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Utilization of mswi fly ash as partial cement or sand substitute with focus on cementing efficiency and health risk assessment

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Frontiers of Environmental Science & Engineering 2020年第1期14卷 87-97页

作者： Lei Zheng Xingbao Gao Wei Wang Zifu Li Lingling Zhang Shikun Cheng School of Energy and Environmental Engineering University of Science and Technology Beijing.Beijing 100083China Beijing Key Laboratory of Resource-oriented Treatment of Industrial Pollutants University of Science and Technology BeijingBeijing 100083China State Key Laboratory of Environmental Criteria and Risk Assessment Chinese Research Academy of Environmental SciencesBeijing 100012China School of Environment Tsinghua UniversityBeijing 100084China

The strength of cement substituted mortar decreases with the increase in fly ash amount,whereas the strength increases when the fly ash is blended as sand substitute.A mortar with highest strength(compressive strength=30.2 Mpa;flexural strength=7.0 Mpa)was obtained when the sand replacement ratio was 0.75%.The k value(cementing efficiency)of fly ash varied between 0.36 and 0.15 for the fly ash fraction in binder between 5%and 25%.The k values of fly ash used for sand replacement were all significantly above that used for cement *** macropores assigned to the gaps between particles decreased when the fly ash was used as sand replacement,providing an explanation for the strength *** waste-extraction procedure(toxicity-sulphuric acid and nitric acid method(HJ/T 299-2007))was used to evaluate metal leaching,indicating the reuse possibility of fly ash blended *** the mortar with the mass ratio of fly ash to binder of 0.5%,the carcinogenic risks(CR)and non-carcinogenic hazard quotient(HQ)in sensitive scenario for blended mortar utilization were 9.66 x 10 and 0.06,respectively;these results were both lower than the threshold values,showing an acceptable health *** CR(9.89 x 105)and HQ(3.89)of the nonsensitive scenario for fly ash treatment exceeded the acceptable threshold values,indicating health risks to onsite *** main contributor to the carcinogenic and non-carcinogenic risk is Cr and Cd,*** CR and HQ from inhalation was the main route of heavy metal exposure.

关键词： mswi fly ash Cementing efficiency Health risk assessment of heavy metal Sand replacement Cement replacement

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Chlorine removal from mswi fly ash by thermal treatment: Effects of iron/aluminum additives

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Journal of Environmental Sciences 2020年第2期32卷 112-121页

作者： Kaixing Zhao Yuyan Hu Yuyi Tian Dezhen Chen Yuheng Feng Thermal and Environmental Engineering Institute School of Mechanical EngineeringTongji UniversityShanghai 200092China

The high content of alkali chlorides in municipal solid waste incineration(mswi) fly ash limit its resource reuse due to the potential environmental *** this paper, with superheated steam as the gasifying agent and inducer, chlorides in fly ash were removed by thermal treatment within a moderate temperature *** treatment experiments were performed under different conditions: temperature(500–800℃), steam addition(mass ratio of steam to fly ash = 0.25–1) and residence time(0.5–3 hr).Iron and aluminum powders were added to fly ash to improve the chlorine removal ***-soluble chlorides included Na Cl and KCl, and insoluble chlorides mainly included Ca(OH)*** heating process with the addition of water steam was more efficient than that without steam in terms of the removal performance of water-soluble *** removal efficiency of soluble chlorides reached 75.25% for a mass ratio of 1:1 after 1-hr thermal treatment at 700℃.When the residence time was increased above 1 hr, the total dechlorination efficiency was not increased ***, adding iron and aluminum powder into the fly ash improved the removal of water-insoluble chlorides, and the total dechlorination efficiency was increased by 11.41%–16.64%.

关键词： mswi fly ash Chloride Thermal treatment Superheated steam Additive

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Degradation of PCDD/Fs in mswi fly ash using a microwave-assisted hydrothermal process

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Chinese Journal of Chemical Engineering 2019年第7期27卷 1708-1715页

作者： Qili Qiu Xuguang Jiang Guojun Lü Zhiliang Chen Shengyong Lu Mingjiang Ni Jianhua Yan Xiaobing Deng State Key Laboratory of Clean Energy Utilization Zhejiang UniversityHangzhou 310027China Hangzhou Lijia Environmental Services Co. Ltd.Hangzhou 311101China

In this work,microwave treatment was introduced to a hydrothermal treatment process to degrade PCDD/Fs(Polychlorinated dibenzo-p-dioxins and dibenzofurans)in municipal solid waste incineration(mswi)fly *** process additives(NaOH,Na2 HPO4,H2 O),temperatures(150℃,185℃,220℃)and reaction times(1 h,2 h,3 h)were investigated to identify their effect on the disposal of fly ash samples through orthogonal ***-resolution gas chromatography–mass spectrometry(HRGC/MS)was applied to determine the PCDD/F concentrations in mswi fly *** experimental results revealed that 83.7%of total PCDD/Fs was *** temperature was the most important factor for the degradation of the total PCDD/*** direct destruction and chlorination reactions(the chlorination degree of PCDFs increased)took part in the degradation of PCDD/Fs in fly ash,which was a new *** PCDD/F indexes determined by the concentration of indicative congeners were found to quantitatively characterize the dioxin toxicity of the fly ***,heavy metals in the fly ash sample were solidified using microwave-assisted hydrothermal treatment,which provided an experimental basis for the simultaneous disposal of dioxins and heavy ***,the microwave-assisted hydrothermal process should be considered for the future disposal of mswi fly ash.

关键词： Dioxins Degradation mswi fly ash Hydrothermal treatment Microwave

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Optimizing Non-Ferrous Metal Value from mswi Bottom Ashes

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Journal of Environmental Protection 2011年第5期2卷 564-570页

作者： Simon P. M. Berkhout Bert P.M. Oudenhoven Peter C. Rem 不详

The bottom ashes resulted annually from the incineration of municipal solid waste in Europe contain about 400,000 tonnes of metallic aluminium and 200,000 tonnes of heavy non-ferrous metals, such as copper and zinc. Efficient recovery of this non-ferrous metal resource requires state-of-the-art separation technologies and a continuous feedback of laboratory analyses of the metal products and the depleted bottom ash to the operators of the bottom ash treatment plants. A methodology is presented for the optimization of the production of non-ferrous metal value from Municipal Solid Waste Incinerator bottom ash. Results for an incineration plant in the Netherlands show that efficient recycling can have a significant impact on value recovery as well as on non-ferrous metal recycling rates, producing up to 8% more revenue and 25% more metals from the ash.

关键词： Urban Mining Solid Waste mswi Bottom Ash Non-Ferrous Metals

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Production of glass-ceramics using Municipal solid waste incineration fly ash

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Rare Metals 2019年第3期38卷 245-251页

作者： Wen-Di Fan Bo Liu Xun Luo Jian Yang Bin Guo Shen-Gen Zhang Institute for Advanced Materials and Technology University of Science and Technology Beijing

Municipal solid waste incineration(mswi) fly ash is a by-product from municipal waste *** to incomplete statistics, each year more than one million tons mswi fly ash was produced in China. Owing to high heavy elements content, widely used disposal methods of landfill are not suitable for mswi fly ash treatment. In this study, by using mswi fly ash as raw materials, glassceramics was synthesized for the solidification of heavy metals and waste recycle. Process parameters, including composition, heat treatment temperature and time, were studied and optimized. Under optimizing conditions, the product has good properties of density of 3.42 g·cm^(-3) and Vickers hardness of 6.91 GPa. Moreover, the leaching concentration of heavy metal elements meets allowable values of toxicity characteristic leaching procedure(TCLP).This study offers an alternative for mswi fly ash recycle.

关键词： mswi fly ash Glass-ceramics Heavy metal Solidification Recycling

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垃圾焚烧厂周围环境空气和土壤中PCDD/Fs及其源解析

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新疆大学学报（自然科学版） 2016年第2期33卷 192-197页

作者：孙杰陈志海张先玉聂继华曹骞黄聪张舒宇江苏力维检测科技有限公司江苏无锡214000 苏州大学医学部公共卫生学院江苏苏州215000

文章建立了PCA源解析和PCDDs/PCDFs比值相结合的源解析方法,对我国福建省某工业园区生活垃圾焚烧厂(mswi)周围的环境空气和土壤中四氯~八氯代二恶英(2,3,7,8-PCDD/Fs)含量和分布特征进行了分析,结果表明,在环境空气和土壤中PCDD/Fs含量... 详细信息

文章建立了PCA源解析和PCDDs/PCDFs比值相结合的源解析方法,对我国福建省某工业园区生活垃圾焚烧厂(mswi)周围的环境空气和土壤中四氯~八氯代二恶英(2,3,7,8-PCDD/Fs)含量和分布特征进行了分析,结果表明,在环境空气和土壤中PCDD/Fs含量变化范围分别为0.437 4~0.936 4 pg/m^3(0.033~0.046 pg ITEQ/m^3)和265.53~598.07 ng/kg(1.424~2.231 ng I-TEQ/kg).此外,土壤样品中08CDD单体在PCDD/Fs中的贡献率变化范围为93.18%~97.51%.分别采用PCA源解析和环境空气、土壤中PCDDs/PCDFs比值分析,结果均说明K4点外不受热源影响,其他取样点都受到热源的影响.最后计算17种单体的逸度值分析PCDD/Fs在土壤和环境空气中传递情况,得出了PCDD/Fs净含量由环境空气传递到土壤中的重要结论.

关键词：新源解析方法 mswi 环境空气土壤 PCDD/Fs PCA 逸度值

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生活垃圾焚烧炉渣作为道路基层材料的耐久性能评价

生活垃圾焚烧炉渣作为道路基层材料的耐久性能评价

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作者：李翠苏州科技学院

学位级别：硕士

随着当今社会的快速发展,生活垃圾越来越多,而垃圾处理场地是有限的,因此生活垃圾的减量化处理成为当今人们关注的焦点。生活垃圾焚烧炉渣(简称mswi)是生活垃圾焚烧处理后的主要产物之一,它含有部分具有胶凝活性的成分,将mswi用于基层... 详细信息

随着当今社会的快速发展,生活垃圾越来越多,而垃圾处理场地是有限的,因此生活垃圾的减量化处理成为当今人们关注的焦点。生活垃圾焚烧炉渣(简称mswi)是生活垃圾焚烧处理后的主要产物之一,它含有部分具有胶凝活性的成分,将mswi用于基层水泥土或渣土中可以达到强化材料强度和提高材料稳定性的作用。在以往的研究中讨论了mswi作为路基材料的适用性、变形性质及对周边环境的影响等方面。但是对于mswi用于道路基层材料的耐久性能,目前的研究很少,针对这一问题,本文进行了以下几个方面的工作。首先,通过物理试验、静力学试验得到了掺入mswi的混合土的物理力学性质,进而分析了mswi的掺入对混合土的物理力学性质的影响;然后,根据研究的目的进行了动三轴试验,主要包括动变形试验和疲劳破坏试验。研究了土在循环周期荷载作用的回弹模量MR、阻尼比λ的变化规律,从变形性质、能量耗散、疲劳寿命三个角度分析了掺入mswi的混合土在循环周期荷载作用下的变化规律,同时与原料土和水泥土进行比较,分析土体的耐久性能;最后,在试验的基础上,利用损伤力学的方法建立了材料的损伤演化方程,并得到了材料的损伤本构模型,进而评价了掺入mswi的混合土的耐久性能。

关键词： mswi 回弹模量能量耗散疲劳试验损伤力学

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