类中空颗粒污泥炭填料的制备及作为生物填料的性能表征

Preparation and characterization of hollow-like granular sludge char as BAF filler

城市污泥制备污泥炭,实现污泥的无害化和资源化,受到广泛的关注.文章以棉纤维为内核,涂覆混有氯化锌的污泥浆,通过热解处理,制备污泥炭为外壳,棉纤维为内核的类中空颗粒污泥炭.通过氮气吸附-脱附曲线与SEM对其孔径结构进行分析.重点比较类中空污泥碳与商业活性炭作为填料,在不同条件下对生活污水COD、氨氮和总氮去除性能的差异.类中空污泥碳作为填料的去除效果显然高于市售活性炭填料.因此,利用污泥制备类中空污泥炭,并将其作为填料应用于生活污水的深度处理,具有广阔的应用前景.

Resource utilization of sewage sludge char should be paid more attention to. This work reported a process for preparation of hollow-like granular sludge char （HGC） using carbon fiber as the core and the sludge char as the shell. In this process, the sludge paste mixed with ZnC12 was coated on the spherical cotton surface, and further dried and pyrolyzed at 500 %. The pore structure characteristics of the HGC were investigated by nitrogen adsorption-desorption curves and SEM analysis. Further, the HGC was conducted as filler in the BAF for treatment of the effluent from secondary. The performance of the HGC filler in BAF was evaluated by the COD, NH4^＋ -N and T-N removal efficiencies under varied parameters, further being compared with the commercial activated carbon. Results showed that the COD, NH4^＋ -N and T-N removal efficiencies for HGC are higher than those for activated carbon. Thus, it is a promising process for preparation of efficient BAF filler in the treatment of sewage as well as sludge.