超声法从剩余污泥中提取微生物絮凝剂的研究

Study on microbial flocculant extraction from excess sludge by ultrasonic method

摘要:

通过超声系列试验，对超声法从剩余污泥中提取微生物絮凝剂（MBF）进行了系统研究。从剩余污泥中提取的MBF在偏酸性条件下和35-40 ℃范围内表现出较高的絮凝活性。超声时间以1-3 min为宜，超声功率以210-270 W为宜。污泥浓度越高，所提取的MBF浓度越高；对于从高浓度污泥提取的MBF，投加剂量可随污泥浓度升高而减小以获得较好的絮凝效果。MBF主要成分包括蛋白质、多糖和核酸。研究结果表明，超声法可用于从剩余污泥中直接提取MBF，在降低MBF生产成本的同时实现污泥的资源化利用。

Abstract:

Microbial flocculant (MBF) extraction from excess sludge by ultrasonic method was systematically studied. The MBF extracted from excess sludge showed higher flocculating activity under acidic conditions and 35-40 oC. The optimum ultrasonic time and the optimum ultrasonic power were 1-3 min and 210-270 W, respectively. The concentration of the extracted MBF from the sludge by ultrasonic method increased with the rising sludge concentration. To get the best flocculation efficiency, MBF dosage can be decreased with the rising sludge concentration. The main components of MBF consisted of proteins, polysaccharides, and nucleic acids. According to the results, ultrasonic method was feasible to extract MBF from excess sludge, which could not only save the cost of MBF production, but also realize the resource reuse of excess sludge.