Elements partitioning during thermal conversion of sewage sludge

Ronda, A.; Gómez–Barea, Alberto; Haro, Pedro; Almeida, Vanessa F. de; Salinero, Jesús

doi:10.1016/j.fuproc.2019.01.001

Cited by 35 publications

(27 citation statements)

References 40 publications

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“…15. The CO 2 promotes the CO release signicantly and inhibits the release of HCN, NH 3 and CH 4 when CO 2 concentration increase from 0 to 25 vol%. The CO is conrmed to be one of the dominant reactive species during NO reduction.…”

Section: The Mechanism Of the Effect Of Co 2 Concentration On No Redumentioning

confidence: 99%

“…As a byproduct of municipal sewage treatment, the rapid growth of sewage sludge production causes severe environmental problems. [1][2][3] It is worth noting that the caloric value of sewage sludge exceeds the minimum requirement for alternative fuels in the cement industry (>6250 J g À1 ). Meanwhile, sewage sludge contains inorganics (CaO, SiO 2 , Al 2 O 3 , Fe 2 O 3 , MgO) and other components of cement.…”

Section: Introductionmentioning

confidence: 99%

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Mechanistic study on NO reduction by sludge reburning in a pilot scale cement precalciner with different CO₂ concentrations

et al. 2019

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An experimental study on the effects of CO 2 concentration on the release of reducing gases and the NO reduction efficiency by sludge reburning was carried out in a pilot scale cement precalciner. The results indicate that sludge reburning shows an ideal NO reduction activity. The best NO reduction efficiency of 54% is reached when the CO 2 concentration is 25 vol%. Characteristic analysis of the sludge shows that the main types of reducing gases generated by sludge reburning are HCN, NH 3 , CO and CH 4 . Among them, CO 2 concentration plays a crucial role in the release of HCN, CO and CH 4 . The mechanistic study indicates that NO reduction is dominated by homogeneous reduction during the sludge reburning process, in particular the reducing gases of CO and NH 3 have significant influences on the NO reduction. Meanwhile, the effect of CO 2 concentration on NO reduction is mainly due to the difference in CO release. The results of the present study not only provide insight into the mechanism of NO reduction by sludge reburning, but could also contribute to the development of NO X removal technology in the cement industry.

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Section: The Mechanism Of the Effect Of Co 2 Concentration On No Redumentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Mechanistic study on NO reduction by sludge reburning in a pilot scale cement precalciner with different CO₂ concentrations

et al. 2019

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“…Simultaneously, the metal mass fraction must ideally be concentrated in a controlled and predictable way in one of these products. The metal partition in the different streams will determine the destiny of the product, and low concentrations may render it useful for further processing (compost material, catalyst material, or energy recovery), while high concentrations will limit downstream processing or must include another mass transfer operation to separate the metal fraction [36][37][38].…”

Section: Thermochemical Treatmentsmentioning

confidence: 99%

Coupling Plant Biomass Derived from Phytoremediation of Potential Toxic-Metal-Polluted Soils to Bioenergy Production and High-Value by-Products—A Review

et al. 2021

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Phytoremediation is an attractive strategy for cleaning soils polluted with a wide spectrum of organic and inorganic toxic compounds. Among these pollutants, heavy metals have attracted global attention due to their negative effects on human health and terrestrial ecosystems. As a result of this, numerous studies have been carried out to elucidate the mechanisms involved in removal processes. These studies have employed many plant species that might be used for phytoremediation and the obtention of end bioproducts such as biofuels and biogas useful in combustion and heating. Phytotechnologies represent an attractive segment that is increasingly gaining attention worldwide due to their versatility, economic profitability, and environmental co-benefits such as erosion control and soil quality and functionality improvement. In this review, the process of valorizing biomass from phytoremediation is described; in addition, relevant experiments where polluted biomass is used as feedstock or bioenergy is produced via thermo- and biochemical conversion are analyzed. Besides, pretreatments of biomass to increase yields and treatments to control the transfer of metals to the environment are also mentioned. Finally, aspects related to the feasibility, benefits, risks, and gaps of converting toxic-metal-polluted biomass are discussed.

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“…The results of the elemental analysis and physical properties of the dried sludges and catalytic material obtained are shown in Table 1. With a prior drying process can be observed that the optimal drying temperature is 120 • C for L1 and L2 and 100 • C for L3, the differences in the drying temperature can be due at the presence of different compounds and additives on the sludges [29][30][31].…”

Section: Sludge and Catalyst Characterizationmentioning

confidence: 99%

Catalytic Cracking of Heavy Crude Oil over Iron-Based Catalyst Obtained from Galvanic Industry Wastes

et al. 2020

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Sewage sludge from the galvanic industry represents a problem to the environment, due to its high metal content that makes it a hazardous waste and must be treated or disposed of properly. This study aimed to evaluate the sludge from three galvanic industries and determine its possible use as catalysts for the synthesis of materials. Catalyst was obtained from a thermal process based on dried between 100–120 °C and calcination of sludges between 400 to 700 °C. The physical–chemical properties of the catalyst were analyzed by several techniques as physisorption of N2 and chemisorption of CO of the material. Catalytic activity was analyzed by thermogravimetric analysis of a thermo-catalytic decomposition of crude oil. The best conditions for catalyst synthesis were calcination between 400 and 500 °C, the temperature of reduction between 750 and 850 °C for 15 min. The catalytic material had mainly Fe as active phase and the specific surface between 17.68–96.15 m2·g−1, the catalysts promote around 6% more weight-loss of crude oil in the thermal decomposition compared with assays without the catalyst. The results show that the residual sludge of galvanic industries after thermal treatment can be used as catalytic materials due to the easiness of synthesis procedures required, the low E-factor obtained and the recycling of industrial waste promoted.

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Elements partitioning during thermal conversion of sewage sludge

Cited by 35 publications

References 40 publications

Mechanistic study on NO reduction by sludge reburning in a pilot scale cement precalciner with different CO₂ concentrations

Mechanistic study on NO reduction by sludge reburning in a pilot scale cement precalciner with different CO₂ concentrations

Coupling Plant Biomass Derived from Phytoremediation of Potential Toxic-Metal-Polluted Soils to Bioenergy Production and High-Value by-Products—A Review

Catalytic Cracking of Heavy Crude Oil over Iron-Based Catalyst Obtained from Galvanic Industry Wastes

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Elements partitioning during thermal conversion of sewage sludge

Cited by 35 publications

References 40 publications

Mechanistic study on NO reduction by sludge reburning in a pilot scale cement precalciner with different CO2 concentrations

Mechanistic study on NO reduction by sludge reburning in a pilot scale cement precalciner with different CO2 concentrations

Coupling Plant Biomass Derived from Phytoremediation of Potential Toxic-Metal-Polluted Soils to Bioenergy Production and High-Value by-Products—A Review

Catalytic Cracking of Heavy Crude Oil over Iron-Based Catalyst Obtained from Galvanic Industry Wastes

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Mechanistic study on NO reduction by sludge reburning in a pilot scale cement precalciner with different CO₂ concentrations

Mechanistic study on NO reduction by sludge reburning in a pilot scale cement precalciner with different CO₂ concentrations