Liquefaction of sewage sludge in ethanol-water mixed solvents for bio-oil and biochar products

Lai, Fa-ying; Chang, Yan-chao; Huang, Huajun; Wu, Guoqiang; Xiong, Jianyin; Pan, Zhizhong; Zhou, Cong

doi:10.1016/j.energy.2018.01.186

Cited by 70 publications

(19 citation statements)

References 56 publications

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“…Beneficial synergistic effects of ethanol-water co-solvents on biocrude yield and energy recovery have been reported (Lai et al, 2018). Li et al (2010) also found that increasing ethanol-water ratios could improve the yield and reduce the O contents of biocrude.…”

Section: ========================== Please Insert Tablementioning

confidence: 94%

“…For acetone, ethanol, methanol, and n-hexane, their critical temperatures are 234.9, 243.1, 239.5, and 234.5 °C, respectively, while their critical pressures are 4.8, 6.3, 8.1, and 3.0 MPa, respectively. Secondly, organic solvents could dissolve liquefied products with highmolecular-weight more easily than using pure water due to the lower dielectric constants (Lai et al, 2018).…”

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confidence: 99%

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Hydrochar derived from municipal sludge through hydrothermal processing: A critical review on its formation, characterization, and valorization

et al. 2021

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confidence: 94%

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confidence: 99%

Hydrochar derived from municipal sludge through hydrothermal processing: A critical review on its formation, characterization, and valorization

et al. 2021

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“…This may be because MB has volatile components up to 81.1% volatile components and its structure is loose. When the temperature is relatively low, organic solids in MB did not fully decompose and generate abundant biomass oil [48]. When the temperature was relatively high, the high temperature destroyed the pore structure of the biochar, which caused the TMBC pore structure to collapse, and the adsorption sites on the biochar surface decreased [49].…”

Section: Effects Of Pyrolysis Temperature Dosage and Initial Ph On mentioning

confidence: 99%

Removal of Aquatic Cadmium Ions Using Thiourea Modified Poplar Biochar

Zhu

Liang

et al. 2020

Water

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Removal of aquatic cadmium ions using biochar is a low-cost method, but the results are usually not satisfactory. Modified biochar, which can be a low-cost and efficient material, is urgently required for Cd-polluted water and soil remediation. Herein, poplar bark (SB) and poplar sawdust (MB) were used as raw materials to prepare modified biochar, which is rich in N- and S- containing groups, i.e., TSBC-600 and TMBC-600, using a co-pyrolysis method with thiourea. The adsorption characteristics of Cd2+ in simulated wastewater were explored. The results indicated that the modification optimized the surface structure of biochar, Cd2+ adsorption process by both TSBC-600 and TMBC-600 was mainly influenced by the initial pH, biochar dosage, and contact time, sthe TSBC-600 showed a higher adsorption capacity compared to TMBC-600 under different conditions. The Langmuir adsorption isotherm model and pseudo-second-order kinetic model were more consistent with the adsorption behavior of TSBC-600 and TMBC-600 to Cd2+, the maximum adsorption capacity of TSBC-600 and TMBC-600 calculated by the Langmuir adsorption isotherm model was 19.998 mg/g and 9.631 mg/g, respectively. The modification method for introducing N and S into biochar by the co-pyrolysis of biomass and thiourea enhanced the removal rate of aquatic cadmium ions by biochar.

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“…In addition, through Boehm functional group titration, it can be seen that biochar contains a large number of oxygen-containing functional groups, such as carboxyl groups, phenols and other acidic groups, and some basic groups, which have a strong negative charge and can produce electrostatic gravitation with positively charged chromogenic groups after ionization of MB, RB and CV. The positively charged chromogenic group produces electrostatic attraction (Lai et al 2018). Meanwhile, the absorption peaks at 1,438 cm À1 and 869 cm À1 also decreased, which indicated that the carbonate minerals in biochar participated in the dye adsorption process.…”

Section: Adsorption Mechanismsmentioning

confidence: 93%

Activated biochar derived from spentAuricularia auriculasubstrate for the efficient adsorption of cationic azo dyes from single and binary adsorptive systems

Zhang

et al. 2021

Water Science and Technology

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In this study, spent Auricularia auricula substrate (AS)-derived biochar (ASBCs) and activated biochar with NaOH (A-ASBC) were evaluated for the adsorption of cationic azo dyes, including methylene blue (MB), rhodamine B (RB), and crystal violet (CV), from single and binary adsorptive systems. A-ASBC showed a higher maximum adsorption capacity for these dyes (MB: 53.62 mg·g−1, RB: 32.33 mg·g−1, CV: 735.73 mg·g−1) than ASBCs in a single system because it had a greater specific surface area and more oxygen containing-functional groups on the surface. The adsorption process of the three dyes onto the adsorbents was in good agreement with the Freundlich adsorption isotherm and fit the pseudo-second-order kinetic model, which revealed sorbate polymolecular layer formation over the adsorbent surface and the involvement of chemisorption. The adsorption mechanism showed that the adsorption of three dyes on adsorbents could be postulated as a multistep process with extraordinary affinity-induced adsorption in terms of both physisorption and chemisorption. In the binary adsorptive system, the results showed that all MB, RB, and CV had antagonistic/competitive effects on each other's adsorption (QBinary/QSingle < 1). Furthermore, a phytotoxic assay affirmed the effectiveness of the adsorbent in adsorbing dye species from aqueous solutions using Brassica pekinensis L. seeds as the model. Therefore, activated biochar prepared from AS can be used as a potentially economical and effective adsorbent for treating printing and dyeing wastewater.

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Liquefaction of sewage sludge in ethanol-water mixed solvents for bio-oil and biochar products

Cited by 70 publications

References 56 publications

Hydrochar derived from municipal sludge through hydrothermal processing: A critical review on its formation, characterization, and valorization

Hydrochar derived from municipal sludge through hydrothermal processing: A critical review on its formation, characterization, and valorization

Removal of Aquatic Cadmium Ions Using Thiourea Modified Poplar Biochar

Activated biochar derived from spentAuricularia auriculasubstrate for the efficient adsorption of cationic azo dyes from single and binary adsorptive systems

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