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垃圾填埋场生物覆盖材料筛选及甲烷减排

Keywords: 垃圾填埋,生物覆盖材料,甲烷氧化,渗透性,抗压强度,模拟柱实验

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Abstract:

通过模拟柱实验研究了消化污泥、矿化垃圾和黏土作为垃圾填埋场生物覆盖材料的甲烷氧化能力。3种材料的甲烷日氧化率平均值、总氧化率和氧化速率V(CH4)分别是:消化污泥10.27%、75.82%、1.76mmol/(kg·d);矿化垃圾11.05%、75.61%、2.04mmol/(kg·d);黏土9.05%、68.15%、1.33mmol/(kg·d),消化污泥和矿化垃圾对甲烷的氧化能力均大于黏土。进一步探讨了消化污泥中添加粉煤灰、建筑垃圾和黏土进行改性后对甲烷的氧化能力,考察了改性污泥的渗透系数和抗压强度。结果表明:粉煤灰对消化污泥的改性效果最好,其日氧化率平均值、总氧化率和V(CH4)分别达到17.27%、92.37%和2.35mmol/(kg·d),粉煤灰与消化污泥以1:1~1.5:1混配后可满足填埋场对覆盖材料渗透系数和抗压强度的要求。

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