Experimental study on anaerobic co-digestion of the individual component of biomass with sewage sludge: methane producti
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ORIGINAL ARTICLE
Experimental study on anaerobic co-digestion of the individual component of biomass with sewage sludge: methane production and microbial community Pengfei Li 1 & Chongbo Cheng 1 & Chao He 2 & Ran Yu 1 & Dekui Shen 1 & Youzhou Jiao 2 Received: 31 May 2020 / Revised: 8 September 2020 / Accepted: 2 October 2020 # Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract The co-digestion of the individual component of biomass with sewage sludge was investigated, concerning the cumulative methane yield, variation of pH, chemical oxygen demand (COD), volatile fatty acids (VFAs), and total ammonia nitrogen (TAN) during 50-day digestion. The microbial community at the initial stage (stage I) and maximum methane production rate stage (stage II) of the digestion process were identified by Illumina MiSeq sequencing. The cumulative methane yield from codigestion of cellulose and sludge was increased by 33.33% over the calculated value from that of mono-digestion of cellulose and sludge, while that from co-digestion of hemicellulose and sludge was achieved as 259.32% compared with the calculated value from that of mono-digestion of hemicellulose and sludge. The Firmicutes to Bacteroidetes (F/B) ratio at the stage II of codigestion of hemicellulose and sludge was notably decreased from 46.53 to that of 1.39 for mono-digestion of hemicellulose. The percentage of Methanosarcina in acetoclastic methanogens at the stage II of mono-digestion of hemicellulose was largely increased from 1.06% to that of 97.03% for co-digestion of hemicellulose and sludge. Keywords Anaerobic co-digestion . Sewage sludge . Cellulose . Hemicellulose . Lignin
1 Introduction With the acceleration of industrialization and urbanization, the disposal of sludge has become a global problem [1]. Meanwhile, the utilization of straw resources in rural areas
Chongbo Cheng contributed equally to this work should be considered as co-first author. Electronic supplementary material The online version of this article (https://doi.org/10.1007/s13399-020-01049-6) contains supplementary material, which is available to authorized users. * Dekui Shen [email protected] * Youzhou Jiao [email protected] 1
Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education, School of Energy and Environment, Southeast University, Nanjing 210096, People’s Republic of China
2
College of Mechanical and Electrical Engineering, Henan Agricultural University, Nongye Road 63, Zhengzhou 450002, Henan, People’s Republic of China
has been a crucial issue for local governments [2]. Sewage sludge with a high content of nitrogen and functional buffering capacity [1] could help the digestion system resist pH change [3]. Agricultural straw with high carbon/nitrogen ratio (C/N) and recalcitrant lignocellulosic structure [4] is always facing severe problems when it is digested alone [5]. Codigestion of straw and sludge can be an effective and economical solution for the correct disposal of the above two solid wastes [6]. The previous researches
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