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以改性淀粉、拜尔法赤泥为原料,制备了含碳聚硅酸铝铁絮凝剂(R-CSiAFS),研究其对污泥的脱水性能,并采用红外光谱仪(FTIR)、X射线衍射仪(XRD)、扫描电镜(SEM)和热重分析仪(TGA)对R-CSiAFS复合絮凝剂进行表征.结果表明,赤泥经硫酸前处理后,总铁(TFe)和Al~(3+)的浸出率分别为81.44%和96.83%.在(Al+Fe)/淀粉质量比为0.55/1,最佳pH=3.0,SiO_2质量分数为0.375%的条件下制得最优R-CSiAFS.利用此絮凝剂进行污泥脱水实验,当投加量为330 mg·L~(-1),污泥体系pH为7.0时,污泥比阻SRF降低了92.3%,沉降比SV30从90.0%降低到79.9%.
The modified starch and Bayer process red mud were used as raw materials to prepare the aluminum-polysilicate ferric silicate flocculant (R-CSiAFS). The dewaterability of the sludge was studied. FTIR, X-ray diffraction X-ray diffraction (XRD), scanning electron microscopy (SEM) and thermogravimetric analysis (TGA) were used to characterize the composite flocculant. The results showed that the total iron (TFe) and Al ~ ) Were 81.44% and 96.83%, respectively.The optimum R-CSiAFS was obtained under the condition of (Al + Fe) / starch mass ratio of 0.55 / 1, optimal pH = 3.0 and SiO 2 mass fraction of 0.375%. When the sludge dosage was 330 mg · L -1 and the pH value of the sludge system was 7.0, the sludge specific resistance SRF decreased 92.3% and the sedimentation ratio SV30 decreased from 90.0% To 79.9%.