Assessment of sewage sludge gasification in supercritical water for H2-rich syngas production

Hantoko, Dwi; Antoni, Antoni; Kanchanatip, Ekkachai; Weng, Zhouchao; Gao, Zengliang; Zhong, Yingjie

doi:10.1016/j.psep.2019.08.035

Cited by 72 publications

(13 citation statements)

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“…Hence, a lower pressure is usually preferred because of the cost of the material construction and safety concerns. The results of this study are consistent with the earlier observation by Hantoko et al…”

Section: Resultssupporting

confidence: 94%

“…At high pressure, a lower exposure time of gaseous species in the gasifier (at T = 1100 K) leads to high CO 2 and low H 2 -rich syngas production. As per Le Chatelier’s principle, gasification reactions are generally favored at lower pressure . The overall result indicates that higher pressure suppresses H 2 -rich syngas production and thus is no longer beneficial to the gasification process.…”

Section: Resultsmentioning

confidence: 80%

“…As per Le Chatelier’s principle, gasification reactions are generally favored at lower pressure. 46 The overall result indicates that higher pressure suppresses H 2 -rich syngas production and thus is no longer beneficial to the gasification process. Hence, a lower pressure is usually preferred because of the cost of the material construction and safety concerns.…”

Section: Resultsmentioning

confidence: 97%

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Chemical Kinetic Modeling of Air–Steam Gasification of Eucalyptus Wood Sawdust for H₂-Rich Syngas Production

Nath

2023

ACS Omega

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The aim of this research paper is to develop a chemical kinetic model, based on the mechanism of surface reactions, for air−steam gasification of eucalyptus wood sawdust (CH 1.63 O 1.02 ) and analyze the hydrogen-rich syngas production. Experiments are performed on a bubbling fluidized-bed gasifier using air−steam as a gasifying agent. For validation of the developed kinetic model, the outcome of the model is compared with that of experimental data, which shows a root-mean-square error of less than 4. Different parameters such as equivalence ratios (0 ≤ ER ≤ 0.4), particle size (100 ≤ Dp ≤ 1000 μm), gasification temperature (900 ≤ T ≤ 1200 K), pressure (1 ≤ P ≤ 20 atm), and steam-to-biomass ratio (0 ≤ SBR ≤ 2) are considered for the analysis. The oneparameter-at-a-time concept is employed to maximize the production of H 2 -rich syngas. Results indicate that the maximum concentration of hydrogen is 55.04 vol % (experimental) and 51.81 vol % (predicted) at optimum conditions: ER = 0, Dp = 100 μm, T = 1100 K, P = 1 atm, and SBR = 0.75. Gasification performance parameters such as hydrogen gas yield, heating values, cold gas efficiency, etc., are evaluated.

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Section: Resultssupporting

confidence: 94%

Section: Resultsmentioning

confidence: 80%

Section: Resultsmentioning

confidence: 97%

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Chemical Kinetic Modeling of Air–Steam Gasification of Eucalyptus Wood Sawdust for H₂-Rich Syngas Production

Nath

2023

ACS Omega

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“…The observed decrease in GE in our study at a temperature beyond 446 °C could be attributed to coke and carbon formation. This finding is consistent with other existing literature. , The interaction between biomass concentration and other independent variables (temperature and residence time) Figure c,e shows a similar trend whereby the maximum GE of approximately 64.15% was observed at the lowest biomass concentration of 3.0 wt %.…”

Section: Results and Discussionsupporting

confidence: 92%

Sub- and Supercritical Water Gasification of Rice Husk: Parametric Optimization Using the I-Optimality Criterion

et al. 2021

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In this study, rice husk biomass was gasified under sub- and supercritical water conditions in an autoclave reactor. The effect of temperature (350–500 °C), residence time (30–120 min), and feed concentration (3–10 wt %) was experimentally studied using the response surface methodology in relation to the yield of gasification products. The quadratic models have been suggested for both responses. Based on the models, the quantitative relationship between various operational conditions and the responses will reliably forecast the experimental outcomes. The findings revealed that higher temperatures, longer residence times, and lower feed concentrations favored high gas yields. The lowest tar yield obtained was 2.98 wt %, while the highest gasification efficiency and gas volume attained were 64.27% and 423 mL/g, respectively. The ANOVA test showed that the order of the effects of the factors on all responses except gravimetric tar yield follows temperature > feed concentration > residence time. The gravimetric tar yield followed a different trend: temperature > residence time > feed concentration. The results revealed that SCW gasification could provide an effective mechanism for transforming the energy content of RH into a substantial fuel product.

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“…Catalysts can also be used in combination with the SCWG process. Hantoko et al [235] showed that activated carbon significantly improves syngas production. Additionally, Yan et al (2019) studied the effect of the addition of Ni/Al 2 O 3 catalysts.…”

Section: Hydrogen and Syngas Productionmentioning

confidence: 99%

Towards the Implementation of Circular Economy in the Wastewater Sector: Challenges and Opportunities

Guerra-Rodríguez

Oulego

Rodríguez

et al. 2020

Water

126

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The advancement of science has facilitated increase in the human lifespan, reflected in economic and population growth, which unfortunately leads to increased exploitation of resources. This situation entails not only depletion of resources, but also increases environmental pollution, mainly due to atmospheric emissions, wastewater effluents, and solid wastes. In this scenario, it is compulsory to adopt a paradigm change, as far as the consumption of resources by the population is concerned, to achieve a circular economy. The recovery and reuse of resources are key points, leading to a decrease in the consumption of raw materials, waste reduction, and improvement of energy efficiency. This is the reason why the concept of the circular economy can be applied in any industrial activity, including the wastewater treatment sector. With this in view, this review manuscript focuses on demonstrating the challenges and opportunities in applying a circular economy in the water sector. For example, reclamation and reuse of wastewater to increase water resources, by paying particular attention to the risks for human health, recovery of nutrients, or highly added-value products (e.g., metals and biomolecules among others), valorisation of sewage sludge, and/or recovery of energy. Being aware of this situation, in the European, Union 18 out of 27 countries are already reusing reclaimed wastewater at some level. Moreover, many wastewater treatment plants have reached energy self-sufficiency, producing up to 150% of their energy requirements. Unfortunately, many of the opportunities presented in this work are far from becoming a reality. Still, the first step is always to become aware of the problem and work on optimizing the solution to make it possible.

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Assessment of sewage sludge gasification in supercritical water for H2-rich syngas production

Cited by 72 publications

References 50 publications

Chemical Kinetic Modeling of Air–Steam Gasification of Eucalyptus Wood Sawdust for H₂-Rich Syngas Production

Chemical Kinetic Modeling of Air–Steam Gasification of Eucalyptus Wood Sawdust for H₂-Rich Syngas Production

Sub- and Supercritical Water Gasification of Rice Husk: Parametric Optimization Using the I-Optimality Criterion

Towards the Implementation of Circular Economy in the Wastewater Sector: Challenges and Opportunities

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Assessment of sewage sludge gasification in supercritical water for H2-rich syngas production

Cited by 72 publications

References 50 publications

Chemical Kinetic Modeling of Air–Steam Gasification of Eucalyptus Wood Sawdust for H2-Rich Syngas Production

Chemical Kinetic Modeling of Air–Steam Gasification of Eucalyptus Wood Sawdust for H2-Rich Syngas Production

Sub- and Supercritical Water Gasification of Rice Husk: Parametric Optimization Using the I-Optimality Criterion

Towards the Implementation of Circular Economy in the Wastewater Sector: Challenges and Opportunities

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Chemical Kinetic Modeling of Air–Steam Gasification of Eucalyptus Wood Sawdust for H₂-Rich Syngas Production

Chemical Kinetic Modeling of Air–Steam Gasification of Eucalyptus Wood Sawdust for H₂-Rich Syngas Production