Analysis of pollution causes and remediation effects of typical karst underground river system
Taking the typical Pingqiao underground river system in karst mountain area as an example,comprehensively analyzes the pollution causes and pollution patterns of the system,and makes an accurate identification of its pollution channels,the characteristics of vertical karst development and water permeability in the polluted passageway area are emphatically studied.The ideas of remediation of groundwater pollution are proposed.The results show that there are three pollution modes in Pingqiao underground river system:intermittent precipitation infiltration,continuous spring runoff infiltration.The pollution channel is located in the east of the waste residue disposal site,and the vertical karst development degree and water permeability are divided into two zones with the elevation of 800 m.After the implementation of the project,the treatment effect is obvious,and the pollutant concentration of the outlet of Pingqiao underground river is reduced by 66％～78％.It is calculated that the annual sewage output of the treatment project is 47 244 m3,the annual reduction of ammonia nitrogen is 16 250 kg,and the reduction of manganese is 10 960 kg.The research results have a certain reference value for the remediation of groundwater pollution in karst mountain areas in southwest China.
underground river systempollution causepollution channelnear source cut-off drainagetreatment effect
NETL
NSTL
万方数据
