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Active metal oxides phosphorus immobilization further experimental study

Author: LuoFang
Tutor: JiangYingXiang
School: Kunming University of Science and Technology
Course: Environmental Science
Keywords: La2O3 phosphorous removal agent immobilization electrodeposition phosphorus removal rate
CLC: X52
Type: Master's thesis
Year: 2010
Downloads: 39
Quote: 0
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Abstract


Water eutrophication is greatly influenced by phosphorus. The thesis begins with how to best recover phosphorus removal agent, using the vacuum principle to recycle water phosphorus and achieve the regeneration of lanthanum oxide and phosphorus recovery. Immobilize alloy through electrodeposition to attain better efficiency of phosphorus removal agent.Lanthanum regeneration experiment completed in a vacuum furnace and the experimental temperature is:300～1500℃. The phosphate lanthanum powder was thermal decomposition in a vacuum furnace after pressed into tablet, and the thermal decomposition sample was tested by X-ray fluorescence diffraction to obtain the contents of various elements and their oxides of the sample. As the quality of lanthanum oxide of the sample can not change before and after thermal decomposition, the removal rate of phosphorus oxide and carbon oxide can be further calculated, finally at 1500℃, the maximum removal rate of phosphorus oxide and carbon oxides, were 33.46% and 71.31%, respectively.The main factors of alloy electrodeposition single-factor experiments were mole ratio, electrodeposition time, current intensity, temperature. It can be concluded, in the factor of electrodeposition time of ferrous chloride, when the molar ratio of lanthanum chloride and ferrous chloride solution was 10:1, the highest phosphorus removal rate of 87.8% arrived at the 40th min; in the factor of the electrodeposition time of lanthanum chloride, when the molar ratio of lanthanum chloride and ferrous chloride solution was 2:1, the highest phosphorus removal rate of 85.4% arrived at the 30th min; in the factor of temperature, when the molar ratio of lanthanum chloride and ferrous chloride solution was 2:1 and the current strength was 40mA, the highest phosphorus removal rate of 83.3% arrived at 55℃; in the factor of current strength, when the molar ratio of lanthanum chloride and ferrous chloride solution was 10:1, the highest phosphorus removal rate of 84.3% arrived at 60mA.Alloy Electrodeposition orthogonal experiment chose L9 (34), the optimal orthogonal experimental combination is A1B2C1D1, namely,10:1 of the molar ratio of lanthanum chloride and ferrous chloride solution; firstly 30min of the electrodeposition time of ferrous chloride, and then 30min of the electrodeposition time of lanthanum chloride,65℃of the temperature,60mA of the current strength.

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CLC: > Environmental science, safety science > Environmental pollution and its prevention > Water pollution and its control
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