In order to explore the status of sulfide in the groundwater monitoring wells in Tianjin,a study was conducted to characterize the evolution of sulfide and its causes based on the water sample detection data of 309 monitoring wells in the city.On the basis of hydrochemical statistical analysis and correlation analysis,combined with the comparative analysis of groundwater quality between the monitoring wells and the aquifers and pumping tests,the characteristics and causes of different sulfides exceeding the standard were identified.The results show that the over-standard rate of sulfide in the monitoring wells is consistent with the depth of the monitoring wells,and the source of sulfide is related to the corrosion of seamless steel pipe.Sulfur precipitated during well pipe corrosion is reduced to sulfide by Sulphur Reducing Bacteria(S0RB)and enters the water the monitoring wells,resulting in elevated sulfide concentrations.The concentration of sulfide in the water can be reduced by pumping,and the sampling time should be prolonged and the amount of pumping should be increased as much as possible.This study can provide a reliable reference for determining the reasonable pumping time and pumping quantity of water quality monitoring wells and the safety of groundwater supply.
国家科技期刊平台
NSTL
维普
万方数据
