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  • 1
    Online-Ressource
    Online-Ressource
    Pesticide production wastewater treatment by Electro-Fenton using Taguchi experimental design
    IWA Publishing ; 2021
    In:  Water Science and Technology Vol. 84, No. 10-11 ( 2021-11-15), p. 3155-3171
    Details
    In: Water Science and Technology, IWA Publishing, Vol. 84, No. 10-11 ( 2021-11-15), p. 3155-3171
    Kurzfassung: In this study, the electro-Fenton (EF) method was applied to remove total organic carbon (TOC) from the pesticide production wastewater containing tricyclazole (TC). Statistical Taguchi method was used to optimize the treatment performance. Analysis of variance (ANOVA) indicated that the polynomial regression model fitted experimental data with R2 of 0.969. The optimal conditions for eliminating 75.4% TOC and 93.7% TC were 0.2 mM of Fe2+, 990 mg/L of Na2SO4, 180 min of reaction time at pH 3 with 2.22 mA/cm2 of current density. The removal of TC present in the wastewater followed the first-order reaction kinetic model (R2 = 0.993); while that was the second-order kinetic model in the case of the TOC removal (R2 = 0.903). In addition, the experimental results and theory approaches (density functional theory and natural bond orbital calculations) also showed the C-N bond breaking and nitrate ions cleavage to ammonia. Acute toxicity of the pesticide wastewater after treatment (PWAT) on microcrustaceans showed that the treated wastewater still exhibited high toxicity against D. magna, with LC50 values of 3.84%, 2.68%, 2.05%, and 1.78% at 24 h, 48 h, 72 h, and 96 h, respectively.
    Materialart: Online-Ressource
    ISSN: 0273-1223 , 1996-9732
    URL: Article
    DOI: 10.2166/wst.2021.372
    Sprache: Englisch
    Verlag: IWA Publishing
    Publikationsdatum: 2021
    ZDB Id: 764273-8
    ZDB Id: 2024780-1
    SSG: 14
    Standort Signatur Einschränkungen Verfügbarkeit
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    Online-Ressource
  • 2
    Online-Ressource
    Online-Ressource
    Removal of total nitrogen from wastewater by a combination of Chlorella sp. and audible sound
    IWA Publishing ; 2021
    In:  Water Science and Technology Vol. 84, No. 10-11 ( 2021-11-15), p. 3132-3142
    Details
    In: Water Science and Technology, IWA Publishing, Vol. 84, No. 10-11 ( 2021-11-15), p. 3132-3142
    Kurzfassung: In developing countries, nitrogen in the traditional market wastewater is a critical environmental problem. In this study, the microalga Chlorella sp., which was isolated from wastewater, was used to remove the total nitrogen (TN) from conventional market wastewater in combination with audible sound (Vietnamese classical music). In addition, effects of sound exposure on removal efficiency at different initial cell densities were analyzed. Results revealed that music sound control demonstrates potential to improve the removal efficiency. TN removal efficiencies of 96%, 69.5%, and 4.3% were observed for treatments with Chlorella sp./audible sound, Chlorella sp., and without Chlorella sp., respectively. The significance of probability value (p-value) ( & lt;0.05) on the paired sample t-test confirmed the critical role of audible sound and Chlorella sp. density on the TN removal in screening experiments. The predicted optimal conditions for TN removal were as follows: a Chlorella sp. density of 4%, an audible sound of 52.5 dB, and a cultivation time of 4.6 days. Results based on statistical analysis revealed that the quadratic models for TN removal are significant at a low p-value ( & lt;0.05) and a high predicted coefficient of determination (R2 = 0.9452) value. The obtained statistical results also indicated that most of the variables are significant for the abatement of TN from market wastewater using Chlorella sp.
    Materialart: Online-Ressource
    ISSN: 0273-1223 , 1996-9732
    URL: Article
    DOI: 10.2166/wst.2021.345
    Sprache: Englisch
    Verlag: IWA Publishing
    Publikationsdatum: 2021
    ZDB Id: 764273-8
    ZDB Id: 2024780-1
    SSG: 14
    Standort Signatur Einschränkungen Verfügbarkeit
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    Online-Ressource
  • 3
    Online-Ressource
    Online-Ressource
    Life cycle assessment of paper mill wastewater: a case study in Viet Nam
    IWA Publishing ; 2022
    In:  Water Science and Technology Vol. 85, No. 5 ( 2022-03-01), p. 1522-1537
    Details
    In: Water Science and Technology, IWA Publishing, Vol. 85, No. 5 ( 2022-03-01), p. 1522-1537
    Kurzfassung: Although in a critical position in the economy, the paper industry releases a lot of wastewater that requires adequate treatment for sustainable development. This study presents an application of Life cycle assessment (LCA) with the ReCiPe tool on the wastewater treatment plant (WWTP) of a paper factory in Vietnam to evaluate the environmental effect of the individual techniques in WWTP, especially the internal circulation (IC) reactor, a pioneer and practical anaerobic technology. Both Midpoint and Endpoint categories results demonstrated that chemical use and electricity consumption mainly contributed to the environmental impact in the WWTP. The Dissolved air flotation (DAF) and Moving bed biofilm reactor (MBBR) are classified as effective techniques to reduce the impacts on the environment. Moreover, the comparison of LCA between IC and up-flow anaerobic sludge bed (UASB) shows that IC is the better practically green technique for the environment.
    Materialart: Online-Ressource
    ISSN: 0273-1223 , 1996-9732
    URL: Article
    DOI: 10.2166/wst.2022.049
    Sprache: Englisch
    Verlag: IWA Publishing
    Publikationsdatum: 2022
    ZDB Id: 764273-8
    ZDB Id: 2024780-1
    SSG: 14
    Standort Signatur Einschränkungen Verfügbarkeit
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    Online-Ressource
  • 4
    Online-Ressource
    Online-Ressource
    Adsorption of nitrate and phosphate in an aqueous solution on composites of PVA and chitosan prepared from a Somanniathelphusa sinensis shell
    IWA Publishing ; 2021
    In:  Water Supply Vol. 21, No. 2 ( 2021-03-01), p. 765-779
    Details
    In: Water Supply, IWA Publishing, Vol. 21, No. 2 ( 2021-03-01), p. 765-779
    Kurzfassung: In this study, chitosan was prepared from the shell of Somanniathelphusa sinensis, which is a crab ubiquitous in Vietnam. The 3-level, 3-factor Box–Behnken design was applied to the preparation of chitosan to investigate effects of factors such as the HCl solution concentration, protein removal time and deacetylation time on the degree of deacetylation (%DD). Scanning electron microscopy, Fourier transform infrared spectroscopy, energy-dispersive X-ray spectroscopy and gel permeation chromatography were employed to examine the chitosan structure, as well as pH titration and antibacterial testing of the chitosan solution. Results revealed that as-p chitosan comprises specific functional groups, with almost no impurities. Its average molecular weight was ∼225,000 g/mol, and %DD was ∼89.7%. The chitosan/PVA composite was prepared and investigated for the adsorption of nitrate and phosphate ions in water. Experimental results revealed that the adsorption capacity of a chitosan/PVA (1:2) composite is better than that of chitosan. Accordingly, the theoretical maximum adsorption capacities of nitrate and phosphate ions on chitosan were 122.0 mg/g and 344.8 mg/g, respectively. The corresponding values on the chitosan/PVA (1:2) composite were 135.1 mg/g and 384.6 mg/g. Adsorption kinetics data at 25 °C were well fitted to the pseudo-second-order model (R2 & gt; 0.998). These results revealed that crab shell chitosan and the chitosan/PVA (1:2) composite can be used for the adsorption of nitrates and phosphates in aqueous solutions.
    Materialart: Online-Ressource
    ISSN: 1606-9749 , 1607-0798
    URL: Article
    DOI: 10.2166/ws.2020.362
    RVK:
    ZI 6705
    Sprache: Englisch
    Verlag: IWA Publishing
    Publikationsdatum: 2021
    ZDB Id: 2967640-X
    Standort Signatur Einschränkungen Verfügbarkeit
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    Online-Ressource
  • 5
    Online-Ressource
    Online-Ressource
    Ecological and human health risk assessments of cyanotoxins and heavy metals in a drinking water supply reservoir
    IWA Publishing ; 2023
    In:  Journal of Water and Health Vol. 21, No. 8 ( 2023-08-01), p. 1004-1016
    Details
    In: Journal of Water and Health, IWA Publishing, Vol. 21, No. 8 ( 2023-08-01), p. 1004-1016
    Kurzfassung: Human beings are frequently exposed to a mixture of chemical pollutants through the ingestion of contaminated drinking water. The present study aimed to assess the ecological and human health risks associated with the contamination of cyanotoxins and heavy metals in a drinking water supply reservoir, the Tri An Reservoir (TAR), in Vietnam. Results demonstrated that the concentrations of individual heavy metals varied in the following order: iron (Fe) & gt; lead (Pb) & gt; arsenic (As) & gt; zinc (Zn). Although the ecological potential risk of heavy metals was low during the study period, the concentration of Fe sometimes exceeded the Vietnamese standard for drinking water. Toxic cyanobacteria and microcystins (MCs) frequently occurred in the TAR with the highest density of 198.7 × 103 cells/mL and 7.8 μg/L, respectively, indicating a high risk of health impacts to humans. The results of the study indicate that exposure to heavy metals does not pose any non-carcinogenic health risks for both adults and children. However, the contamination of MCs in the surface water posed a serious disease enhancement to both adults and children through direct ingestion and dermal absorption.
    Materialart: Online-Ressource
    ISSN: 1477-8920 , 1996-7829
    URL: Article
    DOI: 10.2166/wh.2023.027
    Sprache: Englisch
    Verlag: IWA Publishing
    Publikationsdatum: 2023
    ZDB Id: 2113236-7
    Standort Signatur Einschränkungen Verfügbarkeit
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    Online-Ressource
  • 6
    Online-Ressource
    Online-Ressource
    Bandgap tuning of TiO2 by Cu nanoparticles applied in photocatalytic antifouling-coated PES membranes through PAA-plasma grafted adhesive layer
    IWA Publishing ; 2023
    In:  Water Science & Technology Vol. 87, No. 9 ( 2023-05-01), p. 2390-2405
    Details
    In: Water Science & Technology, IWA Publishing, Vol. 87, No. 9 ( 2023-05-01), p. 2390-2405
    Kurzfassung: This study developed an antifouling coating for polyethersulfone (PES) membranes by tuning the bandgap of TiO2 with Cu nanoparticles (NPs) via a polyacrylic acid (PAA)-plasma-grafted intermediate layer. Cu NPs were synthesized at different molar ratios and precipitated onto TiO2 using the sol-gel method. The resulting Cu@TiO2 photocatalysts were characterized using various techniques, showing reduced bandgap, particle size range of 100–200 nm, and generation of reactive free radicals under light irradiation. The 25% Cu@TiO2 photocatalyst displayed the highest catalytic efficiency for Acid Blue 260 (AB260) degradation, achieving 73% and 96% with and without H2O2, respectively. Photocatalytic membranes based on this catalyst achieved an AB260 degradation efficiency of 91% and remained stable over five cycles. Additionally, sodium alginate-fouled photocatalytic membranes fully recovered water permeability after undergoing photocatalytic degradation of foulants. The modified membrane displayed a higher surface roughness due to the presence of photocatalyst particles. This study demonstrates the potential application of Cu@TiO2/PAA/PES photocatalytic membranes for mitigating membrane fouling in practice.
    Materialart: Online-Ressource
    ISSN: 0273-1223 , 1996-9732
    URL: Article
    DOI: 10.2166/wst.2023.129
    Sprache: Englisch
    Verlag: IWA Publishing
    Publikationsdatum: 2023
    ZDB Id: 764273-8
    ZDB Id: 2024780-1
    SSG: 14
    Standort Signatur Einschränkungen Verfügbarkeit
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    Online-Ressource
  • 7
    Online-Ressource
    Online-Ressource
    Integration of aerobic granular sludge and membrane filtration for tapioca processing wastewater treatment: fouling mechanism and granular stability
    IWA Publishing ; 2018
    In:  Journal of Water Supply: Research and Technology-Aqua Vol. 67, No. 8 ( 2018-12), p. 846-857
    Details
    In: Journal of Water Supply: Research and Technology-Aqua, IWA Publishing, Vol. 67, No. 8 ( 2018-12), p. 846-857
    Materialart: Online-Ressource
    ISSN: 0003-7214 , 1605-3974
    URL: Article
    DOI: 10.2166/aqua.2018.104
    Sprache: Englisch
    Verlag: IWA Publishing
    Publikationsdatum: 2018
    ZDB Id: 3063841-0
    Standort Signatur Einschränkungen Verfügbarkeit
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    Online-Ressource
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