Geochemical Interpretation of Iron / Manganese Release in Groundwater – Example of Loung Te Industrial Park

• Main Authors: SU, YU-HSIEN, 蘇育賢
• Other Authors: 江漢全
• Format: Others
• Language: zh-TW
• Published: 2019
• Online Access: http://ndltd.ncl.edu.tw/handle/842cdt

碩士 === 國立宜蘭大學 === 環境工程學系碩士班 === 107 === Groundwater is often used as a source of water for people's livelihood, agriculture and aquaculture, and in most areas where tap water is not available, groundwater is also used as a source for drinking. Therefore, the quality of groundwater is one of the factors to be considered in the utilization of groundwater resources. Generally speaking, groundwater has a wide range of usage. However, the quality of water required varies according to different uses of groundwater. In this study, environmental monitoring survey was carried out according to the environmental impact statement. In the groundwater monitoring data of the past three years, the iron/manganese content is on the high side. The measured values of iron and manganese exceed the monitoring standards of groundwater pollution (1.5 mg/L) and groundwater pollution (0.25 mg/L). Groundwater is one of the most important water resources in Yilan, and its water level is high, which is beneficial to people's utilization. On the contrary, when surface pollution sources occur, pollutants are easy to leach into groundwater. In view of this, this study will explore the sources and causes of iron/manganese in groundwater in this area. Through the graphic method of groundwater quality comprehensive index, such as Piper diagram and Stiff diagram. Understanding the current groundwater quality of monitoring wells in the factory area, then using groundwater hydrochemical simulation. Potential precipitation and dissolution trends of various mineral phases in groundwater are analyzed. The release of iron/manganese from groundwater in the plant area was studied and the conceptual model of iron/manganese content in groundwater in the plant area was developed. The contents of iron, manganese and ammonia nitrogen were higher in the study area. It is speculated that the mechanism may be that rainwater passes through groundwater aquifers. It makes groundwater pH decrease and oxygen deficit, and then causes reductive dissolution of iron and manganese oxides or hydroxides under reduction condition. As a result of the release of ferrous iron or manganese, the concentration of iron/manganese in groundwater increases.