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首页> 外文期刊>Waste management & research >Assessing the effects of municipal solid waste incinerator bottom ash on the decomposition of biodegradable waste using a completely mixed anaerobic reactor
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Assessing the effects of municipal solid waste incinerator bottom ash on the decomposition of biodegradable waste using a completely mixed anaerobic reactor

机译:使用完全混合厌氧反应器评估城市固体废物焚化炉底灰对可生物降解废物分解的影响

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摘要

Experimental lab scale anaerobic reactors were used to assess the effect of municipal solid waste incinerator (MSWI) bottom ash on the process of biodegradation of organic materials typical of those found n municipal solid waste (MSW). Three reactors were used in the trial and each of these received the same daily organic load of simulated MSW but varying loads of MSWI bottom ash. The reactors were monitored over a period of 200 days for pH, alkalinity, volatile acids, total organic carbon (TOC), biogas production, gas composition and heavy metals on the degradation process as there was an increase in gas production, alkalinity, and pH, coupled with a decrease in the TOC concentration of leachate when compared whit a control reactor without MSWI ash addition. After 200 days operation, the alkalinity and gas production in the anaerobic reactor receiving 6g ash per day was twice that of the rector receiving 3g of ash per day and four times that of the control reactor. A number of tests were carried out on the ash sample to investigate the possible reasons for enhancement of the biodegradative process. These included a shake flask batch leaching test using distilled water, determination of the acid neutralizing capacity by titration curve, and the quantification of six heavy metals and four light metals. In the reactors receiving ash the concentrations of Ca, Na, K, Mg ions were found to be significantly higher and these may provide a higher alkalinity which could promote the digestion process. Soluble concentrations of Cd, Cr, Cu, Ni, Pb, and Zn were in the range of 0.02-0.2, 0.01-2.5, 0.01-0.3, 0.01-1, 0.01-1.2, and 0.01-1 mgl~1 respectively and at these concentrations it is unlikely that they would prove inhibitory to the digestion process.
机译:实验规模的厌氧反应器用于评估城市固体废物焚化炉(MSWI)的底灰对典型的城市固体废物(MSW)有机材料生物降解过程的影响。在试验中使用了三个反应堆,每个反应堆每天都接受相同的模拟生活垃圾有机负荷,但生活垃圾底灰的负荷却变化。在200天的时间内对反应器进行监测,以监测其降解过程中的pH,碱度,挥发性酸,总有机碳(TOC),沼气产量,气体成分和重金属,因为产气量,碱度和pH值均有所提高当与不添加MSWI灰分的对照反应器进行比较时,再加上渗滤液TOC浓度的降低。在运行200天后,厌氧反应器中每天接收6克灰分的碱度和气体产量是每天接收3克灰分的反应器的碱度和产气量,是对照反应器的四倍。对灰分样品进行了许多测试,以研究增强生物降解过程的可能原因。其中包括使用蒸馏水的摇瓶批量浸出试验,通过滴定曲线确定酸中和能力以及对六种重金属和四种轻金属的定量。在接收灰分的反应器中,发现钙,钠,钾,镁离子的浓度明显更高,并且这些离子可提供更高的碱度,从而可以促进消化过程。 Cd,Cr,Cu,Ni,Pb和Zn的可溶性浓度分别为0.02-0.2、0.01-2.5、0.01-0.3、0.01-1、0.01-1.2和0.01-1 mgl〜1。这些浓度不太可能证明对消化过程具有抑制作用。

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