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Huynh, An The
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Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology

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Study on removal of heavy metals (As, Pb) in agricultural soils using Bidens pilosa L. Huynh, An The; Chen, Yi-Ching
Journal of Degraded and Mining Lands Management Vol. 12 No. 2 (2025)
Publisher : Brawijaya University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15243/jdmlm.2025.122.7063

Abstract

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.
Ecological risk assessment of some heavy metals in sediments in the Dong Nai River section flowing through Binh Duong Province, Vietnam Huynh, An The; Ho, Lien Bich; Nguyen, Tuyet Anh Huynh
Journal of Degraded and Mining Lands Management Vol. 12 No. 2 (2025)
Publisher : Brawijaya University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15243/jdmlm.2025.122.7247

Abstract

This study assessed heavy metal contamination and ecological risk in the sediments of the Dong Nai River section flowing through Binh Duong Province, Vietnam. Four monitoring stations (DN1, DN2, DN3, DN4) were established to analyze the concentrations of heavy metals, including arsenic (As), copper (Cu), zinc (Zn), lead (Pb), cadmium (Cd), and chromium (Cr). The results indicated that the concentrations of heavy metals were generally low and within acceptable limits established by Vietnam national standards (QCVN 43:2012/BTNMT). Notably, chromium and arsenic exhibited the highest concentrations among the metals analyzed. The Degree of Contamination (Cd) across the sampling sites ranged from 1.48 to 1.64, indicating a low level of overall sediment contamination. Correspondingly, the Potential Ecological Risk Index (PERI) values ranged from 5.23 to 6.73, reflecting low ecological risk levels across all monitoring stations. These findings suggest that while the current sediment quality in this section of the Dong Nai River is stable, ongoing monitoring is essential to prevent potential risks associated with heavy metal accumulation, particularly for chromium and arsenic. The study underscores the importance of proactive environmental management to safeguard the aquatic ecosystem against future contamination threats.
Evaluation of the efficiency of a vertical flow constructed wetland combined with a coconut fiber filter for pork slaughterhouse wastewater treatment Ho, Lien Bich; Nguyen, Tuyet Anh Huynh; Huynh, An The
Journal of Degraded and Mining Lands Management Vol. 12 No. 5 (2025)
Publisher : Brawijaya University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15243/jdmlm.2025.125.8913

Abstract

Water pollution is considered a concerning issue in both Vietnam and the world. The cause contributing to water pollution is the impact of animal slaughter activities. Slaughterhouses discharge a large amount of untreated wastewater into the surrounding environment, causing significant degradation of the water environment as well as human health problems. Therefore, it is necessary to treat wastewater from slaughterhouses before discharging it into water sources. The objectives of the study were to determine the quality of wastewater from pork slaughterhouses in Binh Duong and evaluate the effectiveness of a vertical flow constructed wetland combined with a coconut fiber filter for treating this wastewater through the parameters of pH, suspended solid (SS), biology oxygen demand (BOD), chemical oxygen demand (COD), colors, total nitrogen (TN), total phosphorus (TP), and total coliform. The constructed wetland was made of gravel and sand with vertical flow. Vetiver grass (Vetiveria zizanioides (Linn) Nash) was used as the macrophyte. The results showed that, except for pH, all other parameters surveyed from the pork slaughterhouses exceeded the standards QCVN 40:2011/BTNMT (column B). It was observed that increasing the retention time of treatment in the constructed wetland caused an increase in the removal efficiency. The maximum removal efficiency of the treatment system for the parameters SS, BOD5, COD, colors, TN, TP, and total coliform was 96,21%, 83,21%, 89,53%, 95,70%, 81,99%, 97,72%, and 99,99%, respectively. It can be concluded that the combination of a constructed wetland and a coconut fiber filter performed well for the treatment of slaughterhouse wastewater.
Co-Authors Chen, Yi-Ching Ho, Lien Bich Nguyen, Tuyet Anh Huynh