Mechanochemical remediation of PCB contaminated soil

Wang, Haizhu; Hwang, Jisu; Huang, Jun; Xu, Ying; Yu, Gang; Li, Wenchao; Zhang, Kunlun; Liu, Kai; Cao, Zhiguo; Ma, Xiaohui; Wei, Zhipeng; Wang, Quhui

doi:10.1016/j.chemosphere.2016.10.073

Cited by 34 publications

(2 citation statements)

References 34 publications

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“…Since HEM can activate several mineral components of soil and sediments, MCD can be potentially realized by taking advantage of the "self-healing" properties of these matrices. Indeed, mechanochemical treatment of such contaminated waste without addition of co-milling reagent suffices, in some cases, to achieve entire degradation of POPs [41]. Using a reagent, typically in large amount, insures complete mineralization of the haloorganics in a reasonable time and sensibly boosts the MCD rate [42], but usually transforms the contaminated matrix in a useless waste (whose amount is in general conspicuous).…”

Section: Soils and Sedimentsmentioning

confidence: 99%

Nonthermal Mechanochemical Destruction of POPs

Cagnetta¹,

Vakili²

2022

Environmental Sciences

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The present chapter is dedicated to all relevant theoretical and application aspects of mechanochemical destruction technology for mineralization of POPs, both stockpiled ones and as contaminants in environmental and waste matrices. It will show that such solid-state technology, realized by high energy milling of POPs with a co-milling solid reagent, can achieve complete mineralization of haloorganics into graphitic/amorphous carbon, carbon oxides, and halides; it takes place at near environmental temperature, thus limiting unintentional formation of dioxins (if treatment conditions are selected carefully); and, in some cases, it can be used to produce useful materials instead of just detoxified waste. The chapter will also give a comprehensive picture of complex mechanochemical destruction mechanism, including mechanochemical activation of the co-milling reagent and the cascade of radical reactions that cause POP molecules mineralization. Finally, technological and economic considerations will be provided, which corroborate the validity and feasibility of the mechanochemical destruction as an effective and safe technology to treat POPs.

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Section: Soils and Sedimentsmentioning

confidence: 99%

Nonthermal Mechanochemical Destruction of POPs

Cagnetta¹,

Vakili²

2022

Environmental Sciences

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“…Yu et al found 95% of mirex was removed by milling with the mixture of iron powder and quartz sand, with a yield of 90.7% Cl – . Wang et al investigated the effect of additives of CaO, SiO 2 , and CaO + SiO 2 on PCB destruction via milling. Zhiliang et al utilized four additives (SiO 2 –Al, SiO 2 –Mg, SiO 2 –Fe, and MnO 2 ) for mechanochemical destruction of PCDD/Fs in fly ash, and the best performance of SiO 2 –Al was found.…”

Section: Introductionmentioning

confidence: 99%

Effect of Silica on Pyrene-Contaminated Soil Subjected to Mechanochemical Remediation

Chen

Han

Yin

et al. 2021

Ind. Eng. Chem. Res.

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Soil contaminated by polycyclic aromatic hydrocarbons (PAHs) is a common problem in the world. Mechanochemical treatment is a promising technology for remediation of PAH-contaminated soil. This study investigated the feasibility of pyrene degradation with silica by mechanochemical remediation. The effects of ball milling time and rotation speed on the removal efficiency of pyrene in soil were also studied. When the milling time was 3 h and the rotation speed was 500 rpm, the removal efficiency of pyrene in soil was over 98%. The intermediate products detected by gas chromatography–mass spectrometry proved that the hydrogenation reaction and the destruction of benzene rings occurred in the milling process. Both graphite and amorphous carbon were detected by Raman spectra. The main degradation pathway and mechanism of pyrene by mechanochemical treatment should be the destruction of benzene rings caused by free radicals and further carbonization.

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Formation of brominated and chlorinated dioxins and its prevention during a pilot test of mechanochemical treatment of PCB and PBDE contaminated soil

Lv²,

Liu

et al. 2017

Environ Sci Pollut Res

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The destruction of persistent organic pollutants (POPs) is a large challenge in particular in developing and emerging economies. To date, a detailed assessment of non-combustion technologies with respect to formation of dioxins is lacking. In this study, an assessment of mechanochemical (MC) destruction technology for polychlorinated biphenyls (PCBs) and polybrominated diphenyl ethers (PBDEs) in contaminated soil remediation was conducted. Actual applied conditions of pilot-scale MC POPs destruction process indicates that the temperature increase inside the ball mills has the potential to form high levels of toxic polybrominated and polychlorinated dibenzo-p-dioxins and dibenzofurans (PXDD/Fs) when dioxin precursors are present. Therefore, the MC technology was modified for treatment of the PCB and PBDE containing soil including an efficient cooling system which could prevent the formation of PXDD/F during the destruction of PCBs and PBDEs. This is likely relevant for all contaminated soils containing relevant dioxin precursor and need to be considered for treatment of soils with MC and probably other non-combustion technologies. Graphical abstract ᅟ.

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Mechanochemical remediation of PCB contaminated soil

Cited by 34 publications

References 34 publications

Nonthermal Mechanochemical Destruction of POPs

Nonthermal Mechanochemical Destruction of POPs

Effect of Silica on Pyrene-Contaminated Soil Subjected to Mechanochemical Remediation

Formation of brominated and chlorinated dioxins and its prevention during a pilot test of mechanochemical treatment of PCB and PBDE contaminated soil

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