Hydrothermal post-treatment of digestate to maximize the methane yield from the anaerobic digestion of microalgae

Nuchdang, Sasikarn; Frigon, Jean‐Claude; Roy, Caroline; Pilon, Guillaume; Phalakornkule, Chantaraporn; Guiot, Serge R.

doi:10.1016/j.wasman.2017.06.021

Cited by 36 publications

(15 citation statements)

References 22 publications

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“…Oliveira et al [ 26 ] proposed that the process waters can be recycled in the biogas plant, reducing their environmental impacts and increasing the energy efficiency of the whole process. The combined system, with AD as primary treatment and HTC as post-treatment applied to the solid digestate, has also been investigated to treat microalgae by Nuchdang et al [ 93 ], proving that applying HTC to digestate and recycling the HTC process water to the primary AD would increase methane production by 40%. The possibility to valorize the HTC process water through AD has also been considered for HTC liquor produced from anaerobically digested corn silage [ 92 ].…”

Section: Hydrothermal Carbonization Of Digestatementioning

confidence: 99%

“…Aragón-briceño et al [ 34 ] showed that HTC of process waters and slurry (hydrochar + process waters) from sewage sludge digestate at low HTC temperatures (160–220 °C) produced high level of biogas, 0.260–0.277 L CH4 gCOD −1 added and 0.235–0.276 L CH4 gCOD −1 added , respectively. HTC process waters from digestate of microalgal biomass, characterized by a methane yield of 0.20–0.27 L CH4 gVS −1 , have been recycled to the primary AD of microalgae, improving methane yield by 40% [ 93 ]. Oliveira et al [ 26 ] reached a methane production of 0.010–0.021 L CH4 gFM −1 added (fresh matter) from HTC process waters of separated digested sludge and agro-industrial waste.…”

Section: Hydrothermal Carbonization Process Waters Valorizationmentioning

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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Section: Hydrothermal Carbonization Of Digestatementioning

confidence: 99%

Section: Hydrothermal Carbonization Process Waters Valorizationmentioning

confidence: 99%

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

Langone

Basso

2020

IJERPH

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“…Perkembangan teknologi dalam bidang material telah mengalami perkembangan yang sangat pesat dalam beberapa tahun terakhir (5). Banyak metode yang digunakan untuk pembuatan material ini, salah satunya menggunakan metode hydrothermal (6)(7)(8). Hydrothermal terbentuk dari kata hidro yang berarti air dan thermal yang berarti panas (9)(10)(11).…”

Section: Pendahuluanunclassified

A Review What Is Hydrothermal ?

Putri¹,

Ritonga²,

Murdiati³

et al. 2018

Preprint

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Hydrothermal merupakan suatu teknik pengkristalan dari temperatur tinggi pada keadaan campuran dan tekanan tinggi. Sintesis hydrothermal dapat juga didefinisikan metode yang menggunakan panas dan air. Pada praktiknya, metode ini melibatkan pemanasan reaktan dalam wadah tertutup (autoclave) menggunakan air. Dalam wadah tertutup, tekanan meningkat dan air tetap sebagai cairan. Ada beberapa metode hydrothermal yaitu reaksi hydrothermal,hidrolisis hydrothermal, metode elektrocemical hydrothermal, reactive elektrode submerged Arc, proses mechanocemical hydrothermal, proses hydrotermal microwave, metode sonochemical hydrothermal . Tujuan mereview ini untuk mengetahui kekurangan dan kelebihan dari metode hidrotermal pada pembentukan material

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“…Thus, the anaerobic digestate contains mostly hardly biodegradable organic matter and is an ideal feedstock for HT (i.e., inter‐stage HT) to increase the extent of sludge conversion to methane (Aragón‐Briceño et al, 2017; Liu et al, 2021). However, only a limited number of studies evaluated the efficacy of inter‐stage HT (i.e., AD‐HT‐AD) in increasing methane production from municipal sludge (Nuchdang et al, 2018; Ortega‐Martinez et al, 2016; Yang et al 2019; Yuan et al, 2019).…”

Section: Introductionmentioning

confidence: 99%

Comparative assessment of pre‐ and inter‐stage hydrothermal treatment of municipal sludge for increased methane production

Zhang

Liu

Wang

et al. 2021

Water Environment Research

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Hydrothermal treatment (HT) is a promising technology to enhance anaerobic digestion (AD) of municipal sludge. However, the capacity of pre-and inter-stage HT (i.e., HT-AD and AD-HT-AD, respectively) to enhance the digestibility of municipal sludge has not been sufficiently explored. This study compared the efficacy of pre-and inter-stage HT performed from 90 to 185°C to enhance methane production from a mixture of primary sludge and waste activated sludge using mesophilic (35°C) biochemical methane potential tests. In both configurations, sludge solubilization increased with HT temperature. HT-AD, and to a greater extent AD-HT-AD, increased the release of ammonium nitrogen. Even though HT at 185°C dramatically increased sludge solubilization, the overall specific methane yield with HT at 185°C was lower than or comparable to that at lower HT temperatures in the HT-AD and AD-HT-AD configurations, respectively. Up to 155°C HT, the overall specific methane yield with the HT-AD configuration was higher by 4.9%-8.3% compared to the AD-HT-AD configuration. However, when the HT energy was considered, compared to the control (i.e., AD of sludge without HT), the net energy gain (ΔE) decreased as the HT temperature increased, becoming negative at an HT of 185°C. The AD-HT-AD configuration resulted in a higher overall volatile solids destruction (by 8.1 to 20.1%). In conclusion, for municipal sludge with a relatively high ultimate digestibility, as was the case in this study, HT-AD is preferable as it has a smaller footprint and is easier to operate than the AD-HT-AD configuration. However, given the significantly higher volatile solids destruction in the AD-HT-AD configuration, compared to the HT-AD configuration, AD-HT-AD may be more beneficial considering post-AD sludge handling processes. © 2021 Water Environment Federation • Practitioner points• Hydrothermal treatment (HT) increased the rate and extent of methane production from municipal sludge mixture. • 155°C was the optimal temperature for either pre-or inter-stage HT to increase biogas production. • Pre-and inter-stage HT resulted in comparable ultimate methane production.• Pre-stage HT is preferable to inter-stage HT (smaller footprint, easier to operate).• AD-HT-AD resulted in significantly higher volatile solids destruction compared to the HT-AD configuration.

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Hydrothermal post-treatment of digestate to maximize the methane yield from the anaerobic digestion of microalgae

Cited by 36 publications

References 22 publications

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

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

A Review What Is Hydrothermal ?

Comparative assessment of pre‐ and inter‐stage hydrothermal treatment of municipal sludge for increased methane production

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