混凝复配剂的制备及其污水处理效果

采用静态实验遴选不同种硅藻土,进而研究其与常用混凝剂的最佳组合及复配比,考察其中几种复配剂在一定条件对城市污水的处理效果。实验结果表明:硅藻土和混凝剂组成的复配剂具有强化混凝作用;氯化铝、硫酸亚铁和高分子絮凝剂与硅藻土分别在1:9,1:11,和1:9的配比时制备复配剂处理生活污水的效果最佳。     

Paleolimnology and diatom flora of the Miocene Quincy Diatomite,Washington, USA

The Quincy Diatomite, central Washington, USA, is a middle Miocene (∼ 15 Ma) lacustrine deposit located between flows of the Columbia River Basalt Group. Two primary localities along the western margin of the deposit are examined for stratigraphic and geographic variation. Three lithologic units are recognized in the deposit and are distinguished by distinct diatom floras and subtle lithologic differences. Diatom assemblages vary geographically along the western margin of the basin. Distinctions between these assemblages are confirmed through analysis of point count data using nonMetric Multidimensional Scaling and cluster analyses. Three stages of lake development, directly influenced by the regional geology and geography, are recognized. The earliest stage was likely deposited in a series of small-interconnected pocket lakes that were eutrophic and slightly alkaline. This lake stage was succeeded by a period of shallower water depth, and dominated by benthic species. The latest stage of the lake is interpreted as representing a deepening and expansion of the lake, based on the dominance of planktonic diatom species. Tectonic uplift of the western Frenchman Hills Anticline combined with overall subsidence of the Quincy Basin during intermediate and late stages of lake development is interpreted to be the driver for relative changes in lake bathymetry.     

一种新型助滤剂在血液制品生产中的应用研究

目的:探讨新型硅藻土用于血液制品组份分离过滤的适用性。方法:对比新型硅藻土与传统硅藻土的电镜扫描物理结构、金属离子含量、比表面积、离心湿密度等物理表征数据,并考察其在血浆蛋白分离阶段各组份过滤效果及最终产品的质量。结果:新型硅藻土与传统硅藻土比较,具有颗粒孔隙致密、金属离子含量低、比表面积大和离心湿密度小的特点;在血浆蛋白分离阶段的过滤过程中,按照传统硅藻土用量的70%左右使用新型硅藻土时,过滤时可得到理想的滤液浊度、较快的过滤速率、更小的过滤压力和均匀的滤饼分布;所得最终产品的质量符合《中国药典》及公司内控标准。结论:新型硅藻土可替代传统硅藻土用于血液制品的规模化生产,同时降低使用量。该应用研究对于降低血液制品的生产成本和提高产品质量具有一定的实际应用价值和参考意义。     

Le bassin lacustre miocène de Bes-Konak (anatolie-turquie): Géologie et introduction a la paléontologie des vertébrés

The tertiary lacustrine and marshy facies ofBes-Konak (Ankara-district) has provided a rich fauna of Vertebrates preserved as molds and casts in Diatomites and volcano-sedimentary beds.In this assemblage are: Cyprinid fishes (Leuciscus(P.) etiliusRückert Ulkümen) with among them a new species of Barbus, some Amphibians both Urodela (mature Triturinae) and Anura (larval forms of Pelobates sp. and mature Rana sp.), a Turtle (Chelydridae-Chelydropsis sp.) a Snake (Colubroïde-Colubridae or Viperidae) and Birds (among them a new species of cormorant).According to the others various data resulting from palaebotanical, palynological and structural investigations, this fauna is clearly suggestive of a lower or middle Miocene deposit. It supports readily the climatic features (local sub-tropical microclimate inside a regional hot-temperate context) as invertebrates, macro and microflora and sedimentology had already shown.Once more, it points out the peculiar trophic type of the limnic area of Bes-Konak and its evolution to a well-marked eutrophic condition.     

Lake circulation and sediment transport in Lake Myvatn

Lake circulation and sediment transport in Lake Myvatn have been calculated using AQUASEA, a numerical model developed by Vatnaskil Consulting Engineers. The goal of the modelling was to calculate changes in sediment transport within the lake due to changes in lake bathymetry caused by diatomite mining. The model uses the Galerkin finite element method and consists of a hydrodynamic flow model and a transport-dispersion model. The flow model is based on the shallow water equations and the wave equation. The transport model is based on the conservation of mass for suspended sediment. The model was calibrated against measurements performed during the summer of 1992. These included measurements of water elevation, current velocity, wave height, and concentration of suspended sediment. After calibration, the model was run for different mining scenarios to determine their impact on the sediment transport in the lake.