Mercury emission profile for the torrefaction of sewage sludge at a full-scale plant and application of polymer sorbent

Cheng, Yingchao; Asaoka, Yuki; Hachiya, Yoshiyuki; Moriuchi, Naoki; Shiota, Kenji; Oshita, Kazuyuki; Takaoka, Masaki

doi:10.1016/j.jhazmat.2021.127186

Cited by 7 publications

(4 citation statements)

References 67 publications

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“…In recent years, there is a new material known as the sorbent polymer composite (SPC). The SPC showed a good pollutant removal effectiveness for flue gas treatment and waste water treatment, as good as that of the traditional sorbents [26]. It does not have some drawbacks of traditional sorbents such as high costs, low sorption capacities, small number of regeneration cycles, degradable characteristics, or secondary contamination.…”

Section: Introductionmentioning

confidence: 90%

The Methods and Stands for Testing Fixed Sorbent and Sorbent Polymer Composite Materials for the Removal of Mercury from Flue Gases

et al. 2022

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The most common methods of reducing mercury emissions are the use of fixed bed granular sorbents and sorbent injection. However, both of these methods have disadvantages, such as increasing the flow resistance or the need to remove the sorbent from flue gas, respectively. These disadvantages can be eliminated by using sorbents permanently bound to construction materials (fixed sorbent materials—FSMs) or mixed with construction materials (sorbent polymer composites—SPCs). The approach is unique in the world literature as well as the development of three stands and procedures enabling the testing of FSMs or SPC materials based on Tarflen as a construction material. In order to further tests of FSMs and SPCs, the system for laboratory tests and two systems for industrial tests are developed. These stands and procedures enable determination of the influence of: FSM or SPC module shapes, flue gas properties (e.g., composition, temperature, flow rate), and mercury concentration on the effectiveness of mercury removal by SPCs and FSMs. In this paper, the influence of module shapes, gas velocity, and temperature is particularly considered. In the final industrial tests, the FSM removes 99.5% Hg after 42 days and the SPC removes from 99.5% to 82.3% after 34 days.

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Section: Introductionmentioning

confidence: 90%

The Methods and Stands for Testing Fixed Sorbent and Sorbent Polymer Composite Materials for the Removal of Mercury from Flue Gases

et al. 2022

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“…The contents of heavy metals in sludge are relatively high. A study has shown that relying solely on existing wet scrubbers (WSs) and electrostatic precipitators (ESPs) is difficult to meet the requirements for mercury emissions . The concentration of each flue gas component in the reactor significantly influences the migration of mercury species .…”

Section: Factors Influencing Mercury Migration In the Clc Systemmentioning

confidence: 99%

“…A study has shown that relying solely on existing wet scrubbers (WSs) and electrostatic precipitators (ESPs) is difficult to meet the requirements for mercury emissions. 116 The concentration of each flue gas component in the reactor significantly influences the migration of mercury species. 117 Additionally, the higher concentration of fly ash generated from sludge facilitates the conversion from Hg 0 to Hg p .…”

Section: Biomass and Sludgementioning

confidence: 99%

Review and Perspectives on Mercury Release and Migration during Chemical Looping Combustion of Solid Fuels

Lyu,

Guan,

et al. 2024

Energy Fuels

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Chemical looping combustion (CLC) is a promising technology for global carbon reduction. In the CLC system, mercury released during combustion is not only a hazardous pollutant but also a risk to the system safety because mercury can easily lead to the amalgamation and fracture of the decarbonizing equipment. Understanding the mercury release and migration characteristics is the foundation for the safe operation of the CLC system. The purpose of this study is to lay the scientific foundation for achieving deep mercury removal during the CLC of solid fuels. The mercury flow and distribution within the CLC system were discussed. The differences in mercury release between CLC and conventional combustion or gasification were analyzed. The influence mechanisms of the key factors, such as fuel type, temperature, atmosphere, and oxygen carrier, on the release and migration fate of mercury during the CLC processes were discussed. The removal mechanisms of elemental mercury in the CLC system were revealed. Finally, research perspectives on mercury control in the CLC system were proposed. This review includes a comprehensive review of the latest research progress on mercury emission control within the CLC system. The findings of this study can provide guidance for the development of the deep mercury removal technology during CLC processes and help break the bottleneck which restricts the long-term safe operation of the CLC system.

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“…Torrefaction efficiency was analyzed during the process of sugarcane bagasse [55,56]. Chen et al [57] researched the impact of the torrefaction process of sewage sludge that contains the element mercury (Hg) in the sample on the environment. As a result, the 150 wet tons/day torrefaction process of the biomass sample occurred.…”

Section: Introductionmentioning

confidence: 99%

Improving Lignocellulosic and Non-Lignocellulosic Biomass Characteristics through Torrefaction Process

et al. 2022

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In this study, three locally available biomasses, namely miscanthus, hops, sewage sludge, and additionally, their mixtures, were subjected to the torrefaction process to improve their fuel properties. The torrefaction process was conducted at 250–350 °C and 10–60 min in a nitrogen (N2) environment. The torrefaction temperature and time were studied to evaluate the selected biomass materials; furthermore, heating values, mass and energy yields, enhancement factors, torrefaction severity indexes (TSI), and energy-mass co-benefit indexes (EMCI) were calculated. In addition, thermogravimetric (TGA) and Fourier transform infrared analyses (FTIR) were performed to characterize raw and torrefied biomass under the most stringent conditions (350 °C and 60 min). The results showed that with increasing torrefaction temperature and duration, mass and energy yields decreased, and heating values (HHVs) increased for all studied biomasses. The results of the TSI and EMCI indexes showed that the optimum torrefaction conditions were as follows: 260 °C and 10 min for pure miscanthus and hops, whilst this could not be confirmed for the sewage sludge. Furthermore, the combination of sewage sludge and the above-mentioned types of lignocellulosic biomass exhibited better fuel properties than sewage sludge alone.

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Mercury emission profile for the torrefaction of sewage sludge at a full-scale plant and application of polymer sorbent

Cited by 7 publications

References 67 publications

The Methods and Stands for Testing Fixed Sorbent and Sorbent Polymer Composite Materials for the Removal of Mercury from Flue Gases

The Methods and Stands for Testing Fixed Sorbent and Sorbent Polymer Composite Materials for the Removal of Mercury from Flue Gases

Review and Perspectives on Mercury Release and Migration during Chemical Looping Combustion of Solid Fuels

Improving Lignocellulosic and Non-Lignocellulosic Biomass Characteristics through Torrefaction Process

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