昆明湖沉积物的组成和理化性质的粒度响应

文章采用扫描电镜、激光粒度仪、X-射线衍射光谱仪,全谱直读ICP发射光谱仪等现代大型仪器鉴定和常规化学分析技术,对不同筛分粒径下昆明湖沉积物颗粒的组成、形貌及物理化学性质进行了综合分析.结果表明,昆明湖沉积物颗粒主要以粉粒和黏粒为主,具有晶体结构,平均粒径为22.37-160.17 μm;呈现不规则的块、片状形貌,表面...     

Monitoring of Distribution Water Qualities Under Various Source Water Blending

The main goal of this large-scale pilot distribution study was to systematically investigate the impacts of blending different source waters on distribution water qualities. The principal source waters investigated were conventionally treated ground water (G1), surface water processed by enhanced treatment (S1), and desalted seawater by reverse osmosis membranes (RO). Due to the nature of raw water quality and associated treatment processes, G1 water had high alkalinity, while S1 and RO sources were characterized as high sulfate and high chloride waters, respectively. One year of pilot pipe study demonstrated that water quality was significantly deteriorated by increased color when source water blends with characteristics different from historic groundwater were introduced to pipe distribution systems. Elevated color was associated with release of iron corrosion products, mainly from aged unlined cast iron pipes. Iron release increased significantly when exposed to RO and S1 waters: that is, the greater iron release was experienced with alkalinity reduced below the background of G1 water. Lead and copper release to water, on the other hand, enhanced with the application of RO and G1 waters, respectively.