盘锦市X石油化工厂地下水环境影响及预测研究

发布时间：2017-12-31 00:11

本文关键词：盘锦市X石油化工厂地下水环境影响及预测研究　出处：《吉林大学》2017年硕士论文　论文类型：学位论文

【摘要】：本文在收集已有的地质、水文地质相关资料的基础上,开展了资料分析、现场踏勘与调查和环境影响因素识别,对拟建项目厂区及周边相关区域进行1:5万水文地质测绘,并补充必要的勘察试验;开展枯、丰、平水期地下水水位统测和水质监测工作,进行地下水环境现状评价;通过上述工作,查明调查研究区的环境水文地质条件、污染源状况、地下水开采利用现状与规划;并通过建立地下水流数值模型对项目运营期可能发生的风险事故进行污染物运移模拟,结合项目实际提出地下水污染分区防渗措施,同时提出了地下水监测计划及风险事故应急响应措施。通过一系列研究,主要得到以下结论:1、环境水文地质现状根据研究区地下水含水介质、形成条件、赋存特征及其在水平与垂直方向的变化规律,可将其划分为第四系松散岩类孔隙水和新近系孔隙、裂隙层间水两大类型。其中第四系松散岩类孔隙水在平原上部第四系地层广布,为孔隙水赋存的广阔空间,可进一步划分为浅层潜水-微承压水和深层承压水两个亚类,浅层潜水-微承压水含水层岩性主要为中细砂、粉细砂,厚度为32 60m。渗透系数2-5m/d,水位埋深0.4 2.7m,富水性中等,降深5m时,单井涌水量200-1000m3/d;深层承压水含水层广泛分布于浅层水含水层之下,岩性为粉细砂、中细砂、中粗砂、细砂、砂砾石混土等,厚度60-150m,渗透系数0.98-10.01m/d,降深5m时,单井涌水量100-1000 m3/d。本次地下水质量现状评价共设置水质取样点8个,现状评价共选取了25项评价因子,按照丰、平、枯不同水期进行评价,评价结果表明,多数井溶解性总固体、高锰酸盐指数、氯离子和锰超标。硫酸盐、氟化物、氨氮、铁偶有超标,其他特征污染物汞及有毒重金属等未超标。2、地下水环境影响地下水污染预测结果表明,建设项目建设阶段和运行阶段,在正常状况下,建设项目对地下水环境没有明显的影响。本次进行了1种具有较大潜在污染情景下的不同污染物的运移数值模拟,模拟结果显示,在项目服务期内,不会对厂界外水体造成影响;对浅层地下水有一定的影响,影响深度一般只到达30m左右,仅非正常状况下管线破裂时污染物到达含水层较大深处,约60m左右,亦未穿透该浅层含水层,不会对深层地下水造成不利影响。3、地下水环境污染防控措施根据地下水环境影响评价结论,结合项目实际提出了地下水污染分区防渗措施,分别提出了施工期、运营期地下水污染防渗措施,同时提出了地下水监测计划及风险事故应急响应措施,上述措施技术可行、经济合理。
[Abstract]:Based on the existing geological, hydrogeological and related data, the data analysis, field survey and environmental impact factor identification are carried out in this paper. To carry out 1: 50 000 hydrogeological surveying and mapping of the proposed project plant area and its surrounding areas, and to supplement the necessary survey and test; To carry out the groundwater level monitoring and water quality monitoring during the dry, abundant and normal periods to evaluate the groundwater environment; Through the above work, to find out the environmental hydrogeological conditions, pollution sources, groundwater exploitation and utilization status and planning in the investigation and research area; Through establishing the numerical model of groundwater flow, the pollutant transport simulation is carried out on the risk accidents that may occur during the operation period of the project, and combined with the actual situation of the project, the anti-seepage measures of groundwater pollution zonation are put forward. At the same time, the groundwater monitoring plan and emergency response measures are put forward. Through a series of studies, the following conclusions are obtained: 1. The environmental hydrogeological condition is formed according to the groundwater water-bearing medium in the study area. The occurrence characteristics and their changes in horizontal and vertical direction can be divided into Quaternary loose rock pore water and Neogene pore. The pore water of the Quaternary loose rock is widely distributed in the upper Quaternary strata of the plain, which is a wide space of pore water. It can be further divided into two subgroups: shallow phreatic water and micro confined water and deep confined water. The lithology of shallow phreatic micro confined water aquifer is mainly medium fine sand and fine silt. The permeability coefficient is 2 ~ 5 m / d, the water level is 0.4 ~ 2. 7 m, the water level is rich in water, and the depth is 5 m, the water inflow of a single well is 200-1000m3 / d; The deep confined water aquifer is widely distributed under the shallow water aquifer. The lithology of the aquifer is silty sand, medium fine sand, medium coarse sand, fine sand, gravel mixed soil and so on. The thickness of the aquifer is 60-150 m. When the permeability coefficient is 0.98-10.01 m / d and the depth is 5 m, the water inflow of a single well is 100-1000 m3 / d. Eight sampling points have been set up for the present evaluation of groundwater quality. A total of 25 evaluation factors were selected for the present situation evaluation. The results showed that the dissolved total solids, permanganate index, chloride ions and manganese were in excess of the standard. Fluoride, ammonia nitrogen, iron occasionally exceeded the standard, other characteristic pollutants such as mercury and toxic heavy metals do not exceed the standard. 2. The groundwater environment impact groundwater pollution prediction results show that the construction project construction stage and operation stage. Under normal conditions, the construction project has no obvious impact on the groundwater environment. In this paper, the transport of different pollutants under a relatively large potential pollution scenario is simulated, and the simulation results show that. During the service period of the project, it will not affect the water body outside the factory boundary; It has a certain influence on shallow groundwater, the influence depth is only about 30 m, and the pollutant reaches to the deep of aquifer when the pipeline ruptures under abnormal condition, about 60 m. Also did not penetrate the shallow aquifer, will not cause adverse effects on deep groundwater .3. groundwater environmental pollution prevention and control measures based on groundwater environmental impact assessment conclusions. Combined with the actual situation of the project, the anti-seepage measures of groundwater pollution zoning are put forward, and the anti-seepage measures of groundwater pollution during construction period and operation period are put forward respectively, and the groundwater monitoring plan and emergency response measures are also put forward. The above measures are feasible in technology and reasonable in economy.
【学位授予单位】：吉林大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：X82;X523

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