Polysilicate aluminum ferric (FD-PSAF) was prepared from foundry dust under polymerization temperature of 50 °C, polymerization time of 2 h and pH 2, to produce its amorphous Si–Al–Fe polymer. Removal efficiency of chemical oxygen demand (COD), color, turbidity and phosphate from swine wastewater reached 50.4%, 95.7%, 97.1% and 99.7% after addition of 10 mL/L of the prepared FD-PSAF, which were higher than those obtained when using polysilicate aluminum ferric (PSAF), polyaluminum chloride (PAC) and polymerized ferrous sulfate (PFS). The percentage content of Fe for PFS, PSAF and the prepared FD-PSAF was 7%, 11% and 24%, respectively. The mean particle size in the swine wastewater increased from 39 nm to 84 nm, 1003 nm, 1198 nm and 2138 nm respectively after the addition of PSAF, PAC, PFS and prepared FD-PSAF into the swine wastewater. The prepared FD-PSAF with the higher coagulation performance could be related to its higher percentage content of Fe and greater particle aggregation ability. The removal efficiency of color, turbidity and phosphate from swine wastewater by FD-PSAF did not obviously change with storage time from 1 d to 32 d, indicating that FD-PSAF had good stability performance. The FD-PSAF is an efficient coagulant that could be used to treat swine wastewater.

中文翻译：

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铸造粉尘聚硅酸铝铁混凝剂的制备及其处理养猪废水的混凝性能


以铸造粉尘为原料，在聚合温度为 50°C、聚合时间为 2 小时、pH 为 2 的条件下制备聚硅酸铝铁 (FD-PSAF)，以产生无定形 Si-Al-Fe 聚合物。添加10 mL/L制备的FD-PSAF后，对养猪废水中化学需氧量（COD）、色度、浊度和磷酸盐的去除效率分别达到50.4%、95.7%、97.1%和99.7%，高于所得结果当使用聚硅酸铝铁（PSAF）、聚合氯化铝（PAC）和聚合硫酸亚铁（PFS）时。 PFS、PSAF和制备的FD-PSAF的Fe百分比含量分别为7%、11%和24%。在养猪废水中添加PSAF、PAC、PFS和制备的FD-PSAF后，养猪废水的平均粒径分别从39 nm增加到84 nm、1003 nm、1198 nm和2138 nm。制备的FD-PSAF具有较高的混凝性能可能与其较高的Fe含量和较大的颗粒聚集能力有关。 FD-PSAF对养猪废水的色度、浊度和磷酸盐的去除效率在1 d到32 d的储存时间内没有明显变化，表明FD-PSAF具有良好的稳定性能。 FD-PSAF 是一种高效混凝剂，可用于处理养猪废水。