Lo H M, Liu M H, Pai T Y, Liu W F, Lin C Y, Wang S C, Banks C J, Hung C H, Chiang C F, Lin K C, Chen P H, Chen J K, Chiu H Y, Su M H, Kurniawan T A, Wu K C, Hsieh C Y, Hsu H S
Department of Environmental Engineering and Management, Chaoyang University of Technology, 168, Jifong East Road, Wufong, Taichung County, Taiwan.
J Hazard Mater. 2009 Mar 15;162(2-3):1233-42. doi: 10.1016/j.jhazmat.2008.06.028. Epub 2008 Jun 18.
Municipal solid waste incinerator (MSWI) fly ash has been examined for possible use as landfill interim cover. For this aim, three anaerobic bioreactors, 1.2m high and 0.2m in diameter, were used to assess the co-digestion or co-disposal performance of MSW and MSWI fly ash. Two bioreactors contained ratios of 10 and 20 g fly ash per liter of MSW (or 0.2 and 0.4 g g(-1) VS, that is, 0.2 and 0.4 g fly ash per gram volatile solids (VS) of MSW). The remaining bioreactor was used as control, without fly ash addition. The results showed that gas production rate was enhanced by the appropriate addition of MSWI fly ash, with a rate of approximately 6.5l day(-1)kg(-1)VS at peak production in the ash-added bioreactors, compared to approximately 4l day(-1)kg(-1)VS in control. Conductivity, alkali metals and VS in leachate were higher in the fly ash-added bioreactors compared to control. The results show that MSW decomposition was maintained throughout at near-neutral pH and might be improved by release of alkali and trace metals from fly ash. Heavy metals exerted no inhibitory effect on MSW digestion in all three bioreactors. These phenomena indicate that proper amounts of MSWI fly ash, co-disposed or co-digested with MSW, could facilitate bacterial activity, digestion efficiency and gas production rates.
城市固体垃圾焚烧炉（MSWI）飞灰已被研究用于填埋场临时覆盖的可能性。为此，使用了三个高1.2米、直径0.2米的厌氧生物反应器来评估城市固体垃圾（MSW）与MSWI飞灰的共消化或共处置性能。两个生物反应器中每升MSW含有10克和20克飞灰（或0.2和0.4克克⁻¹挥发性固体，即每克MSW挥发性固体（VS）含有0.2和0.4克飞灰）。其余的生物反应器用作对照，不添加飞灰。结果表明，适当添加MSWI飞灰可提高产气速率，在添加飞灰的生物反应器中，产气峰值时的速率约为6.5升天⁻¹千克⁻¹VS，而对照中的速率约为4升天⁻¹千克⁻¹VS。与对照相比，添加飞灰的生物反应器中渗滤液的电导率、碱金属和VS更高。结果表明，MSW的分解在整个过程中保持在近中性pH值，并且可能通过飞灰中碱和痕量金属的释放而得到改善。在所有三个生物反应器中，重金属对MSW消化均未产生抑制作用。这些现象表明，与MSW共处置或共消化的适量MSWI飞灰可促进细菌活性、消化效率和产气速率。
