Antimony Pollution And Remediation In Water And Soil Environment Of Antimony Mining Area

China is the largest antimony producer in the world,accounting for 90%of the world’s antimony production.Antimony deposits are mainly distributed in Guangxi,Guizhou,Yunnan and Hunan.The antimony mines in Guizhou province have a history of more than 100 years of mining.However,the mining and smelting of antimony has caused antimony pollutants compounds to be released into the environment,causing serious pollution to the surrounding water and soil environment,which needs to be remedied and treated urgently.This article takes the antimony mining areas in Dushan county and Qinglong county of Guizhou province as the research object,studies the distribution of metal pollution in the soil of the antimony mining area,uses the geo-accumulation index method to assess the degree of pollution,analyzes the metal hazards of the soil environment around the mining area,and focuses on the research Remediation research is carried out on the pollution status of the district.According to the water and soil pollution in the study area,indoor potted experiments were carried out,using Chenopodium ambrosioides L.to remedy Sb pollution in the soil;Usingβ-Fe OOH loaded PTFE membrane to treat Sb containing wastewater.The main conclusions are as follows:（1）Analysis of 19 metals in samples of slag,soil,water,etc.from antimony mining areas in Dushan county and Qinglong county found that the 7 metals（Sb,As,Cd,Mo,Ag,Zn）in the soil of Dushan county exceeded the soil background value of Guizhou province,and Sb is the main pollutants,up to 28.3 mg/kg,which is 12.6 times the background value（2.24 mg/kg）.The 9 metals（Sb,As,Mo,Ag,Zn,Cu,Sc,Sr,Nb）in the soil of Qinglong county exceeded the soil background value of Guizhou province,and Sb is the main pollutants,with the highest concentration reaching 920 mg/kg,which is 410.7 times the background value（2.24 mg/kg）.The evaluation results of the geo-accumulation index method show that the farmland in Dushan county study area is moderately contaminated by Sb,Cd and Zn,and slightly contaminated by Ag and Pb.The farmland in the Qinglong county study area is heavily contaminated by Sb,and slightly contaminated by As,Mo,Cu,Nb and Sr.In addition,compared with"Surface Water Environmental Quality Standard"（GB3838-2002）and"Integrated Wastewater Discharge Standard"（GB8978-1996）,the water environment in the study area is mainly contaminated by Sb.（2）The pot experiment showed that when Sb≤250 mg/kg,the biomass of Chenopodium ambrosioides L.had no significant change compared with the control,and when Sb≥500 mg/kg its biomass was significantly reduced compared with the control.The Sb uptake of the roots,stems,leaves and fruits of Chenopodium ambrosioides L.increased significantly with the increase of soil Sb concentration.The Sb absorption of the roots of Chenopodium ambrosioides L.is the largest,which is the main part of Chenopodium ambrosioides L.to accumulate Sb,and the absorption reaches the maximum（161.38 mg/kg）when Sb=1000 mg/kg.In different treatment groups,the bioconcentration coefficient BCF and transfer coefficient TF of Chenopodium ambrosioides L.were both less than 1,and they decreased significantly with the increase of Sb concentration in the soil,the ability of its roots to accumulate Sb is significantly increased,and its ability to transfer Sb in plant is significantly reduced,indicating that Chenopodium ambrosioides L.is a root-hoarding plant of Sb,and has a certain ability to remedy and tolerate Sb acceptability.The DGT analysis show that there is a good correlation between the Sb concentration extracted by DGT and the Sb concentration absorbed by Chenopodium ambrosioides L.,it shows that DGT is a better method for evaluating the bioavailability of Sb in the soil.The analysis of soil microorganisms found that with the increase of Sb concentration,the number of OTU of soil microorganisms increased,the microbial community diversity of rhizosphere soil decreased significantly,and the microbial community diversity of non-rhizosphere soil increased significantly.（3）The performance ofβ-Fe OOH PTFE membrane modified by PDA-PEI co-deposition to remove Sb is stronger than that ofβ-Fe OOH PTFE membrane modified by tannic acid（TA）-PEI co-deposition.After Fe Cl₃·6H₂O solution mineralization,aβ-Fe OOH loaded PTFE membrane is obtained,and its performance in removing Sb metal is stronger than that before mineralization.In addition,theβ-Fe OOH modified PTFE membrane induced by the PDA-PEI system has the best effect in removing Sb in wastewater.The cumulative adsorption of Sb in water within 2h reaches 2011.39 mg/g,which has high efficiency,low cost and no secondary Pollution and other advantages.