Study On Adsorption Characteristics Of Organic-mineral Complex For Phosphorus In Black Soil Region In Northeast China

Phosphorus is one of the important limiting factors of water eutrophication, nature of phosphorus discharged into water bodies by agricultural irrigation, domestic wastewater, and other activities, and part of the soluble in water, as well as a large part of sediment adsorbed on sediment adsorption of phosphorus has been some research, but rarely on the sediment organic-inorganic complex on the phosphorus sorption characteristics, especially sediment and the surrounding soil system comparison, and its organic and inorganic fit of phosphorus adsorption thermodynamics and adsorption kinetics point of view to study is very small, black soil in Northeast lakes and reservoirs, Changchun City Xinlicheng Reservoir, for example, the reservoir sediment around the shore of soil organic-inorganic composite phosphorus sorption characteristics and contrast, provide some basis for the eutrophication of lakes and reservoirs, indoor static simulation results show that:Studies have shown that the complex of organic and inorganic sediment on phosphorus adsorption capacity in the adsorption capacity of the soil organic-inorganic composite sediment and surrounding soil particle size complex:different sediment phosphorus adsorption thermodynamics experiments the adsorption volume of the particle size of complexes of phosphorus is greater than the adsorption capacity of the soil of the shore. And thermostat dynamic adsorption process, and impose the increase of phosphorus concentration, the adsorption capacity of each particle size of organic and inorganic complex is gradually increasing, and as time increases, the adsorption capacity has become more and more stable. And Langmuir, and Freundilch equation fitting, to better reflect the characteristics of these samples the adsorption of organic and inorganic complexes. Sediment and soil organic-inorganic composite components are powder smaller amount of adsorption of the phosphorus adsorption capacity of clay and sand, clay is greater than the sand, sediment particle size and shore soil organic and inorganic compound adsorption capacity of the same order of size, silt> clay> sand.Sediments of different grain size and the shore of soil organic and inorganic complexes, the phosphorus adsorption kinetics, reflecting the amount of the organic-inorganic composite body per unit time on the adsorption of phosphorus. Characteristics of sediment and adsorbed phosphorus of the soil organic and inorganic compound, the adsorption capacity of the sediment and soil will increase as time increases and gradually stabilized, this process has two phases, consists of fast adsorption and slow adsorption stage, a relatively short period of Phosphate Adsorption soon, the adsorption capacity is also a great, over a certain period of time, the adsorption capacity of balanced, and the particle-level complex of phosphorus adsorption equilibrium time is almost equal, but the maximum adsorption capacity was of the same, showing that the organic-inorganic composite structure has little effect on the adsorption equilibrium time, a greater impact on the adsorption capacity. Obvious effect of the granularity of the phosphorus adsorption by the soils of different grain size fraction, particle size is finer than the surface area, adsorption point more, the greater the amount of phosphorus sorption showed strong adsorption binding capacity The adsorption saturation is reduced. Different grain size fraction on the overall rate of adsorption of phosphorus decrease with time. Growth over time, the components of the phosphorus adsorption capacity grows.