XUYue,LIAOHuan,ZHANGJing,et al.Methanogenesis of Edible Oil from Kitchen Waste Enhanced by Granular Activated Carbon[J].China Water & Wastewater,2022,38(11):109-114.
Methanogenesis of Edible Oil from Kitchen Waste Enhanced by Granular Activated Carbon
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第38卷
Number:
第11期
Page:
109-114
Column:
Date of publication:
2022-06-01
- Keywords:
- anaerobic digestion; direct interspecies electron transfer; kitchen waste; edible oil; microbial community composition
- Abstract:
- Direct interspecies electron transfer (DIET) was enhanced by adding granular activated carbon (GAC), so as to improve the anaerobic methanogenic efficiency of common edible oil from kitchen waste. In addition, the effect of GAC on microbial community composition was analyzed. Compared with the control group without GAC, the experimental group with GAC efficiently and stably produced methane through anaerobic digestion.During the anaerobic digestion of rapeseed oil, the acetic acid concentration in the control group reached the maximum value (7 mmol/L) on day 7 and remained basically unchanged thereafter. However, in the experimental group, the acetic acid concentration reached the maximum value (3.9 mmol/L) on day 7, and then gradually decreased to zero on day 13. Meanwhile, the maximum methane production in the experimental group was approximately 3.5 times that in the control group. Therefore, the addition of GAC promoted the degradation of acetic acid and the conversion of methane.Analysis of microbial community composition showed that a large number of bacteria (Syntrophomonas and Geobacter) that might have extracellular electron transfer function and a methanogen (Methanosarcina) that participated in DIET were enriched in the experimental group. The results suggested that the addition of GAC could enrich these three groups of microbes, and promote the formation of DIET in the rapeseed oil anaerobic digestion system through GAC as an electron carrier, thus promoting the degradation of rapeseed oil and improving the methane production.
Last Update:
2022-06-01