Original Articles
Yimei Ying and Chunhong Xu
Abstract
The Yellow River which flows through several provinces is an important water source in North China. With the rapid development of cities along the Yellow River, arsenic pollutants which were discharged from chemical, textile, glass, leather industries polluted the water and destroyed the ecological environment. The adsorption of sediment on arsenic pollutants depends on many factors, such as sediment composition, sediment concentration, sediment grain size, temperature, pH value, adsorption time, etc. In order to research of the sediment environment, preservation the water quality and protection of ecological environment, study on various factors of arsenic adsorption by sediment in the Yellow River is very necessary. The adsorption characteristics of sediment on arsenic were obtained in the hydrostatic and dynamic adsorption experiments. The main results are as follows. ①The adsorption can reach equilibrium in 5 minutes when the sediment concentration is below 200kg/m3. ②During the same concentration conditions, the rule of adsorption amount is fine sand > medium sand > coarse Sand. ③A logarithmic growth trend of adsorption amount is obtained with the increasing of sediment concentration in the hydrostatic and hydrodynamic conditions.④15~20kg/m3 is a very important cut-off point in the adsorption by coarse sediment.⑤The adsorption rate is higher in hydrodynamic condition than in hydrostatic condition.