钛电极电催化氧化去除源分离尿液中氮的研究

STUDY ON THE REMOVAL OF NITROGEN FROM SOURCE SEPARATED URINE BY ELECTROLYTIC OXIDIZATION USING TITANIUM ELECTRODES

采用表面涂覆有钌铱化合物的钛电极,以模拟尿液的电催化氧化脱氮为研究目的,考查了食盐投加量、电流密度、初始pH对去除效果的影响。结果表明,当极板面积为160cm2、电解溶液为1.0L、电解时间为3h、电流密度为50mA·cm-2、食盐投加量为8g·L-1时,氨氮去除效果最好,为87.81%左右,同时TN的去除率可以达到53.08%;电流密度只有在50mA·cm-2左右时才能有效去除尿液中的氮;初始pH为9左右时有利于TN的去除。利用电催化氧化技术对源分离尿液中的氮在一定程度能够进行去除,但其机理、工艺参数等方面的研究还有待于深入。

The effects of sodium chloride dosing quantity, current density and dilution multiple on the removal of nitrogen from artificial source separated urine by electrolytic oxidization using titanium electrodes coated with ruthenium and iridium （RuO2-IrO2-TiO2/Ti） was investigated. With 160 cm2 total electrode area dipped into 1.0 L urine, the current density 50 mA·cm-2 and the electrolysis time 180 min, 87.81% of ammonia and 53.08% of total nitrogen could be removed from the solution while the sodium chloride dosing quantity was 8 g·L-1. The nitrogen could be effectively removed until current density was controlled at 50 mA·cm-2. The optimal initial pH for the removal of nitrogen was about 9. Conclusion could be made that electrolytic oxidization exhibited the potential to remove nitrogen from source separated urine, but more detail researches should be done to learn the removal mechanism and the operating parameters.