Inhibitory effects of CaO/Fe2O3 on arsenic emission during sewage sludge pyrolysis

Han, Hengda; Hu, Song; Li, Chaofeng; Wang, Lele; Jiang, Long

doi:10.1016/j.biortech.2016.06.075

Cited by 23 publications

(7 citation statements)

References 32 publications

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“…74 Some metal complexes formed with Ca, Fe or Si are found to be thermally stable at high temperatures. Han et al 75 After pyrolysis, HMs in biochar can exist as zerovalent metals (M 0 ), oxides, sulphides, chlorides and, to a less extent, metal complex forms. 71,72,79 The chemical speciation of HMs in biochar is an important information for downstream processing methods.…”

Section: Transformation and Recovery Of Heavy Metal(loid)s In Pyrolys...mentioning

confidence: 99%

“…Some metal complexes formed with Ca, Fe or Si are found to be thermally stable at high temperatures. Han et al 75 reported that more than 80% of As was discharged into the volatile phase during pyrolysis of sewage sludge. Comparatively, the co‐pyrolysis of sewage sludge with Fe 2 O 3 /CaO greatly inhibited the evaporation of As to 30%.…”

Section: Chemistry During the Pyrolysis Of Heavy Metal(loid) Enriched...mentioning

confidence: 99%

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A state‐of‐the‐art review of the fate of heavy metals and product properties from pyrolysis of heavy‐metal(loid)‐enriched biomass harvested from phytoextraction

Kumar

Kan

et al. 2022

Env Prog and Sustain Energy

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Vegetation has successfully been used for cleaning up metal(loid) polluted water bodies and lands through extracting and accumulating of contaminants in their aboveground biomass (phytoextraction). As this remediation technique is approaching extensive demonstration scale application and potential commercialisation, research efforts have been investigating new ways to achieve valorization of its by-products, the heavy-metal-enriched biomass (HMEB). Biomass pyrolysis as an energy conversion technique represents a key step to numerous valorization options of HMEB.During the pyrolysis of HMEB, understanding the thermal decomposition pathways, and the migration and transformation of metal(loid)s are critical for the production of clean, safe and value-added end-products. This work performs a state-of-the-art review of the studies conducted on phytoextraction and biomass pyrolysis of HMEB with emphasis on the properties of pyrolysis products as well as the behavior of heavy metal(loid)s during pyrolysis in relation to HMEB feedstock properties and the variables of the process.

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Section: Transformation and Recovery Of Heavy Metal(loid)s In Pyrolys...mentioning

confidence: 99%

Section: Chemistry During the Pyrolysis Of Heavy Metal(loid) Enriched...mentioning

confidence: 99%

A state‐of‐the‐art review of the fate of heavy metals and product properties from pyrolysis of heavy‐metal(loid)‐enriched biomass harvested from phytoextraction

Kumar

Kan

et al. 2022

Env Prog and Sustain Energy

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“…However, less As was captured by CaO at a lower temperature (T = 573 K) and higher temperatures (T = 1173 K and 1323 K). Han et al [31] also reported, CaO inhibited the As releasing more effectively than Fe 2 O 3 at 723 K. However, when it reached higher temperatures (T > 973 K), CaO did not show more excellent inhibitory effects than Fe 2 O 3 due to sulfur dioxide formed and competes with As 2 O 3 to react with CaO which would obstruct the inhibition of As 2 O 3 by CaO. Zhang et al [32] suggest that Ca and Fe provide reactive sites and act as a catalyst and reactant in the inhibition processes.…”

Section: Trace Element Inhibition Characteristic During Combustion Pr...mentioning

confidence: 99%

A Role of Mineral Oxides on Trace Elements Behavior during Pulverized Coal Combustion

et al. 2021

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The issues of trace element emissions during coal combustion has been a concern in recent years due to their environmental pollutant. To study the trace element transformation, the thermodynamic calculation (FactSage 7.2) was used. Five kinds of pure mineral oxides (Al2O3, CaO, Fe2O3, K2O, and MgO) and As, B, Cr, F, and Se in fly ash were considered for trace elements. The results confirm that all mineral oxides have a good correlation with arsenic to form Ca3(AsO4)2, FeAsO4, K3AsO4, and Mg3(AsO4)2. Boron has a good relationship with Al, Ca, and Mg to form (Al2O3)9(B2O3)2, Ca3B2O6, and Mg3B2O6. Chromium has a good correlation with K and Ca to form K2CrO4, CaCr2O4. Furthermore, FeF3(s) KF(s), and AlF3(s) are predicted from the interaction of fluorine with Fe2O3, K2O, and Al2O3. The effect of mineral oxides on selenium partitioning are not observed. The inhibition order of trace elements by mineral oxides is as follow: As (Al2O3 > MgO > CaO > Fe2O3 > K2O), B (Al2O3, CaO, Fe2O3, K2O, > MgO), Cr (CaO > K2O > Al2O3, MgO, Fe2O3), F (CaO > MgO > Al2O3 > Fe2O3 > K2O). The results will be useful to control the trace element emissions.

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“…Chen et al [19] found that As adsorption by CaO at low temperatures was mainly physical and chemical oxidation at high temperatures. Han et al [20] showed that CaO could react chemically with As 2 O 3 to form less volatile calcium-arsenic compounds, such as Ca(AsO 2 ) 2 .…”

Section: Introductionmentioning

confidence: 99%

Experimental and DFT Studies of Influence of Flue Gas Components on the Interaction between CaO and As during Sludge Combustion

Shi,

Zhang,

et al. 2024

Energies

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The problem of As pollution emission from sludge during combustion has received widespread attention. The impact of flue gas components on the interaction with CaO and As during sludge combustion was analyzed using a series of experimental characterization methods. The strength of the activity of As2O3 on the CaO(001) surface as well as on the CO2/SO2/H2O+CaO(001) surface with different O adsorption sites was revealed by combining with Density Functional Theory (DFT). According to the results, CO2 in the flue gas reacted with CaO in a reversible carbonation reaction, which optimized the pore structure of the solid phase products and promoted the capture of As by CaO. SO2 in the flue gas reacted with CaO in a sulfation reaction reaction to block the pores, which was not conducive to the capture of As by CaO. The presence of moisture led to poor pore structure collapse of the solid phase products as well as the formation of gehlenite, which reduced the enrichment of As by CaO. DFT calculations showed that the adsorption of As2O3 molecules on the CO2+CaO(001) surface was affected by the position of the O active site, and the adsorption energy at the OC1 top site was higher than that on the clean surface, which was favorable for the stable adsorption of As2O3 molecules. The existence of SO2 decreased As2O3 molecules’ adsorption energy on the CaO(001) surface, which was unfavorable for the adsorption of As2O3 molecules. There were two main effects of H2O molecules on the adsorption of As2O3 on the CaO(001) surface. One was the H2O molecules weakened the interaction between the As atoms and Osurf atoms, which was unfavorable to the adsorption of As2O3 molecules; the other was the existence of stronger adsorption of O atoms in H2O molecules on As atoms in As2O3 molecules, which made As2O3 molecules adsorbed at the top of OH0 adsorbed with adsorption energies much larger than that of clean surface, and the adsorption was more stable.

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Inhibitory effects of CaO/Fe2O3 on arsenic emission during sewage sludge pyrolysis

Cited by 23 publications

References 32 publications

A state‐of‐the‐art review of the fate of heavy metals and product properties from pyrolysis of heavy‐metal(loid)‐enriched biomass harvested from phytoextraction

A state‐of‐the‐art review of the fate of heavy metals and product properties from pyrolysis of heavy‐metal(loid)‐enriched biomass harvested from phytoextraction

A Role of Mineral Oxides on Trace Elements Behavior during Pulverized Coal Combustion

Experimental and DFT Studies of Influence of Flue Gas Components on the Interaction between CaO and As during Sludge Combustion

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