The influence of a washing pretreatment containing phosphate anions on single-mode microwave-based detoxification of fly ash from municipal solid waste incinerators

Ju, Yongming; Kai-ru, Zhang; Yang, Tiantian; Deng, Dongyang; Qiao, Jun-qin; Wang, Pu; You, Yan; Du, Ling; Chen, Guihua; Kołodyńska, Dorota; Dionysiou, Dionysios D.

doi:10.1016/j.cej.2020.124053

Cited by 19 publications

(7 citation statements)

References 53 publications

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“…To our best knowledge, gas-liquid-solid reactions of CO 2 with fly ash could achieve rapid transient mass transfer compared with gas-solid reactions under high pressure and high-temperature conditions [27]. However, the newly adopted thermal detoxification of dioxin in FA, including a microwave-initiated thermal process [29], could destroy the mineral carbonation and lead to the release of CO 2 . For comparison, bubbling the pure CO 2 or simulated fuel gas in effluent could theoretically remove the residual HMs, and neutralize the alkalinity [28,41,59] in an aqueous solution.…”

Section: Carbonation Mechanismmentioning

confidence: 99%

“…Our prior experiments demonstrated that washing FA could promote the dissolution of hazardous materials into the washing solution. Then, bubbling CO 2 into the aforementioned FA washing solution can effectively deposit the amphoteric HMs, including Pb, Zn, and Cu [28], and control the high alkalinity [29]. In addition, direct CO 2 capture using alkaline FA has another limitation, i.e., this process does not destroy residual dioxins and may release CO 2 during further pyrolysis of the carbonized FA.…”

Section: Introductionmentioning

confidence: 99%

“…In addition, direct CO 2 capture using alkaline FA has another limitation, i.e., this process does not destroy residual dioxins and may release CO 2 during further pyrolysis of the carbonized FA. Our prior study used a microwave (MW)-induced pyrolysis reaction to treat FA, which had been pre-treated with phosphate-containing anionic water solution [29,30]. The results demonstrated that above 99% of dioxin in FA was effectively degraded within the pyrolysis temperature varying between 380−610 • C [31].…”

Section: Introductionmentioning

confidence: 99%

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Remediation of Micro-Pollution in an Alkaline Washing Solution of Fly Ash Using Simulated Exhaust Gas: Parameters and Mechanism

Wang

Tang

et al. 2023

Sustainability

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Currently, there is an urgent need to remediate heavy metals (HMs) and high alkalinity in the washing solution of fly ash (FA). This study investigated the remediation with simulated exhaust gases of two CO2 partial pressure and revealed the removal efficiency of target pollutants, mainly including Pb ions. The results verify that under the preferred conditions of 25 °C and 15 mL/min flow rate, bubbling two kinds of simulated flue gases could efficiently remove 97.9–99.2% of Pb ions. Moreover, the initial 40 min removal of Pb ions fits in a way with a pseudo-first-order equation. Based on the thermodynamic parameters, we infer that the removal of Pb ions was a spontaneous, exothermic, and entropy-decreasing process. Furthermore, residual HMs and terminal pH after remediation of the FA washing solution basically met the regulatory threshold values of the integrated wastewater discharge standard in China (GB 8978−1996). Additionally, the particles obtained from the washing solution of FA were identified as CaCO3, which was mainly composed of vaterite and calcite crystalline. This study provides a fundamental guide for remediating multiple pollutants in the washing solution of FA and simultaneously sequestrating carbon emissions from power plants and industries.

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Section: Carbonation Mechanismmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Remediation of Micro-Pollution in an Alkaline Washing Solution of Fly Ash Using Simulated Exhaust Gas: Parameters and Mechanism

Wang

Tang

et al. 2023

Sustainability

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“…As is well known, similar to the formation of silicates, the phosphate anions can also react with metal cations especially from the transition group to form a phosphate deposit. − When compared with silicate, the same amount of phosphate anions can combine with more heavy metal ions, which increases the adsorption capacity of the sorbent. In addition, different from the formation of silicates, phosphate deposits are easier to form and have better thermal stability, , which lays a good foundation for the development of new sorbents.…”

Section: Introductionmentioning

confidence: 99%

Improving the Adsorption Capacity of the Sorbent for Gaseous PbCl₂ during Incineration by Forming Pb₃(PO₄)₂: Preparation of the Sorbent and Evaluation of Adsorption Performance

Zhang

Jin

et al. 2021

Ind. Eng. Chem. Res.

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An efficient sorbent is of great significance in the removal of volatile heavy metal vapors in the municipal solid waste incineration process. In this paper, unlike traditional sorbents based on the formation of silicate, we attempt to develop more effective sorbents by loading phosphate anions on porous montmorillonite (MMT). The adsorption experiments and UV−vis spectrum show that the PbCl 2 adsorption capacities of H 3 PO 4 @MMT and Na 2 HPO 4 @MMT reach the highest values of 0.090 and 0.078 g/ g, respectively, when the corresponding loading amounts of phosphate anions are 0.296 and 0.085 g/g, respectively. Compared with traditional sorbents, the adsorption capacity of H 3 PO 4 @ MMT increases more than 3 times. The analysis of sorbents by Fourier transform infrared (FTIR), X-ray diffraction (XRD), nitrogen adsorption and desorption experiments, and other characterization methods confirm that the loading amount of phosphate anions on H 3 PO 4 @MMT is higher than that of Na 2 HPO 4 @MMT due to the larger surface area and pore volume formed by the replacement of metal cations with protons from H 3 PO 4 . Meanwhile, the prepared sorbent also shows excellent adsorption performance for CoCl 2 and NiCl 2 . Therefore, this study lays a good foundation for the development of new sorbents for the removal of heavy metals during incineration in the future.

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“…Previous studies on water washing of IFA focused on the effects of various experimental parameters such as the liquid-to-solid ratio, washing retention time, and the frequency on Cl removal efficiency [ 22 ]. However, washing consumes a large amount of solution and produces large amounts of high-salinity wastewater, resulting in post-processing issues and increased costs of treatment.…”

Section: Introductionmentioning

confidence: 99%

Removal of Inorganic Salts in Municipal Solid Waste Incineration Fly Ash Using a Washing Ejector and Its Application for CO2 Capture

Kim

Purev

Cho

et al. 2022

IJERPH

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This study investigated the effects of washing equipment for inorganic salts, such as NaCl, KCl, and CaClOH, to decontaminate municipal solid waste incineration fly ash (MSW-IFA). Based on the feature of hydrodynamic cavitation, the device developed in this study (referred to as a ‘washing ejector’) utilizes the cavitation bubbles. A washing ejector was analyzed under a range of conditions, employing as little water as possible. In hydrodynamic cavitation, the increase in fluid pressure with increasing static pressure is mainly attributed to the increase in particle–bubble collisions via the cavitation flow. The results revealed that the fluid pressure influenced the removal of inorganic salts during cavitation in water. This is because during the washing process from the collapse of cavitation bubbles, the release is achieved through the dissolution of inorganic salts weakly bound to the surface. After treatment by a washing ejector, the removal of soluble salts elements such as Cl, Na, and K was reduced by approximately 90%. Removing the inorganic salts in the IFA altered the characteristics of the Ca-related phase, and amorphous CaCO3 was formed as the cavitation flow reacted with CO2 in the ambient air. Furthermore, the washing effluent produced by washing IFA was found to be beneficial for CO2 capture. The washing effluent was enriched with dissolved Ca from the IFA, and the initial pH was the most favorable condition for the formation of CaCO3; thus, the effluent was sufficient for use as a CO2 sequestration medium and substitute for the reuse of water. Overall, the process presented herein could be effective for removing soluble salts from IFA, and this process is conducive to utilizing IFA as a resource.

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The influence of a washing pretreatment containing phosphate anions on single-mode microwave-based detoxification of fly ash from municipal solid waste incinerators

Cited by 19 publications

References 53 publications

Remediation of Micro-Pollution in an Alkaline Washing Solution of Fly Ash Using Simulated Exhaust Gas: Parameters and Mechanism

Remediation of Micro-Pollution in an Alkaline Washing Solution of Fly Ash Using Simulated Exhaust Gas: Parameters and Mechanism

Improving the Adsorption Capacity of the Sorbent for Gaseous PbCl₂ during Incineration by Forming Pb₃(PO₄)₂: Preparation of the Sorbent and Evaluation of Adsorption Performance

Removal of Inorganic Salts in Municipal Solid Waste Incineration Fly Ash Using a Washing Ejector and Its Application for CO2 Capture

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The influence of a washing pretreatment containing phosphate anions on single-mode microwave-based detoxification of fly ash from municipal solid waste incinerators

Cited by 19 publications

References 53 publications

Remediation of Micro-Pollution in an Alkaline Washing Solution of Fly Ash Using Simulated Exhaust Gas: Parameters and Mechanism

Remediation of Micro-Pollution in an Alkaline Washing Solution of Fly Ash Using Simulated Exhaust Gas: Parameters and Mechanism

Improving the Adsorption Capacity of the Sorbent for Gaseous PbCl2 during Incineration by Forming Pb3(PO4)2: Preparation of the Sorbent and Evaluation of Adsorption Performance

Removal of Inorganic Salts in Municipal Solid Waste Incineration Fly Ash Using a Washing Ejector and Its Application for CO2 Capture

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Improving the Adsorption Capacity of the Sorbent for Gaseous PbCl₂ during Incineration by Forming Pb₃(PO₄)₂: Preparation of the Sorbent and Evaluation of Adsorption Performance