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Improving methane production from wheat straw by digestate liquor recirculation in continuous stirred tank processes
Peng, Xiaowei1,3; Nges, Ivo Achu1; Liu, Jing1,2
2016
Source PublicationRENEWABLE ENERGY
ISSN0960-1481
Volume85Issue:JANPages:12-18
AbstractWheat straw is an abundant, cheap substrate that can be used for methane production. However, the nutrient content in straw is inadequate for methane fermentation. In this study, recycling digestate liquor was implemented in single-stage continuous stirred tank processes for enrichment of the nutrient content of straw with the aim of improving the methane production. The VS-based organic loading rate was set at 2 g/(L d) and the solid retention time at 40 days. When wheat straw alone was used as the substrate, the methane yields achieved with digestate liquor recycling was on average 240 ml CH4/g VS giving a 21% improvement over the processes without recycling. However, over time, the processes suffered from declining methane yields and poor stability evidenced by low pH. To maintain process stability, wheat straw was co-digested with sewage sludge or supplemented with macronutrients (nitrogen and phosphorous). As a result, the processes with digestate liquor recycling could be operated stably, achieving methane yields ranging from 288 to 296 ml CH4/g VS. Besides, the processes could not be operated sturdily with supplementation of macronutrients without digestate liquor recycling. The highest methane yield (296 16 ml CH4/g VS) was achieved by co-digestion with sewage sludge plus recycling of digestate liquor after filtration (retention of nutrients and microorganisms). This was comparable to the maximum expected methane yield of 293 13 ml CH4/g VS achieved in batch test. The present study therefore demonstrated that digestate liquor recycling could lead to a decreased dilution of vital nutrients from the reactors thereby rendering high process performance and stability. (C) 2015 Elsevier Ltd. All rights reserved.
KeywordAnaerobic Digestion Digestate Macronutrients Sewage Sludge Wheat Straw
SubtypeArticle
WOS HeadingsScience & Technology ; Technology
DOI10.1016/j.renene.2015.06.023
Indexed BySCI
Language英语
WOS KeywordANAEROBIC-DIGESTION ; BIOGAS PRODUCTION ; SWINE MANURE ; SUGARCANE BAGASSE ; STABLE OPERATION ; BEET SILAGE ; PRETREATMENT ; HYDROLYSATE ; BATCH ; REQUIREMENTS
WOS Research AreaEnergy & Fuels
WOS SubjectEnergy & Fuels
Funding OrganizationSwedish Energy Agency ; Swedish International Development Cooperation Agency (SIDA) ; Chinese Academy of Sciences
WOS IDWOS:000363344800002
Citation statistics
Document Type期刊论文
Identifierhttp://ir.ipe.ac.cn/handle/122111/19737
Collection生化工程国家重点实验室
Affiliation1.Lund Univ, Dept Biotechnol, SE-22100 Lund, Sweden
2.Bioproc Control AB, SE-22363 Lund, Sweden
3.Chinese Acad Sci, Inst Proc Engn, State Key Lab Biochem Engn, Beijing 100190, Peoples R China
Recommended Citation
GB/T 7714
Peng, Xiaowei,Nges, Ivo Achu,Liu, Jing. Improving methane production from wheat straw by digestate liquor recirculation in continuous stirred tank processes[J]. RENEWABLE ENERGY,2016,85(JAN):12-18.
APA Peng, Xiaowei,Nges, Ivo Achu,&Liu, Jing.(2016).Improving methane production from wheat straw by digestate liquor recirculation in continuous stirred tank processes.RENEWABLE ENERGY,85(JAN),12-18.
MLA Peng, Xiaowei,et al."Improving methane production from wheat straw by digestate liquor recirculation in continuous stirred tank processes".RENEWABLE ENERGY 85.JAN(2016):12-18.
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