本实验的研究目的是得到酵母废水的最佳预处理，并探索其最佳预处理条件。通过对酵母废水进行活性污泥絮凝处理以及Ca(OH)2絮凝沉淀处理，并通过单因素实验研究以其作为最佳预处理条件。实验结果表明，Ca(OH)2絮凝沉淀处理能够起到调节pH（从3.84到7.30）的作用，同时对于SO42-能起到比较好的去除率（23.5%~30.1%）。最后选择的Ca(OH)2添加量为1.0g/L，对硫酸根的去除率为29.5%。

The pretreatment of yeast wastewater were studied by activated sludge flocculation combined with Ca(OH)2 flocculation in this paper. The results showed that activated sludge flocculation played a role in regulating pH and diluting influent concentration. Ca(OH)2 flocculation can regulate pH (from 3.84 to 7.30) and remove SO42- (23.5%~30.1%). The best Ca(OH)2 dosage was 1.0 g/L, with which the sulfate can be reduced to 29.1%.