Study on migration characteristics of chromium contaminated site and Dual-Frequency IP method monitoring technology
-
摘要: 重金属铬污染场迁移过程受多种不确定因素影响,其迁移特性和监测过程很难通过实验进行研究。依据地下水流动基本规律和污染物迁移机理,采用COMSOL软件仿真分析静储量铬污染源的迁移特性及其变化规律。通过开展静态土槽物理模型实验,验证数值正演模拟的可靠性和准确性。以迁移模型为监测基础模型,采用中梯剖面和对称四极测深装置,对铬污染场迁移过程进行双频激电法监测数值正演模拟,分析平整、起伏地形和测点方位布置对监测效果的影响。结果表明:在铬污染物迁移过程中,高渗透系数的透水层对重污染区域表现出强烈的吸附效应,同时会在短时间内加剧污染区域的横向扩散;在视幅频率峰值和视电阻率谷值的异常对应关系上剖面探测要优于测深探测;对称四极测深时,在污染场的投影边缘中央设置测点可更有效地提高测量精度;在进行剖面和测深探测时,山谷会造成激电曲线出现“多峰”现象;在凸起山峰两侧山陲设置供电电极,通过视幅频率和视电阻率曲线可综合确定重度污染区域的具体位置。研究成果丰富了双频激电法对重金属土壤污染场监测的理论,为铬污染场实时监测提供理论依据和技术指导,对推动生态环境保护具有积极意义。Abstract: In view of the fact that the migration process of chromium contaminated sites can be affected by a variety of uncertainties, its migration characteristics and monitoring process are difficult to study experimentally. Based on the basic law of groundwater flow and the migration mechanism of pollutants, COMSOL software was used to simulate and analyze the migration characteristics of chromium contaminants in static reserves and their changing rules. The reliability and accuracy of numerical forward simulations are verified by conducting physical modeling experiments of static earth tanks. The chromium pollution source migration model is used as the basic model for geoelectric monitoring. Based on the theory of dual-frequency induced polarization(IP) method, the intermediate gradient detection device and symmetrical quadrupole sounding device are used for pollution source migration monitoring to analyze the influence of terrain undulation and the orientation of the measurement point on the monitoring effect. The results show that during the migration of chromium pollutants, the permeable layer with a high permeability coefficient shows a strong adsorption effect on the heavily polluted area, and at the same time, it will intensify the lateral spreading of polluted areas in a short period of time. Correspondence of excitation anomalies between the peak apparent amplitude frequency and the trough of apparent resistivity is better for profiling than for bathymetric surveys. For symmetrical quadrupole sounding, a measuring point in the center of the projected edge of the contaminated field allows for more effective contamination monitoring. The presence of valleys may trigger "multiple peaks" in the excitation curve during profiling and bathymetric soundings. By setting up power supply electrodes on the mountain frontiers on both sides of the raised peaks and comprehensively mapping the apparent amplitude frequency and apparent resistivity curves of the chromium contamination field, whcih is effective in determining the exact location of the heavily contaminated area. The research results enrich the theory of monitoring heavy metal soil pollution field by dual-frequency IP method, whcih promote the ecological environmental protection.
-
-
[1] ZHITKOVICH A. Chromium in drinking water:Sources,metabolism,and cancer risks[J]. Chemical Research in Toxicology,2011,24(10):1617-1629.
[2] 于皓,安益君,金德才,等. 铬污染对土壤细菌群落结构及其构建机制的影响[J]. 环境科学,2021,42(3):1197-1204. YU Hao,AN Yijun,JIN Decai,et al. Effects of chromium pollution on soil bacterial community structure and assembly processes[J]. Environmental Science,2021,42(3):1197-1204.
[3] BREGNBAK D,JOHANSEN J D,JELLESEN M S,et al. Chromium allergy and dermatitis:Prevalence and main findings[J]. Contact Dermatitis,2015,73(5):261-280.
[4] MORETTO A. Hexavalent and trivalent chromium in leather:What should be done?[J]. Regulatory Toxicology and Pharmacology,2015,73(2):681-686.
[5] ZHANG Xuhui,ZHANG Xuan,WANG Xuchu,et al. Chronic occupational exposure to hexavalent chromium causes DNA damage in electroplating workers[J]. BMC Public Health,2011,11:224.
[6] 王甜甜,靳德武,杨建. 内蒙古某矿矿井水重金属污染特征及来源分析[J]. 煤田地质与勘探,2021,49(5):45-51. WANG Tiantian,JIN Dewu,YANG Jian. Heavy metal pollution characteristics and source analysis of water drainage from a mine in Inner Mongolia[J]. Coal Geology & Exploration,2021,49(5):45-51.
[7] 吴健生,宋静,郑茂坤,等. 土壤重金属全量监测方法研究进展[J]. 东北农业大学学报,2011,42(5):133-139. WU Jiansheng,SONG Jing,ZHENG Maokun,et al. Review of methods for monitoring soil heavy metal concentrations[J]. Journal of Northeast Agricultural University,2011,42(5):133-139.
[8] 刘宗辉,谭海涛,刘毛毛,等. 锌污染土探地雷达频散衰减特性与正演模拟研究[J]. 地球物理学进展,2022,37(5):2180-2187. LIU Zonghui,TAN Haitao,LIU Maomao,et al. Study on dispersion attenuation characteristics of ground penetrating radar reflected wave in zinc contaminated soil[J]. Progress in Geophysics,2022,37(5):2180-2187.
[9] 任滨. 浅谈瞬变电磁物探法在矿产资源调查中的应用[J]. 世界有色金属,2022(10):140-142. REN Bin. Application of transient electromagnetic geophysical method in mineral resources investigation[J]. Geological Prospecting,2022(10):140-142.
[10] 王军,程久龙,黄忠正,等. 矿井瞬变电磁法探测顶板低阻岩层富水性[J]. 矿业安全与环保,2023,50(1):76-81. WANG Jun,CHENG Jiulong,HUANG Zhongzheng,et al. Mine transient electromagnetic method in detecting the water abundance of rock strata with low resistance in roof[J]. Mining Safety & Environmental Protection,2023,50(1):76-81.
[11] 强建科,何继善. 椭球体上双频激电法的正演与反演算法[J]. 中南大学学报(自然科学版),2007,38(6):1199-1205. QIANG Jianke,HE Jishan. Algorithm of forward and inversion of dual-frequency induced polarization method on elliptical sphere[J]. Journal of Central South University (Science and Technology),2007,38(6):1199-1205.
[12] 何继善. 双频道交流激发极化法初步研究[J]. 中南矿冶学院学报,1978(2):1-11. HE Jishan. Preliminary study on dual channel AC induced polarization method[J]. Journal of Central South College of Mining and Metallurgy,1978(2):1-11.
[13] 刘志民,韩雷,张伟杰,等. 坑道聚焦双频激电法探测技术[J]. 煤炭学报,2016,41(12):3086-3094. LIU Zhimin,HAN Lei,ZHANG Weijie,et al. Research on the detection technology of focusing dual-frequency induced polarization method in tunnel[J]. Journal of China Coal Society,2016,41(12):3086-3094.
[14] 刘志民,韩雷,张伟杰,等. 煤巷多点电流源双频激电法超前扫描探测技术[J]. 煤田地质与勘探,2017,45(4):149-156. LIU Zhimin,HAN Lei,ZHANG Weijie,et al. Study on advanced scanning detection technology of dual-frequency induced polarization method with multi-point current sources in coal mine roadway[J]. Coal Geology & Exploration,2017,45(4):149-156.
[15] 刘志民,孟彩茹,李冰,等. 煤巷聚焦多点电源探测电场超前扫描控制策略[J]. 煤田地质与勘探,2019,47(3):195-200. LIU Zhimin,MENG Cairu,LI Bing,et al. Detection electric field control strategy for advanced scanning detection of focusing multipoint current sources in coal mine roadway[J]. Coal Geology & Exploration,2019,47(3):195-200.
[16] 张杰. 铬土壤重金属污染场激电法探测正反演研究[D]. 邯郸: 河北工程大学, 2021. ZHANG Jie. Forward and inversion study of induced polarization method for detection of Cr heavy metal pollution soil[D]. Handan: Hebei University of Engineering, 2021. [17] REN Zhengyong,TANG Jingtian. 3D direct current resistivity modeling with unstructured mesh by adaptive finite-element method[J]. Geophysics,2010,75(1):7-17.
[18] 焦芳芳,马振民,侯玉松. 焦作地区浅层地下水铬(Ⅵ)污染机理及迁移预测[J]. 煤田地质与勘探,2014,42(6):82-86. JIAO Fangfang,MA Zhenmin,HOU Yusong. Pollution mechanism and migration prediction of Cr (VI) in shallow groundwater in Jiaozuo area[J]. Coal Geology & Exploration,2014,42(6):82-86.
[19] KUMAR M,SOK R,KNACKSTEDT M A,et al. Mapping 3D pore scale fluid distributions:How rock resistivity is influenced by wettability and saturation history[J]. Petrophysics,2010,51(2):102-117.
[20] MELO L B B,SILVA B M,PEIXOTO D S,et al. Effect of compaction on the relationship between electrical resistivity and soil water content in Oxisol[J]. Soil and Tillage Research,2021,208:104876.
[21] 王超,徐杨青,高晓耕. 岩石电阻率特性及在煤矿采空区探查中的应用[J]. 煤炭工程,2020,52(11):64-69. WANG Chao,XU Yangqing,GAO Xiaogeng. Rock resistivity characteristics and its application in coal mine goaf exploration[J]. Coal Engineering,2020,52(11):64-69.
[22] 孙亚坤,能昌信,刘玉强,等. 铬污染土壤电阻率特性及其影响因素研究[J]. 环境科学学报,2011,31(9):1992-1998. SUN Yakun,NAI Changxin,LIU Yuqiang,et al. Investigation on the electrical resistivity of chromium contaminated soil[J]. Acta Scientiae Circumstantiae,2011,31(9):1992-1998.
[23] 骆彬,张平松,胡雄武. 矿井坑道音频电法超前探测模拟及其应用[J]. 中国煤炭,2018,44(5):27-31. LUO Bin,ZHANG Pingsong,HU Xiongwu. Simulation and application of audio electric advanced detection method in mine tunnel[J]. China Coal,2018,44(5):27-31.
[24] 刘豪睿,孙亚坤,能昌信,等. 铬污染土壤复电阻率频散特性[J]. 物探与化探,2010,34(3):372-375. LIU Haorui,SUN Yakun,NAI Changxin,et al. The complex dispersion properties of the chrome contain in a ted soil[J]. Geophysical and Geochemical Exploration,2010,34(3):372-375.
[25] 王春光,彭景颂,李婉莹,等. 黄河中游重要生产煤矿山土壤重金属特征分析与评价[J]. 地球物理学进展,2022,49(5):124-130. WANG Chunguang,PENG Jingsong,LI Wanying,et al. The analysis and evaluation on the features of the heavy metals in coal mining soil in the middle reaches of the Yellow River[J]. Mining Safety & Environmental Protection,2022,49(5):124-130.
[26] 秦飞,赵明亮,李庆华,等. 对称四极测深AB/2距的有效探测深度改算模型[J]. 四川地质学报,2018,38(2):325-327. QIN Fei,ZHAO Mingliang,LI Qinghua,et al. Calculating model for effective detection depth of symmetric four-pole sounding[J]. Acta Geologica Sichuan,2018,38(2):325-327.