A perspective on hydrothermal processing of sewage sludge

Chen, Wan‐Ting; Haque, Md. Akiful; Lu, Tianjian; Aierzhati, Aersi; Reimonn, Gregory

doi:10.1016/j.coesh.2020.02.008

Cited by 74 publications

(33 citation statements)

References 48 publications

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“…Other important parameters include the heating rate, the presence of reducing gas, and the presence of added solvents (to solvolyze plastics). In addition, various types of reactors such as tubular, batch, plug‐flow, and continuous stir reactors have been reported for HTL conversion of biomass to biocrude oil [174b–d] . Although findings from biomass may be transferable to plastics, more research about the effects of reactor design, solid content, and plastics/water ratio on plastic conversion is recommended.…”

Section: Hydrothermal Liquefaction Of Plastic Waste Into Fuelsmentioning

confidence: 99%

Thermochemical Conversion of Plastic Waste into Fuels, Chemicals, and Value‐Added Materials: A Critical Review and Outlooks

et al. 2022

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Plastic waste is an emerging environmental issue for our society. Critical action to tackle this problem is to upcycle plastic waste as valuable feedstock. Thermochemical conversion of plastic waste has received growing attention. Although thermochemical conversion is promising for handling mixed plastic waste, it typically occurs at high temperatures (300–800 °C). Catalysts can play a critical role in improving the energy efficiency of thermochemical conversion, promoting targeted reactions, and improving product selectivity. This Review aims to summarize the state‐of‐the‐art of catalytic thermochemical conversions of various types of plastic waste. First, general trends and recent development of catalytic thermochemical conversions including pyrolysis, gasification, hydrothermal processes, and chemolysis of plastic waste into fuels, chemicals, and value‐added materials were reviewed. Second, the status quo for the commercial implementation of thermochemical conversion of plastic waste was summarized. Finally, the current challenges and future perspectives of catalytic thermochemical conversion of plastic waste including the design of sustainable and robust catalysts were discussed.

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Section: Hydrothermal Liquefaction Of Plastic Waste Into Fuelsmentioning

confidence: 99%

Thermochemical Conversion of Plastic Waste into Fuels, Chemicals, and Value‐Added Materials: A Critical Review and Outlooks

et al. 2022

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“…Differing from other thermochemical processes, HTC emerges as a promising method for sludge management primarily due to its ability to process wet materials without pre-drying [13,14]. Operating at relatively low temperatures of 180-250 °C [15] and short retention times [16,17], HTC is a cost-effective process [18] for converting sewage sludge to carbonaceous material with several application options such as solid fuels, adsorbents, and fertilizers [19]. These options include utilization of hydrochar produced via HTC as a solid fuel.…”

Section: Introductionmentioning

confidence: 99%

A Review on Sewage Sludge Valorization via Hydrothermal Carbonization and Applications for Circular Economy

2022

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In pursuit of establishing a circular economy, a waste-to-energy approach is gaining increasing attention. Valorization of sewage sludge constitutes a critical importance due to generation in high quantities, difficulties in disposal, and associating environmental impacts. Hydrothermal carbonization (HTC) is a relatively recent yet an acclaimed method for sewage sludge management and valorization due to process compliance with sludge characteristics. In this review, research studies are evaluated via categorization of application fields of sludge-derived HTC products such as solid fuel production, gas production, soil remediation, nutrient recovery, water treatment, and energy storage. Research findings are compiled and a network mapping is employed for the visualization of the current situation and correlation in respective fields. The potential of HTC for sewage sludge valorization and future projections concerning available techniques are assessed within the context of circular economy.

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“…For these reasons, wet thermochemical conversion technologies as hydrothermal processes gained increasingly more attention in the last decades, demonstrating to be very promising conversion routes for wet biomass wastes to energy dense bio-fuels and valuable materials. In particular, hydrothermal carbonization (HTC) was demonstrated to be efficient for very high moisture residues as sewage and agro-industrial sludge [12][13][14]. In hydrothermal processes, the organic residue is subjected to a thermal process at autogenous pressure of saturated steam in the presence of sub-critical or supercritical water [15].…”

Section: Introductionmentioning

confidence: 99%

Process Water Recirculation during Hydrothermal Carbonization of Waste Biomass: Current Knowledge and Challenges

2021

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Hydrothermal carbonization (HTC) is considered as an efficient and constantly expanding eco-friendly methodology for thermochemical processing of high moisture waste biomass into solid biofuels and valuable carbonaceous materials. However, during HTC, a considerable amount of organics, initially present in the feedstock, are found in the process water (PW). PW recirculation is attracting an increasing interest in the hydrothermal process field as it offers the potential to increase the carbon recovery yield while increasing hydrochar energy density. PW recirculation can be considered as a viable method for the valorization and reuse of the HTC aqueous phase, both by reducing the amount of additional water used for the process and maximizing energy recovery from the HTC liquid residual fraction. In this work, the effects of PW recirculation, for different starting waste biomasses, on the properties of hydrochars and liquid phase products are reviewed. The mechanism of production and evolution of hydrochar during recirculation steps are discussed, highlighting the possible pathways which could enhance energy and carbon recovery. Challenges of PW recirculation are presented and research opportunities proposed, showing how PW recirculation could increase the economic viability of the process while contributing in mitigating environmental impacts.

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A perspective on hydrothermal processing of sewage sludge

Cited by 74 publications

References 48 publications

Thermochemical Conversion of Plastic Waste into Fuels, Chemicals, and Value‐Added Materials: A Critical Review and Outlooks

Thermochemical Conversion of Plastic Waste into Fuels, Chemicals, and Value‐Added Materials: A Critical Review and Outlooks

A Review on Sewage Sludge Valorization via Hydrothermal Carbonization and Applications for Circular Economy

Process Water Recirculation during Hydrothermal Carbonization of Waste Biomass: Current Knowledge and Challenges

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