This paper presents an experimental investigation on the feasibility and effectiveness of an improved method for dewatering sewage sludge (SS) in landfills. Compared with traditional vacuum preloading with prefabricated vertical drains (PVDs), an improved intermittent vacuum loading with wheat straw vertical drains (WSVDs) was developed and a series of laboratory tests were conducted to evaluate the effects of WSVD type and intermittent loading period on the dewatering properties of SS. Tests results showed that the WSVD has a good elastic deformation characteristic during vacuum loading and unloading over PVD. The vacuum degree transmission tests on three types of WSVD showed that 5 cm crushed wheat straw is the optimum one. The surface settlement and water content of SS after the model test are similar for WSVD and PVD in the traditional vacuum consolidation method. There was a significant improvement when applying intermittent vacuum and optimum daily loading time of 10 hours was obtained. The cracks found in the sludge cake around the drainage body using improved method are suggested as the key factor since they are able to improve the vacuum transmission capacity and the permeability of SS. The improved method is expected to offer a feasible and cost-effective way to deal with high water content SS in landfills.

本文提出了一种实验方法，研究一种改进的方法对垃圾填埋场中的污泥进行脱水的可行性和有效性。与传统的垂直预制预制真空吸尘器相比，开发了改进的小麦秸秆垂直排水间歇吸尘器（WSVD），并进行了一系列实验室测试，以评估WSVD类型和间歇加载时间对脱水的影响SS的属性。试验结果表明，在真空加载和卸载过程中，WSVD具有良好的弹性变形特性。对三种WSVD的真空度传递测试表明，5 cm的麦秸秆粉碎是最佳的。在模型试验之后，SSV的表面沉降和水含量与传统真空固结方法中的WSVD和PVD相似。施加间歇真空时有显着改善，并且获得了10小时的最佳每日加载时间。建议使用改进的方法在排水体周围的污泥饼中发现裂缝，因为它们可以提高真空的传递能力和SS的渗透性，这是关键因素。预期该改进方法将提供一种可行且具有成本效益的方式来处理垃圾填埋场中的高含水量SS。建议使用改进的方法在排水体周围的污泥饼中发现的裂纹是关键因素，因为它们能够提高真空传输能力和SS的渗透性。预期该改进方法将提供一种可行且具有成本效益的方式来处理垃圾填埋场中的高含水量SS。建议使用改进的方法在排水体周围的污泥饼中发现的裂纹是关键因素，因为它们能够提高真空传输能力和SS的渗透性。预期该改进方法将提供一种可行且具有成本效益的方式来处理垃圾填埋场中的高含水量SS。