Research Particularity On Organo-mineral Complex With Different Sizes Of Ammonia Nitrogen Adsorption-desorption In Sediment Of YiTong River

Sediment pollution of water was a major environmental problem in the world. The sediment was research ed as the object of ammonia nitrogen in the sediment of the adsorption-desorption behavior of a systematic exposition of the progress, ammonia nitrogen adsorption-desorption in different size sediments extracted organo-mineral complex of characteristics and influencing factors was revealed in experimental studies.Ammonia solution in different concentrations was adsorbed in organo-mineral complex of different size in the sediment, in the same environmental conditions, the organo-mineral complex on the strength of ammonia adsorption capacity was refleced.The size of organo-mineral complex was smaller, its adsorption capacity was greater, particle size of organo-mineral complex was 0.001-0.005mm, its adsorption amount of ammonia nitrogen was significantly higher than the other three particle sizes, particle size of organo-mineral complex was 0.05-0.25mm, its the adsorption of ammonia nitrogen was the least, indicating that particle size was larger, the adsorption capacity was weaker,the different sections of organo-mineral complex were shown the law in the sediment of Yitong River.Organic matter on adsorption ammonia nitrogen in different size of organo-mineral complex, the impact of variable charge in soils mainly from organic matter, and large amounts of negative charge was contained in humus, negative charge in the soil surface had a greater contribution, therefore, more negatively charged was contained in smaller particle size of the complex, they played a decisive role in the adsorption. Smaller size, higher organic matter content, the stronger of the adsorption capacity on the negative charge.Ammonia nitrogen desorption in different sections of organo-mineral complex was increased with increasing concentration inYitong river, at a concentration of 0.001-0.005mol/L range, the desorption amount of ammonia nitrogen was rised rapidly,at a concentration of 0.005-0.026mol/L range, desorption was rised more slowly. In each size, the size was larger, the desorption was higher, particle size of the larger adsorption capacity, the desorption was lower. The size of complex was 0.05-0.25mm,its desorption of ammonia nitrogen was the most, and desorption of ammonia nitrogen was showed a good linear relationship.Desorption of ammonia nitrogen was affectted by organic matter in complex, it was major factor.The content of organic matter was lower, the adsorption binding energy of complex was smaller than the rate of desorption was higher.At different conditions of pH values, organo-mineral complex of different sections in sediment of Yitong river, the adsorption of ammonia nitrogen in organo-mineral complex was higher with the gradually increased of pH value, particle size was 0.001-0.005mm in complex,its adsorption was higher than other particle size, when the pH value to the range of 8 to 12, the fastest adsorption rate of ammonia nitrogen. In pH, and the adsorption of ammonia nitrogen in different particle size of complex was showed a good correlation, and complex differences in adsorption rate and variable negative charge had the larger relationship between a permanent and negative charge.Desorption amount of ammonia nitrogen in different particle size of complex was increased with the increasing of pH value, particle size was 0.001-0.005mm in complex,its adsorption was the highest, but the desorption was much less than other particle size, the adsorption performance of complex was stronger,but its desorption performance was weaker, so the desorption was decreased with the decreasing of particle size. Different sections of the complex were shown above the desorption regularity in sediment.The adsorption of ammonia nitrogen in organo-mineral complex, the adsorption isotherms were Freundlich and adsorption isotherm model was the best, followed by adsorption isotherm was Herry-type, Langmuir isotherm type was less, good simulation was presented for different sections of organo-mineral complex.In the kinetic experiments of the adsorption, the four equations fit the dominant effect of the order, first-order equation was obvious, Elovich equation and dual constant equation was the second than first-order equation, diffusion equation was poor, so first-order equation was the optimal equation.