Microbial Community Shifts during Biogas Production from Biowaste and/or Propionate.
Microbial Community Shifts during Biogas Production from Biowaste and/or Propionate.
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DOI：
10.3390/bioengineering2010035
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发表时间：
2015-02-09
期刊：
影响因子：
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通讯作者：
Gallert C
中科院分区：
文献类型：
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作者：
Li C;Moertelmaier C;Winter J;Gallert C
丙酸是厌氧消化过程中最微妙的中间体，因为它的降解在热力学上是不利的。为了确定其在厌氧消化过程中的最大可能降解率，在周一至周五的反应器中，有机负荷率（OLR）为12/14 kg COD·m−3·d−1加上丙酸，最终OLR为18 kg COD·m−3·d−1。周末不提供饲料，因为这是全面的情况。为了保持持久的高丙酸氧化活性（POA），每周提供3 kg codproonate·m−3·d−1的基本OLR +周一至周五提供11 kg codproonate·m−3·d−1。最后，反应器在周一至周五以12 kg codbiow废料·m−3·d−1的OLR运行，在周五晚上至周一早上以5 kg codproonate·m−3·d−1的OLR运行，以保持燃气发动机永久运行的恒定产气量。测定了生物垃圾+丙酸饲料的丙酸降解率（PDRs）。分析饥饿期间PDRs的下降情况。饲喂丙酸后的POA高于饲喂生物垃圾后的POA，而饲喂丙酸后的POA下降速度快于饲喂生物垃圾后的POA。测定了丙酸氧化菌群和产甲烷菌群的变化。
Propionate is the most delicate intermediate during anaerobic digestion as its degradation is thermodynamically unfavorable. To determine its maximum possible degradation rates during anaerobic digestion, a reactor was fed Monday to Friday with an organic loading rate (OLR) of 12/14 kg CODbiowaste·m−3·d−1 plus propionate up to a final OLR of 18 kg COD·m−3·d−1. No feed was supplied on weekends as it was the case in full-scale. To maintain permanently high propionate oxidizing activity (POA), a basic OLR of 3 kg CODpropionate·m−3·d−1 all week + 11 kg CODbiowaste·m−3·d−1 from Monday to Friday was supplied. Finally a reactor was operated with an OLR of 12 kg CODbiowaste·m−3·d−1 from Monday to Friday and 5 kg CODpropionate·m−3·d−1 from Friday night to Monday morning to maintain a constant gas production for permanent operation of a gas engine. The propionate degradation rates (PDRs) were determined for biowaste + propionate feeding. Decreasing PDRs during starvation were analyzed. The POA was higher after propionate supply than after biowaste feeding and decreased faster during starvation of a propionate-fed rather than a biowaste-fed inoculum. Shifts of the propionate-oxidizing and methanogenic community were determined.