Student Research Reports

View Research Report

This study aims to investigate the physical and chemical quality of groundwater in Ban Suan area, 75/5 Moo 9, Khok Lo Subdistrict, Mueang District, Trang Province, and compare the groundwater quality from sample sources with standard physical and chemical groundwater quality criteria for domestic use. The study examines how soil conditions during the rainy season (September-October) and the dry season (December-January) affect groundwater quality. The study was conducted from September 27, 2024, to January 30, 2025.The results indicate that during the rainy and dry seasons, the average groundwater temperature was 26°C. The average dissolved oxygen levels were 3.75 mg/L and 2 mg/L respectively. The average pH values were 6.39 and 6.73. The average copper concentrations were 1 mg/L and 1.5 mg/L, while the average nitrate concentrations were 0 mg/L and 1 mg/L. The phosphate levels averaged 1.5 mg/L and 0.1 mg/L, and the iron concentrations were 0.5 mg/L and 0.75 mg/L. The soil fertility values (N, P, K) were 2.28 mg/L, 2.50 mg/L, and 4.66 mg/L, respectively. When comparison with the groundwater quality standards set by the Department of Groundwater Resources, the groundwater met the standard criteria. However, groundwater in the dry season exceeded the standard limits for iron and copper. After filtration, the groundwater quality improved to a level suitable for domestic use. It was found that the electrical conductivity (EC) of the soil during the dry season averaged 150 mS/m, a high value that contributed to elevated Fe and Cu levels. This increase was due to the decline in shallow groundwater levels, allowing deeper, more saline groundwater to seep into the shallow aquifer. This was evident from the relatively high salt concentration observed in the dry season.