以TEOS为硅源的聚硅硫酸铁制备与除藻性能

Preparation of Poly-ferric Silicate Sulfate(PFSS) from Tetraethylorthosilicate and Its Algae Removal Performance

采用正硅酸乙酯(TEOS)代替传统的硅酸钠制备活性硅酸,将活性硅酸与聚合硫酸铁反应合成聚硅硫酸铁混凝剂,并研究了相关机理。由于正硅酸乙酯水解很缓慢,容易控制,可以得到重现性好的产物,有利于进行除藻性能的研究。通过正交实验等研究获得了聚硅硫酸铁的优化合成条件,即铁硅摩尔比为1.0,反应温度为50℃和反应时间为60 min。论文还研究了优化条件下合成的聚硅硫酸铁混凝剂除藻性能,得到除藻优化条件,即原水的pH值为11.0、预氧化剂的投加量为0.70 mg/L、聚硅硫酸铁的投加量为24.1 mg/L。

Poly-ferric silicate sulfate flocculants were prepared by using tetraethylorthosilicate and polyferric sulfate as raw materials. The relevant mechanism was studied. And it was found that since tetraethylorthosilicate had the characteristics of slow hydrolyzation, the reaction was easy to control. Thus, the products had a good repeatability, which was better for the study of algae removal. The optimum preparation conditions of poly-ferric silicate sulfate were determined by using orthogonal design, in which Fe/SiO2 mole ratio was 1, polymeric temperature was 50℃ and polymeric time was 60 minutes.Furthermore, the optimum raw waste water was 11.0, dosage of pre-oxidation was conditions of removals algae were determined as well, in which when the pH of the dosage of PFSS prepared in the optimum condition was 24. lmg/L and the 0.7mg/L.