Effect of granular activated carbon on enhanced anaerobic co-digestion of winery wastewater and sewage sludge
The anaerobic co-digestion of winery wastewater and sewage sludge has the advantages of balancing substrate nutrition,alleviating toxin inhibition and increasing microbial diversity.In order to further improve the methane production efficiency,the effects of granular activated carbon(5～20 g·L-1)on methane production performance,microbial activity and microbial community structure in mesophilic(35±1)℃ anaerobic co-digestion system were investigated.The results of batch experiments showed that the optimal GAC dosage was 10 g·L-1,and the corresponding cumulative methane production could reach 283.9 mL·g-1(based on VS),which was 41.3％higher than that of the blank group.GAC addition mainly increased the cumulative methane production by stimulating the secretion of extracellular polymeric substance and degradation of organic matter.In the semi-continuous operation experiment at GAC dosage of 10 g·L-1 for 80 d,the co-digestion methanogenesis rate was(293.9±3.3)mL·(g·d)-1(based on TCOD)during the stable period,and the maximum specific methanogenic activity was 119.4 mL·(g·d)-1(based on VSS).The content of coenzyme F420 and electron transport activity increased by 29.5％and 16.7％,respectively,compared with the group without GAC addition,and GAC addition could improve the stability of the system by accelerating the degradation of propionic acid and butyric acid and adjusting pH.In addition,GAC addition promoted the abundance of Syntrophomonas,Pseudomonas and Desulfovibrio,which are syntrophic VFAs oxidizing bacteria and extracellular electron transfer bacteria,and Methanobacterium,which can be used as an electron acceptor to participate in direct interspecies electron transfer,thereby enhancing the interspecies electron transfer between bacteria and methanogens,and improving the metabolic rate of organic matter.In summary,the addition of GAC can effectively improve the co-digestion performance of winery wastewater and sewage sludge,and improve the treatment efficiency of the entire digestive system.
winery wastewatersewage sludgeanaerobic co-digestiongranular activated carboninterspecies electron transfer
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