论文部分内容阅读
以聚硅酸(PSA)、硫酸铝(AS)、氢氧化铝(AH)、丙烯酰胺(AM)为原料制备了无机-有机复合絮凝剂聚丙烯酰胺-聚硅酸铝(PAM-PASS)。讨论丙烯酰胺加入量、铝硅摩尔比、硅酸活化p H对复合絮凝剂絮凝效果的影响,得到制备复合絮凝剂最佳工艺条件:二氧化硅质量分数为7%,硅酸活化1 h(p H=3.0),铝硅摩尔比为3∶1,PASS熟化1 h,丙烯酰胺质量占总物料质量为20.7%,氢氧化铝质量占总物料质量为7.5%,以过硫酸铵和亚硫酸氢钠为引发剂,反应温度为40℃,PAM-PASS合成3 h。利用因子设计和响应面法研究了絮凝试验中废水酸度和投入量对絮凝效果的影响。结果表明,PAM-PASS复合絮凝剂的最佳操作条件为p H=6.5~7.5和投入量为15~20 mg/L。根据实验结果得到最优化效果为:废水p H为7.20,投药量为17.00 mg/L,除浊率为97.87,试验验证结果与实际效果相吻合。
Polyacrylamide-polysilicate aluminum (PAM-PASS) was prepared by using polysilicic acid (PSA), aluminum sulfate (AS), aluminum hydroxide (AH) and acrylamide (AM) as raw materials. The effects of acrylamide dosage, molar ratio of Al-Si and activated silicate pH on the flocculation effect of the composite flocculant were discussed. The optimum conditions for the preparation of the composite flocculant were as follows: silica mass fraction 7%, silicic acid activation 1 h ( p H = 3.0), the molar ratio of aluminum to silicon was 3:1, the mass of acrylamide was 20.7% and the mass of aluminum hydroxide was 7.5% Hydrogen sodium as initiator, the reaction temperature is 40 ℃, PAM-PASS synthesis 3 h. The factorial design and response surface methodology were used to study the effect of wastewater acidity and input on flocculation efficiency in flocculation test. The results showed that the optimum operating conditions of PAM-PASS flocculant were p H = 6.5 ~ 7.5 and the dosage of 15 ~ 20 mg / L. According to the experimental results, the optimized results are as follows: the wastewater p H is 7.20, the dosage is 17.00 mg / L, the turbidity removal rate is 97.87, the experimental verification results are consistent with the actual results.