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Microbial community study of municipal solid waste incinerator anaerobic digestor adding municipal solid waste incinerator bottom ash/fly ash
Su, Ming Hao
從生物產氣結果發現，在焚化爐底灰添加比例為100 g/l對厭氧消化作用有促進之效果，可加速微生物之生長代謝，並由甲烷菌群之比例發現，甲烷化效果優於空白組；而由添加之兩種焚化爐飛灰比例—10 g/l和20 g/l之產氣結果來看，相較於空白組，此兩種飛灰添加比例皆對厭氧消化作用有促進之效果，刺激厭氧消化微生物之活性，使消化反應加速進行，並由甲烷菌群之含量推知甲烷化效果優於空白組。
另外，在甲烷菌群之分佈比例變化發現，hydrogenotrophic methanogens在添加灰燼的環境所佔總菌群的比例高於aceticlastic methanogens，特別尤以Methanobacteriales為最明顯，表示在添加灰燼的環境裡應有較為旺盛的產氫活動。以及會和甲烷菌競爭共同基質(H2和acetate)之硫酸鹽還原菌(SRB)含量明顯低於總甲烷菌群之含量，亦即在此環境下，甲烷菌群可佔有優勢，SRB之存在並不會影響厭氧消化作用進行。
Currently, a large amount of municipal solid waste is produced through various activities. Landfill has been practiced as the major treatment method in Taiwan. However, this treatment method is extremely constrained to the condiotions that the land is very scarce and the population density is very high in Taiwan. Thus, municipal solid waste incinerator is inevitably chosen as an effectively alternative for MSW treatment. Furthermore, the residues generated from the incinerator still remain 10 % of initial MSW weight and need to be treated further to prevent the secondary pollution. Generally, residues of incinerator are composed of bottom ash and fly ash.
Recently, some researches were confirmed that these ashes could be used as a soil cover in landfill and had positive advantage for anaerobic digestion in landfill. However, we know very little regarding the microbial communities in such treatment method. Therefore, molecular technique of fluorescence in situ hybridization (FISH) was applied to investigate microbial community in this study. Combined with the parameter of digestors and VFA concentration, the effect of the microorganisms in anaerobic digestion was explored.
According to the result of biogas production amount, the bottom ash addition in the ash/refuse ratio of 100 g/l and the fly ash addition in the ash/refuse ratio of 10 g/l and 20 g/l showed a beneficial effects on anaerobic digestion and accelerated the metaboism of microoranisms and methanogenesis was better than contorl reactors.
It was also shown that the proportion of hydrogenotrophic methanogens in all microorganisms were more abundant than aceticlastic methanogens, in which Methanobacterials were dominant hydrogenotrophic methanogens. This indicated that there were vigorous hydrogen production in the reactor adding ashes. And the proportion of sulfate reducing bacteria (SRB) which can compete common substate (H2 and acetate) with methanogens was lower than methanogens, suggesting that SRB would not outcompete methanogens in such evironment and the existence of SRB won't effect the process of anaerobic digestion.
If addition of ashes in landfill was optimum, incinerator bottom ash and fly ash could be used as a soil cover. It had positive beneficial effect to stimunate the process of anaerobic digestion and it could increase the efficiency of methanogenesis. Therefore, the method of codigestion of MSW and ashes was demonstrated a efficicent way for biological resouces.
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