Journal
ENERGY
Volume 206, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.energy.2020.118189
Keywords
Giant miscanthus; Sewage sludge; Mineral fertilizers; Biomass; Energy balance
Categories
Funding
- University of Warmia and Mazury in Olsztyn [20.610.020-110]
- Minister of Science and Higher Education [010/RID/2018/19]
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The application of sewage sludge as fertilizer in the production of non-food crops is an environmentally sustainable approach to sewage sludge management. This article presents the results of a multidirectional analysis (agronomic and energy efficiency analysis) evaluating the effects of sewage sludge applied at rates equivalent to 100 and 160 kg N ha(-1) on the production of giant miscanthus (Miscanthus x giganteus Greef and Deuter) in north-eastern Poland in 2013-2018. The optimal fertilizer rate was 160 kg N ha(-1) regardless of nitrogen source (mineral fertilizers, sewage sludge), and it contributed to the achievement of the highest biomass yield (19.8 Mg ha(-1) dry matter-DM) and the highest energy output (272-275 GJ ha(-1)). Energy demand was highest (19-24 GJ ha(-1)) in production technologies involving mineral fertilizers. The replacement of mineral fertilizers with sewage sludge decreased energy inputs in the production of giant miscanthus biomass by 32-34%. Energy gain was highest (259 GJ ha(-1)) when M. giganteus was supplied with sewage sludge at a rate equivalent to 160 kg N ha(-1). The energy efficiency ratio peaked (24.7) in the production technology without fertilization. Energy efficiency was 43-52% higher when giant miscanthus plants were supplied with sewage sludge rather than mineral fertilizers. (C) 2020 Elsevier Ltd. All rights reserved.
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