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- W1970929983 abstract "The addition of metal chelates such as Fe(II)EDTA or Fe(II)Cit to wet flue gas desulfurization systems has been shown to increase the amount of NOx absorption from gas streams containing SO2. This paper attempts to demonstrate the advantage of not only using Fe(II)Cit chelate to absorb nitrogen oxides from flue gas but also the advantage gained from adding microorganisms to the system. Two distinct classes of microorganisms are needed: denitrifying and iron-reducing bacteria. The presence of oxygen in flue gas will affect the absorption efficiency of NO by Fe(II)Cit chelate. The oxidation of Fe(II) can be slowed with the help of bacteria in two ways: bacteria can serve to directly reduce Fe(III) to Fe(II) or they can serve to keep levels of dissolved oxygen in the solution low. As a result, after NO absorption, Fe(II)(Cit)NO will be reduced by denitrifying bacteria to Fe(II)Cit while Fe(III) is reduced by anaerobic bacteria back to Fe(II). Our experiments have shown that the implementation of our protocol allowed for an NO reduction rate constant increase from standard levels of 0.0222–0.100 mM h−1 with inlet NO changed from 250 to 1000 ppm. We have also found that total Fe concentration tends to decrease after prolonged periods of operation due to the loss of some Fe to the formation of Fe(OH)3 that settles together with the sludge at the bottom of bioreactor tank." @default.
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- W1970929983 date "2007-04-01" @default.
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- W1970929983 title "Removing nitric oxide from flue gas using iron(II) citrate chelate absorption with microbial regeneration" @default.
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- W1970929983 doi "https://doi.org/10.1016/j.chemosphere.2006.11.015" @default.
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