College of Bioengineering, Qilu University of Technology (Shandong Academy of Sciences), Jinan 250353, PR China.
College of Environmental Science and Engineering, Qilu University of Technology (Shandong Academy of Science), Jinan 250353, PR China.
Bioresour Technol. 2022 Mar;347:126689. doi: 10.1016/j.biortech.2022.126689. Epub 2022 Jan 8.
Some inhibition of biomethane (bioCH) production system can be observed, which is due to the propionic acid generation from lactic acid degradation. In this work, the three cobalt ferrate-based nanoparticles (NPs) such as CoFeO, CoAlFeO and CoCuFeO were synthesized to promote the bioCH evolution from lactic acid. The CH yields from the CoAlFeO, CoCuFeO and CoFeO groups at 300 mg/L of NPs were 431.52, 392.12 and 396.6 mL/g lactic acid, respectively. Moreover, the highest CH yield was 34.15% higher than that of the control reactor (321.67 mL/g lactic acid) without NPs. The three NPs accelerated lactic acid biodegradation and propionic acid conversion, thus obtaining more CH. Surprisingly, microbial structure revealed that CoAlFeO increased the abundance of Bacteroidetes_vadinHA17 to 16.6%, promoting the conversion from propionic acid to acetic acid. Meanwhile, the abundance of Methanobacterium in archaeal community from CoAlFeO group rose from 45.81% to 68.45%, which facilitated bioCH production.
一些生物甲烷（bioCH）生产系统会受到抑制，这是由于乳酸降解产生丙酸。在这项工作中，合成了三种基于钴铁酸盐的纳米粒子（NPs），如 CoFeO、CoAlFeO 和 CoCuFeO，以促进乳酸产生的生物 CH 演变。在 NPs 浓度为 300mg/L 的 CoAlFeO、CoCuFeO 和 CoFeO 组中，CH 的产率分别为 431.52、392.12 和 396.6mL/g 乳酸。此外，最高 CH 产率比没有 NPs 的对照反应器（321.67mL/g 乳酸）高出 34.15%。三种 NPs 加速了乳酸生物降解和丙酸转化，从而获得更多的 CH。令人惊讶的是，微生物结构表明 CoAlFeO 将拟杆菌属_vadinHA17 的丰度增加到 16.6%，促进了丙酸向乙酸的转化。同时，CoAlFeO 组中古菌群落中甲烷杆菌的丰度从 45.81%上升到 68.45%，这有利于生物 CH 的产生。
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