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《Environmental Science & Technology》 2009-02
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Recovery of High Concentration Ammonia Nitrogen in Rare Earth Ammonia Sulfate Wastewater

CHEN Li-rong, WU Wen-fei, DAI Bao-cheng (School of Energy and Environment Engineering,Inner Mongolia University of Science and Technology,Baotou 014010,China)  
Sedimentation and blow-off method were used to treat rare earth ammonia sulfate wastewater and recover ammonia nitrogen. Results showed that hardness can be decreased to 91.8% and pH improved to 12.1 by adding amount of 7.7gCaO into wastewater of 1t. Removal efficiency of ammonia nitrogen in the first blow-off treatment was 97% under the condition of pH 12,blow-off time 3h and gas-liquid ratio 6,000. Removal efficiency of ammonia nitrogen in the second blow-off treatment was 86.2% under the condition of pH 11.3,blow-off time 2h and gas-liquid ratio 4,000. The effluent can meet national discharge standard. In the blow -off treatment of 1t wastewater,17.39g ammonia sulfate were made by absorbing with sulfuric acid.
【Fund】: 内蒙古科技大学校内基金资助项目(00810508);; 内蒙古高等学校科研项目(NGJY07100)
【CateGory Index】: X703
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