The article studies the occurrence of microplastics in the inlet and outlet wastewater streams at wastewater treatment plants in the Saigon-Dong Nai river basin, Vietnam and provide a suitable removal solution. The sampling method is suitable for the actual conditions of Vietnam combined with the application of Fourier-transform infrared spectroscopy to analyze the microplastic composition in the sample. The results show that microplastics exist in many different shapes and colors. Density of microplastics in the inlet stream is from 10.188-15.074 gL -1 . Density of microplastics in the outlet stream is from 0.684-2.107 gL -1 . In which, filaments with an average length of 524.68 μm and an average radius of 100.4 μm; slender form with an average length of 229.49 μm and an average width of 101.3-120.6 μm; granules with an average radius of 113.81μm. The removal efficiency of microplastics in the wastewater stream at the surveyed wastewater treatment plants ranges from 85.4% to 93.7% through the following main processes: pre-settlement, flotation, moving bed biofilm reactor, sedimentation, filtration. Solutions for the removal of microplastics from wastewater treatment plants in the Saigon -Dong Nai river basin were proposed and discussed.
The Groundwater Quality of Tay Ninh province was studied applying monitoring of 24 wells from 2016 to 2019. Based on this research there were determined 8 sites with very bad water quality, mostly due to the low pH index, high iron and ammonium contents. The remaining 16 wells preserve very good water quality. To determine the relationship between Groundwater Quality and peat deposits, the authors studied the map of these deposits in Tay Ninh province and compared it with monitoring points. The results show source of pollution mainly related to peat deposits and human activity. Due to the sustainable development, Tay Ninh province needs planning and the reasonable exploitation of the groundwater in the next 30–50 years, as well as the water resources partition and their management in each district.
In the karst regions of Vietnam, there are many different terrains. The most important one is karst polje. Because there are a lot of residential areas and important economic regions. Based on the study of Geomorphology, geological structure analysis, Geophysics document analysis, and karstification process research at Lang Son karst polje. The author gives conclusions: Lang Son karst polje was formed from the limestone of Bac Son Formation, 700 – 800 m thick. Lang Son karst polje was formed from anticline structure, the limestone of Bac Son Formation that has high karstification level. Lang Son karst polje has only one karst aquifer which is a water supply source for residential areas in Lang Son city. This karst aquifer distributes in limestone blocks of the Bac Son Formation. Geohazards on Lang Son karst polje include collapse, sinkhole, flood, and pollution of water. Among them, the most dangerous one is the collapse of the underground karst caves.
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