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71.
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Impact of waste fuels (virgin/waste wood, mixed biofuel (peat, bark, wood chips) industrial, household, mixed waste fuel) and incineration technologies on partitioning and leaching behavior of trace elements has been investigated. Study included 4 grate fired and 9 fluidized boilers. Results showed that mixed waste incineration mostly caused increased transfer of trace elements to fly ash; particularly Pb/Zn. Waste wood incineration showed higher transfer of Cr, As and Zn to fly ash as compared to virgin wood. The possible reasons could be high input of trace element in waste fuel/change in volatilization behavior due to addition of certain waste fractions. The concentration of Cd and Zn increased in fly ash with incineration temperature. Total concentration in ashes decreased in order of Zn > Cu > Pb > Cr > Sb > As > Mo. The concentration levels of trace elements were mostly higher in fluidized boilers fly ashes as compared to grate boilers (especially for biofuel incineration). It might be attributed to high combustion efficiency due to pre-treatment of waste in fluidized boilers. Leaching results indicated that water soluble forms of elements in ashes were low with few exceptions. Concentration levels in ash and ash matrix properties (association of elements on ash particles) are crucial parameters affecting leaching. Leached amounts of Pb, Zn and Cr in > 50% of fly ashes exceeded regulatory limit for disposal. 87% of chlorine in fly ashes washed out with water at the liquid to solid ratio 10 indicating excessive presence of alkali metal chlorides/alkaline earths. 相似文献
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Assessment of the greenhouse effect impact of technologies used for energy recovery from municipal waste: A case for England 总被引:1,自引:0,他引:1
A. Papageorgiou J.R. Barton A. Karagiannidis 《Journal of environmental management》2009,90(10):2999-3012
Waste management activities contribute to global greenhouse gas emissions approximately by 4%. In particular the disposal of waste in landfills generates methane that has high global warming potential. Effective mitigation of greenhouse gas emissions is important and could provide environmental benefits and sustainable development, as well as reduce adverse impacts on public health. The European and UK waste policy force sustainable waste management and especially diversion from landfill, through reduction, reuse, recycling and composting, and recovery of value from waste. Energy from waste is a waste management option that could provide diversion from landfill and at the same time save a significant amount of greenhouse gas emissions, since it recovers energy from waste which usually replaces an equivalent amount of energy generated from fossil fuels. Energy from waste is a wide definition and includes technologies such as incineration of waste with energy recovery, or combustion of waste-derived fuels for energy production or advanced thermal treatment of waste with technologies such as gasification and pyrolysis, with energy recovery. The present study assessed the greenhouse gas emission impacts of three technologies that could be used for the treatment of Municipal Solid Waste in order to recover energy from it. These technologies are Mass Burn Incineration with energy recovery, Mechanical Biological Treatment via bio-drying and Mechanical Heat Treatment, which is a relatively new and uninvestigated method, compared to the other two. Mechanical Biological Treatment and Mechanical Heat Treatment can turn Municipal Solid Waste into Solid Recovered Fuel that could be combusted for energy production or replace other fuels in various industrial processes. The analysis showed that performance of these two technologies depends strongly on the final use of the produced fuel and they could produce GHG emissions savings only when there is end market for the fuel. On the other hand Mass Burn Incineration generates greenhouse gas emission savings when it recovers electricity and heat. Moreover the study found that the expected increase on the amount of Municipal Solid Waste treated for energy recovery in England by 2020 could save greenhouse gas emission, if certain Energy from Waste technologies would be applied, under certain conditions. 相似文献
75.
以当前我国城市生活垃圾焚烧处理现状为依据,通过文献综述法详细介绍了城市垃圾焚烧过程中重金属的迁移及分布规律,并提出重金属污染防控对策建议。 相似文献
76.
CaCO3类吸收剂净化焚烧烟气中HCI气体的研究 总被引:1,自引:0,他引:1
通常烟气中的酸性气体采用Ca(OH)2净化,然而当烟气温度在300℃以上时,Ca(OH)2喷入到烟气中将快速生成CaCO3。研究了两种CaCO3的反应特性,比较了200-900℃内CaCO3类吸收剂和Ca(OH)2与烟气中HCl气体的反应率,发现在600℃左右和800℃及以上,CaCO3类吸收剂的反应率与Ca(OH)2相当或更高;CaCO3类吸收剂、特别是改性CaCO3可替代Ca(OH)2作为干式净化HCl气体的吸收剂,合适的反应温度在600℃左右。 相似文献
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Environmental Management - 相似文献
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医疗垃圾是一种含有大量病菌、细菌及化学药剂的危险废物,它的随意排放和不当处理将造成严重的环境污染.危害人体健康。在此介绍了沈阳市拟建的医疗垃圾焚烧厂采用的两段回转窑焚烧炉处理技术的工艺流程、技术指标和设计要点。 相似文献
80.
焚烧炉及周围环境样品中多氯联苯的监测分析 总被引:3,自引:0,他引:3
对焚烧炉禁烧处理多氯联苯的效果及其周围环境样品中的多氯联苯进行了监测分析,建立了不同基体中PCBs高效毛细管色谱/质谱,气相色谱/电子捕获鉴定器检测的常规方法,燕根据对炉渣、尾气及环境样品的分析结果,认为多氯联苯的焚烧处理达到设计要求。 相似文献