SIMULATION ON TRANSPORT OF GROUNDWATER POLLUTANTS AFTER CLOSURE OF A LANDFILL IN CHONGQING BASED ON VISUAL MODFLOW
-
摘要: 垃圾填埋场作为潜在的地下水污染源,在封场后渗滤液仍可能泄漏对周边地下水造成极大的污染风险,因此,研究填埋场渗滤液泄漏后污染物运移规律对于填埋场封场后的管理和地下水污染监测具有重要意义。 基于Visual Modflow 软件建立水流和溶质运移模型,仅考虑填埋区底部长期连续泄漏这一非正常工况,对生活填埋场典型污染物(COD)的运移扩散规律进行预测。 结果表明:研究区地下水流向从北向南流动,COD泄漏后向下游方向运移;填埋区底部长期连续泄漏使污染羽的扩散范围、距离、最大浓度不断增大,到3650 d时已经超出研究区边界,对右侧的CY河造成污染,因此发现泄漏后一定要及时采取有效措施,如气相抽提、PRB技术等,避免污染物继续运移扩散;必须加强填埋场及其周边地下水的监测工作,定期检查维护地下水监测井,建立合理的应急响应机制。
-
关键词:
- 生活垃圾填埋场 /
- 地下水 /
- VisualModflow /
- 数值模拟 /
- COD
Abstract: As a potential source of groundwater pollution, landfill sites may still cause significant pollution risks to surrounding groundwater due to leachate leakage after closure. Therefore, studying the pollutant transport patterns after leachate leakage in landfill sites is of great significance for managing landfill sites after closure and monitoring groundwater pollution. In this paper, we established a water flow and solute transport model based on Visual Modflow, considering only the abnormal condition of long-term continuous leakage at the bottom of a landfill site, to predict the transport and diffusion laws of typical pollutants (COD) in domestic landfills. The research results indicate that the groundwater flow in the study area flows from north to south, and COD leaks and then migrates downstream; the long-term continuous leakage at the bottom of the landfill area continuously increases the diffusion range, distance, and maximum concentration of the pollution plume. By the 3650th day, it has exceeded the boundary of the research area, causing pollution to the CY River on the right side. Therefore, after discovering the leakage, it is necessary to take effective measures promptly, such as gas phase extraction, PRB technology, etc., to avoid the continued migration and diffusion of pollutants; it is necessary to strengthen the monitoring of groundwater in the landfill and its surrounding areas, regularly inspect and maintain groundwater monitoring wells, and establish a reasonable emergency response mechanism.-
Key words:
- landfill /
- groundwater /
- Visual Modflow /
- numerical simulation /
- COD
-
[1] 盛欣宇.重庆市某垃圾填埋场地下水污染物迁移模拟及修复实验研究[D].重庆:重庆交通大学,2020. [2] 石立明.地下水数值模拟的研究与应用进展[J].科技视界,2019(20):123-124. [3] 高靖勋,地下水数值模拟的研究进展[J].科技资讯,2019,17(3):88-89,91. [4] 廖镭,张涵,郭珊珊.简易垃圾填埋场渗滤液地下水溶质运移数值模拟[J].安全与环境工程,2019,26(2):76-83. [5] 邢丽娜.基于Visual Modflow的某生活垃圾填埋场地下水污染物运移模拟[J].城市地质,2020,15(2):166-172. [6] 孙禄健,马佳,王宏伟,等.基于Visual Modflow的填埋场地下水污染迁移研究:以河北省保定市某飞灰填埋场为例[J].四川环境,2022,41(6):12-17. [7] KANMANI S, GANDHIMATHI R, SHANMUHARAJAN M B, et al. Leachate transport phenomenon on groundwater quality: modeling using modflow and MT3DMS tools[J]. Global Nest Journal,2023, 25(3):44-55. [8] 中国国家标准化委员会.地下水质量标准:GB/T 14848—2017[S].北京:中国标准出版社,2017. [9] 徐颖,张溪,邰姗姗,等.废弃氟化工园区地下水污染特征及污染物扩散模拟研究[J].中国资源综合利用,2022,40(8):144-147. [10] HUO S L, XI B D, YU H C, et al.Characteristics of dissolved organic matter(DOM) in leachate with different landfill ages[J].Journal of Environmental Sciences,2008,4:492-498. [11] GELHAR L W, WELTY C, REHFELDT K R.A critical review of data onfield scale dispersion in aquifers[J].Water Resources Research,1992,28(7):1955-1974.
点击查看大图
计量
- 文章访问数: 104
- HTML全文浏览量: 8
- PDF下载量: 11
- 被引次数: 0