城市生活垃圾填埋场稳定化评估

发布时间：2018-02-15 09:33

本文关键词： 城市生活垃圾填埋场稳定化评价指标数值模拟　出处：《浙江大学学报(工学版)》2016年12期 　论文类型：期刊论文

【摘要】：建立城市生活垃圾填埋场稳定化评价指标体系,包括垃圾降解、产气潜力释放以及堆体沉降稳定.基于填埋场降解-固结-溶质迁移耦合模型,提出取样测试与数值模拟结合的填埋场稳定化评估方法;将此方法应用于西安江村沟填埋场.结果表明,我国典型高厨余垃圾含量填埋场的稳定化过程分为3阶段.快速降解阶段:垃圾纤维素/木质素迅速下降,沉降明显;慢速降解阶段:垃圾水解及填埋气产生速率明显降低,沉降速率缓慢;达到稳定化阶段后,纤维素/木质素变化非常缓慢,大部分产气潜力完成释放,沉降基本完成.3个评价指标变化过程存在差异,降解稳定化指标是其中最主要的评价指标.根据分析结果建议运营管理中采用渗滤液回灌调节堆体降解环境以避免酸化抑制,稳定甲烷化阶段初期做好临时覆盖提高填埋气收集效率,封场作业应选择在沉降速率较低时进行.
[Abstract]:An evaluation index system for the stabilization of municipal solid waste landfills was established, including the degradation of municipal solid waste, the release of gas production potential and the stability of heap settlement, based on the coupled model of degradation, consolidation and solute transport in the landfill. A new method of landfill stabilization evaluation combined with sampling test and numerical simulation is put forward, and the method is applied to Xi'an Jiangcuanggou landfill. The results show that, The stabilization process of typical landfills with high kitchen waste content in China is divided into three stages: rapid degradation stage: waste cellulose / lignin decreases rapidly, sedimentation is obvious, slow degradation stage: refuse hydrolysis and landfill gas production rate decrease obviously. After reaching the stabilization stage, the change of cellulose / lignin was very slow, most of the gas production potential was released, and the sedimentation was basically completed. According to the analysis results, the leachate recharge should be used to regulate the degradation environment of the reactor in order to avoid acidification inhibition. In the early stage of stable methanation, the temporary cover should be made to improve the landfill gas collection efficiency, and the sealing operation should be carried out when the sedimentation rate is low.
【作者单位】：浙江大学岩土工程研究所;浙江大学软弱土与环境土工教育部重点实验室;浙江大学建筑设计研究院有限公司;
【基金】：国家“973”重点基础研究发展规划资助项目(2012CB719800)
【分类号】：X799.3

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