The aim of this research was to determine whether water hyacinth can be used to remove heavy metals, such as cadmium, arsenic, lead, zinc, and copper, from industrial wastewater. Investigations of the pollution removal or prevention potential of aquatic macrophytes, such as heavy metal bio-indicators in aquatic habitats, can prove to be advanced field studies. Water hyacinth is one of the aquatic plant species that has been effectively utilized for the treatment of wastewater. It is extremely effective in removing stains, suspended solids, BOD, organic matter, and heavy metals. This research focused on the use of water hyacinth to treat wastewater from heavy metals. Water hyacinths can grow in sewage, absorbing and digesting contaminants and transforming sewage effluents into comparatively clean water in the process. As a result, the plants have the potential to be used as natural water purification systems at a fraction of the cost of a standard sewage treatment facility. The experiment was performed using healthy, young, and acclimatized water hyacinths. Containment water with a cadmium concentration of 0.5 mg/L, arsenic concentration of 0.5 mg/L, lead concentration of 2 mg/L, zinc concentration of 5 mg/L, and copper concentration of 5 mg/L was added to five different polyethylene pots with 100 g of water hyacinth in each pot. After 30 days, the removal efficiency for heavy metals (Cd, As, Pb, Zn, and Cu) reached 59–92%, and the results were within the permitted limits according to the National Technical Regulation on Industrial Wastewater in Vietnam. Based on this information, it is possible to deduce that water hyacinth can be utilized to remove cadmium, arsenic, lead, zinc, and copper from industrial wastewater effluents efficiently.

The Song Be River is a vital water source in Binh Duong Province, Vietnam, playing a crucial role in supplying water for domestic use and agriculture, as well as supporting local ecosystems. However, due to the recent rapid economic and industrial growth, the river’s water quality has encountered significant challenges, particularly from the improper discharge of untreated wastewater from various sources and activities. This study conducts a comprehensive analysis of the Song Be River’s water quality by employing the Water Quality Index (WQI) in conjunction with Geographic Information System (GIS) technology. Subsequently, several strategies are also proposed to effectively manage and enhance the water quality of the Song Be River. Over the period from March 2023 to March 2024, 52 samples were collected from four monitoring points (SB1, SB2, SB3, and SB4) along the Song Be River, with a frequency of once per month. All analytical parameters (such as NH₄ ⁺_N: 0.01–0.61 mg l⁻¹, NO₂ ⁻_N: 0.014–0.03 mg l⁻¹, Fe: 0.01–0.81 mg l⁻¹, Chemical Oxygen Demand (COD): 4–26 mg l⁻¹, Dessolved Oxygen (DO): 3.8–6.6 mg l⁻¹, Suspendid Solids (SS): 5–69 mg l⁻¹, Coliform: 1200–4300 MPN/100 ml, Total phosphorous: 0.01–0.08 mg l⁻¹ and Total nitrogen: 1.16–4.5 mg l⁻¹) fell within the permissible limits according to the Vietnamese National Standards. Furthermore, the WQI ranged from 73 to 100, indicating that the water quality of The Song Be River is good and suitable for domestic use.

This study evaluates the potential of calcined oyster and clam shells as low-cost materials for the removal of heavy metal ions Pb2+, Cd2+, and Cu2+ in aqueous solutions. The materials were collected, cleaned, and calcined at 700 °C to produce carbon monoxide (CaO)-rich materials. Material...

This study aimed to evaluate the treatment performance of a compact integrated Anoxic–Aerotank–Membrane Bioreactor (MBR) system designed for decentralized domestic wastewater treatment in a university campus environment. The experimental system was installed at Thu Dau Mot University...

This study aimed to assess the capacity of Bidens pilosa L. to absorb heavy metals, specifically arsenic (As) and lead (Pb), in contaminated soil environments, with the goal of laying a foundation for applying phytoremediation techniques to remediate agricultural soils polluted with heavy metals in Vietnam. The findings indicate that B. pilosa L. can thrive in soils contaminated with heavy metals at concentrations up to 700 mg/kg. Additionally, the absorption rates in the roots, stems, and leaves of B. pilosa L. were substantial. At a concentration of 700 mg/kg As, the absorption rates were 66.53% in roots, 20.45% in stems, and 13.03% in leaves. For Pb, at the same concentration, the absorption was 64.41% in roots, 21.27% in stems, and 14.32% in leaves. Moreover, the bioconcentration factor (BCF) and translocation factor (TF) further support the plant's potential. The BCF for As decreased from 0.123 at 0 mg/kg to 0.023 at 700 mg/kg, while the BCF for Pb showed a similar trend, ranging from 0.017 to 0.023 across increasing concentrations. The TF for As dropped from 1.202 at 100 mg/kg to 0.503 at 700 mg/kg, while the TF for Pb ranged from 0.959 to 0.552, indicating limited translocation of metals from roots to aerial parts at higher contamination levels. These results suggest that B. pilosa L. is a promising candidate for phytoremediation of soils contaminated with arsenic and lead, thanks to its ability to accumulate these metals predominantly in its roots, thereby limiting their movement to stems and leaves.