Thermal-chemical conversion of sewage sludge based on waste heat cascade recovery of copper slag: Mass and energy analysis

Zuo, Zongliang; Yan, Feng; Li, Xiaoteng; Luo, Siyi; Ma, Jinshuang; Hui-ping, Sun; Bi, Xuejun; Yu, Qingbo; Zhou, Enze; Zhang, Jingkui; Guo, Jianxiang; Lin, Huan

doi:10.1016/j.energy.2021.121327

Cited by 11 publications

(4 citation statements)

References 30 publications

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“…According to data from most research presented in Table 3, the sewage sludge moisture content is often >80% when reported as received. Nevertheless, a sewage sludge moisture content in the range of 1.74-10.0%, as observed in [116,131,137,142], could be attained through drying, either via an oven at 105 • C for 24 to 72 h or air-drying for several weeks. The high moisture content in the sewage sludge promotes tar generation and incurs additional energy requirement costs.…”

Section: Sewage Sludgementioning

confidence: 99%

Biogas and Syngas Production from Sewage Sludge: A Sustainable Source of Energy Generation

Enebe

Chigor

Obileke

et al. 2023

Methane

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Sewage sludge to energy conversion is a sustainable waste management technique and a means of militating against the environmental concerns associated with its disposal. Amongst the various conversion technologies, anaerobic digestion and gasification have been identified as the two most promising. Therefore, this study is focused on a detailed evaluation of the anaerobic digestion and gasification of sewage sludge for energy production. Moreover, the key challenges hindering both technologies are discussed, as well as the practical measures for addressing them. The applicable pretreatment measures for efficient transformation into valuable energy vectors were further evaluated. Specifically, the study evaluated various properties of sewage sludge in relation to gasification and anaerobic digestion. The findings showed that a high ash content in sewage sludge results in sintering and agglomeration, while a high moisture content promotes tar formation, which has been identified as one of the key limitations of sewage sludge gasification. More importantly, the application of pretreatment has been shown to have some beneficial features in promoting organic matter decomposition/degradation, thereby enhancing biogas as well as syngas production. However, this has additional energy requirements and operational costs, particularly for thermal and mechanical methods.

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Section: Sewage Sludgementioning

confidence: 99%

Biogas and Syngas Production from Sewage Sludge: A Sustainable Source of Energy Generation

Enebe

Chigor

Obileke

et al. 2023

Methane

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“…According to the detailed degree of reaction mechanism describing the chemical reaction process, the reaction mechanism can be divided into three types: general reaction mechanism, detailed reaction mechanism, and simplified reaction mechanism ( Stanley et al, 2013 ). At present, biogas is mainly obtained by pyrolysis or gasification of biomass or other solid wastes ( Zuo et al, 2019 ; Zuo et al, 2021a ; Zuo et al, 2021b ). Biogas is usually composed of CH 4 , CO, CO 2 , and H 2 ( Pio et al, 2020 ).…”

Section: Introductionmentioning

confidence: 99%

Combustion Characteristics of Low Calorific Value Biogas and Reaction Path of NOx Based on Sensitivity Analysis

Zuo

et al. 2022

Front. Chem.

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The combustion mechanism of biogas mixture is unclear, which leads to the lack of basis for the control of operating parameters. Combustion characteristics and reaction path of typical low calorific value biogas with variation of preheating temperature and air equivalence ratio (Φ) are discussed in this paper. Preheating can not only improve the flame propagation speed and flame temperature, but also increase the proportion of NO in the product at the end of combustion flame. To some extent, improving combustion efficiency and NOx control are contradictory operating parameters. The amount of NO increases with the increase in flame distance. The maximum value of NO appears when Φ is 1.1. NO formation rate is improved by preheating the biogas. The paths of N2 → N2O →NO, N2 → NNH →NO, and N2 →NO are all enhanced. When the equivalence ratio changes from 1.0 to 0.8, NO formation rates decrease.

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“…In order to eliminate the complicated pretreatment process, this paper put forward to using granulated copper slags as precursor, which fully utilizes the waste heat of the high-temperature slag and provides a new idea to recover thermal energy from copper slag. In previous work, the dry granulation method has been proved to be a feasible way to produce copper slag particles with uniform particle diameter distribution (Zuo et al, 2020b;Zuo et al, 2021a).…”

Section: Introductionmentioning

confidence: 99%

Study on Preparation of Oxygen Carrier Using Copper Slag as Precursor

et al. 2021

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Copper slag, an important by-product of the copper smelting process, is mainly composed of 2FeO SiO2, Fe3O4, and SiO2. Due to the sufficient metal oxides, copper slag is regard as a potential oxygen carrier (OC), which can be applied in chemical looping technology. This research proposed to use the granulated copper slag particles as precursor to produce oxygen carrier. Through this method, waste heat of the high-temperature slag can be fully recovered, eliminating the complicated copper slag pretreatment process. In this paper, the reactivity of granulated copper slag after redox calcination was studied by X-ray diffractometer (XRD) and Scanning Electron Microscope (SEM), the highest reactivity occurred at 1,000°C. In addition, the oxygen release and absorption performance of OC were tested in thermal-gravimetric (TG). According to theoretical calculations, the mass loss caused by oxygen release accounts for 70.57% of the total loss and the mass reached by 4.2% at 1,000°C in oxygen absorption experiment. The copper slag modified through calcining in redox condition was proved to be a promising oxygen carrier in chemical looping process. Furthermore, the performance research on OC also provided theoretical references for the operating paraments of OC circulating between air reactor and fuel reactor in practical chemical looping processes.

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Thermal-chemical conversion of sewage sludge based on waste heat cascade recovery of copper slag: Mass and energy analysis

Cited by 11 publications

References 30 publications

Biogas and Syngas Production from Sewage Sludge: A Sustainable Source of Energy Generation

Biogas and Syngas Production from Sewage Sludge: A Sustainable Source of Energy Generation

Combustion Characteristics of Low Calorific Value Biogas and Reaction Path of NOx Based on Sensitivity Analysis

Study on Preparation of Oxygen Carrier Using Copper Slag as Precursor

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