒滤料要求,且对COD和NH_(3)-N的处理效果满足GB 18918—2002《城镇污水处理厂污染物排放标准》中一级A标准。

In recent years,with the construction of small and medium-sized sewage treatment plants in towns,sludge as one of the by-products of water treatment,its output and treatment capacity are continuously increasing.In this study,oil shale semicoke and fly ash are used as auxiliary materials combined with sewage sludge to fire ceramsite filter material which can be used in biological aerated filter.Through the study of raw material ratio,preheating temperature,firing temperature and firing time,combined with the response surface,the optimization model with high fitting degree was established.The optimum preparation conditions were determined by simulation:preheating temperature 390℃,firing temperature 1125℃,firing time 11.5 min.With the characteristics of high water absorption,it meets the requirements of CJ/T 299—2008"artificial ceramic filter material for water treatment",and the treatment effect of COD and NH_(3)-N meets the first-class A standard in GB 18918—2002"Pollutant Discharge Standard for Urban Sewage Treatment Plant".