改性粉煤灰对垃圾渗滤液中氨氮的吸附影响

The Adsorbability of Ammonia Nitrogen from Landfill Leachate with Modified Fly Ash

摘要: 采用溶胶–凝胶法改性粉煤灰，并在500℃下煅烧消除残余有机物。通过改性粉煤灰处理淮南市垃圾渗滤液脱氮效率的研究，从而为去除垃圾渗滤液中的NH⁺₄-N提供了一个有效的方法。通过垃圾填埋场渗滤液的吸附实验，发现pH值接近中性，改性粉煤灰投加量为3 g/L，低浓度垃圾渗滤液中的NH⁺₄-N去除率接近100%；垃圾渗滤液NH⁺₄-N的初始浓度为16 mg/L时NH⁺₄-N去除率为80.24%。结果表明，改性粉煤灰的吸附性能较好。

Abstract: Fly ash was modified by sol-gel method, and calcined at 500˚C to remove the residual organic matter. Through the study of NH⁺₄-N removal efficiency in the treatment of landfill leachate of Huainan city with modified fly ash, an efficient way was provided to remove NH⁺₄-N in landfill leachate. Through the absorption experiment of landfill leachate, it found that pH is close to neutral, the dosing quantity of modified fly ash is 3.0 g/L, the removal rate of NH⁺₄-N in landfill leachate under the low concentration is close to 100%; Initial concentration of NH⁺₄-N in waste leachate is 16 mg/L, the NH⁺₄-N removal rate was 80.24%. It shows that the adsorption performance of modified fly ash is better.