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Mangrove forests are important in providing habitats for complex communities of terrestrial and marine fauna. Moreover, they are recognized as highly productive ecosystems in providing nutrients to mangrove food webs or exporting them to nearby coastal waters. In the present study, stable isotopes of carbon and nitrogen were applied to examine the changes in the diets of benthic invertebrate communities following mangrove restoration. The isotope signature of invertebrate tissues varied among the forest ages and locations and ranged from 3.7 ± 1.0 to 13.9 ± 1.1‰ and −26.6 ± 0.5 to −15.0 ± 0.4‰ for δ15N and δ13C, respectively. The results showed that the food source assimilation of macro-invertebrates is slightly altered from a mixture of benthic microalgae and marine phytoplankton in the mudflat to a combination of benthic microalgae and sediment organic matter in the Sonneratia caseolaris and the Kandelia obovata forests. Therefore, the diets of macro-invertebrates varied following forest ages and the position of the forest in the intertidal zone. These insights from the present study are useful for the effective conservation and restoration of mangrove forests in Vietnam and worldwide.
Pham Van Hieu; Nguyen Thi Hoang Ha; Luu Viet Dung; Koji Omori. Carbon Sources Supporting Macro-Invertebrate Communities in Restored Mangrove Forests from Hau Loc, Thanh Hoa, Vietnam. Journal of Marine Science and Engineering 2020, 8, 651 .
AMA StylePham Van Hieu, Nguyen Thi Hoang Ha, Luu Viet Dung, Koji Omori. Carbon Sources Supporting Macro-Invertebrate Communities in Restored Mangrove Forests from Hau Loc, Thanh Hoa, Vietnam. Journal of Marine Science and Engineering. 2020; 8 (9):651.
Chicago/Turabian StylePham Van Hieu; Nguyen Thi Hoang Ha; Luu Viet Dung; Koji Omori. 2020. "Carbon Sources Supporting Macro-Invertebrate Communities in Restored Mangrove Forests from Hau Loc, Thanh Hoa, Vietnam." Journal of Marine Science and Engineering 8, no. 9: 651.
This study was conducted to assess the removal of arsenic (As) and heavy metals from mining wastewater by the combination of adsorption, using modified iron-ore drainage sludge, and horizontal-subsurface-flow constructed wetland with common reed (Phragmites australis). The pilot-scale experiment with a constant flow rate of 5 m3/day was operated for four months using real wastewater from a Pb–Zn mine in northern Vietnam. Atomic absorption spectroscopy was used for elemental analysis in wastewater and plant. X-ray diffraction (XRD), surface charge measurements (by a particle charge detector (PCD)), Fourier-transform infrared (FTIR), and surface area Brunauer–Emmet–Teller (BET) measurements were performed to determine the characteristics of the adsorbent. The results showed that the average removals of As, Mn, Cd, Zn, and Pb by the combined system with limestone substrate during four months were 80.3%, 96.9%, 79.6%, 52.9%, and 38.7%, respectively. The use of another constructed wetland substrate, laterite, demonstrated better removal efficiency of As than limestone. The concentrations of As and heavy metals in the effluent were lower than the limits established by the QCVN 40:2011/BTNMT for industrial wastewater, which indicated the feasibility of combining adsorption and constructed wetland for the treatment of mining wastewater.
Ha T. H. Nguyen; Bien Q. Nguyen; Thuy T. Duong; Anh T. K. Bui; Hang T. A. Nguyen; Ha T. Cao; Nhuan T. Mai; Khai M. Nguyen; Nguyen Thi Hoang Ha; Kyoung-Woong Kim. Pilot-Scale Removal of Arsenic and Heavy Metals from Mining Wastewater Using Adsorption Combined with Constructed Wetland. Minerals 2019, 9, 379 .
AMA StyleHa T. H. Nguyen, Bien Q. Nguyen, Thuy T. Duong, Anh T. K. Bui, Hang T. A. Nguyen, Ha T. Cao, Nhuan T. Mai, Khai M. Nguyen, Nguyen Thi Hoang Ha, Kyoung-Woong Kim. Pilot-Scale Removal of Arsenic and Heavy Metals from Mining Wastewater Using Adsorption Combined with Constructed Wetland. Minerals. 2019; 9 (6):379.
Chicago/Turabian StyleHa T. H. Nguyen; Bien Q. Nguyen; Thuy T. Duong; Anh T. K. Bui; Hang T. A. Nguyen; Ha T. Cao; Nhuan T. Mai; Khai M. Nguyen; Nguyen Thi Hoang Ha; Kyoung-Woong Kim. 2019. "Pilot-Scale Removal of Arsenic and Heavy Metals from Mining Wastewater Using Adsorption Combined with Constructed Wetland." Minerals 9, no. 6: 379.
Silicon (Si) has been recently reconsidered as a beneficial element due to its direct roles in stimulating the growth of many plant species and alleviating metal toxicity. This study aimed at validating the potential of an aquatic macrophyte Eleocharis acicularis for simultaneous removal of heavy metals from aqueous solutions under different dissolved Si. The laboratory experiments designed for determining the removal efficiencies of heavy metals were conducted in the absence or presence of Si on a time scale up to 21 days. Eleocharis acicularis was transplanted into the solutions containing 0.5 mg L−1 of indium (In), gallium (Ga), silver (Ag), thallium (Tl), copper (Cu), zinc (Zn), cadmium (Cd), and lead (Pb) with various Si concentrations from 0 to 4.0 mg L−1. The results revealed that the increase of dissolved Si concentrations enhanced removal efficiencies of E. acicularis for Ga, Cu, Zn, Cd, and Pb, while this increase did not show a clear effect for In, Tl, and Ag. Our study presented a notable example of combining E. acicularis with dissolved Si for more efficient removals of Cu, Zn, Cd, Pb, and Ga from aqueous solutions. The findings are applicable to develop phytoremediation or phytomining strategy for contaminated environment.
Ha T.H. Nguyen; Masayuki Sakakibara; Minh N. Nguyen; Nhuan T. Mai; Vinh T. Nguyen. Effect of Dissolved Silicon on the Removal of Heavy Metals from Aqueous Solution by Aquatic Macrophyte Eleocharis acicularis. Water 2019, 11, 940 .
AMA StyleHa T.H. Nguyen, Masayuki Sakakibara, Minh N. Nguyen, Nhuan T. Mai, Vinh T. Nguyen. Effect of Dissolved Silicon on the Removal of Heavy Metals from Aqueous Solution by Aquatic Macrophyte Eleocharis acicularis. Water. 2019; 11 (5):940.
Chicago/Turabian StyleHa T.H. Nguyen; Masayuki Sakakibara; Minh N. Nguyen; Nhuan T. Mai; Vinh T. Nguyen. 2019. "Effect of Dissolved Silicon on the Removal of Heavy Metals from Aqueous Solution by Aquatic Macrophyte Eleocharis acicularis." Water 11, no. 5: 940.
This study was conducted to determine the soil contamination and the accumulation of arsenic (As) and heavy metals including chromium (Cr), copper (Cu), zinc (Zn), cadmium (Cd), and lead (Pb) in 15 native and cultivated plant species in a Pb recycling area of Dong Mai village, Hung Yen Province, Vietnam. The analysis of 32 soil samples collected from seven different sites in the study area revealed that the contents of Al, Fe, As, Cr, Cu, Zn, Cd, and Pb in the soils ranged from 6200–32,600, 11,300–55,500, 5.4–26.8, 24.9–290, 66.0–252, 143–455, 0.71–1.67, and 370–47,400 mg/kg, respectively. The contents of As, Cr, Cu, Zn, Cd, and Pb in rice grains and the shoots of 15 plant species ranged from 0.14–10.2, 1.00–10.2, 5.19–23.8, 34.7–165, 0.06–0.99, and 2.83–1160 mg/kg-dry weight (DW), respectively. Hymenachne acutigluma (Steud.) Gilliland, a potential hyperaccumulator of Pb (1160 mg/kg–DW), is considered the best candidate for phytoremediation of Pb-contaminated soil. The cultivation of rice and vegetables, and the use of some native plants for food for humans, pigs, and cattle should be managed with consideration of the accumulation of Pb in their aboveground biomass.
Ha T. T. Chu; Tu V. Vu; Tam K. B. Nguyen; Ha T. H. Nguyen. Accumulation of Arsenic and Heavy Metals in Native and Cultivated Plant Species in a Lead Recycling Area in Vietnam. Minerals 2019, 9, 132 .
AMA StyleHa T. T. Chu, Tu V. Vu, Tam K. B. Nguyen, Ha T. H. Nguyen. Accumulation of Arsenic and Heavy Metals in Native and Cultivated Plant Species in a Lead Recycling Area in Vietnam. Minerals. 2019; 9 (2):132.
Chicago/Turabian StyleHa T. T. Chu; Tu V. Vu; Tam K. B. Nguyen; Ha T. H. Nguyen. 2019. "Accumulation of Arsenic and Heavy Metals in Native and Cultivated Plant Species in a Lead Recycling Area in Vietnam." Minerals 9, no. 2: 132.
Arsenic and heavy-metal-contaminated environments are a major concern due to their negative impacts on exposed people and ecosystems. In this study, sludge from an iron-ore processing area was used as an adsorbent to remove As, Mn, Zn, Cd, and Pb from aqueous solutions. The adsorption capacity of target adsorbates was investigated in batch experiments of both single- and mixed-metal solutions. The batch studies show that the maximum Langmuir adsorption capacities of the heavy metals onto the adsorbent occurred in the order Pb > As > Cd > Zn > Mn, and ranged from 0.710 mg/g to 1.113 mg/g in the single-metal solutions and from 0.370 mg/g to 1.059 mg/g in the mixed-metal solutions. The results of the kinetic experiments are consistent with pseudo-first-order and pseudo-second-order models, with a slightly better fit to the latter. Adsorption performances indicate that iron-ore sludge can simultaneously adsorb multiple metal ions and is a promising adsorbent for the removal of toxic pollutants from water.
Khai Nguyen; Bien Q. Nguyen; Hai T. Nguyen; Ha T.H. Nguyen. Adsorption of Arsenic and Heavy Metals from Solutions by Unmodified Iron-Ore Sludge. Applied Sciences 2019, 9, 619 .
AMA StyleKhai Nguyen, Bien Q. Nguyen, Hai T. Nguyen, Ha T.H. Nguyen. Adsorption of Arsenic and Heavy Metals from Solutions by Unmodified Iron-Ore Sludge. Applied Sciences. 2019; 9 (4):619.
Chicago/Turabian StyleKhai Nguyen; Bien Q. Nguyen; Hai T. Nguyen; Ha T.H. Nguyen. 2019. "Adsorption of Arsenic and Heavy Metals from Solutions by Unmodified Iron-Ore Sludge." Applied Sciences 9, no. 4: 619.