New feed system for water-insoluble organic and/or highly concentrated wastewaters in the supercritical water oxidation process

Vadillo, Violeta; García-Jarana, Belén; Sánchez-Oneto, Jezabel; Portela, Juan R.; Ossa, E.J. Martı́nez de la

doi:10.1016/j.supflu.2012.09.011

Cited by 17 publications

(9 citation statements)

References 12 publications

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“…Supercritical water oxidation (SCWO) and supercritical water gasification (SCWG) are used to treat heavy oil concentration oily wastewater, such as oily sludge, and it is an alternative technology to incineration [164]. In the SCWO technique, water is utilized above its thermodynamic critical point (374 • C, 22.1 MPa) as reaction media to convert H-C-N compound to H 2 O, molecular nitrogen and CO 2 through an accelerated oxidation process in a very short time [165].…”

Section: Supercritical Water Technology (Scw)mentioning

confidence: 99%

Oily Wastewater Treatment: Overview of Conventional and Modern Methods, Challenges, and Future Opportunities

Abuhasel

Kchaou

Alquraish

et al. 2021

Water

191

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Industrial developments in the oil and gas, petrochemical, pharmaceutical and food sector have contributed to the large production of oily wastewater worldwide. Oily wastewater pollution affects drinking water and groundwater resources, endangers aquatic life and human health, causes atmospheric pollution, and affects crop production. Several traditional and conventional methods were widely reported, and the advantages and limitations were discussed. However, with the technology innovation, new trends of coupling between techniques, use of new materials, optimization of the cleaning process, and multiphysical approach present new paths for improvement. Despite these trends of improvement and the encouraging laboratory results of modern and green methods, many challenges remain to be raised, particularly the commercialization and the global aspect of these solutions and the reliability to reduce the system’s maintenance and operational cost. In this review, the well-known oily wastewater cleaning methods and approaches are being highlighted, and the obstacles faced in the practical use of these technologies are discussed. A critical review on the technologies and future direction as the road to commercialization is also presented to persevere water resources for the benefit of mankind and all living things.

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Section: Supercritical Water Technology (Scw)mentioning

confidence: 99%

Oily Wastewater Treatment: Overview of Conventional and Modern Methods, Challenges, and Future Opportunities

Abuhasel

Kchaou

Alquraish

et al. 2021

Water

191

View full text Add to dashboard Cite

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“…One of the main challenges regarding biomass feedstock management is pumping the highly concentrated and twophase biomass feedstock in supercritical and subcritical conditions. In addition, the feedstock concentration varies during the operation as well as occasionally containing solid particles [129,157,158]. The dry matter content in the biomass feedstock should be within the pumpability limits of high-pressure pumps to avoid clogging problems while optimizing the product yields versus the energy required to heat the feedstock.…”

Section: Pumpability Of the Feedstock Versus Concentrationmentioning

confidence: 99%

“…Nevertheless, the particle size does not have a significant impact on the process chemistry; therefore, it is sufficient to confirm the pumpability of the feedstock with its particle size [160]. In addition, a concentrated feedstock can also be mixed with a dilute waste to control the reactor inlet concentration, as applied in a SCWO pilot plant [157]. Furthermore, the aqueous phase after product separation can be recycled to the reactor in SCWG and HTL processes.…”

Section: Pumpability Of the Feedstock Versus Concentrationmentioning

confidence: 99%

Analysis of operational issues in hydrothermal liquefaction and supercritical water gasification processes: a review

Ghavami

Özdenkçi

Salierno

et al. 2021

Biomass Conv. Bioref.

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Biomass is often referred to as a carbon–neutral energy source, and it has a role in reducing fossil fuel depletion. In addition, biomass can be converted efficiently into various forms of biofuels. The biomass conversion processes involve several thermochemical, biochemical, and hydrothermal methods for biomass treatment integration. The most common conversion routes to produce biofuels include pyrolysis and gasification processes. On the other hand, supercritical water gasification (SCWG) and hydrothermal liquefaction (HTL) are best suitable for converting biomass and waste with high moisture content. Despite promising efficiencies, SCWG and HTL processes introduce operational issues as obstacles to the industrialization of these technologies. The issues include process safety aspects due to operation conditions, plugging due to solid deposition, corrosion, pumpability of feedstock, catalyst sintering and deactivation, and high production costs. The methods to address these issues include various reactor configurations to avoid plugging and optimizing process conditions to minimize other issues. However, there are only a few studies investigating the operational issues as the main scope, and reviews are seldomly available in this regard. Therefore, further research is required to address operational problems. This study reviews the main operational problems in SCWG and HTL. The objective of this study is to enhance the industrialization of these processes by investigating the operational issues and the potential solutions, i.e., contributing to the elimination of the obstacles. A comprehensive study on the operational issues provides a holistic overview of the biomass conversion technologies and biorefinery concepts to promote the industrialization of SCWG and HTL.

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“…The oxidation reactions took place at a high rate and released a significant amount of heat after the addition to the reactor of the third stream, the oxidant. This feed system allows the SCWO process to remain energy self-sufficient [96].…”

Section: Supercritical Water Oxidationmentioning

confidence: 99%

Functional Materials for Waste-to-Energy Processes in Supercritical Water

et al. 2021

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In response to increasing energy demand, various types of organic wastes, including industrial and municipal wastewaters, or biomass wastes, are considered reliable energy sources. Wastes are now treated in supercritical water (SCW) for non-fossil fuel production and energy recovery. Considering that SCW technologies are green and energetically effective, to implement them on a large scale is a worldwide interest. However, issues related to the stability and functionality of materials used in the harsh conditions of SCW reactors still need to be addressed. Here we present an overview on materials used in the SCW technologies for energy harvesting from wastes. There are catalysts based on metals or metal oxides, and we discuss on these materials’ efficiency and selectivity in SCW conditions. We focus on processes relevant to the waste-to-energy field, such as supercritical water gasification (SCWG) and supercritical water oxidation (SCWO). We discuss the results reported, mainly in the last decades in connection to the current concept of supercritical pseudo-boiling (PB), a phenomenon occurring at the phase change from liquid-like (LL) to gas-like (GL) state of a fluid. This review aims to be a useful database that provides guidelines for the selection of the abovementioned functional materials (catalysts, catalyst supports, and sorbents) for the SCW process, starting from wastes and ending with energy-relevant products.

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New feed system for water-insoluble organic and/or highly concentrated wastewaters in the supercritical water oxidation process

Cited by 17 publications

References 12 publications

Oily Wastewater Treatment: Overview of Conventional and Modern Methods, Challenges, and Future Opportunities

Oily Wastewater Treatment: Overview of Conventional and Modern Methods, Challenges, and Future Opportunities

Analysis of operational issues in hydrothermal liquefaction and supercritical water gasification processes: a review

Functional Materials for Waste-to-Energy Processes in Supercritical Water

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