Anaerobic Co-digestion of Real MSW and MSWI Ashes
| Autor: | Sung-Hui Lin, 林松輝 |
|---|---|
| Rok vydání: | 2009 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 97 Sustainable development has been the core concept in the agenda of earth summit in Rio de Janeiro, Brazil in 1992. The core values have been used as the principal guidelines to resolve environmental and climate change problems at the moment in 21th century. Taiwan is a small island comprised of 26.36% plain and higher than two thirds of hill and mountain. Due to the enhancement of living standard and consumption, municipal solid waste (MSW) has increased and MSW incinerator (MSWI) has been the primary treat method for the MSW. However, the residues generated from the incineration still account for 15% of original MSW volume. They need to be treated carefully to prevent the secondary pollution. MSWI bottom ash (MSW BA) and fly ash (MSW FA) have been used as aggregate, soil amendment, back fill and co-composting. In this study, MSWI bottom ash and fly ash were co-digested with MSW to investigate their possibility as landfill cover. Anaerobic bioreactors of 30 cm height with 15 cm * 15 cm bottom area were used to simulate the landfill sites. One liter of real 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. The total 22 anaerobic bioreactors were placed on the oven maintained at 35℃. Gas production was recorded by water replacement daily. pH, ORP, EC, Sal were measured after 80 ml of leachate taken and filtration weekly. TS, VS, and COD and metals in leachate were measured monthly. Through gas production and anaerobic parameters, the suitable ratios of MSWI BA and FA with MSW co-digestion can be obtained. Results showed that gas production was found to be beneficial in soil 1500 g l-1, MSWI FA 60 g l-1, MSWI FA 40 g l-1, control, and MSWI BA 600 g l-1 bioreactors. The gas production was found to be in the order of soil 1500 g l-1 > MSWI FA 60 g l-1 > MSWI FA 40 g l-1 > control ≧ MSWI BA 600 g l-1. Other anaerobic bioreactors were found to be strongly inhibitory in the MSW digestion. pHs in the range of 6-8 were found to be suitable for MSW anaerobic digestion. Released metals in suitable range were thought to enhance the gas production. However, exact beneficial levels may need to be tested for clarity in the future work by individual metal or mixed metals added on the designated MSW anaerobic digestion. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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