Research Papers: Energy From Biomass

Enhanced Biogas Production in the Duckweed Anaerobic Digestion Process

[+] Author and Article Information
Hongyan Ren

School of Environment and Civil Engineering,
Jiangnan University,
Wuxi 214122, China;
Jiangsu Key Laboratory of
Anaerobic Biotechnology,
Jiangnan University,
Wuxi 214122, China
e-mail: renhongyan@jiangnan.edu.cn

Nan Jiang

School of Environment and Civil Engineering,
Jiangnan University,
Wuxi 214122, China
e-mail: jiangnan715721@126.com

Tao Wang

School of Environment and Civil Engineering,
Jiangnan University,
Wuxi 214122, China
e-mail: 7121401007@vip.jiangnan.edu.cn

M. Mubashar Omar

Department of Farm Machinery and Power,
Faculty of Agricultural
Engineering and Technology,
University of Agriculture,
Faisalabad 38000, Pakistan
e-mail: mubi_mahmood@yahoo.com

Wenquan Ruan

School of Environment and Civil Engineering,
Jiangnan University,
Wuxi 214122, China
e-mail: wqruan@jiangnan.edu.cn

Abdul Ghafoor

Department of Farm Machinery and Power,
Faculty of Agricultural
Engineering and Technology,
University of Agriculture,
Faisalabad 38000, Pakistan
e-mail: abdul.ghafoor@uaf.edu.pk

1Corresponding author.

Contributed by the Advanced Energy Systems Division of ASME for publication in the JOURNAL OF ENERGY RESOURCES TECHNOLOGY. Manuscript received May 31, 2017; final manuscript received March 24, 2018; published online April 16, 2018. Assoc. Editor: Yaning Zhang.

J. Energy Resour. Technol 140(4), 041805 (Apr 16, 2018) (9 pages) Paper No: JERT-17-1255; doi: 10.1115/1.4039782 History: Received May 31, 2017; Revised March 24, 2018

In order to enhance biogas production in the anaerobic digestion of duckweed, and duckweed with excess sludge as single and mixed substrates, the effects of hot alkali pretreatment and variation of the ratio of substrate to inoculum were investigated. The results showed that the delayed stage of anaerobic gas generation could be shortened when the two substrates were mixed during methane production, to give a cumulative gas yield of 2963 mL, which was 11% higher than the calculated value for the complementary substrate. The methane content was 57%, which was 13% higher than that from the duckweed group and 9% higher than from the excess sludge group. Furthermore, the methane yield was improved by 8% after the duckweed was pretreated with hot alkali. When the substrate to inoculum ratio was 1:1, the maximum biogas production of 3309 mL was achieved, with a methane yield of 1883 mL which, respectively, increases of 151 mL and 304 mL compared with the worst group (1:2.5).

Copyright © 2018 by ASME
Topics: Biogas , Methane , Proteins
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Grahic Jump Location
Fig. 1

Schematic of anaerobic digestion apparatus to produce biogas

Grahic Jump Location
Fig. 2

Variation of daily gas yield for three different substrates during anaerobic digestion process

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Fig. 3

Effect of different substrates on total biogas and methane yield and compositions of CH4 and CO2

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Fig. 4

Changes of VFAs concentration and pH on anaerobic digestion of three substrates

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Fig. 5

Changes of NH4+–N (a) and sCOD concentration and (b) during anaerobic digestion of three substrates

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Fig. 6

Changes of dehydrogenase (a) and amylase activity and (b) during anaerobic digestion of three substrates

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Fig. 7

Changes of protein (a) and carbohydrates concentration and (b) during anaerobic digestion of three substrates

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Fig. 8

Variation of daily gas yield (a) and gas composition (b) during anaerobic digestion using pretreatment and untreated group

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Fig. 9

Variation of daily gas yield (a) and gas composition (b) during anaerobic digestion of different substrates and inoculum ratios




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