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Effect of oxygen limitation on solid-bed bioleaching of heavy metals from contaminated sediments 总被引:2,自引:0,他引:2
The effects of oxygen limitation on solid-bed bioleaching of heavy metals (Me) were studied in a laboratory percolator system using contaminated sediment supplemented with 2% elemental sulfur (So). Oxygen limitation was realized by controlling the gas flow and oxygen concentration in the aeration gas. The oxygen supply varied between 150 and 0.5 mol So (-1) over 28 d of leaching. Moderate oxygen limitation led to temporarily suppression of acidification, rate of sulfate generation and Me solubilization. Lowering the oxygen supply to 0.5 mol O2 mol So (-1) resulted in retarding acidification over a period of three weeks and in poor Me solubilization. Oxidation of So occurred even under strong oxygen limitation at a low rate. High surplus of oxygen was necessary for almost complete oxidation of the added So. The maximum Me solubilization was reached at an oxygen supply of 7.5 mol O2 mol So (-1). Thus, the oxygen input during solid-bed bioleaching can be reduced considerably by controlling the gas flow without loss of metal removal efficiency. Oxygen consumption rates, ranging from 0.4 x 10(-8) to 0.8 x 10(-8) Kg O2 Kg dm (-1) S(-1), are primarily attributed to high reactivity of the sulfur flower and high tolerance of indigenous autotrophic bacteria to low oxygen concentrations. The So related oxygen consumption was calculated assuming a molar yield coefficient Y O2/S of 1.21. The oxygen conversion degree, defined as part of oxygen feed consumed by So oxidation, increased from 0.7% to 68% when the oxygen supply was reduced from 150 to 0.5 mol O2 mol So (-1). 相似文献
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Romain Amiot Delphine Angst Serge Legendre Eric Buffetaut François Fourel Jan Adolfssen Aurore André Ana Voica Bojar Aurore Canoville Abel Barral Jean Goedert Stanislaw Halas Nao Kusuhashi Ekaterina Pestchevitskaya Kevin Rey Aurélien Royer Antônio Álamo Feitosa Saraiva Bérengère Savary-Sismondini Jean-Luc Siméon Alexandra Touzeau Zhonghe Zhou Christophe Lécuyer 《Die Naturwissenschaften》2017,104(5-6):47
Oxygen isotope compositions of bone phosphate (δ18Op) were measured in broiler chickens reared in 21 farms worldwide characterized by contrasted latitudes and local climates. These sedentary birds were raised during an approximately 3 to 4-month period, and local precipitation was the ultimate source of their drinking water. This sampling strategy allowed the relationship to be determined between the bone phosphate δ18Op values (from 9.8 to 22.5‰ V-SMOW) and the local rainfall δ18Ow values estimated from nearby IAEA/WMO stations (from ?16.0 to ?1.0‰ V-SMOW). Linear least square fitting of data provided the following isotopic fractionation equation: δ18Ow = 1.119 (±0.040) δ18Op ? 24.222 (±0.644); R 2 = 0.98. The δ18Op–δ18Ow couples of five extant mallard ducks, a common buzzard, a European herring gull, a common ostrich, and a greater rhea fall within the predicted range of the equation, indicating that the relationship established for extant chickens can also be applied to birds of various ecologies and body masses. Applied to published oxygen isotope compositions of Miocene and Pliocene penguins from Peru, this new equation computes estimates of local seawater similar to those previously calculated. Applied to the basal bird Confuciusornis from the Early Cretaceous of Northeastern China, our equation gives a slightly higher δ18Ow value compared to the previously estimated one, possibly as a result of lower body temperature. These data indicate that caution should be exercised when the relationship estimated for modern birds is applied to their basal counterparts that likely had a metabolism intermediate between that of their theropod dinosaur ancestors and that of advanced ornithurines. 相似文献
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Lebaron Karine Mechiri Lilia Richard Simone Austruy Annabelle Boudenne Jean-Luc Coupé Stéphane 《Environmental science and pollution research international》2019,26(20):20573-20580
Environmental Science and Pollution Research - Water chlorination is the most widely used technique to avoid microbial contamination and biofouling. Adding chlorine to bromide-rich waters leads to... 相似文献
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Andrea Garcia Bravo Jean-Luc Loizeau Lydie Ancey Viorel Gheorghe Ungureanu Janusz Dominik 《Environmental science and pollution research international》2009,16(1):66-75