Characterization of dairy manure hydrochar and aqueous phase products generated by hydrothermal carbonization at different temperatures

Wu, Ke; Gao, Ying; Zhu, Guangkuo; Zhu, Jinjiao; Yuan, Qiaoxia; Chen, Yingquan; Cai, Mengxin; Feng, Lijuan

doi:10.1016/j.jaap.2017.07.017

Cited by 96 publications

(30 citation statements)

References 33 publications

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“…That initial feedstock is generally characterized by low amounts in fixed carbon and an important content in volatile matter (Table 1) [30]. After HTC, specific changes in the morphological and chemical properties could be noticed (Fig.…”

Section: Livestock Wastesmentioning

confidence: 94%

Hydrochars production, characterization and application for wastewater treatment: A review

Azzaz

Khiari

Jellali

et al. 2020

Renewable and Sustainable Energy Reviews

149

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Hydrothermal carbonization (HTC) of wet solid wastes has been pointed out as an eco-friendly, flexible and highly efficient technology for the sustainable valorization of multiple sourced wastes. In this review paper, most recent studies on hydrochars (solid residue of the HTC process) production, characterization and application for wastewaters treatment was summarized and deeply discussed. The role of initial feedstock source nature and characteristics as well as the HTC experimental conditions including the temperature, the residence time and the pH media was assessed. Physical and chemical activation methods including the use of oxygen, steam, microwave, acids, alkaline, organics and salty solutions for the improvement of the physicochemical properties of the produced hydrochars are compared. The efficiency of these raw/modified hydrochars along with the involved mechanisms during organic (dyes) and mineral pollutants (heavy metals and nutrients) removal from aqueous solutions is also reviewed. Finally, this paper addresses the main challenges and also demonstrates insights on new directions for hydrochars research and development in the future.

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Section: Livestock Wastesmentioning

confidence: 94%

Hydrochars production, characterization and application for wastewater treatment: A review

Azzaz

Khiari

Jellali

et al. 2020

Renewable and Sustainable Energy Reviews

149

View full text Add to dashboard Cite

show abstract

“…The peaks between 3,200 and 3,400 cm -1 are probably derived from the (-OH) band in hydroxyl and carboxyl groups, indicating the existence of free and intermolecular bonded groups. The relative increase in the spectrum intensity at 3250 cm -1 is due to the intense dehydration at high HTC temperatures (Wu et al, 2017).…”

Section: Ftir Analysismentioning

confidence: 96%

“…Table 1 lists the data showing the effect of HTC processing temperature and residence time on the hydrochar yield. The hydrochar yield decreased significantly with increasing temperature because of the intense decomposition of the large molecules into smaller components (aqueous phase) and incondensable low molecular gaseous products (Wu et al, 2017). Hence, a higher fraction of the aqueous phase is expected to form at higher HTC temperatures, resulting in higher solubility and elemental extraction (Jin et al, 2019).…”

Section: The Effect Of Htc Conditions (Severity Factor) On Hydrochar Yieldmentioning

confidence: 99%

Coupling hydrothermal carbonization with anaerobic digestion: an evaluation based on energy recovery and hydrochar utilization

2021

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This work evaluates the effect of hydrothermal carbonization (HTC) as a pretreatment and post-treatment technique to anaerobic digestion (AD) of dairy sludge. HTC's effect on AD was evaluated based on energy recovery, nutrient transformation, and hydrochar utilization. The first approach was executed by performing HTC under a range of temperatures before mesophilic AD. HTC optimal pretreatment temperature was 210 °C for 30 min residence time. HTC pretreatment significantly increased the methane yield potential by 192%, the chemical oxygen demand removal by 18%, and the sludge biodegradability during AD by 30%. On the other hand, the application of HTC after AD (post-treatment) increased the total energy production, i.e., in addition to methane, a hydrochar with a caloric value of 10.2 MJ/kg was also obtained. Moreover, HTC post-treatment improved the steam gasification performance of the AD digestate. From the fertilizer quality point of view, HTC implementation generally boosted the concentrations of macro, micro, and secondary nutrients, suggesting its suitability for use as a liquid fertilizer. Overall, the findings of the present study indicate that if bioenergy production were the main target, HTC post-treatment following AD would lead to the most promising outcomes.

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“…Additionally, updated reactors or technologies were adopted to quickly and efficiently produce bio-oil (Cai et al 2018a;Cai and Liu 2016;Cai et al 2018b;Tan et al 2017). The characterization of bio-oil had also been widely conducted (Anupam et al 2016;Gao et al 2017;Mandal et al 2018;Morali et al 2016;Tan et al 2017;Wu et al 2017a). Ghidotti et al (2017) used a novel technology of ultrahigh resolution mass spectrometry Fourier transform ion cyclotron resonance mass spectrometry (FT-ICR-MS) to detect the chemical composition of bio-oil, which highlighted the understanding of bio-oil produced during thermal treatments.…”

Section: Biochar Productionmentioning

confidence: 99%

A scientometric review of biochar research in the past 20 years (1998–2018)

Ata-Ul-Karim

Singh

et al. 2019

Biochar

182

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Biochar is the carbon-rich product obtained from the thermochemical conversion of biomass under oxygen-limited conditions. Biochar has attained extensive attention due to its agronomical and environmental benefits in agro-ecosystems. This work adopts the scientometric analysis method to assess the development trends of biochar research based on the literature data retrieved from the Web of Science over the period of 1998-2018. By analysing the basic characteristics of 6934 publications, we found that the number of publications grew rapidly since 2010. Based on a keyword analysis, it is concluded that scholars have had a fundamental recognition of biochar and preliminarily found that biochar application had agronomic and environmental benefits during the period of 1998-2010. The clustering results of keywords in documents published during 2011-2015 showed that the main research hotspots were "biochar production", "biochar and global climate change", "soil quality and plant growth", "organic pollutants removal", and "heavy metals immobilization". While in 2016-2018, beside these five main research hotspots, "biochar and composting" topic had also received greater attention, indicating that biochar utilization in organic solid waste composting is the current research hotspot. Moreover, updated reactors (e.g., microwave reactor, fixed-bed reactor, screw-feeding reactor, bubbling fluidized bed reactor, etc.) or technologies (e.g., solar pyrolysis, Thermo-Catalytic Reforming process, liquefaction technology, etc.) applied for efficient energy production and modified biochar for environmental remediation have been extensively studied recently. The findings may help the new researchers to seize the research frontier in the biochar field.

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Characterization of dairy manure hydrochar and aqueous phase products generated by hydrothermal carbonization at different temperatures

Cited by 96 publications

References 33 publications

Hydrochars production, characterization and application for wastewater treatment: A review

Hydrochars production, characterization and application for wastewater treatment: A review

Coupling hydrothermal carbonization with anaerobic digestion: an evaluation based on energy recovery and hydrochar utilization

A scientometric review of biochar research in the past 20 years (1998–2018)

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