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在中试条件下,考察了地下水中二价锰离子(Mn~(2+))对成熟石英砂表面滤膜去除氨氮(NH+4-N)的影响。结果表明,当进水Mn~(2+)浓度不大于3.5 mg·L~(-1)时,NH+4-N去除率随进水Mn~(2+)浓度增大而增大。相应地,Mn~(2+)的存在使得进水NH+4-N的浓度上限由2.51 mg·L~(-1)提高到2.83 mg·L~(-1),且NH+4-N和Mn~(2+)可实现同步去除。此外,进水Mn~(2+)的存在((2.1±0.1)mg·L~(-1))使得去除NH+4-N所需要的温度下降,这说明Mn~(2+)对石英砂表面复合氧化膜催化NH+4-N氧化具有一定的促进作用,从而提高了NH+4-N在滤柱中的去除速率。
Under pilot-scale conditions, the effects of divalent manganese ions (Mn 2+) in groundwater on ammonia nitrogen removal (NH + 4-N) from the surface of the mature quartz sand were investigated. The results showed that when the concentration of Mn 2+ in the influent was not more than 3.5 mg · L -1, the removal rate of NH 4 + -N increased with the increase of the concentration of Mn 2+ in the influent. Correspondingly, the upper limit of NH + 4-N concentration in influent was increased from 2.51 mg · L -1 to 2.83 mg · L -1 due to the presence of Mn 2+, and NH + 4-N And Mn ~ (2+) can be removed simultaneously. In addition, the presence of Mn 2+ in the influent ((2.1 ± 0.1) mg · L -1) decreased the temperature required for the removal of NH + 4-N, indicating that Mn 2+ Sand composite oxide film catalytic NH + 4-N oxidation has a certain role in promoting, thereby increasing the NH + 4-N in the filter column removal rate.