Effectiveness of fly ash on the stabilization/solidification of Zn-contaminated soil

• Autorzy: Chen Yan , Zhu Shengyuan , Fang Wei , Huang He , Qin Hao , Hu Shengtao , Wu Yuzhao

Identyfikatory

DOI

10.37190/epe230302

• Języki publikacji: EN

Abstrakty

EN

As a solid waste, the associated disposal cost of fly ash is really high. Previous studies suggested that the utilization of fly ash to treat heavy metal-contaminated soils was a new cost-effective method of disposal of it. Therefore, the effectiveness of fly ash stabilized/solidified Zn-contaminated soils has been investigated by unconfined compressive strength (UCS) and toxicity characteristics leaching procedure (TCLP) tests. Quantitative analysis of the soil microstructure was conducted by processing the X-ray diffraction (XRD) and scanning electron microscope (SEM) images. Mercury intrusion porosimetry (MIP) was carried out to illustrate the size and proportion of pore size for specimens under different ratios. The results of the tests showed an improvement in the UCS, which further increased as the content of binders was raised. Binder content would have little influence on the development of strength if the binder content exceeds a threshold value. The leached Zn²⁺ concentration of stabilized specimens was significantly decreased compared to that of untreated. Quantitative analysis confirmed that the addition of the binders resulted in the amount of hydration product, reduction of porosity, and a really random pores orientation, which was responsible for the improvement of the strength and leaching properties of the Zn²⁺ contaminated soils.

Słowa kluczowe

EN

fly ash; soil; heavy metals; X-ray diffraction; Zn2+

PL

popiół lotny; gleba; metale ciężkie; dyfrakcja rentgenowska; Zn2+

• Wydawca: Oficyna Wydawnicza Politechniki Wrocławskiej
• Czasopismo: Environment Protection Engineering
• Rocznik: 2023
• Tom: Vol. 49, nr 3
• Strony: 15--29
• Opis fizyczny: Bibliogr. 25 poz., rys., tab.

Twórcy

autor

Chen Yan

• China Jikan Research Institute of Engineering Investigations and Design Co., Ltd., No. 51, Xianning Middle Road, Xi’an, 710043, China

autor

Zhu Shengyuan

• China Jikan Research Institute of Engineering Investigations and Design Co., Ltd., No. 51, Xianning Middle Road, Xi’an, 710043, China

autor

Fang Wei

• China Jikan Research Institute of Engineering Investigations and Design Co., Ltd., No. 51, Xianning Middle Road, Xi’an, 710043, China

autor

Huang He

• China Jikan Research Institute of Engineering Investigations and Design Co., Ltd., No. 51, Xianning Middle Road, Xi’an, 710043, China

autor

Qin Hao

• School of Resource and Environmental Engineering, Hefei University of Technology, Tunxi Road 193#, Baohe District, Hefei, 230009, China

autor

Hu Shengtao

• School of Resource and Environmental Engineering, Hefei University of Technology, Tunxi Road 193#, Baohe District, Hefei, 230009, China

autor

Wu Yuzhao

• School of Resource and Environmental Engineering, Hefei University of Technology, Tunxi Road 193#, Baohe District, Hefei, 230009, China

Bibliografia

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