反应器顶部气体成分对光合细菌生长和产氢量的影响

Effects of different gas in headspace of reactor on PSB's growth and hydrogen production

研究了反应器顶部在CO2,N2,Ar和空气条件下对光合细菌生长和产氢量的影响.试验结果表明,光合细菌在Ar条件下具有最佳的生长和产氢能力,而N2、空气和CO2条件下的产氢量比Ar条件下分别减少了66.97%,11.64%,4.57%.当反应器顶部空气量由反应器容积的1/20增加至1/2时,其容积产氢率则由3.034 L.L-1下降到2.57 L.L-1,分别是Ar条件下的92.16%和76.07%.反应器初始状态下少量空气的存在并没有对光合细菌产氢产生完全抑制作用,因此连续制氢反应器设计中可以忽略少量空气的影响.

The effects of different gas（CO2,N2,Ar and air） on the growth and hydrogen production of PSB（Photosynthetic Bacteria） were introduced in the paper.The test results showed Ar was the best gas for PSB＇s growth and hydrogen production in the chosen gases,and N2 was disadvantage for PSB＇s growth and hydrogen production due to its inhibition on the activity of nitrogenase,and made the lag phase extend for 24 h and hydrogen yield reduced by 66.97% compared to that in the Ar atmosphere.Furthurmone,the air and CO2 made the hydrogen yield reduce by 11.64%and 4.57% respectively.The hydrogen production rate changed from 3.034 L·L-1 to 2.57 L·L-1 with air amount in the headspace of reactor ranging from 1/20 to 1/2 of the volume of reactor,which means a little air in the headspace of reactor cannot inhibit PSB＇s growth and hydrogen production completely.The effect of a little amount of air in the headspace can be ignored in designing the reactor.