A Study on Water Quality from Land Uses in Bueng Khong Long Wetland, Bueng Kan Province

Abstract

This research aimed to study the water quality in Bueng Khong Long Wetlands,
Bueng Kan Province affected by land use.  Sampling points for surface water selected from different land use areas in five different locations such as reserved area, community area, water conservation area, water quality measurement area and recreational area. Water samples were collected eight times, once per months over a period of eight months from May to December 2020. The results demonstrated that all five water sampling areas between May to December, the pH was in the range of 5.85±0.04 to 8.56±0.01 in surface water standards type 2, 3 and 4. Total dissolved solids (TDS) were in the range of 10.00±0.00 mg/l to 35.33±0.32 mg/l. Dissolved oxygen (DO) was in the range of 4.18±0.01 mg/l to 8.79±0.02 mg/l in surface water standards type 2 and 3. The biochemical oxygen demand (BOD) was in the range of 1.55±0.15 mg/l to 13.15±0.05 mg/l in surface water standards type 3, 4 and 5. The ammonium nitrogen was in the range of 0.007±0.006 mg/l to 0.055±0.005 mg/l in surface water standards type 2. Total kjedahl nitrogen (TNK) was in the range of 0.22±0.00 mg/l to 0.95±0.11 mg/l. Total coliform bacteria (TCB) value in ranged of less than 3 MPN/100 ml to 93.0 MPN/100 ml in surface water standards type 2. The fecal coliform bacteria (FCB) values in the range of less than 3 MPN/100 ml to 21.0 MPN/100 ml in surface water standards type 2. The water quality index (WQI) in Bueng Khong Long Wetlands of the five land use areas found that the score was in the range of 58.14 to 88.39, in the water quality index criteria were fair to good. The water quality index in May was in good quality. The water quality indexes from June to September were in fair to good quality. While the water quality indexes from October to December were in fair quality. Overall, land use areas in reserved area, community area, water conservation area, water quality measurement area and recreational area were found that the water quality index were in fair to good quality. It can be concluded that in surface water standards type 2 and 3.