聚硅酸铝铁处理印染废水的研究

Studies on Treatment of Dyeing Wastewater with Polysilic Aluminium Ferric Flocculants

以硫酸铝渣为主要原料制备聚硅酸铝铁絮凝剂并对其絮凝性能进行了研究．实验结果表明：处理蒽醌型分散黄染料时，铝、铁总浓度（简记为M）对脱色有重要影响，但铝、铁相对含量无显著影响；使用n（M）：n（SiO2）=1．0、n（Al）：n（Fe）=1．0的聚硅酸铝铁，用量为每升1．0mL，分散黄溶液pH6～10时，脱色率为90g左右．处理工业印染废水，当聚硅酸铝铁n（M）：n（SiO2）=1．0、n（Al）：n（Fe）=1.0～3.0，用量为每升2．0mL时，脱色率达90g左右；与聚合氯化铝相比，聚硅酸铝铁在CODCr去除率方面有明显优势．采用透射电镜对处理工业印染废水的机理进行了探讨．

The polysilic aluminium ferric flocculants were prepared from bauxite sludge. Its flocculating effects were studied. The flocculating test of anthraquinone disperse yellow solution of pH 6 -10 resulted in about 90% reduction for color by 1.0 mL/L flocculants of n（Al） ： n（Fe） = 1.0, n（M） ： n（SiO2） = 1.0. The flocculants were applied to treat industrial dyeing wastewater, and results showed that the color removal rate was about 900/00 when the flocculants of n（Al） ： n（Fe） = 1.0 - 3. 0,n（M） ： n（SiO2） = 1.0 by 2.0 mL/L were used. These flocculants were much better than PAC in removal rate of CODCr when treating dyeing wastewater. In addition, the flocculating mechanism was also discussed.