Influence Of Mineral On Anaerobic Fermentation Of Organic Fraction Of Municipal Solid Waste (MSW)

In this paper,Organic Fraction of MSW as a nutrient source to anaerobicmicroorganisms,and PVC as an anaerobic fermentation reactor.The effects of goethiteand gypsum separate on the anaerobic fermentation of MSW,including the biogasproduction and characteristic of leachate, were investigated in the anaerobic digestersconstructed.Through analysising intermediate products Fe2+, Ca2+,SO42-, NH4+-N,NO3-N, COD,organic acid, pH,ORP,and the observation of the gas compositionthroughout the experiment.The results showed that,(1)Add goethite alone canimprove biological approximately20%of total gas production, while adding gypsumalone is relatively.Synergy goethite and gypsum can effectively reduce the bio-gasproduction is about40%of total.(2)Goethite and gypsum alone or co-existence areconducive to lower the redox potential of the system to improve the pH of the system,which help to improve the activity of anaerobic microorganisms, improved theefficiency of the anaerobic hydrolysis acidification.(3)Added goethite or gypsumalone, also with Synergy,could promote the conversion of hydrogen and organicintermediate products, thereby reduced the inhibitory effect of organic acids on theanaerobic microbes and improved the conversion efficiency of garbagedecomposition.(4)In the presence of goethite, add gypsum could promote thedissolution of goethite, anhydrite and gypsum is more than capable of dissolvinggoethite excited to make the system more iron release.(5)Goethite and gypsum in adifferent proportion of anaerobic fermentation, the leachate concentrations ofdissolved iron and sulfate is proportional to the added amount of goethite andgypsum.