The wastewater containing the azo dye is a global environmental challenge among researchers. In this study, an effort has been made to use a modified carrier (i.e., low-density polyethylene–polypropylene(LDPE-PP)) to remove the Congo red (CR) dye from synthetic wastewater in a moving bed biofilm reactor (MBBR). The effect of CR dye concentration (25 to 300 mg/L), hydraulic retention time (HRT) (12 to 96 h) under the batch mode, and inlet loading rate (ILR) (40 to 320 mg/L day) under the continuous mode were examined. The highest removal efficiency (RE) and elimination capacity (EC) of CR dye were obtained as 99.2% and 214.4 mg/L day, respectively. Three models, namely first-order, Grau second-order, and modified Stover–Kincannon (S–K) were applied to study the kinetic aspects. The highest correlation coefficient (${\mathit{R}}^2$) was obtained for the modified S–K model, and the saturation constant (${\mathit{K}}_B$) and maximum substrate removal rate (${\mathit{U}}_{max}$) were estimated as 0.67 g/L day and 0.71 g/L day, respectively. The proposed kinetic equations can predict the effluent concentration and estimate the bioreactor volume to scale up the process.

含偶氮染料的废水是研究人员面临的全球环境挑战。在这项研究中，已努力使用改良的载体（即低密度聚乙烯-聚丙烯（LDPE-PP））从移动床生物膜反应器（MBBR）中的合成废水中去除刚果红（CR）染料。 。在分批模式下，CR染料浓度（25至300 mg / L），水力停留时间（HRT）（12至96 h）和进样口负荷率（ILR）（40至320 mg / L天）的影响连续模式进行了检查。CR染料的最高去除效率（RE）和消除能力（EC）分别为99.2％和214.4 mg / L天。一阶，Grau二阶和改进的Stover–Kincannon（S–K）三个模型用于研究动力学方面。最高相关系数（${\mathit{[R}}^{\mathrm{2个}}$）是针对修改后的S–K模型获得的，饱和常数（${\mathit{ķ}}_{乙}$）和最大基材去除率（${\mathit{ü}}_{米\mathrm{一种}X}$）分别估计为0.67 g / L天和0.71 g / L天。所提出的动力学方程式可以预测废水浓度并估算生物反应器的体积以扩大该过程。