Effects of different iron minerals on anaerobic digestion of cellar mud from brewing sauce-flavored liquor
By adding strong oxidizing ferrihydrite(amorphous)and weakly oxidizing but conductive mag-netite(crystalline)to the anaerobic digestion system of waste cellar mud,the changes of Fe(Ⅱ),organic matter and microbial community structure were investigated,and the effects of different types of Fe(Ⅲ)minerals on anaerobic digestion of cellar sludge were explored.The results showed that the iron reducing bacteria were enriched in the ferrihydrite group,and the Fe(Ⅱ)content increased rapidly to 900 mg/L on the twelfth day,indicating that the dissimilatory iron reduction of the ferrihydrite occurred.The chemi-cal oxygen demand(COD)removal amounts in the ferrihydrite and magnetite groups were 16.1%and 4.9%higher than that in the control group respectively,indicating that the ferrihydrite and magnetite both promoted the removal of organic matter.The magnetite group enriched Geobacter and Methanosarcina,which promoted direct interspecific electron transport(DIET),increasing methane production by 23.4%,while the dissimilatory iron reduction of ferrihydrite inhibited methanogenesis and reduced methane production by 32.2%.
anaerobic digestionFe(Ⅲ)mineralsdirect interspecific electron transportdissimilatory iron reduction
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