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首页> 外文期刊>African Journal of Biotechnology >Inhibition of carbon disulfide on bio-desulfurization in the process of gases purification
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Inhibition of carbon disulfide on bio-desulfurization in the process of gases purification

机译：气体净化过程中二硫化碳对生物脱硫的抑制作用

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Biological desulfurization is a novel technology for the removal of hydrogen sulfide from some biogas or sour gas, in which there are always a certain amounts of carbon disulfide together with much hydrogen sulfide. Nowadays, carbon disulfide is found to have negative effect on the biological desulfurization, but seldom research is afforded to investigate how carbon disulfide inhibits the process of biological desulfurization. In this paper, we investigated the effect of carbon disulfide both on the growth of Thiobacillus thioparus and the resting cells under various concentrations, including 0.01, 0.05, 0.10, 0.15 and 0.20%. In this process, the rate of the cell growth was characterized by the rate of nitrogen consumption in order to solve the problem that the adsorption of cells to sulfur granules have on the accuracy of biomass test. Under the cell density of 23.92 mg N/L, which is lower than the maximum of cell density 36.13 mg N/L, the average rate of thiosulfate oxidation reached the maximum (26.50 S2O32- mg/L-h). Carbon disulfide at titers of 0.01% significantly inhibited the growth of cells, but hardly affected the biological desulfurization of resting cells. Although carbon disulfide at titers of 0.05% had negative effect on the biological desulfurization of resting cells, the effect of inhibition could be relieved by the increased density of resting cells. For the resting cells, the parameters of Michaelis-Menten equation were calculated by the method of Lineweaver-Burk. The Vmax of biological desulfurization was decreased from 27.93 to 14.0 S2O32- mg/L-h, and the Km was increased from 0.264 to 0.884 mM, with the concentration of carbon disulfide rising up from 0.0 to 0.1%. These results show that the growth of cells was sensitive to carbon disulfide, and the resting cells had resistance to the low level of carbon disulfide (0.05%). Thus, the inhibition of carbon disulfide to biological desulfurization should be attributed to T. thioparus growth suppression function.
机译：生物脱硫是一种从某些沼气或酸性气体中去除硫化氢的新技术，其中总是存在一定量的二硫化碳和大量的硫化氢。如今，发现二硫化碳对生物脱硫有负面影响，但是很少进行研究来研究二硫化碳如何抑制生物脱硫过程。在本文中，我们研究了二硫化碳对硫代硫杆菌（Thiobacillus thioparus）和静止细胞在不同浓度（包括0.01％，0.05％，0.10％，0.15％和0.20％）下的生长的影响。在此过程中，以氮的消耗速率来表征细胞的生长速率，以解决细胞对硫颗粒的吸附对生物质测试准确性的影响。在细胞密度为23.92 mg N / L（低于最大细胞密度36.13 mg N / L）下，硫代硫酸盐的平均氧化速率达到最大值（26.50 S2O32- mg / L-h）。滴度为0.01％的二硫化碳显着抑制细胞的生长，但几乎不影响静止细胞的生物脱硫。尽管二硫化碳浓度为0.05％对静息细胞的生物脱硫有负面影响，但是抑制作用可以通过增加静息细胞的密度来缓解。对于静止的细胞，通过Lineweaver-Burk方法计算出Michaelis-Menten方程的参数。生物脱硫的Vmax从27.93降低到14.0 S2O32- mg / L-h，Km从0.264升高到0.884 mM，二硫化碳的浓度从0.0％升高到0.1％。这些结果表明，细胞的生长对二硫化碳敏感，而静止的细胞对低水平的二硫化碳（0.05％）具有抗性。因此，二硫化碳对生物脱硫的抑制作用应归因于硫代梭菌的生长抑制功能。

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