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《Journal of University of Science and Technology Beijing》 2006-03
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Crystallization and flotation mechanism of ammonia precipitates formed in wastewater

SUN Tichang CUI Zhiguang KOU Jue LI Fengbo Civil and Environmental Engineering School,University of Science and Technology Beijing,Beijing 100083,China  
Simulated wastewater and the wastewater from a coke-making factory were used to investi- gate the crystallization and flotation mechanism of precipitates formed in the precipitation of ammonia nitro- gen in wastewater.The results obtained by X-ray diffraction show that the precipitates formed in simulated wastewater are non-crystalline,but the precipitates formed in coke-making wastewater are crystalline.In- frared spectrum results show that the pH value at which the flotation of precipitates is carried out influences the mechanism between precipitates and collectors used for flotation of precipitates.The collectors,dode- canoic acid and sodium oleate,physically adsorb on the surface of precipitates at pH 9,but chemical adsorp- tion of the collectors takes place on the surface of precipitates at pH 11.Dodecanoic acid is the best collector for the precipitates formed in simulated wastewater but the best collector for the precipitates formed in coke- making wastewater is sodium oleate because of different crystallization states in different wastewaters.
【Fund】: 国家自然科学基金(No.50374006)
【CateGory Index】: X703
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