Details

Autor(en) / Beteiligte

• Ma, Jiaying
• Wei, Huawei
• Su, Yinglong
• Gu, Wenchao
• Wang, Binghan
• Xie, Bing

Titel

Powdered activated carbon facilitates methane productivity of anaerobic co-digestion via acidification alleviating: Microbial and metabolic insights

Ist Teil von

• Bioresource technology, 2020-10, Vol.313, p.123706-123706, Article 123706

Ort / Verlag

Elsevier Ltd

Erscheinungsjahr

2020

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• [Display omitted] •PAC performed better than GAC in promoting the methane production rate and yield.•PAC remarkably alleviated excess acidification by accelerating VFAs consumption.•PAC enriched key microorganisms involved in VFAs degradation and DIET.•The hydrogenotrophic and aceticlastic pathways were facilitated by GAC and PAC. Low methanogenic efficiency caused by excess acidification is a challenge during anaerobic digestion. This study indicated that both granular activated carbon (GAC) and powdered activated carbon (PAC) promoted the start-up of methanogenesis and methane output in anaerobic co-digestion of food waste and fruit-vegetable waste. Moreover, PAC performed better than GAC. Specifically, the highest cumulative methane yield and shortest lag phase were observed in 5 g/L PAC and 10 g/L PAC group, 22.0% higher and 62.5% shorter than that without activated carbon supplementation, respectively. PAC facilitated the methane productivity by effectively accelerating volatile fatty acids (VFAs) consumption and thereby alleviating acidification. Syntrophic VFAs oxidizing bacteria (Gelria and Syntrophomonas) and direct interspecies electron transfer related microorganisms (Geobacter and Methanosarcina) were remarkably enriched by PAC. Furthermore, metagenomic analysis showed that both PAC and GAC might facilitate the electron transfer between microbes by acting as the electrical bridge and enhance both hydrogenotrophic and aceticlastic pathways.