| Groundwater is an irreplaceable resources in people's production and living.The groundwater environment was suffered severe damage due to unreasonable exploitation and human activity.How to protect the groundwater environment,,social and economic development goal is our need to solving problem.In this paper,Taking a chemical plant in Shijiazhuang Wuji county as a research object,the types and characteristics of aquifersin the study area were determined on the basis of groundwater environment present situation investigation and monitoring.The pollution situation and the potential pollution sources distribution of the proposed construction project were analyzed,Finally,the influence of the groundwater pollution of the environment and trends were evaluated on the condition of Sewage treatment station and storage tank area by groundwater numerical simulation.The study of chemical industry project construction on groundwater environment impact provides a theoretical reference.?1?The quaternary aquifers are divided into four aquifers rock group by hydrological geological survey analysis.The aquifer of I+II was unconfined aquifer which distributed into diluvial area.The thickness of the aquifer between 2540m,and the lithology was coarse sand.Most of the I aquifer had drainage,and the II aquifer is the major mining layer;The depth of aquifer floor of III is ranged from350390m,and the thickness of aquifer between 65150m.The unit water flow if III aquifer is between 5070 m3/h·m which belong to feeble confinedwater;The depth of IV aquifer is ranged from 50400m which belong to confined water.The thickness of IV aquifer between 30180m,and the unit water flow if IV aquifer is between 520m3/h·m.?2?The concentration of volatile phenol,cyanide,As,Hg,Cr?VI?,Pb,Cd,Fe,Mn,Cu,total coli,CO32-were notdetected,and the pollutionindex of the pH,KMnO4,NO3-,NO2-,total hardness,TDS,SO42-,F-,NH4+,and Cl-were less than 1 which indicated that the shallow groundwater monitoring water quality meet the groundwater III standard.?3?The coefficient of permeability of the study area were calculated by pumping test which the values ranged from 14.0 m/d to 21 m/d.The surface lithology was miscellaneous fills with the thickness of about 1.0m by hydrological geology drilling and penetration test.Down the layer of miscellaneous fills,there are sitly clay,fine sand,medium sand and coarse sand.The single thickness of clay between 1.02.0 m,more thicker can reach 4.05.0m.The permeability coefficient of clay layer ranged from 3.2×10-44 to 5.6×10-4cm/s.The single thickness of fine sand was less than 1m,and the permeability coefficient ranged from 5.7×10-3to 1.1×10-3cm/s.The single thickness of medium sand was between 0.53.5m,and the permeability coefficient ranged from 1.1×10-33 to 2.8×10-2cm/s.The single thickness of coarse sand was larger than 1.5m,and the permeability coefficient ranged from 2.8×10-2to 5.8×10-2cm/s.The anti-fouling performance was weak of aerationzone in the study area.?4?According to numerical simulation of groundwater,the results are following,when the wastewater treatment station in the factory was leaked scenario,The maximum concentration of KMnO4was 3.34 mg/L,maximum exceed III groundwater standard areas were 2291.09 m2,the largest impact areaswere 12528.40 m2,and influence maximum distance was 106.97 m.After 3000 days of the pollution leakage accident,The exceed standard area of KMnO4 in groundwater is very small;The location of pollutants leak,the maximum concentration of KMnO4 was 3.5 mg/L when the pollutants leak of 100 d,which more than the groundwater III standard,then the concentration of KMnO4 was gradually decreases,and about 300 d,the concentration was decreased blow the III standard.The maximumconcentration of NH4+was 0.52 mg/L,the largest maximum area exceeding III standardwere 190.7 m2,the largest impact area were 13678.94 m2,and the maximum influenced distance was103.88 m.After 500 d of leakage accidents,NH4+in the groundwater is not larger than standard.At the location of pollutants leak,the maximum concentration of NH4+was0.55 mg/L,and then gradually decreasing.There was very small NH4+after 500d.South boundary of the factory,the maximum concentration of NH4+was 0.0015 mg/L on the 1000d.On the aniline tankabnormal condition in the factory scenario,the maximum concentration of aniline was 0.32 mg/L,maximum exceed III standard area were 121.33 m2.the largest impact area were 13578.44 m2,and the maximum influenced distance was 83.78 m.The concentration of aniline was very small after the leakage accident happened 500d. |
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