Hydrothermal Carbonization of Autoclaved Municipal Solid Waste Pulp and Anaerobically Treated Pulp Digestate

Reza, M. Toufiq; Coronella, Charles J.; Holtman, Kevin M.; Franqui-Villanueva, Diana; Poulson, Simon R.

doi:10.1021/acssuschemeng.6b00160

Cited by 59 publications

(18 citation statements)

References 37 publications

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“…On the other hand, the hydrolysis of proteins in the raw SSL and the consequent formation of amides during pyrolysis and HTC are the reasons that this peak is also associated with the N-H stretching vibrations [50]. The band between 3000 cm −1 and 2800 cm −1 is ascribed to asymmetric -CHx (2925 cm −1 ) and symmetric -C-H (2850 cm −1 ) aliphatic carbons in methylene groups [51]. There are no obvious differences between the aliphatic groups present after both thermochemical processes and the originals found in the raw SSL.…”

Section: The Ph Of Biocharsmentioning

confidence: 99%

Combustion Characteristics of Hydrochar and Pyrochar Derived from Digested Sewage Sludge

et al. 2020

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In this paper, hydrochars and pyrochars were produced at 260 °C under different residence times (2 and 4 h) using anaerobic digested sewage sludge (SSL) as initial feedstock. The effect of reaction time on the fuel properties of hydrochars and pyrochars was evaluated. Moreover, the combustion kinetics of raw SSL and the derived pyrochars and hydrochars without coal blending were determined at two different air flows (20 and 90 mL/min) and compared. In the same conditions, the yield of hydrochar was significantly lower than that of pyrochar, confirming the different reaction pathways followed in each process. The results showed hydrochars have lower carbon recovery and energy yield than pyrochars, making the latter more suitable for energy purposes. The thermogravimetric combustion study showed that both thermochemical treatments increased the ignition temperature but decreased the burnout temperature, which results in higher stability during handling and storage. However, raw SSL is better for combustion than hydrochar according to the combustibility index. In addition, the kinetic study showed that the activation energy of the combustion of biochars, especially pyrochar, is lower than that of raw SSL, which is advantageous for their combustion.

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Section: The Ph Of Biocharsmentioning

confidence: 99%

Combustion Characteristics of Hydrochar and Pyrochar Derived from Digested Sewage Sludge

et al. 2020

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“…As far as municipal anaerobically digested sewage sludge (ADSS) is concerned, both the HTC solid and liquid by-products have been characterized, following the fate of carbon [ 23 ], nitrogen and phosphorus [ 33 , 81 , 96 ] in the product streams. The speciation of phosphorus in sludge and hydrochar has been thoroughly studied [ 76 , 94 ]. Kim et al [ 32 ] showed that HTC can be used to successfully treat ADSS, producing a carbonaceous solid product, hydrochar, with a lower moisture content and HHV than the raw digestate, making it a viable alternative to fossil solid fuels.…”

Section: Hydrothermal Carbonization Of Digestatementioning

confidence: 99%

“…Recently, digestate from organic fraction of municipal solid waste (OFMSW) was treated by HTC by Reza et al [ 94 ], obtaining an energy–dense solid hydrochar and a process water with mainly organic acids and amino acids. Zhou et al [ 97 ] underlined in their study the synergistic effect of the combination of AD and HTC, in order to evaluate a sustainable treatment for food waste in China.…”

Section: Hydrothermal Carbonization Of Digestatementioning

confidence: 99%

“…Process liquids from HTC are dark in color [ 94 ], a yellowish to dark brownish liquid [ 59 ]. Recently, Xu and Jiang [ 69 ], treating urban sewage sludge, reported that the color can be used as a crucial index to evaluate the purification of the process water, as it can be associated with the dissolution and decomposition of organic matter during HTC.…”

Section: Hydrothermal Carbonization Process Water Characterizationmentioning

confidence: 99%

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Process Waters from Hydrothermal Carbonization of Sludge: Characteristics and Possible Valorization Pathways

Langone

Basso

2020

IJERPH

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Hydrothermal carbonization (HTC) is an innovative process capable of converting wet biodegradable residues into value-added materials, such as hydrochar. HTC has been studied for decades, however, a lack of detailed information on the production and composition of the process water has been highlighted by several authors. In this paper the state of the art of the knowledge on this by-product is analyzed, with attention to HTC applied to municipal and agro-industrial anaerobic digestion digestate. The chemical and physical characteristics of the process water obtained at different HTC conditions are compared along with pH, color, organic matter, nutrients, heavy metals and toxic compounds. The possibility of recovering nutrients and other valorization pathways is analyzed and technical feasibility constraints are reported. Finally, the paper describes the main companies which are investing actively in proposing HTC technology towards improving an effective process water valorization.

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“…Hydrothermal carbonization (HTC) is an emerging technology for producing biofuels and upgrading solid fuels [15][16][17][18]. It conveniently uses residual moisture of the feedstocks as the reaction medium due to its solvent properties at high temperatures and pressures [19].…”

Section: Introductionmentioning

confidence: 99%

Hydrothermal Carbonization of Various Paper Mill Sludges: An Observation of Solid Fuel Properties

et al. 2019

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Each year the pulp and paper industries generate enormous amounts of effluent treatment sludge. The sludge is made up of various fractions including primary, secondary, deinked, fiber rejects sludge, etc. The goal of this study was to evaluate the fuel properties of the hydrochars produced from various types of paper mill sludges (PMS) at 180 °C, 220 °C, and 260 °C. The hydrochars, as well as the raw feedstocks, were characterized by means of ultimate analysis, proximate analysis, moisture, ash, lignin, sugar, and higher heating value (HHVdaf) measurements. Finally, combustion indices of selected hydrochars were evaluated and compared with bituminous coal. The results showed that HHVdaf of hydrochar produced at 260 °C varied between 11.4 MJ/kg and 31.5 MJ/kg depending on the feedstock. This implies that the fuel application of hydrochar produced from PMS depends on the quality of feedstocks rather than the hydrothermal carbonization (HTC) temperature. The combustion indices also showed that when hydrochars are co-combusted with coal, they have similar combustion indices to that of coal alone. However, based on the energy and ash contents in the produced hydrochars, Primary and Secondary Sludge (PPS2) could be a viable option for co-combustion with coal in an existing coal-fired power plant.

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Hydrothermal Carbonization of Autoclaved Municipal Solid Waste Pulp and Anaerobically Treated Pulp Digestate

Cited by 59 publications

References 37 publications

Combustion Characteristics of Hydrochar and Pyrochar Derived from Digested Sewage Sludge

Combustion Characteristics of Hydrochar and Pyrochar Derived from Digested Sewage Sludge

Process Waters from Hydrothermal Carbonization of Sludge: Characteristics and Possible Valorization Pathways

Hydrothermal Carbonization of Various Paper Mill Sludges: An Observation of Solid Fuel Properties

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