Role of inherent active constituents on mercury adsorption capacity of chars from four solid wastes

Li, Guoliang; Wang, Yafei; Tang, Yi; Shen, Boxiong

doi:10.1016/j.cej.2016.08.106

Cited by 56 publications

(19 citation statements)

References 38 publications

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“…In previous study, the difference of MRE resulting from lime injection in dry or semidry scrubbing system was proved to be low 1% since inorganic material (lime) has poor adsorption capacity for mercury. ,, Moreover, the MRE of lime injection is relatively low (<22%), which is hard to determine the overall MRE (33.6–95.2%) of current APCD combinations. Instead, previous studies proved that the AC injection performed excellent adsorption capacity for mercury since the gas mercury could transform into Hg P on physical and chemical adsorption sites of AC. − Then the particulate matter is captured via subsequent fabric filter. Therefore, the correlation of the MRE and AC injection amount was calculated, fitted and shown in SI Figure S3.…”

Section: Resultsmentioning

confidence: 99%

Improving Flue Gas Mercury Removal in Waste Incinerators by Optimization of Carbon Injection Rate

Duan

et al. 2018

Environ. Sci. Technol.

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This study tested the mercury emission characteristics of six municipal solid waste incinerators (MSWIs) and recommended future mercury control via adjusting operational parameters. The results indicated that over 99% of the mercury in solid wastes ended in fly ash and flue gas, of which 3.3-66.3% was emitted to air through stack gas. Mercury in the stack gas was mainly in the form of oxidized mercury (Hg), the proportion (65.4-89.0%) of which was far higher than previous estimation (15%). Mercury removal efficiencies (MRE) of the tested incinerators were in the range of 33.6-95.2%. The impact of waste incineration capacity, gas flow, fly ash yield, and activated carbon (AC) injection on MRE were analyzed. We found that the MRE was significantly linearly correlated to the ratio of AC injection and fly ash yield (correlation coefficient = 0.98, significance <0.01). AC injection value is determined based on the control of dioxin emissions without considering mercury control in traditional design. To increase MRE of MSWIs, the AC injection should increase from around 100 mg·Nm to 135 mg·Nm for grate furnace combustor and 170 mg·Nm for circulation fluidized bed combustor, so as to reach a MRE of 90%.

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Section: Resultsmentioning

confidence: 99%

Improving Flue Gas Mercury Removal in Waste Incinerators by Optimization of Carbon Injection Rate

Duan

et al. 2018

Environ. Sci. Technol.

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“…Related studies have shown that a larger specific surface area and the total pore volume help Hg 0 physical adsorption . Similarly, from Table S1, it can be seen that modification also increases the specific surface area and volume of the micropores, which greatly increases the physical adsorption capacity of the mercury sorbent to Hg 0 because the micropores are typically Hg 0 physical adsorption sites …”

Section: Resultsmentioning

confidence: 58%

“…31 Similarly, from Table S1, it can be seen that modification also increases the specific surface area and volume of the micropores, which greatly increases the physical adsorption capacity of the mercury sorbent to Hg 0 because the micropores are typically Hg 0 physical adsorption sites. 8 Similarly, modification can enrich the number of functional groups on the surface of an adsorbent. In the FTIR test results shown in Figure S1, the peak intensities of modified corn straw char at 598, 1107, 1601, and 3250 cm −1 are all enhanced.…”

Section: Resultsmentioning

confidence: 99%

“…Mercury removal using a biomass adsorbent is an emerging mercury control technology, and it is considered as an ideal substitute for active carbon because of its cheapness, accessibility, and similar characteristics to those of active carbon. − Biomass materials have a considerable research value in engineering. Corn is one of the most common biomass materials in China.…”

Section: Introductionmentioning

confidence: 99%

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Interference Effect of H₂O on Hg⁰ Removal by a Mercury Sorbent in an Oxyfuel-Combustion Atmosphere

Ran

Wang

et al. 2021

Ind. Eng. Chem. Res.

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The H 2 O concentration in an oxyfuel-combustion atmosphere is higher than that in a traditional combustion atmosphere, which will affect the mercury removal process. Therefore, it is necessary to carry out a research on the interference effect of H 2 O on mercury removal under an oxyfuelcombustion atmosphere. In this paper, corn straw char was modified by NH 4 Cl, and related experiments were carried out using a fixed-bed reaction system. The characterization results of the sorbent showed that the modification enhanced its physical and chemical adsorption capacities. The addition of H 2 O in a NO atmosphere was not conducive to mercury removal but could alleviate the toxicity of SO 2 on the adsorbent in a SO 2 atmosphere. The coexistence of H 2 O and NO significantly inhibited the mercury removal, but some nitrate ions were generated during the process, which slightly weakened the negative effects of H 2 O. The coexistence of low-concentration H 2 O and SO 2 would weaken the poisoning effect of SO 2 on the mercury sorbent, and high-content H 2 O would react to generate excess H 2 SO 4 to block the surface pores. SO 3 could assist Hg 0 oxidation, while H 2 O would hinder the transformation of SO 2 into SO 3 . In a HCl atmosphere, highconcentration H 2 O (20%) inhibited mercury removal, while lower-concentration H 2 O (5−15%) showed an opposite behavior. The low concentration of H 2 O did not affect the oxidation of Hg 0 by HCl, and it was accompanied by the formation of substances conducive to mercury removal. The increase of the H 2 O concentration would hinder the oxidation reaction of HCl and Hg 0 .

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“…In addition, the anchoring of sulfur on ACs was not firm, hence causing leaching risks of sulfur as well as mercury adsorption products when ACs were disposed of in landfills [32,34]. Therefore, a new strategy is urgently undergoing exploration to overcome the disadvantages associated with sulfur-impregnated ACs [35,36].…”

Section: Introductionmentioning

confidence: 99%

A Molten-Salt Pyrolysis Synthesis Strategy toward Sulfur-Functionalized Carbon for Elemental Mercury Removal from Coal-Combustion Flue Gas

Yang

Meng

et al. 2022

Energies

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The emission of mercury from coal combustion has caused consequential hazards to the ecosystem. The key challenge to abating the mercury emission is to explore highly efficient adsorbents. Herein, sulfur-functionalized carbon (S-C) was synthesized by using a molten-salt pyrolysis strategy and employed for the removal of elemental mercury from coal-combustion flue gas. An ideal pore structure, which was favorable for the internal diffusion of the Hg0 molecule in carbon, was obtained by using a SiO2 hard template and adjusting the HF etching time. The as-prepared S-C with an HF etching time of 10 h possessed a saturation Hg0 adsorption capacity of 89.90 mg·g−1, far exceeding that of the commercial sulfur-loaded activated carbons (S/C). The S-C can be applied at a wide temperature range of 25–125 °C, far exceeding that of commercial S/C. The influence of flue gas components, such as SO2, NO, and H2O, on the Hg0 adsorption performance of S-C was insignificant, indicating a good applicability in real-world applications. The mechanism of the Hg0 removal by S-C was proposed, i.e., the reduced components, including sulfur thiophene, sulfoxide, and C-S, displayed a high affinity toward Hg0, which could guarantee the stable immobilization of Hg0 as HgS in the adsorbent. Thus, the molten-salt pyrolysis strategy has a broad prospect in the application of one-pot carbonization and functionalization sulfur-containing organic precursors as efficient adsorbents for Hg0.

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Role of inherent active constituents on mercury adsorption capacity of chars from four solid wastes

Cited by 56 publications

References 38 publications

Improving Flue Gas Mercury Removal in Waste Incinerators by Optimization of Carbon Injection Rate

Improving Flue Gas Mercury Removal in Waste Incinerators by Optimization of Carbon Injection Rate

Interference Effect of H₂O on Hg⁰ Removal by a Mercury Sorbent in an Oxyfuel-Combustion Atmosphere

A Molten-Salt Pyrolysis Synthesis Strategy toward Sulfur-Functionalized Carbon for Elemental Mercury Removal from Coal-Combustion Flue Gas

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Role of inherent active constituents on mercury adsorption capacity of chars from four solid wastes

Cited by 56 publications

References 38 publications

Improving Flue Gas Mercury Removal in Waste Incinerators by Optimization of Carbon Injection Rate

Improving Flue Gas Mercury Removal in Waste Incinerators by Optimization of Carbon Injection Rate

Interference Effect of H2O on Hg0 Removal by a Mercury Sorbent in an Oxyfuel-Combustion Atmosphere

A Molten-Salt Pyrolysis Synthesis Strategy toward Sulfur-Functionalized Carbon for Elemental Mercury Removal from Coal-Combustion Flue Gas

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Interference Effect of H₂O on Hg⁰ Removal by a Mercury Sorbent in an Oxyfuel-Combustion Atmosphere