Chemical and geotechnical properties of solidified/stabilized MSWI fly ash disposed at a landfill in China

Xu, Hui; JianDong, Miao; Chen, Ping; Zhan, Liangtong; Wang, Yu-ze

doi:10.1016/j.enggeo.2019.04.019

Cited by 40 publications

(9 citation statements)

References 47 publications

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“…The effect of particle size increasing was also observed in the MSWI fly ash treated by other materials. Xu et al [42] reported that the d 50 of MSWI fly ash stabilized and solidified by using an organic chelator and lime was 7~20 times of the original fly ash, this value is much larger than that treated by MICP in this paper. This is thought to be related to the much significant effects of binding and wrapping in the former one.…”

Section: Resultsmentioning

confidence: 52%

Microbial induced solidification and stabilization of municipal solid waste incineration fly ash with high alkalinity and heavy metal toxicity

Chen

Hao

et al. 2019

PLoS ONE

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This paper presents an experimental study on the applicability of microbial induced carbonate precipitation (MICP) to treat municipal solid waste incineration (MSWI) fly ash with high alkalinity and heavy metal toxicity. The experiments were carried out on fly ashes A and B produced from incineration processes of mechanical grate furnace and circulating fluidized bed, respectively. The results showed that both types of fly ashes contained high CaO content, which could supply sufficient endogenous Ca for MICP treatment. Moreover, S. pasteurii can survive from high alkalinity and heavy metal toxicity of fly ash solution. Further, the unconfined compressive strength (UCS) of MICP treated fly ashes A and B reached 0.385MPa and 0.709 MPa, respectively. The MICP treatment also resulted in a reduction in the leaching toxicity of heavy metals, especially for Cu, Pb and Hg. MICP had a higher solidification and stabilization effect on fly ash B, which has finer particle size and higher Ca content. These findings shone a light on the possibility of using MICP technique as a suitable and efficient tool to treat the MSWI fly ash.

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Section: Resultsmentioning

confidence: 52%

Microbial induced solidification and stabilization of municipal solid waste incineration fly ash with high alkalinity and heavy metal toxicity

Chen

Hao

et al. 2019

PLoS ONE

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“…Furthermore, the effective stress in this layer is relatively large (Zhang et al, 2019). Therefore, the waste in this layer are more homogenous than the upper layers (Xu et al, 2019;Hu et al, 2021).…”

Section: Comparison Of Mathematical Model and Eld Experiments Resultsmentioning

confidence: 99%

Field investigation and numerical modelling of gas extraction in a heterogeneous landfill with high leachate level

Xie

Fei

et al. 2022

Environ Sci Pollut Res

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A eld gas extraction experiment is carried out at a high-kitchen food large-scale land ll site with high leachate level. The leachate level was decreased to improve the gas extraction e ciency. Considering the heterogeneity of the municipal solid waste (MSW), the voids in the unsaturated MSW are divided into matrix pores and fractures. A transient dual-porosity model was then developed to analyze the pumping test results. The rst and second boundary conditions considering the effect of cover layers of land lls was involved. The results show that the gas ow rate can be increased by 14%-25% due to the drawdown of the leachate level. Compared with the single pore model, the dual-porosity model can better predict the eld results, indicating that the preferential ow in the land ll caused by the heterogeneity of MSWs is very important. As the pumping pressure increases by 5 times, the ratio of fractures to pores w f can be decreased by 4.4 times. This may be due to the fact that the fractures will be compressed when the effective stress was increased as the negative pumping pressure was applied. The pumping pressure and the anisotropy value of the MSWs have the greater in uence on the well radius of in uence. The proposed model can be used for effective design of the eld gas pumping experiments. The obtained gas generation rate, gas permeability of the dual porosity MSWs can be useful for gas transport analysis and gas pumping well design for the high-kitchen food content land lls.

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“…The total elemental content, determined through acid digestion for BFA, SFA-F, SFA-O, SFA-D, and SFA-N samples, is presented in Table 3. Generally, the decrease in content between SFA-F and the road test samples can be attributed to the leaching processes caused by natural rainfall, which results in the dissolution of readily soluble mineral phases and soluble chloride [28,62]. Specifically, the road test samples exhibited lower Na content than the fresh SFA-F sample.…”

Section: Characterization Of Samplesmentioning

confidence: 99%

Long-Term Leaching Behavior and Geochemical Modeling of Cement Solidified Incineration Fly Ash Containing Waste Tires and Wood Biomass

2023

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Waste incineration is a widely used treatment method, and sustainable approaches are required to properly recycle large volumes of incineration ash to reduce environmental impacts and landfill space consumption. Studies have focused on the potential of recycling incineration ash as a replacement for natural aggregates in civil engineering applications, such as road construction. However, industrial waste incineration ash, such as waste tire incineration ash, contains hazardous heavy metals, such as lead and zinc that pose potential environmental threats. Moreover, few studies have investigated the leachability of these hazardous metals after long-term natural aging. This study investigates the long-term evolution of leachate chemistry, mineralogical transformation, and heavy metal fixation performance of a recycled roadbed material using ash from industrial waste incineration of waste tires and biomass (SFA). Additionally, field samples from a five-year pilot test site utilizing SFA were also examined. Regulatory leaching tests showed that the concentrations of Cd, Pb, As, T-Cr, and Ni were all below permissible limits even after five years of utilization. Long-term column leaching experiment results indicated that, compared to the total content of the SFA material, the leaching ratios of Pb, T-Cr, Cu, and Zn were 27%, 12%, 5%, and 0.1%, respectively. The SFA pH-stat leaching test results demonstrated that the mass release of the total content of heavy metals was relatively minimal, even under acidic pH conditions (pH < 4). Finally, profiles of pH and major ions in leachate from the column leaching experiment were simulated using HYDRUS HP1, implementing a dual-porosity modeling approach. In conclusion, despite containing hazardous heavy metals, SFA exhibits significantly low leaching rates over a long-term period.

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Chemical and geotechnical properties of solidified/stabilized MSWI fly ash disposed at a landfill in China

Cited by 40 publications

References 47 publications

Microbial induced solidification and stabilization of municipal solid waste incineration fly ash with high alkalinity and heavy metal toxicity

Microbial induced solidification and stabilization of municipal solid waste incineration fly ash with high alkalinity and heavy metal toxicity

Field investigation and numerical modelling of gas extraction in a heterogeneous landfill with high leachate level

Long-Term Leaching Behavior and Geochemical Modeling of Cement Solidified Incineration Fly Ash Containing Waste Tires and Wood Biomass

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