基于产气模型对填埋场垃圾产气速率与气压的估算

通过建立垃圾产气模型,估算衰减期填埋场垃圾产气速率;结合渗透系数推算填埋场内气压。结果表明,衰减期填埋场产气速率由于温度不同,变化范围为0.12×10~(-9)~1 466.67×10~(-9)m~3·kg~(-1)·s~(-1)。在假设条件下,衰减期填埋场内气压根据压实度及温度条件不同,变化范围为0.092 6~50 490.078 9 Pa;填埋场内产生的填埋气优先横向迁移,当横向迁移受阻或内部压力过大时,才纵向迁移至填埋场表面。通过静态箱采样不能准确分析填埋场表面CH_4释放情况,应同时对填埋场的集气管进行采样观测。

Estimation of Biogas Production Rate and Pressure in Landfill based on Biogas Production Model

The landfill biogas production rate at senescence phase was estimated by biogas production model. The pressure in landfill can be estimated by biogas production rate combines with air permeability. The results showed that: The biogas production rate in landfill at senescence phase changed at different temperature, the variation range was between 0.12·10-9 and 1466.67·10-9m3·kg-1·s-1. Under the assumption, pressure in landfill would also change at different temperature; the variation range was between 0.0926 and 50490.0789Pa. So landfill gas in landfill would move lateral first, when the lateral movement was prevented , landfill gas could move up to the surface of landfill.