A kinetic study of microalgae, municipal sludge and cedar wood co-pyrolysis

Chakraborty, Sunandan; Dunford, Nurhan Turgut; Goad, Carla L.

doi:10.1016/j.renene.2020.11.012

Cited by 21 publications

(15 citation statements)

References 61 publications

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“…Therefore, with the increasing addition of RH or HS to SS, the experimental pyrolysis temperature range presented a gradual drop from 144.5 to 95.2 °C for the blend of SS/RH and from 144.5 to 88.8 °C for the blend of SS/HS. This shortened pyrolysis temperature range was related to the rising initial and the falling final pyrolysis temperature for the related blends, which could be attributed to the increasing portion of volatile matter in the blends, and this result was consistent with previous studies. , …”

Section: Resultssupporting

confidence: 92%

“…This shortened pyrolysis temperature range was related to the rising initial and the falling final pyrolysis temperature for the related blends, which could be attributed to the increasing portion of volatile matter in the blends, and this result was consistent with previous studies. 20,21 Furthermore, in the blending of either SS/RH or SS/HS, the experimental pyrolysis temperature ranges show a similar trend to their corresponding calculated results, but the former was lower by 6.7−20.4 °C than the latter at the same blending ratio and blending precursors. These results were due to the synergistic effect during co-pyrolysis of the blending of SS/RH or SS/HS.…”

Section: Physical Characteristics Of Blendssupporting

confidence: 66%

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Synergistic Effects on the Co-pyrolysis of Agricultural Wastes and Sewage Sludge at Various Ratios

Chen

Jian

2021

ACS Omega

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This study investigated the co-pyrolysis of blends of sewage sludge (SS) with rice husk (RH) and with hemp straw (HS) at different ratios by using thermogravimetry (TG) and its rate (DTG, derivative TG) analysis at heating rates of 10, 20, and 30 K/min. The resulting kinetic parameters of activation energy (E a ) were calculated by both Flynn−Wall−Ozawa and Kissinger−Akahira−Sunose models, followed by comparison of experimental values with calculated values to reveal the synergistic effects of SS/RH and SS/HS. With increasing additions of RH or HS to SS, a gradual decreasing trend in the experimental pyrolysis temperature range was evident, ranging from 144.5 to 95.2 °C for SS/RH and from 144.5 to 88.8 °C for SS/RH. Moreover, such temperature ranges were 6.7−20.4 °C less than the calculated values at the same blending ratio. The fitting results of the two kinetic models showed that with the same SS mass ratio, the experimental E a * (average activation energy) of both SS/RH and SS/HS were less than the calculated E a *. Especially, the experimental E a * of 7SS−3RH was lower around 43.8% than the calculated E a *, whereas the experimental E a * of 3SS−7HS was lower by about 39.4% than the calculated E a *. Synergistic analysis demonstrated that the co-pyrolysis of RH or HS with SS at various mass ratios presented obvious synergistic effects and then the decrease of E a . The mechanism experiment showed that the co-pyrolysis of SS/HS may promote the decrease of E a by changing the co-pyrolysis gas products or by increasing the overflow of volatile matter and then forming intermediate transition products, while SS/RH may accelerate the decrease of the E a by using an appropriate K addition ratio from RH as a metal catalyst.

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Section: Resultssupporting

confidence: 92%

Section: Physical Characteristics Of Blendssupporting

confidence: 66%

Synergistic Effects on the Co-pyrolysis of Agricultural Wastes and Sewage Sludge at Various Ratios

Chen

Jian

2021

ACS Omega

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“…The first two materials' contributions mainly involved lignin, cellulose, and hemicellulose (Castillo-Toro et al 2021 ). These polymers have complex chemical structures, with stable chemical bonds (ether, carbon–carbon, β-glucosides, among others), high aromaticity (lignin), a high C:N ratios and low moisture percentages (9.04 ± 0.29 and 7.43 ± 0.57%, for RM 1 /LCM and RM 3 /PB, respectively) (Castillo-Toro et al 2021 ; Chakraborty et al 2021 ), (Table 2 ). In addition, the lignocellulose meshes (RM 1 /LCM) had dead fungal and bacterial biogenic biomass, which remained attached to the meshes after being used in wastewater treatment.…”

Section: Discussionmentioning

confidence: 99%

“…One of the most commonly used agro-industrial wastes for the co-pyrolysis process with sludge is lignocellulosic biomasses (tree bark, leaves, sawdust and shavings) generated in forestry companies (Moreno-Bayona et al 2019 ; Castillo-Toro et al 2021 ; Céspedes-Bernal et al 2021 ). These wastes provide lignin, a resistant aromatic polymer with high carbon/nitrogen ratios and low biodegradability (Yoo et al 2020 ; He et al 2021 ), that once thermally transformed, allows biochar with higher slow-release carbon content to be obtained compared to biochar obtained using only biogenic biomass from secondary or tertiary sludge (Chen et al 2017 ; Chakraborty et al 2021 ).…”

Section: Introductionmentioning

confidence: 99%

Use of biochar and a post-coagulation effluent as an adsorbent of malachite green, beneficial bacteria carrier, and seedling substrate for plants belonging to the poaceae family

Plaza-Rojas,

Amaya-Orozco,

Rivera-Hoyos

et al. 2023

3 Biotech

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Wastewater treatment plants produce solid and semi-solid sludge, which treatment minimises secondary environmental pollution because of wastewater treatment and obtaining new bioproducts. For this reason, in this paper, the co-pyrolysis of biogenic biomasses recovered from a biological reactor with immobilised fungal and bacterial biomass and a tertiary reactor with Chlorella sp. used for dye-contaminated wastewater treatment was carried out. Biogenic biomasses mixed with pine bark allowed the production and characterisation of two types of biochar. The raw material and biochar were on the “in vitro” germination of Lolium sp. seeds, followed by adsorption studies for malachite green (MG) dye using the raw material and the biochar. Results showed that using 60 mg L−1 of a cationic coagulant at pH 6.5 allowed for the recovery of more than 90% of the microalgae after 50 min of processing. Two biochar resulted: BC300, at pH 5.08 ± 0.08 and BC500, at pH 6.78 ± 0.01. The raw material and both biochars were co-inoculated with growth-promoting bacteria; their viabilities ranged from 1.7 × 106 ± 1.0 × 101 to 7.5 × 108 ± 6.0 × 102 CFU g−1 for total heterotrophic, nitrogen-fixing and phosphate-solubilising bacteria. Re-use tests on Lolium sp. seed germination showed that with the post-coagulation effluent, the germination was 100%, while with the biochar, with and without beneficial bacteria, the germination was 98 and 99%, respectively. Finally, BC500 adsorbed the highest percentage of malachite green at pH 4.0, obtaining qecal values of 0.5249 mg g−1 (R2: 0.9875) with the pseudo-second-order model.

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“…Moreover, the higher yield rate co-pyrolysis technique is highly influenced by individual components of biomass (Volpe et al, 2018). Sourabh Chakraborty et al (Chakraborty et al, 2021) examined the co-pyrolysis process using digested sludge, algal biomass and cedarwood for the production of bio-oil through thermochemical techniques. Even though the co-pyrolysis technique has reduced the oxygen content in the resultant products, the bio-oil extracted rate is slightly higher than other conventional pyrolysis (Zhao et al, 2020).…”

Section: Introductionmentioning

confidence: 99%

Catalytic microwave preheated co-pyrolysis of lignocellulosic biomasses: A study on biofuel production and its characterization

Jacqueline

Muthuraman

Karthick

et al. 2022

Bioresource Technology

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A kinetic study of microalgae, municipal sludge and cedar wood co-pyrolysis

Cited by 21 publications

References 61 publications

Synergistic Effects on the Co-pyrolysis of Agricultural Wastes and Sewage Sludge at Various Ratios

Synergistic Effects on the Co-pyrolysis of Agricultural Wastes and Sewage Sludge at Various Ratios

Use of biochar and a post-coagulation effluent as an adsorbent of malachite green, beneficial bacteria carrier, and seedling substrate for plants belonging to the poaceae family

Catalytic microwave preheated co-pyrolysis of lignocellulosic biomasses: A study on biofuel production and its characterization

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