电子竞争对甲烷作为电子供体还原铬酸盐的影响。
The effect of electron competition on chromate reduction using methane as electron donor.
机构信息
College of Environmental and Resource Science, Zhejiang University, Hangzhou, China.
Zhejiang Province Key Lab Water Pollut Control & Envi, Zhejiang University, Hangzhou, Zhejiang, China.
出版信息
Environ Sci Pollut Res Int. 2018 Mar;25(7):6609-6618. doi: 10.1007/s11356-017-0937-7. Epub 2017 Dec 19.
We studied the effect of electron competition on chromate (Cr(VI)) reduction in a methane (CH)-based membrane biofilm reactor (MBfR), since the reduction rate was usually limited by electron supply. A low surface loading of SO promoted Cr(VI) reduction. The Cr(VI) removal percentage increased from 60 to 70% when the SO loading increased from 0 to 4.7 mg SO/m-d. After the SO loading decreased back to zero, the Cr(VI) removal further increased to 90%, suggesting that some sulfate-reducing bacteria (SRB) stayed in the reactor to reduce Cr(VI). However, a high surface loading of SO (26.6 mg SO/m-d) significantly slowed down the Cr(VI) reduction to 40% removal, which was probably due to competition between Cr(VI) and SO reduction. Similarly, when 0.5 mg/L of Se(VI) was introduced into the MBfR, Cr(VI) removal percentage slightly decreased to 60% and then increased to 80% when input Se(VI) was removed again. The microbial community strongly depended on the loadings of Cr(VI) and SO. In the sulfate effect experiment, three genera were dominant. Based on the correlation between the abundances of the three genera and the loadings of Cr(VI) and SO, we conclude that Methylocystis, a type II methanotroph, reduced both Cr(VI) and sulfate, Meiothermus only reduced Cr(VI), and Ferruginibacter only reduced SO.
我们研究了电子竞争对甲烷（CH）基膜生物膜反应器（MBfR）中铬酸盐（Cr（VI））还原的影响，因为还原速率通常受电子供应限制。SO 的低表面负载促进了 Cr（VI）的还原。当 SO 负载从 0 增加到 4.7 mg SO/m-d 时，Cr（VI）去除率从 60%增加到 70%。当 SO 负载降低回零时，Cr（VI）去除率进一步增加到 90%，表明一些硫酸盐还原菌（SRB）留在反应器中还原 Cr（VI）。然而，高表面负载的 SO（26.6 mg SO/m-d）显著减缓了 Cr（VI）的还原，去除率仅为 40%，这可能是由于 Cr（VI）和 SO 还原之间的竞争。同样，当将 0.5 mg/L 的 Se（VI）引入 MBfR 时，Cr（VI）去除率略有下降至 60%，当再次去除输入的 Se（VI）时，去除率又增加到 80%。微生物群落强烈依赖于 Cr（VI）和 SO 的负载。在硫酸盐影响实验中，有三个属占主导地位。基于这三个属的丰度与 Cr（VI）和 SO 负载之间的相关性，我们得出结论，Methylocystis，一种 II 型甲烷营养菌，同时还原 Cr（VI）和硫酸盐，Meiothermus 仅还原 Cr（VI），而 Ferruginibacter 仅还原 SO。
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