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  • 1
    Language: English
    In: Journal of Plant Nutrition and Soil Science, August 2017, Vol.180(4), pp.491-495
    Description: Birnessite is a highly reactive manganese oxide and common in soil. We checked the attachment of birnessite, synthesized by the reduction of permanganate by lactate, on sand‐sized quartz to produce birnessite‐coated sand (BCS). Attachment and aggregation of birnessite increased with pH and reaction time. The extent of Cu and Zn adsorption to BCS was similar to that of birnessites in previous studies. Based on these results and the stability of this BCS, it may be used in water treatment.
    Keywords: Manganese Oxide ; Metal Adsorption ; Permanganate Reduction ; Water Treatment
    ISSN: 1436-8730
    E-ISSN: 1522-2624
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  • 2
    Language: German
    In: Umweltwissenschaften und Schadstoff-Forschung, 2004, Vol.16(3), pp.151-154
    Description: Hochofengasschlamm ist ein Abfallprodukt der Roheisenerzeugung, das Schadstoffe wie Blei, Zink, Fluorid und Cyanid enthält und über Auswaschung das Grundwasser belasten kann. Wir untersuchten die chemische Zusammensetzung von 27 Proben deponierter Hochofengasschlämme in Porenwässern, die durch Zentrifugieren feldfrischen Materials gewonnen wurden und in Eluaten nach DIN 38414 Teil 4 (S 4). Sowohl die Porenwässer als auch die Eluate waren neutral bis alkalisch (pH 7,3 bis 10,7) und wurden von Alkali-und Erdalkalimetallen sowie Sulfat und Nitrat dominiert. Die Konzentrationen sämtlicher untersuchten Elemente und Verbindungen waren in den Porenwässern meist deutlich höher als in den Eluaten. Die durchschnittlichen Konzentrationen in den Porenwässern der umweltrelevanten Bestandteile Blei (0,18 mgl-1), Zink (1,5 mgl-1), Fluorid (10,6 mgl-1) und Gesamtcyanid (1,8 mgl-1) lagen deutlich über den Prüfwerten der Bundes-Bodenschutz-und Altlastenverordnung für den Wirkungspfad Boden-Grundwasser. Blei-, Zink- und Gesamtcyanidkonzentrationen in den Porenwässern wurden in Eluaten sehr stark unterschätzt, da diese Konzentrationen in den Eluaten um 70 bis 90% geringer als in den Porenwässern waren. Im Fall deponierter Hochofengasschlämme liefern Eluate nach DIN 38414 Teil 4 (S 4) unrealistisch geringe Stoffkonzentrationen zur Sickerwasserprognose. Blast-furnace sludge is a waste originating from pig-iron production and contains contaminants such as lead, zinc, fluoride and cyanide assumably contaminating the groundwater by leaching. We investigated the chemical composition of 27 samples of landfilled blast-furnace sludge in pore waters which were obtained by the centrifugation of fresh material and elution with water according to DIN 38414 part 4 (S 4). The pore waters as well as the eluates were neutral to alkaline (pH 7.3 to 10.7) and were dominated by alkali and alkaline-earth metals as well as sulphate and nitrate. The concentrations of all elements and compounds investigated were mostly clearly larger in the pore waters than in the eluates. The average concentrations of environmentally relevant constituents such as lead (0,18 mg-1), zinc (1,5 mg l-1), fluoride (10,6 mg l-1), and total cyanide (1.8 mg l-1) in the pore waters were distinctly larger than the inspection value of the German Federal soil Protection Ordinance for the pathway soil-groundwater. Lead, zinc, and total cyanide concentrations in the pore waters were largely underestimated by the eluates, as these concentrations were 70 to 90% lower in the eluates compared to the pore waters. In the case of landfilled blast-furnace sludge, eluates according to DIN 38414 part 4 (S 4) provide low concentrations which are unrealistic to forecast concentrations in the seepage water.[PUBLICATION ]
    Keywords: Blast-furnace sludge ; cyanide ; eluates ; fluoride ; lead ; pore water ; zinc
    ISSN: 0934-3504
    E-ISSN: 1865-5084
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