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《Journal of University of Science and Technology Beijing》 2004-01
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Factors Influencing Ammonia Nitrogen Precipitation from Simulated Wastewater

SUN Tichang, ZHANG Jianyun, SONG Quayuan Department of Environmental Engineering, University of Science and Technology Beijing, Beijing 100083, China  
In the laboratory and with a simulated wastewater as samples, the factors influencing the precipitation of ammonia nitrogen from wastewater were investigated with MgCl2 and Na2HPO4 as precipitants. These factors studied include the pH of precipitation, the dosage of precipitants, and the initial NH4+-N concentration of waste-water. The result shows that the pH of precipitation is the key factor and it determines the precipitation rate of NH4+-N, the remaining concentration, the removal rate and the remaining concentration of Mg2+and PO43-. The optimum pH is 11. When the initial NH4+-N concentration is less than 1 000 mg/L, both the precipitation rate and the residual concentration of NH4+-N decrease with decreasing the initial concentration. When the initial NH4+-N concentration is less than 100 mg/L, the precipitation rate decreases dramatically, but the minimum residual concentration is 5 mg/L and remaining the same.
【Fund】: 国家自然科学基金资助项目(No.50374006)
【CateGory Index】: X703
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