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Microwave assisted low-temperature hydrothermal treatment of solid anaerobic digestate for optimising hydrochar and energy recovery
Deng, Chen1,2; Kang, Xihui1,2,3,4; Lin, Richen1,2; Murphy, Jerry D.1,2
2020-09-01
Source PublicationCHEMICAL ENGINEERING JOURNAL
ISSN1385-8947
Volume395Pages:13
Corresponding AuthorLin, Richen(richen.lin@ucc.ie)
AbstractWith the growth of anaerobic digestion (AD) for biogas production, associated increasing digestate production may cause environmental problems if the increasing agricultural land required for digestate application is limited. An alternative is to valorise the digestate. Microwave assisted low-temperature hydrothermal treatment (MLHT; temperature 100 - 180 degrees C) was investigated as a post-treatment for AD of grass silage under two scenarios: 1) AD + MLHT and 2) Acid pre-treatment + AD + MLHT. Compared to the original grass silage, the digestates investigated required lower temperatures for carbonization in MLHT owing to their lower cellulose content. The higher MLHT temperatures (160 - 180 degrees C) led to significant increases in heating value and greater reductions in atomic ratios of O/C and H/C of hydrochar due to dehydration and decarboxylation reactions. As a result, higher temperatures contributed to higher sugar recovery, higher solid solubilization, and better quality of hydrochar. Under the MLHT at 180 degrees C, the hydrochar produced from digested grass silage in scenario 1 (AD + MLHT) exhibited a mass yield of 0.79 g/g total solid, a carbon content of 63.6% and an ash-free heating value of 27.6 kJ/g volatile solid; the biomethane potential from the process liquor was estimated as 68.7 ml CH4/g total solid. Scenario 1 is preferred over scenario 2 (acid pre-treatment + AD + MLHT) as it gave a higher yield and higher heating value of hydrochar. This study suggests that MLHT is a promising method to 1) produce hydrochar with an energy value comparable to lignite coal, and 2) recover additional biomethane through process liquor recycling.
KeywordMicrowave assisted hydrothermal treatment Hydrochar Anaerobic digestion Digestate post-treatment
DOI10.1016/j.cej.2020.124999
WOS KeywordRESOLUTION MASS-SPECTROMETRY ; PHYSICOCHEMICAL PROPERTIES ; CARBON MATERIALS ; ORGANIC-MATTER ; PRODUCT YIELDS ; SEWAGE-SLUDGE ; BIOGAS PLANTS ; CARBONIZATION ; PRETREATMENT ; BIOCHAR
Indexed BySCI
Language英语
Funding ProjectScience Foundation Ireland (SFI) through the MaREI Centre for Energy, Climate and Marine[12/RC/2302_P2] ; Science Foundation Ireland (SFI) through the MaREI Centre for Energy, Climate and Marine[16/SP/3829] ; European Regional Development Fund under the Interreg NWE Project BIOWILL[NWE 964] ; European Union's Horizon 2020 Research and Innovation Program under the Marie Sklodowska-Curie grant[797259] ; Environmental Protection Agency -Ireland[2018-REMS-13] ; Gas Networks Ireland through the Gas Innovation Group
WOS Research AreaEngineering
Funding OrganizationScience Foundation Ireland (SFI) through the MaREI Centre for Energy, Climate and Marine ; European Regional Development Fund under the Interreg NWE Project BIOWILL ; European Union's Horizon 2020 Research and Innovation Program under the Marie Sklodowska-Curie grant ; Environmental Protection Agency -Ireland ; Gas Networks Ireland through the Gas Innovation Group
WOS SubjectEngineering, Environmental ; Engineering, Chemical
WOS IDWOS:000537396600008
PublisherELSEVIER SCIENCE SA
Citation statistics
Document Type期刊论文
Identifierhttp://ir.giec.ac.cn/handle/344007/27207
Corresponding AuthorLin, Richen
Affiliation1.Univ Coll Cork, Environm Res Inst, MaREI Ctr, Cork, Ireland
2.Univ Coll Cork, Sch Engn, Cork, Ireland
3.Chinese Acad Sci, Guangzhou Inst Energy Convers, Guangzhou, Peoples R China
4.Univ Chinese Acad Sci, Beijing, Peoples R China
Recommended Citation
GB/T 7714
Deng, Chen,Kang, Xihui,Lin, Richen,et al. Microwave assisted low-temperature hydrothermal treatment of solid anaerobic digestate for optimising hydrochar and energy recovery[J]. CHEMICAL ENGINEERING JOURNAL,2020,395:13.
APA Deng, Chen,Kang, Xihui,Lin, Richen,&Murphy, Jerry D..(2020).Microwave assisted low-temperature hydrothermal treatment of solid anaerobic digestate for optimising hydrochar and energy recovery.CHEMICAL ENGINEERING JOURNAL,395,13.
MLA Deng, Chen,et al."Microwave assisted low-temperature hydrothermal treatment of solid anaerobic digestate for optimising hydrochar and energy recovery".CHEMICAL ENGINEERING JOURNAL 395(2020):13.
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