Analysis of Surface Water Quality and Sediments Content on Danube Basin in Djerdap-Iron Gate Protected Areas

Popescu, Francisc; Trumić, Milan; Cioablă, Adrian Eugen; Vujić, B.; Stoica, Virgil; Trumić, Maja S.; Opriș, Carmen; Bogdanović, Grozdanka; Trif-Tordai, G.

doi:10.3390/w14192991

Cited by 6 publications

(5 citation statements)

References 55 publications

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“…Heavy metals, including copper, cadmium, lead, nickel, arsenic, chromium, etc., are non-biodegradable and tend to accumulate in the environment [1][2][3]. Water pollution with heavy metals resulting from anthropogenic activities is one of the global risks to humans [4]. At the same time, serious pollution of ecosystems with heavy metals can be observed with the increase in industrialization [5].…”

Section: Introductionmentioning

confidence: 99%

New Chelate Resins Prepared with Direct Red 23 for Cd2+, Ni2+, Cu2+ and Pb2+ Removal

et al. 2022

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In this paper, two chelate resins prepared by a simple procedure were used for the removal of Cd2+, Ni2+, Cu2+, and Pb2+ (M2+) from aqueous solutions. Amberlite IRA 402 strongly basic anion exchange resin in Cl− form (IRA 402(Cl−) together with Amberlite XAD7HP acrylic ester co-polymer (XAD7HP) were functionalized with chelating agent Direct red 23 (DR 23). The chelate resins (IRA 402-DR 23 and XAD7HP-DR 23) were obtained in batch mode. The influence of interaction time, pH and the initial concentration of DR 23 solution was investigated using UV-Vis spectrometry. The time necessary to reach equilibrium was 90 min for both resins. A negligible effect of adsorption capacity (Qe) was obtained when the DR 23 solution was adjusted at a pH of 2 and 7.9. The Qe of the XAD7HP resin (27 mg DR 23/g) is greater than for IRA 402(Cl−) (21 mg DR 23/g). The efficiency of chelating resins was checked via M2+ removal determined by the atomic adsorption spectrometry method (AAS). The M2+ removal by the IRA 402-DR 23 and XAD7HP-DR 23 showed that the latter is more efficient for this propose. As a consequence, for divalent ions, the chelated resins followed the selectivity sequence: Cd2+ > Cu2+ > Ni2+ > Pb2+. Additionally, Cd2+, Cu2+ and Ni2+ removal was fitted very well with the Freundlich model in terms of height correlation coefficient (R2), while Pb2+ was best fitted with Langmuir model for IRA 402-DR 23, the Cu2+ removal is described by the Langmuir model, and Cd2+, Ni2+ and Pb2+ removal was found to be in concordance with the Freundlich model for XAD7HP-DR 23. The M2+ elution from the chelate resins was carried out using 2 M HCl. The greater M2+ recovery from chelating resins mass confirmed their sustainability. The chelate resins used before and after M2+ removal by Fourier transform infrared spectroscopy (FTIR) and scanning electron microscopy (SEM) analysis were evaluated.

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Section: Introductionmentioning

confidence: 99%

New Chelate Resins Prepared with Direct Red 23 for Cd2+, Ni2+, Cu2+ and Pb2+ Removal

et al. 2022

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“…In a previous study, by Stevanović et al [1], the concentration of metals determined was lower than the concentration determined in the current study. In the study made by Popescu et al [28], lower concentrations were observed for As, Cr, Fe, Hg, Mn and Zn. An increase in the concentration of heavy metals over time may be due to the accumulation of these metals due to continuous pollution [1,28].…”

Section: Heavy Metal Concentrationsmentioning

confidence: 82%

“…In the study made by Popescu et al [28], lower concentrations were observed for As, Cr, Fe, Hg, Mn and Zn. An increase in the concentration of heavy metals over time may be due to the accumulation of these metals due to continuous pollution [1,28]. Also, the concentration of heavy metals can present variations due to meteorological conditions, or even due to the exact sampling sites [29].…”

Section: Heavy Metal Concentrationsmentioning

confidence: 82%

Hydrochemical and Ecotoxicological Characterisation of Water Samples from Moldova Noua Area, Romania

Vulpe,

Boros,

Matica

et al. 2023

Ecological Chemistry and Engineering S

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The abandoned copper mine in the Moldova Noua area is still producing mining pollution today due to the drying of tailings ponds and the carrying of contaminated dust by the winds, leading to potential contamination of surface waters and groundwaters. The purpose of this study is the assessment of some surface waters and groundwaters potentially contaminated by mining pollutants from Moldova Noua area regarding their hydrochemical and ecotoxicological properties. The physicochemical parameters (pH, conductivity, dissolved oxygen, and turbidity) were determined in situ, with the concentrations of heavy metals (As, Cd, Cr, Cu, Fe, Mn, Ni, Pb, and Zn) being determined in the laboratory. Inhibition of acid phosphatase enzymatic activity and yeast toxicity tests were the two ecotoxicological tests used for the evaluation of mining pollution effects on the quality of surface waters and groundwater. The results highlighted that most of the physicochemical parameters and heavy metal concentrations were within normal limits. With the exception of the surface water sample collected from the Bosneag River, upstream of Moldova Noua, all samples induced inhibition compared to the positive control in the ecotoxicological tests applied. Statistically significant correlations were observed, with the total concentration of iron ions presenting the most statistically significant correlations with other parameters. A grading scale was used to assess the state of the waters, highlighting the weak impact of mining pollutants on the analysed samples.

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“…Some studies, like the one reported in [5], aims to determine the presence of some specific pollutants (e.g., arsenic) in drinking water. The importance of water quality in significant water bodies like Danube River is tackled in [6], both concerning the oxygen content necessary for fish welfare and the heavy metals content due to tributaries and wastewater discharge. On the other hand, human activities result in significant wastewater amounts-both domestic and industrial.…”

Section: Introductionmentioning

confidence: 99%

Saving Energy in Biological Wastewater Treatment by Using Extremely Low-Frequency Electric Field—Pilot-Scale Study

et al. 2023

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The results of a pilot-scale study on the influence of electric field use for stimulating the active sludge in the biological purification tank of a small capacity wastewater treatment plant (up to 600 m3/day) are presented. Through specific comparative chemical tests (DO, COD, N-NH4, and Pt) it was found that, by applying a sinusoidal electric field of 5 Vrms/m at 49.9 Hz on the active sludge suspension, the overall pollutant denitrification process speed is doubled compared with the reference case when no stimulation is used. Also, under identical operating conditions, the residual pollutant content of the biological treatment tank outlet water is reduced approximately three times for COD and approximately two times for N-NH4 and Pt compared to the reference tank. These findings lead to the conclusion that, by stimulating the active sludge microbial activity of the wastewater treatment plants by a sinusoidal electric field of 5 Vrms/m at 49.9 Hz, the time of the biological purification treatment can be reduced by approx. 50%. This leads to a corresponding decrease in energy consumption, which usually represents more than 30% of a wastewater treatment plant’s specific electricity consumption.

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Analysis of Surface Water Quality and Sediments Content on Danube Basin in Djerdap-Iron Gate Protected Areas

Cited by 6 publications

References 55 publications

New Chelate Resins Prepared with Direct Red 23 for Cd2+, Ni2+, Cu2+ and Pb2+ Removal

New Chelate Resins Prepared with Direct Red 23 for Cd2+, Ni2+, Cu2+ and Pb2+ Removal

Hydrochemical and Ecotoxicological Characterisation of Water Samples from Moldova Noua Area, Romania

Saving Energy in Biological Wastewater Treatment by Using Extremely Low-Frequency Electric Field—Pilot-Scale Study

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