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Effects of Sediment Particle Size on Phosphate Adsorption Characteristics in the Lake Wuliangsuhai

Author: GaoMin
Tutor: ZhangSheng
School: Inner Mongolia Agricultural University
Course: Hydrology and Water Resources
Keywords: Lake Wuliangsuhai Surface sediments Adsorption Grain Size Effect
CLC: X13
Type: Master's thesis
Year: 2011
Downloads: 45
Quote: 0
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Abstract


Lake eutrophication has become one of the global ecological and environmental problems facing the water , phosphorus is the controlling lake eutrophication nutrient elements , dynamic migration conversion exist in the overlying water and under cover Sediments , studies show a lot of factors that affect the migration of phosphorus in the water-sediment interface between the conversion process , including differences in sediment grain size showed phosphorus adsorption characteristics directly affect the migration of phosphorus in water and sediment interface conversion process . Phosphorus adsorption characteristics of depth cognitive the Lake Wuliangsuhai sediments granularity effect , divided into four particle size range of the Lake Wuliangsuhai surface sediments by sieving : less than 63μm , ??63 - 125μm ,125 - 250μm greater than 250μm, different size sediment adsorption kinetics and adsorption isotherm test results showed that the total nitrogen and total phosphorus adsorption granularity effect is more obvious , the contribution rate of the fractions of total phosphorus adsorption capacity and quality percentage jointly controlled 0 ~ 45min of the beginning of the trial , the various fractions adsorption rate and adsorption of different grain size sediment phosphorus obvious effect of particle size , adsorption capacity, adsorption rate and adsorption efficiency were shown with the particle size decreases trend. Phosphorus adsorption process test data analysis found that , in high concentrations , the sediment the phosphorus adsorption kinetics and adsorption isotherm process and the second-order equation and the Langmuir model fitting , in low concentrations , sediment phosphate adsorption the ( or desorption amount ) and showed a good linear relationship between the initial concentration and equilibrium concentration . The test results also show that the The sediment phosphorus adsorption is an endothermic reaction , the temperature rises , is conducive to the adsorption of the sediment on the adsorption of phosphorus sediment phosphorus , as well as by the impact of environmental pH values ??, strong acid conditions , sediment phosphorus the amount of adsorption is small increments with increasing pH .

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CLC: > Environmental science, safety science > The basic theory for the Environment and Science > Environmental Chemistry
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