以“H”型电池为主体装置，考察和比较了有机和无机碳源对产甲烷生物阴极启动期和稳定运行期性能的影响.结果表明，有机碳源可以加速产甲烷生物阴极的形成，并使其在稳定运行期维持较高的运行性能；有机碳源条件下所形成的产甲烷生物阴极具有较好的电化学活性，当阴极电势为-0.75 V( vs. SHE)时，其电流密度可达(2.34±0.15) A/m2；通过投加有机碳源，可以实现CO2(或HCO-3)的原位供给，与无机碳源直接供给方式相比，可在一定程度上缓解气液传质限制，提高微生物的生长速率，最终使产甲烷生物阴极表面生物量是无机碳源培养下的4倍多.从微生物分析角度解释了有机碳源提高产甲烷生物阴极性能的原因.%Effects of organic carbon source( OCS) and inorganic carbon source( ICS) on the performance of methane-producing biocathodes were studied. The current density, methanation, polarization curves and bio-mass attached were investigated during both start-up and stable operating periods. The results show that OCS not only accelerated formation of the methane-producing biocathode, but improved its operating performance. As for the polarization tests, the current density of the OCS-associated biocathode could reach (2.34±0.15) A/m2 with the cathode potential poised at -0.75 V( vs. SHE) , higher than that of the ICS-associated bioca-thode. Compared to ICS addition, OCS addition could achieve in-situ supply of carbon dioxide( CO2 ) , which would alleviate gas-liquid transfer limitations and promote microorganisms' growth. In this case, the biomass attached on OCS-associated biocathode was more than 4 times as much as that on ICS-associated biocathode, further elucidating the high-performance of OCS-associated methane-producing biocathodes.
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