Microwave assisted low-temperature hydrothermal treatment of solid anaerobic digestate for optimising hydrochar and energy recovery

doi:10.1016/j.cej.2020.124999

	Microwave assisted low-temperature hydrothermal treatment of solid anaerobic digestate for optimising hydrochar and energy recovery
	Deng, Chen 1,2; Kang, Xihui 1,2,3,4; Lin, Richen 1,2; Murphy, Jerry D.1,2
刊名	CHEMICAL ENGINEERING JOURNAL
	2020-09-01
卷号	395 页码:13
关键词	Microwave assisted hydrothermal treatment Hydrochar Anaerobic digestion Digestate post-treatment
ISSN号	1385-8947
DOI	10.1016/j.cej.2020.124999
通讯作者	Lin, Richen(richen.lin@ucc.ie)
英文摘要	With 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.
资助项目	Science 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关键词	RESOLUTION MASS-SPECTROMETRY ; PHYSICOCHEMICAL PROPERTIES ; CARBON MATERIALS ; ORGANIC-MATTER ; PRODUCT YIELDS ; SEWAGE-SLUDGE ; BIOGAS PLANTS ; CARBONIZATION ; PRETREATMENT ; BIOCHAR
WOS研究方向	Engineering
语种	英语
出版者	ELSEVIER SCIENCE SA
WOS记录号	WOS:000537396600008
资助机构	Science 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
内容类型	期刊论文
源URL	[http://ir.giec.ac.cn/handle/344007/27208]
专题	中国科学院广州能源研究所
通讯作者	Lin, Richen
作者单位	1.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
推荐引用方式 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.