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研究零价铁(ZVI)与奥奈达希瓦氏菌(S.oneidensis)协同还原去除水相中U(Ⅵ)时,共存离子Cr~(6+)、Fe~(3+)、Cu~(2+)、Mn~(2+)、Zn~(2+)、NO_3~-和SO_4~(2-)分别存在时对U(Ⅵ)还原效果的影响。结果表明:溶液中共存的Cr~(6+)和溶解态的Fe~(3+)对ZVI与微生物协同还原U(Ⅵ)均存在显著的抑制作用,且当溶液中共存Cr~(6+)的含量超过10.0 mg/L时,U(Ⅵ)的还原几乎被完全抑制。在共存金属浓度为20 mg/L时,Cu~(2+)、Zn~(2+)对U(Ⅵ)的还原均具有抑制作用,且Cu~(2+)的影响大于Zn~(2+);Mn~(2+)对U(Ⅵ)的还原有微弱的促进作用。共存阴离子SO_4~(2-)对U(Ⅵ)的还原有微弱的促进作用,且作用大小与其浓度成正相关;在0.5~5.0 mmol/L浓度范围内,12 h时,共存阴离子NO_3~-对U(Ⅵ)的还原有明显的抑制作用。
In this study, the synergistic reduction of ZVI and S.oneidensis to remove U (¢ ö) in the aqueous phase resulted in the formation of coexistent Cr6 +, Fe3 +, Cu ~ (2 +), Mn ~ (2 +), Zn ~ (2 +), NO_3 ~ - and SO_4 ~ (2-) on the reduction of U (Ⅵ) The results showed that Cr 6+ and Fe 3+ dissolved in solution significantly inhibited the synergistic reduction of ZVI and microorganism U (Ⅵ) ) Is more than 10.0 mg / L, the reduction of U (Ⅵ) is almost completely inhibited. At the concentration of 20 mg / L, both Cu 2+ and Zn 2+ inhibited the reduction of U (Ⅵ), and the effect of Cu 2+ was greater than that of Zn 2+ +); Mn ~ (2+) weakly promoted the reduction of U (Ⅵ). The coexistent anion SO 4 2- has a weak promoting effect on the reduction of U (Ⅵ), and the effect is positively correlated with its concentration. At the concentration of 0.5-5.0 mmol / L, the coexistent anion NO 3 - U (Ⅵ) reduction significantly inhibited.