投加颗粒活性炭强化餐厨垃圾的厌氧处理

通过投加颗粒活性炭（GAC）强化直接种间电子传递（DIET）进而提升餐厨垃圾的厌氧产甲烷处理效能，并研究了GAC投加导致的微生物群落变化.研究发现，投加了GAC的实验组反应器能够在更高的有机负荷下（10.4kgCOD/（m³·d））稳定运行并维持较高的甲烷产率，不投加GAC的对照组在有机负荷7.8kgCOD/（m³·d）时甲烷产率及pH值均明显降低，挥发酸大量积累，反应器酸化崩溃.微生物群落结构分析发现，GAC表面富集了大量可以胞外电子传递的细菌（占细菌丰度的34%）和可以参与DIET的产甲烷菌（占古菌丰度的88%），表明GAC的加入可以有效富集这两类微生物的生长，并可能通过GAC强化DIET促进了餐厨垃圾的厌氧消化.

Enhancing anaerobic methanogenic treatment of kitchen wastes by incorporating granular activated carbon

This paper investigated the hypothesis that enhancing anaerobic digestion of kitchen wastes by accelerating DIET through incorporating granular activated carbon (GAC).Besides,changes of microbial communities by the incorporation of GAC were also studied.The experimental results showed that,GAC reactors could operate stably with high methane production rate under the organic loading rate (OLR) as high as 10.4kgCOD/(m³·d).In contrast,for the control reactors without GAC incorporation,the methane production rate and pH declined sharply when the OLR increased to only 7.8kgCOD/(m³·d).In addition,the volatile fatty acids severely accumulated and resulted in the treatment efficiency of control reactors deteriorated.Microbial community analysis showed that bacteria capable of extracellular electron transfer (34% of bacterial community) and methanogens known to participate in DIET (88% of archaeal community) were significantly enriched on the GAC surface.It demonstrated that the addition of GAC could enrich these two groups of microbes and enhance the anaerobic digestion of kitchen waste through DIET.