中文摘要：

泥沙絮凝是黏性泥沙动力学中的一个重要课题,相关的研究主要关注于各种有机絮凝和无机絮凝的形成机理、影响因素、泥沙物理化学条件等方面.但近几十年,泥沙的生物絮凝逐渐引起更多的关注,大多数研究集中在各种生物学因子和沉积学因子之间的相互关系.本文借助于最新发展的研究工具和相关的显微镜方法来桥连生物絮凝泥沙中泥沙颗粒和微生物活动及其代谢产物生物膜之间的关系,以利于更好地理解聚合物质生物膜在微絮凝结构及其外部絮凝行为中的作用.研究表明,生物絮凝泥沙包含了复杂的生物膜网络,呈现出复杂的絮凝结构.生物膜覆盖泥沙表面充斥于颗粒孔隙之中,在生物絮凝中起到主要的桥连作用,并对生物絮凝泥沙的表面形貌、结构特征、力学性质等产生重要影响.

英文摘要：

Sediment flocculation is very important for cohesive sediment dynamics. The referred studies have traditionally been devoted to all kinds of organic-flocculation and inorganic-flocculation, including the forming mechanism, influencing factors and physical/chemical sediment conditions, and so on. However, the biofloc- eulation of sediment induced by biological activity has attracted more and more attention over the last decades. Most studies have focused on the interrelation between biological and sedimentological variables. This paper u- ses a newly developed field kit and correlative microscopy to bridge the resolution gap between sediment parti- cles and biological activities as well as its metabolic products-biofilm, so as to better understand the role of polymeric material biofilm in floc ultrastructure and outward flocculation behavior of bio-flocculation sediment. It showed that bio-flocculation sediment was composed of complex networks of biofilm and appeared to be of complicated physical floceulation structures. The biofilm embedded particles and permeated the void space, representing the dominant physical bridging mechanism of the sediment flocculation and contributed to the ex- tensive surface area, architecture characteristics and mechanical properties.