Faculty of Chemical, Environmental and Biological Science and Technology, Dalian University of Technology, Dalian 116024, China.
Faculty of Chemical, Environmental and Biological Science and Technology, Dalian University of Technology, Dalian 116024, China.
Bioresour Technol. 2013 Oct;146:51-56. doi: 10.1016/j.biortech.2013.07.036. Epub 2013 Jul 13.
Excess biological sludge was utilized to prepared bioflocculant with hydrochloric acid. The prepared crude bioflocculant was purified and fractionally precipitated to attain four purified sludge bioflocculant defined as PSB1-4. The PSB-2 has higher flocculating rate for kaolin suspension than others. When the pH of the flocculation system ranged from 4.0 to 11.0 the flocculating rates of PSB-2 were over 96.0%. X-ray photoelectron spectroscopy (XPS) and Fourier transform infrared (FTIR) spectra showed that amino and hydroxyl groups were present in the bioflocculant molecules. More amine group existed in the bioflocculant PSB-2 relatively. The amino group was believed to play an important role in flocculation. The experiment of zeta potential measuring indicated that the charge neutralization contributed to flocculation process. Flocculating mechanism investigation reveals that the sludge bioflocculant caused kaolin suspension instability by means of charge neutralization firstly and then promoted the aggregation of suspension particles by adsorption and bridge.
利用过量的生物污泥用盐酸制备生物絮凝剂。制备的粗生物絮凝剂被纯化并进行分级沉淀，得到四种纯化的污泥生物絮凝剂，分别定义为 PSB1-4。PSB-2 对高岭土悬浮液的絮凝率高于其他絮凝剂。当絮凝体系的 pH 值在 4.0 到 11.0 之间时，PSB-2 的絮凝率均超过 96.0%。X 射线光电子能谱 (XPS) 和傅里叶变换红外 (FTIR) 光谱表明，生物絮凝剂分子中存在氨基和羟基。相对而言，PSB-2 中的生物絮凝剂含有更多的氨基。据信，氨基在絮凝中起着重要作用。ζ 电位测量实验表明，电荷中和有助于絮凝过程。絮凝机理研究表明，污泥生物絮凝剂首先通过电荷中和使高岭土悬浮液不稳定，然后通过吸附和桥联促进悬浮颗粒的聚集。
