采用从杭州钢铁厂采集来的钢渣(水渣),经过粉碎、碱浸、酸溶、聚合(加入不同量的Fe3+和Al3+)和过滤等方法制得脱色混凝剂PSDC-Ⅵ系列3种.研究了它们对染料废水的脱色效果,考察了影响PSDC-Ⅵ系列混凝剂混凝及脱色效果的因素,并与PAC进行比较.试验表明,PSDC-Ⅵ系列混凝剂在pH≤7和pH≥10时,对试验的染料废水脱色效果较差,在pH=8时,达到最佳脱色效果点.同时在杭州市某印染厂染料废水工程中应用,改进了原有染料废水处理工艺流程,取得了良好的处理效果.PSDC-Ⅵ系列混凝剂处理该厂染料废水的混凝和脱色效果比用PAC时的效果好.%Using the steel slag (water slag) collected from Hangzhou Steel Plant to prepare novel coagulants, after crushing, alkaline leaching, acid dissolving, polymerizing (added with different amount of Fe3+ and Al3+), filtering, and some other procedures, three kinds of decoloration coagulants (PSDC-Ⅵ) were finally produced. The decoloration performance of them on dye wastewater was studied; meanwhile, the factors influencing the coagulation and decolorization performance of the coagulants (PSDC-Ⅵ) were investigated, and then, a comparison test between the said novel coagulants and PAC were carried out. The results showed that, using coagulants (PSDC-Ⅵ ) to treat dye wastewater, the decolorizing effect was poor under the condition that pH ≤ 7 or pH ≥ 10, and the best decolorizing effect was obtained when pH = 8. The said coagulants were applied for the dye wastewater treatment project of a printing and dyeing plant in Hangzhou, the original wastewater treatment process was modified, which finally achieved a good effect. It could be seen that, compared with PAC, coagulants (PSDC-Ⅵ) had a better coagulation and decoloration performance when treating dye wastewater.
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