Sustainable Mining and Metallurgy

Weifang is one of the key water-deficient cities in China, water resource is one of the factors limiting the economic development. In order to explore the distribution of local groundwater and water quality, 6 water supply sources were selected as research objects, 55 representative water samples were collected and analyzed the main ion concentration as well as TDS. Piper three-line diagram method and ion ratio coefficient method were used to systematically study the hydro-chemical characteristics and evolution of groundwater. The results show that: ①The cations of groundwater on the east side of Weifang are mainly Ca2+ and Na+, without obvious dominant anions, and the hydrochemistry type was transformed from HCO₃·SO₄·Cl-Ca type to HCO₃·SO₄·Cl-Ca·Na type from south to north. ②Water-rock interaction and evaporation are the main factors controlling the chemical composition of groundwater, and silicate rock and carbonate karst filtration are the main types of water-rock interaction. ③ Ca²⁺ and HCO₃^- in the groundwater of Chijian and Dahuan in Qingzhou mainly come from calcite dissolution, and the dissolution sources of groundwater in this two places are consistent, which may come from the same limestone.