| Summary: | 碩士 === 朝陽科技大學 === 環境工程與管理系碩士班 === 98 === Abstract
This study aims at investigating the effects of different dosed ratios of bottom ash (BA), fly ash (FA) and soil on their anaerobic co-digestion with MSW in anaerobic bioreactors. Anaerobic bioreactors were 30 cm height and 15 cm square of bottom area. Anaerobic bioreactors of 22 sets (BA and MSW, FA and MSW, Soil and MSW, BA and soil and MSW, FA and soil and MSW and two controls) were employed for the experiment. One liter of MSW was placed on the bottom of the anaerobic reactors. Then, 0.6 liter of anaerobic sludge seeding was placed on it. Then, the designated MSWI BA, MSW FA and soil were placed on the anaerobic sludge seeding. This arrangement accounted for one layer and four layer of placement were used to conduct the experiment. Anaerobic bioreactors were maintained at 35℃ suitable for anaerobic digestion. Anaerobic parameters such as biogas, pH, ORP, EC, alkalinity, volatile acids, COD, TS, VS and metals were measured daily, weekly or monthly. Results showed that soil addition, particularly 1500 g/L, could enhance bacterial activity and biogas production. FA/MSW of 40 and 60 g/L could improve the MSW biodegradation and biogas production. FA dose higher 100 g/L was found to inhibit the MSW biodegradation and biogas production. BA/MSW dose of 1000 g/L showed to have the biogas enhancement potential. Results showed that biogas production was found to be beneficial in soil 1500 g/L, MSWI FA 60 g/L, MSWI FA 40 g/L, control, and MSWI BA 1000 g/L bioreactors. The biogas production was found to be in the order of soil 1500 g/L > MSWI BA 1000 g/L > MSWI FA 60 g/L > MSWI FA 40 g/L > control. Except anaerobic parameters, biogas production stimulation or inhibition was thought to be related to the released metals levels beneficial or detrimental to the anaerobic community resulting to the various MSW biodegradation and biogas production.
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