应用于道路建设工程的封场垃圾填埋场综合整治案例  

A case study of remediation of closed landfill for road construction

作　　者：蒋良伟 茹凌宇 李蕾[2] 彭韵 王小铭[2] 彭绪亚[2] 朱玉修 JIANG Liangwei;RU Lingyu;LI Lei;PENG Yun;WANG Xiaoming;PENG Xuya;ZHU Yuxiu(Chongqing Municipal and Environmental Sanitation Monitoring Center,Chongqing 401147,China;Key Laboratory of Three Gorges Reservoir Region’s Eco-Environment,Ministry of Education,Chongqing University,Chongqing 400045,China;Chongqing Yuhong Land Development Co.,Ltd.,Chongqing 401120,China)

机构地区：[1]重庆市市政环卫监测中心,重庆401147 [2]重庆大学三峡库区生态环境教育部重点实验室,重庆400045 [3]重庆渝泓土地开发有限公司,重庆401120

出　　处：《环境工程学报》2021年第8期2839-2848,共10页Chinese Journal of Environmental Engineering

基　　金：重庆市市城管科字(2019)第14号;中央高校基本科研业务费(2019CDCGHS307)。

摘　　要：以重庆市九龙坡区科技路尾段二期道路整治工程项目为例,分析了封场后填埋场土地再利用的工程措施及效果。拟建道路穿越了重庆市九龙坡区兴隆垃圾填埋场。通过场地稳定化监测与评估发现,整治区域内垃圾有机质含量低、产气趋于衰竭,但部分区域CH_(4)和H_(2)S含量分别达到66.2%(体积分数)和62.2 mg·m^(-3)(质量浓度),存在气体横向迁移引发燃烧爆炸或影响道路结构的风险,也易造成空气污染。鉴于此,本项目设置帷幕灌浆系统、填埋气主动导排及在线监测系统分别用于填埋气的阻隔、疏导和监测。结果表明,实施帷幕灌浆后,可切断垃圾填埋场与道路间填埋气的横向通道。当监测系统监测到气体浓度超过预设限值(CH_(4)的体积分数>5%,H_(2)S的质量浓度>0.6 mg·m^(-3))时,主动抽气导排系统自动启动,气体浓度可降至报警值以下。因此,联合帷幕灌浆、填埋气主动导排及在线监测技术可实现对填埋气的有效阻隔与控制,实现老龄垃圾填埋场场地的安全利用。Taking the 2 nd stage construction project at the rear of Keji Road in Jiulongpo District of Chongqing as an example, this paper analyzed the utilization effects of the applied engineering measures on closed landfill sites. The proposed road is going to cross Xinglong landfill site in Jiulongpo District, Chongqing. According to the results of site stabilization monitoring and evaluation, the organic matter content of landfilled waste in the reclamation area was low and the gas production tended to be exhausted. However, the methane and hydrogen sulfide content in some regions remained as high as 66.2% and 62.2 mg·m^(-3), respectively, suggesting potential risks of fire and explosion caused by gas migration, affecting road structure or causing air pollution. In view of this, the configuration of curtain grouting, landfill gas venting and online monitoring systems were applied in this project to block, transport and monitor landfill gas. Results showed that the implementation of curtain grouting can effectively cut off the path of gas migration between closed landfill and the proposed road area. In addition, when the gas concentration was detected by the monitoring system exceeding corresponding limitation(methane>5%, hydrogen sulfide>0.6 mg·m^(-3)), gas concentration can be reduced to below the alarming values by the active landfill gas venting system. Therefore, the combination of curtain grouting, landfill gas venting and online monitoring systems can effectively block and control the landfill gas in order for safe utilization of aged landfill sites.

关 键 词：垃圾填埋场 帷幕灌浆 填埋气导排 在线监测 

分 类 号：X703[环境科学与工程—环境工程]