NATURE OF ACTIVATED-SLUDGE FLOCS
NATURE OF ACTIVATED-SLUDGE FLOCS
复制标题
DOI：
10.1016/0043-1354(76)90153-6
复制
发表时间：
1976-01-01
期刊：
影响因子：
12.8
通讯作者：
FORSTER, CF
中科院分区：
文献类型：
--
作者：
STEINER, AE;MCLAREN, DA;FORSTER, CF
以前的工作表明，污泥的沉降性能取决于絮凝体表面的化学和物理性质，并且在至少一种情况下，污泥体积指数与污泥颗粒所携带的表面电荷直接相关。这种关系现已被证实为污泥从其他三个工程。这些污泥都有表面的“粘层”，其中含有由中性糖和葡萄糖醛酸组成的多糖。然而，除此之外，还发现了溶菌酶敏感材料，其也有助于颗粒上的总电荷。后一种物质被认为来自死亡的细菌。多价阳离子也被发现参与絮凝体的结构，也有表面电荷的影响。细菌和生物聚合物的阳离子吸附表明，有两种不同类型的吸附行为的活性污泥表面聚合物取决于它是在固态或在溶液中。因此，有人建议，不同的吸附位点可用于阳离子，羧基基团被提议为可溶性聚合物和羟基基团的固体。该吸附数据的意义，通过活性污泥法去除重金属离子进行了讨论。
Previous work has suggested that the settling properties of sludge depend on the chemical and physical nature of the floc surface and that in at least one case the sludge volume index was directly related to the surface charge carried by the sludge particles. This relationship has now been confirmed for sludges from three other works. These sludges all had surface “slime-layers” which contained a polysaccharide composed of neutral sugars and glucuronic acid. In addition to this however, a lysozyme sensitive material was found which also contributed to the overall charge on the particles. This latter material was thought to originate from dead bacteria. Polyvalent cations were also found to be involved in the floc structure and also had an influence on the surface charge. The adsorption of cations by bacteria and biopolymers showed that there were two different types of adsorption behaviour for the activated sludge surface polymer depending on whether it was in the solid state or in solution. It was therefore suggested that different adsorption sites were available to the cations, carboxyl groups being proposed for soluble polymers and hydroxyl groups for the solid. The significance of this adsorption data to the removal of heavy metal ions by the activated sludge process is also discussed.