Xi'an University of Architecture and Technology, No. 13 Yanta Road, Xi'an 710055, China; Institute of Earth Environment, Chinese Academy of Sciences, No. 10 Fenghui South Road, Xi'an 710075, China.
Xi'an University of Architecture and Technology, No. 13 Yanta Road, Xi'an 710055, China.
Bioresour Technol. 2014 Apr;158:201-8. doi: 10.1016/j.biortech.2014.02.002. Epub 2014 Feb 19.
The present study focuses on the effect of poly aluminum chloride (PAC) on the re-formation of aerobic granular sludge after its rupture. The morphological changes, physical characteristics such as SVI, mechanical strength and surface properties of aerobic granular sludge during the re-formation process of broken granules were investigated. Moreover, components (protein (PN), polysaccharides (PS)) and distributions (soluble, loosely-bound (LB), tightly-bound (TB)) of extracellular polymeric substances (EPS) in sludge flocs were taken into consideration. It was found that the effect of charge neutralization and bridging induced by PAC treatment improved the surface properties of sludge, the re-formed granules had a larger size, more compact structure and that the removal performance of pollutants after chemical coagulation had improved. The results of correlation analysis demonstrated that PN in EPS correlated well with the surface characteristics and settling ability of sludge flocs, and PAC treatment strengthened the influence, further accelerated the reformation of granular sludge.
本研究关注聚合氯化铝 (PAC) 对破裂后好氧颗粒污泥再形成的影响。研究了在破碎颗粒的再形成过程中，好氧颗粒污泥的形态变化、SVIs 等物理特性、机械强度和表面特性，同时还考虑了污泥絮体中胞外聚合物物质（EPS）的成分（蛋白质（PN）、多糖（PS））和分布（可溶性、松散结合（LB）、紧密结合（TB））。结果表明，PAC 处理引起的电中和和桥联作用改善了污泥的表面性质，再形成的颗粒具有更大的粒径、更紧凑的结构，并且化学混凝后的污染物去除性能得到了提高。相关性分析的结果表明，EPS 中的 PN 与污泥絮体的表面特性和沉降能力密切相关，PAC 处理增强了这种影响，进一步加速了颗粒污泥的再形成。
