Recent Progress on Biosorption of Heavy Metals from Liquids Using Low Cost Biosorbents: Characterization,Biosorption Parameters and Mechanism Studies

A significant number of biosorption studies on the removal of heavy metal from aqueous solutions have been conducted worldwide. Nearly all of them have been directed towards optimizing biosorption parameters to obtain the highest removal efficiency while the rest of them are concerned with the biosorption mechanism. Combinations of FTIR, SEM‐EDX, TEM as well as classical methods such as titrations are extremely useful in determining the main processes on the surfaces of biosorbents. Diverse functional groups represented by carboxyl, hydroxyl, sulfate and amino groups play significant roles in the biosorption process. Solution pH normally has a large impact on biosorption performance. In brief, ion exchange and complexation can be pointed out as the most prevalent mechanisms for the biosorption of most heavy metals.     

SEDIMENT BUDGET OF THE ILLINOIS RIVER

1 BACKGROUND The Illinois River is the most significant river in the state of Illinois. The river drains nearly half of the state and has a drainage area of 28,906 mi2 (74,867 km2). Except for about a 4,000 mi2 (10,360 km2) area in Indiana and Wisconsin, the watershed is located in Illinois (see Fig. 1). The watershed contains the drainage basins of several of the state's significant rivers such as the Sangamon, LaMoine, Spoon, Mackinaw, Vermilion, Fox, Kankakee, and Des Plaines Ri…     

Visual ModFlow数值模拟在陕化新开水源地勘察中的应用

陕化需水量不断增加,原水源地已不能满足用水要求,需要寻找新的水源地。新开水源地开采井位于遇仙河和石堤河之间,渭河大堤以南200m左右。本文对新开水源地建立了水文地质概念模型,并运用目前国际通用的可视标准软件Visual ModFlow对勘察区地下水进行了数值模拟计算和预测,得出了该区在多年平均降水量的条件下,新增加的开采量主要靠渭河激发补给和蒸发量减少的结论。     

SEDIMENTATION, RIVER GEOMETRY, AND BANK EROSION OF THE KANKAKEE RIVER IN ILLINOIS AND INDIANA

1 BACKGROUND The Kankakee River, which straddles the States of Indiana and Illinois in the Midwest, is shown in Fig. 1. This figure also shows the dividing line between these two states and the streamgaging and few sediment gaging stations in the basin. The main stem of the river in Indiana was channelized, thus bypassing numerous oxbows, meanders, side channels, etc., that existed before the 1890s. Before channelization in Indiana, the river essentially flowed through a wetland/mar…