College of Resources and Environmental Engineering, Key Laboratory of Karst Georesources and Environment, Ministry of Education, Guizhou University, Guiyang 550025, China.
College of Resources and Environmental Engineering, Key Laboratory of Karst Georesources and Environment, Ministry of Education, Guizhou University, Guiyang 550025, China.
Sci Total Environ. 2023 Jan 20;857(Pt 1):159411. doi: 10.1016/j.scitotenv.2022.159411. Epub 2022 Oct 13.
Through the investigation of Qinglong mining area and adjacent karst underground river system, mining activities and water-rock interactions are found to control the hydrogeochemical evolution of karst underground water. Along the flow direction of the karst underground river, the hydro-chemical type is converted from HCO-Ca type to SO-Ca type. The concentrations of Sb and As also gradually decrease. Using PHREEQC to calculate the SI shows that: in the karst underground river system, both gypsum and fluorite are unsaturated, indicating a high degree of water-rock interaction. LogPCO is negatively correlated with pH, indicating that the karst underground river systems are both open systems. The dissolution of carbonate minerals and the alternate adsorption of ions are the main water-rock interactions that lead to the rapid decline of Sb and As concentrations. This research also applies principal component analysis to identify the types of pollution in adjacent karst underground river systems. The results show that the LongBaiwei underground river was mainly affected by coal mining activities, and Fe was more prominent; the ShuiYa underground river was more significantly affected by the leachate from the antimony tailings yard. This study provides a scientific basis for the evolution of the water environment as well as strategies for pollution prevention and control in typical karst underground river systems owing to the influence of mining activities.
通过对青龙矿区及相邻的岩溶地下河系统的调查，发现采矿活动和水岩相互作用控制了岩溶地下水的水文地球化学演化。沿岩溶地下河的水流方向，水化学类型由 HCO-Ca 型转变为 SO-Ca 型。Sb 和 As 的浓度也逐渐降低。利用 PHREEQC 计算 SI 表明：在岩溶地下河系统中，石膏和萤石均不饱和，表明水岩相互作用程度较高。LogPCO 与 pH 值呈负相关，表明岩溶地下河系统均为开放系统。碳酸盐矿物的溶解和离子的交替吸附是导致 Sb 和 As 浓度迅速下降的主要水岩相互作用。本研究还应用主成分分析识别了相邻岩溶地下河系统的污染类型。结果表明，龙摆尾地下河主要受采煤活动影响，Fe 更为突出；水崖地下河受锑尾矿库淋滤液影响更为显著。本研究为典型岩溶地下河系统因采矿活动影响的水环境演化及污染防控策略提供了科学依据。
