Hydrothermal carbonization of different wetland biomass wastes: Phosphorus reclamation and hydrochar production

Cui, Xiaoqiang; Lü, Min; Khan, Muhammad Bilal; Lai, Chun-Yu; Yang, Xiaoe; He, Zhenli; Chen, Guanyi; Yan, Beibei

doi:10.1016/j.wasman.2019.10.034

Cited by 64 publications

(43 citation statements)

References 40 publications

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“…A similar trend has been reported in the HTC treatment of swine manure (Heilmann et al, 2014), wetland plants (Cui et al, 2020), and sewage sludge (Huang and Tang, 2016). The cracking of biopolymers and P precipitation during HTC might be responsible for the higher P accumulation in higher temperature-derived hydrochars (Dai et al, 2015;Ekpo et al, 2016).…”

Section: Recovery Of P From Wastewater and Conversion To Microalgae-d...supporting

confidence: 73%

“…Pyrolysis is the thermal treatment of biomass in absence of air at temperatures of 400-600°C, converting dry biomass into pyrochar (Foong et al, 2020). Hydrothermal carbonization (HTC) converts wet biomass to hydrochars at lower temperature (180-260 °C) (Hao et al, 2018;Cui et al, 2020). The higher hydrothermal temperature than 260°C might lead to the increased generation of noxious compounds in hydrochars, including phenols and organic acids (Hao et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

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Hydrothermal carbonization of microalgae for phosphorus recycling from wastewater to crop-soil systems as slow-release fertilizers

Chu

Lyu

Xue

et al. 2021

Journal of Cleaner Production

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Section: Recovery Of P From Wastewater and Conversion To Microalgae-d...supporting

confidence: 73%

Section: Introductionmentioning

confidence: 99%

Hydrothermal carbonization of microalgae for phosphorus recycling from wastewater to crop-soil systems as slow-release fertilizers

Chu

Lyu

Xue

et al. 2021

Journal of Cleaner Production

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“…This transformation could be attributed to a decomposition reaction of calcium carbonate in the presence of acids in the liquid phase, leading to the precipitation of calcium oxalate and calcium phosphate and the liberation of H2O molecules. Although the mineral quantification (Section 3.2.4) suggests the decrease in phosphorus and potassium (Table 1, Table S2), it is possible that the increase in carbonization temperature contributed to the fixation of P and K in a more stable form, especially in the presence of calcium and chloride ions (Cui et al, 2020).…”

Section: Morphological and Structural Properties Of Hydrocharsmentioning

confidence: 99%

Olive mill wastewater: From a pollutant to green fuels, agricultural and water source and bio-fertilizer – Hydrothermal carbonization

Azzaz

Jeguirim

Kinigopoulou³

et al. 2020

Science of The Total Environment

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Hydrothermal carbonization (HTC) is considered as a promising technique for wastes conversion into carbon rich materials for various energetic, environmental and agricultural applications. In this work, the HTC of olive mill wastewater (OMWW) was investigated at different temperatures (180 -220°C) and both, the solid (i.e., hydrochars) and the final process liquid derived from the thermal conversion process were deeply analyzed. Results showed that the solid yield was affected by the temperature, i.e., decrease from 57% to 25% for temperatures of 180°C and 220°C, respectively. Furthermore, the hydrochars presented an increasing fixed carbon percentage with the increase of the carbonization temperature, suggesting that decarboxylation is the main reaction driving the HTC process. The decrease in the O/C ratio promoted an increase of the high heating value (HHV) by 32% for hydrochar prepared at 220°C. The process liquids were sampled and their organic contents were analyzed using GC-MS technique. Acids, alcohols, phenols and sugar derivatives were detected and their concentrations varied with carbonization temperatures. The assessment of the physico-chemical properties of the generated HTC by-products suggested the possible application of the hydrochars for energetic insights while the liquid fraction could be practical for in agricultural field.

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“…However, in some studies, the biochar produced by hydrothermal carbonization is typically acidic [ 83 ]. For example, the pH value of Miscanthus -derived hydrochar prepared by Gronwald et al [ 84 ] at 200 °C is 3.8, and Cui et al [ 85 ] found that the pH values of Hydrocotyle verticillata -, Myriophyllum spicatum - and Canna indica -derived hydrochar (200 °C) are 5.07, 4.97 and 6.48. Liu et al [ 86 ] adjusted the pH value of the initial solution (pH = 2, 3, 5, 7, 9, 11, 12) of the hydrothermal carbonization process, so that the pH value of the prepared sewage-sludge-derived hydrochar was still weakly acidic or neutral (corresponding pH = 5.05, 6.11, 7.24, 6.60, 6.62, 6.74, 6.94).…”

Section: Performance Characteristics Of Biocharmentioning

confidence: 99%

Application Research of Biochar for the Remediation of Soil Heavy Metals Contamination: A Review

Cheng

Chen

Xu³

et al. 2020

Molecules

117

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Soil contamination by heavy metals threatens the quality of agricultural products and human health, so it is necessary to choose certain economic and effective remediation techniques to control the continuous deterioration of land quality. This paper is intended to present an overview on the application of biochar as an addition to the remediation of heavy-metal-contaminated soil, in terms of its preparation technologies and performance characteristics, remediation mechanisms and effects, and impacts on heavy metal bioavailability. Biochar is a carbon-neutral or carbon-negative product produced by the thermochemical transformation of plant- and animal-based biomass. Biochar shows numerous advantages in increasing soil pH value and organic carbon content, improving soil water-holding capacity, reducing the available fraction of heavy metals, increasing agricultural crop yield and inhibiting the uptake and accumulation of heavy metals. Different conditions, such as biomass type, pyrolysis temperature, heating rate and residence time are the pivotal factors governing the performance characteristics of biochar. Affected by the pH value and dissolved organic carbon and ash content of biochar, the interaction mechanisms between biochar and heavy metals mainly includes complexation, reduction, cation exchange, electrostatic attraction and precipitation. Finally, the potential risks of in-situ remediation strategy of biochar are expounded upon, which provides the directions for future research to ensure the safe production and sustainable utilization of biochar.

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Hydrothermal carbonization of different wetland biomass wastes: Phosphorus reclamation and hydrochar production

Cited by 64 publications

References 40 publications

Hydrothermal carbonization of microalgae for phosphorus recycling from wastewater to crop-soil systems as slow-release fertilizers

Hydrothermal carbonization of microalgae for phosphorus recycling from wastewater to crop-soil systems as slow-release fertilizers

Olive mill wastewater: From a pollutant to green fuels, agricultural and water source and bio-fertilizer – Hydrothermal carbonization

Application Research of Biochar for the Remediation of Soil Heavy Metals Contamination: A Review

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