Method and Practice of Efficient Drainage of Leachate from Landfill with High Kitchen Waste in China
Aiming at the issues of high leachate yield,inadequate drainage,liquid level buildup,and pile instability caused by high kitchen waste landfill,an efficient leachate drainage design method was proposed.This method involves calculating leachate yield accurately and monitoring the liquid level of the pile in operating landfills.Stability calculations were conducted to determine the liquid level control target and the corresponding targeted leachate drainage volume,matching large-diameter pumping shafts,long horizontal drainage blind trenches along the slope,and short blind trenches at the foot of the slope.This approach was applied to the Xingfeng landfill site in Guangzhou.A design was implemented using 144 large-diameter pumping shafts,185 long horizontal drainage blind trenches along the slope,and 40 short blind trenches at the foot of the slope,aiming for a targeted leachate drainage volume of 104 940 m3 within 45 days and a liquid level reduction target of 3.0 meters.After the implementation of the drainage project,the main liquid level at the top of the pile decreased by approximately 6.3 m over three months.On the south slope,the main liquid level decreased by about 1.0 meter to 3.0 meters within 40 days and by about 1.0 meter to 6.0 meters over ten months.The safety factor of top-cut sliding failure mode increased by 0.2,reaching a critical stable state of 1.0,and the overall stability safety factor increased by 0.4,exceeding 1.6,satisfying the regulatory requirement of CJJ 176-2012 Technical Code for Geotechnical Engineering of Municipal Solid Waste Sanitary Landfill.
high kitchen wasteleachate leveltarget drainage volumeefficient drainage
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