高炉瓦斯灰曝气生物滤池填料的制备及其性能研究

Preparation and performance study of filter media made by blast furnace dust for a biological aerated filter

以高炉瓦斯灰为主要原料、粘土和硅酸钠作为添加剂制备曝气生物滤池填料.通过正交试验得出高炉瓦斯灰曝气生物滤池填料的最佳制备工艺条件为:高炉瓦斯灰、粘土、硅酸钠质量分数分别为79%,15%,6%,烧制温度为600℃.该曝气生物滤池填料具有密度较小、强度较大、比表面较大等特点,将其应用于曝气生物滤池处理酱油废水,在水力停留时间为4 h、气水比6∶1、滤层高度为100 cm的情况下,COD的去除率达到70.3%,NH3-N的去除率达到74%,色度的去除率达到60%,取得了较好的处理效果.利用高炉瓦斯灰制备曝气生物滤池填料,为高炉瓦斯灰的资源化利用探索了一条新途径.

Filter media for a biological aerated filter （BAF） were prepared with blast furnace dust as the main material, and with clay and sodium silicate as chemical additives. Through the orthogonal experiment, the optimal preparation condition was obtained, which is 79% blast furnace dust, 15% clay, 6% sodium silicate and 600 ℃ calcination. The filter media have the characteristic of lower density, higher compression strength and larger specific surface. Soy sauce wastewater was treated in BAF by adopting this kind of filter media. When the hydraulic retention time （HRT） is 4 hour, air-water ratio is 6 ： 1, and the height of filter media is 100 cm, the removal rate of COD, NH3-N and chroma is 70.3%, 74% and 60%, respectively. This method incorporates the concept of circular economy and explores a new pathway to utilize the resources of blast furnace dust.