Study On Biogas Production Potential Of Mango Leaves By Anaerobic Fermentation

With the shortage and overuse of fossil fuels accompanied with serious environmental problems, a clean energy source-biogas is getting more and more concerned by human beings. Mango is widely planted in south of china and there are a lot of mango leaves produce each year. Only a very small portion of mango leaves is extracted for medicinal ingredient and the most is either discarded or burned which brings serious problems to the land and the atmosphere. Using mango leaves as fermentation material, it can be converted into biogas with the microbial metabolism of microorganism, which can realize its resource utilization. This paper studied on biogas production potentional of mango leaves by anaerobic fermentation, investigated the effects of different pretreatment conditions, different fermentation conditions and mixed with pig manure to the production of biogas. The main research contents and results are as follows:(1)Using NaOH solution as alkali pretreatment, and the variation of biogas yield was studied under the different concentration of Na OH solution and different pretreatment time. The concentration of Na OH solution was 0, 0.1, 0.2, 0.3 and 0.4mol / L, and the pretreatment time was 4, 6, 8, 10 and 12 h respectively. The result showed that when the concentration of Na OH solution was 0.2mol / L, the highest rate of methane yield per TS 51.69 m L / g was achieved and the highest rate of methane yield per TS 54.33 m L / g was observed when the pretreatment time was10 h.(2)After pretreatment of mango leaves, two influence factors including feed concentration and ratio of inoculation were studied,what may have an impact on the variation of biogas yield, methane content and p H. The results showed that when inoculation volume was 20%, the concentration of fermentation concentration was in the 6% to 8%, it could get the best biogas production yield.(3) Mixing mango leaves with pig manure as the fermentation materials, the biogas yield, methane content and p H were tested in order to obtain the best mixing ratio. The result show that when the mixing ratio was 1:3(C/N:20), the best biogas production yield was obtain and the maximum accumulative gas production was 3073 mL.