Dissimilatory Fe(Ⅲ) reduction is a universal process with irreplaceable biological and environmental importance in anoxic environments. Our knowledge about Fe(Ⅲ) reduction predominantly comes from pure cultures of d...Dissimilatory Fe(Ⅲ) reduction is a universal process with irreplaceable biological and environmental importance in anoxic environments. Our knowledge about Fe(Ⅲ) reduction predominantly comes from pure cultures of dissimilatory Fe(Ⅲ) reducing bacteria (DFRB). The objective of this study was to compare the effects of glucose and a selection of short organic acids (citrate, succinate, pyruvate, propionate, acetate, and formate) on Fe(Ⅲ) reduction via the anaerobic culture of three paddy soil solutions with Fe...展开更多
In the system of nitric oxide removal from the flue gas by metal chelate absorption, it is an obstacle that ferrous absorbents are easily oxidized by oxygen in the flue gas to ferric counterparts, which are not capabl...In the system of nitric oxide removal from the flue gas by metal chelate absorption, it is an obstacle that ferrous absorbents are easily oxidized by oxygen in the flue gas to ferric counterparts, which are not capable of binding NO. By adding iron metal or electrochemical method, Fe III (EDTA) can be reduced to Fe II (EDTA). However, there are various drawbacks associated with these techniques. The dissimilatory reduction of Fe III (EDTA) with microorganisms in the system of nitric oxide removal by metal chelate absorption was investigated. Ammonium salt instead of nitrate was used as the nitrogen source, as nitrates inhibited the reduction of Fe III due to the competition between the two electron acceptors. Supplemental glucose and lactate stimulated the formation of Fe II more than ethanol as the carbon sources. The microorganisms cultured at 50℃ were not very sensitive to the other experimental temperature, the reduction percentage of Fe III varied little with the temperature range of 30—50℃. Concentrated Na 2CO 3 solution was added to adjust the solution pH to an optimal pH range of 6—7 The overall results revealed that the dissimilatory ferric reducing microorganisms present in the mix culture are probably neutrophilic, moderately thermophilic Fe III reducers.展开更多
研究反应条件对Fe(Ⅱ)/亚硫酸盐体系络合NO的影响规律。利用实验室分析模拟燃煤电厂烟气中NO的质量浓度。结果表明:Na_(2)SO_(3)浓度主要作用于Fe(NO)SO_(4)的还原和NO的吸收。温度对该体系的影响存在两个方面,一方面升高温度可以提高N...研究反应条件对Fe(Ⅱ)/亚硫酸盐体系络合NO的影响规律。利用实验室分析模拟燃煤电厂烟气中NO的质量浓度。结果表明:Na_(2)SO_(3)浓度主要作用于Fe(NO)SO_(4)的还原和NO的吸收。温度对该体系的影响存在两个方面,一方面升高温度可以提高NO的脱除效果,另一方面加快了反应的进行,使得快速达到反应平衡。O_(2)体积分数对NO的脱除效果起着重要作用,直接影响该体系的降解趋势。一种是无氧条件下可以使该体系长时间处于有效的络合NO效果,另一种是2.5%的O_(2)体积分数可以促进该体系反应初期NO的络合,进而使得NO的脱除效率最大,3 min NO的脱除效率达到90.65%,但反应末期NO的脱除效果减弱。展开更多
基金the National Natural Sci-ence Foundation of China (No. 40271067, 40741005)the Innovative Research Group Project in Northwest A &F University.
文摘Dissimilatory Fe(Ⅲ) reduction is a universal process with irreplaceable biological and environmental importance in anoxic environments. Our knowledge about Fe(Ⅲ) reduction predominantly comes from pure cultures of dissimilatory Fe(Ⅲ) reducing bacteria (DFRB). The objective of this study was to compare the effects of glucose and a selection of short organic acids (citrate, succinate, pyruvate, propionate, acetate, and formate) on Fe(Ⅲ) reduction via the anaerobic culture of three paddy soil solutions with Fe...
文摘In the system of nitric oxide removal from the flue gas by metal chelate absorption, it is an obstacle that ferrous absorbents are easily oxidized by oxygen in the flue gas to ferric counterparts, which are not capable of binding NO. By adding iron metal or electrochemical method, Fe III (EDTA) can be reduced to Fe II (EDTA). However, there are various drawbacks associated with these techniques. The dissimilatory reduction of Fe III (EDTA) with microorganisms in the system of nitric oxide removal by metal chelate absorption was investigated. Ammonium salt instead of nitrate was used as the nitrogen source, as nitrates inhibited the reduction of Fe III due to the competition between the two electron acceptors. Supplemental glucose and lactate stimulated the formation of Fe II more than ethanol as the carbon sources. The microorganisms cultured at 50℃ were not very sensitive to the other experimental temperature, the reduction percentage of Fe III varied little with the temperature range of 30—50℃. Concentrated Na 2CO 3 solution was added to adjust the solution pH to an optimal pH range of 6—7 The overall results revealed that the dissimilatory ferric reducing microorganisms present in the mix culture are probably neutrophilic, moderately thermophilic Fe III reducers.
文摘研究反应条件对Fe(Ⅱ)/亚硫酸盐体系络合NO的影响规律。利用实验室分析模拟燃煤电厂烟气中NO的质量浓度。结果表明:Na_(2)SO_(3)浓度主要作用于Fe(NO)SO_(4)的还原和NO的吸收。温度对该体系的影响存在两个方面,一方面升高温度可以提高NO的脱除效果,另一方面加快了反应的进行,使得快速达到反应平衡。O_(2)体积分数对NO的脱除效果起着重要作用,直接影响该体系的降解趋势。一种是无氧条件下可以使该体系长时间处于有效的络合NO效果,另一种是2.5%的O_(2)体积分数可以促进该体系反应初期NO的络合,进而使得NO的脱除效率最大,3 min NO的脱除效率达到90.65%,但反应末期NO的脱除效果减弱。
