Field air permeability and hydraulic conductivity of landfilled municipal solid waste in China.
Field air permeability and hydraulic conductivity of landfilled municipal solid waste in China.
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DOI：
10.1016/j.jenvman.2011.12.008
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发表时间：
2012-05
影响因子：
8.7
通讯作者：
Huayong Wu;Tan Chen;Hongtao Wang;Wenjing Lu
中科院分区：
文献类型：
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作者：
Huayong Wu;Tan Chen;Hongtao Wang;Wenjing Lu
利用空气和水进行可持续填埋的就地处理系统的成功设计和运行受到缺乏对填埋的城市固体废物(MSW)的现场空气渗透性和水力传导性等关键参数的了解的限制。本工作提供了在北京某垃圾填埋场进行短期注气和注水试验所获得的现场透气性Ka值和渗透系数Kuof MSW的数据。Ka值和Ku值分别在1.2x×10−13−1.9x×10−12m2和5.9x×10−7−7.2×10−6m与S−1的范围内。随着填埋深度的增加，由于覆盖层压力的增加和垃圾在深层的细小颗粒，Ka值和Ku值均显著降低，导致垃圾的孔隙度较低。深层较高的水分饱和度也是导致ka下降的原因。为了比较空气和水的渗透性，根据估算的kwd计算了水的渗透率kw，发现在同一层中废物的透水率大约比相应的kAf小三个数量级。Kwt和kam的差异可能是由于空气的相对渗透率、空气的潜在短路和沼气的活跃生产，这破坏了kww和ka之间的关系。因此，为了成功地设计和运行垃圾填埋场中的空气和水添加系统，现场测量空气渗透性和水力传导性是必不可少的。
The successful design and operation of in situ treatment systems using air and water additions for sustainable landfilling are constrained by a lack of knowledge of the key parameters, such as field air permeability and hydraulic conductivity of landfilled municipal solid waste (MSW). This work provides data on the field air permeability kaand hydraulic conductivity Kwof MSW obtained by conducting short-term air and water injection tests at a landfill in Beijing, China. The kaand Kwvalues are found to in the range of 1.2 × 10−13−1.9 × 10−12m2and 5.9 × 10−7−7.2 × 10−6m s−1, respectively. Both kaand Kwdecreased significantly with landfill depth due to the increase in overburden pressure and the finer particles of the waste in deeper layers, leading to a lower porosity of waste. The higher moisture saturation in the deeper layers also contributed to the decrease in ka. To compare the permeability with respect to air and water, the water permeability kwwas calculated based on the estimated Kwand was found to be approximately three orders of magnitude smaller than the corresponding kafor waste at the same layer. The differences in kwand kamay be due to the relative air permeability, the potential short-circuiting of air and active production of biogas, which undermine the relationship between kwand ka. Therefore, to successfully design and operate air and water addition systems in a landfill, in situ measurements of the air permeability and hydraulic conductivity are essential.