Study on Groundwater Quality Evaluation and Variation of Landfill Site:A Case of Municipal Solid Waste Landfill in Western Yunnan
The study took the groundwater monitoring of a municipal solid waste landfill as an example to comprehensively analyze and valuate the characteristics of groundwater quality so as to provide a scientific basis for the study and judgment of landfill leachate leakage and groundwater pollution.Firstly,the single factor index method was used to calculate the environmental quality of each index,and the water quality pollution items in the water samples of each monitoring point and their pollution multiples exceeding the standard were quantitatively evaluated.On this basis,the comprehensive index F was calculated by Nemerow formula,and the results of qualitative water quality comprehensive evaluation were obtained.Then,water quality trends were analyzed through selecting exceeding item of the representative monitoring points in two years.The results showed that from a total of 8 batches of water quality monitoring data per quarter in 2021 and 2022,the indicators exceeding the standard of groundwater monitoring in 2021 mainly included TH,TDS,CODMn,NH3-N,VP,Cr6+,FCB and Mn.On this basis,the indicators exceeding the standard in 2022 were increased,mainly heavy metal elements.There were some differences in the index of water quality exceeding the standard in the last and the second half of the year,and the index of water quality exceeding the standard in the drainage well restricted the index of water quality exceeding the standard in the diffusion well and the monitoring well.The water quality of the drainage well was very poor all year round,the water quality of the diffusion well was generally poor,and the water quality of the monitoring well fluctuated greatly.CODMn and Cr6+of the three types of monitoring wells showed better coordination,while TH,TDS and NH3-N fluctuations of the drainage Wells were not synchronized with those of the diffusion wells and monitoring wells,and FCB changes did not show regular changes.From the spatial distribution,the water quality of the diffusion well near the drainage well was worse than that of the monitoring well far away from the drainage well.The migration process of different pollutants in landfill leachate may be restricted by geological conditions,groundwater distribution,circulation path and atmospheric precipitation.
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