| 1. |
- Cucarella, Victor, et al.
(författare)
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Recycling of calcium-silicate material after wastewater filtration to agriculture -Soil condition impact
- 2012
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Ingår i: Ecological Chemistry and Engineering S. - : Walter de Gruyter GmbH. - 1898-6196. ; 19:3, s. 373-382
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Tidskriftsartikel (refereegranskat)abstract
- Reactive filter materials aimed at phosphorus (P) recovery is a novel method for on-site wastewater treatment. Once the bed filter is no longer effective, the sorbent must be replaced and can then be recycled as a soil amendment to agriculture. This study investigated the short-term effects of such amendments in a field with a wheat crop in order to evaluate the risks and/or potential benefits of this disposal option. The developed product Polonite (manufactured from Opoka) was used as a model filter sorbent in the field trial. Rates corresponding to approximately 6 and 8 tons per hectare were applied. In the short-term, this amending did not affect soil physical and sorption properties. The rate of Polonite used here, as P source for wheat was irrelevant in this kind of soil. The usefulness of this disposal option of exhausted filter material is discussed.
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| 2. |
- Jönsson, Jan Åke
(författare)
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Membrane extraction techniques in environmental analysis
- 2005
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Ingår i: Ecological Chemistry and Engineering S-Chemia i Inzynieria Ekologiczna S. - 1898-6196. ; 12:5-6, s. 519-539
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Forskningsöversikt (övrigt vetenskapligt/konstnärligt)abstract
- Membrane assisted extraction facilitates the integration of classical liquid-liquid extraction (LLE) chemistry to automated instrumental analysis. Various shortcomings of classical LLE are overcome by the membrane separation of sample (donor) and extract (acceptor): 1) reduced solvent usage, 2) higher enrichment factors, 3) no solvent evaporation and 4) no formation of emulsions. Membrane extractions provide a high degree of clean-up, permitting automated analysis of environmental and biological samples with no or very small consumption of organic solvents. This review gives a short overview of membrane extraction in environmental analytical chemistry. The principles of the equilibrium extraction approach will be described and examples involving applications to environmental samples will be presented. Keywords: Membrane extraction, Supported liquid membrane extraction, SLM, MMLLE, Liquid Phase Microextraction, Selectivity, Enrichment, Equilibrium extraction
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| 3. |
- Lindh, Per, et al.
(författare)
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Leaching of Heavy Metals from Contaminated Soil Stabilised by Portland Cement and Slag Bremen
- 2022
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Ingår i: Ecological Chemistry and Engineering S. - : Walter de Gruyter GmbH. - 1898-6196 .- 2084-4549. ; 29:4, s. 537-552
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Tidskriftsartikel (refereegranskat)abstract
- Leaching behaviour is an important evidence of soil quality. The assessment of leaching of heavy metals from the contaminated soil is vital for environmental applications. However, leaching may differ in soil stabilised by various ratios of binders. In this study we measured leaching behaviour of soil contaminated by As, Cd, Co, Cr, Cu, Hg, Ni, Pb, V, Zn, methyl Hg, aliphatic compounds of hydrocarbons, polycyclic aromatic hydrocarbons (PAHs), polychlorinated biphenyls (PCBs) and dissolved organic carbon (DOC). To evaluate leaching of these substances we tested the effects of changed amount of binder (120 kg and 150 kg) and binder ratios (70/30 %, 50/50 % and 30/70 %) added to soil samples. Soil was dredged from several stations in Ostrand area, SCA Sundsvall Ortvikens Pappersbruk. The results demonstrated a systematically decreasing leaching with the increased slag. The contribution of this research include: (i) devising systematic approach to extract information on leaching from stabilised soil collected from the coastal area of Bothnian Bay, (ii) developing a workflow for stabilising soils by various combination of Portland cement Basement CEM II/A-V (SS EN 197-1) and ground granulated blast furnace slag (GGBFS), Bremen type (SS EN 15167-1), (iii) determining water ratio and density for the untreated and stabilised soil and performing comparative analysis, (iv) evaluating chemical content of pollutants and toxic elements in the aggregated soil samples. Treatment of the contaminated soil by binders improved its parameters by the increased strength and decreased leaching of heavy metals and toxic elements.
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| 4. |
- Liugė, Monika, et al.
(författare)
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Removal of Textile Dyes From Water Using Cellulose Aerogel
- 2024
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Ingår i: Ecological Chemistry and Engineering S-Chemia I Inzynieria Ekologiczna S. - : Walter de Gruyter. - 1898-6196 .- 2084-4549. ; 31:1, s. 49-62
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Tidskriftsartikel (refereegranskat)abstract
- In this study, removal of textile dyes from artificially contaminated water was investigated using sorbent synthesised from cardboard waste. Aerogel - lightweight adsorbent - a material with a low density and large surface area. Aerogels obtained from cellulose, chitosan, lignin or pectin have good adsorption properties for removing organic pollutants from wastewater. The aim of this study was to determine the adsorption efficiency of naphthol green B, congo red, methylene blue and rhodamine B from artificially contaminated water using sorbent synthesised from cardboard waste. The mass of the cellulose aerogel (5 mas. %) adsorbents, that were used in the experiments varied from 1.6 g to 2.74 g. The optimal adsorption conditions were determined as pH = 6.0, concentration of dyes - 10 mg L-1 and 18.0 °C -19.0 °C temperature. Under the optimal conditions, the maximum removal efficiency of naphthol green B using aerogel was 16.45 %; congo red - 98.44 %; methylene blue - 79.28 %; and rhodamine B - 52.44 %.
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