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The effect of biodigestate and sewage sludge on the switchgrass growth, biomass elemental composition and thermal characteristics

M. Kharytonov,N. Martynova,M. Babenko,S. Lemishko,Alla Samarska,M. Gispert

Published 2025 in International Journal of Environmental Studies

ABSTRACT

ABSTRACT Low-productive lands that are unsuitable for growing agricultural products can be successfully used to create plantations of energy crops. Depending on the dose, productivity increased by 1.7-2.6 times. In the first years, the biomass yield after adding biodigestate (BD) was 10-20% higher than in the experiment with sewage sludge (SS). The effect of sewage sludge application was longer than that of biodigestate. The content of mobile phosphorus in loess-like loam after the introduction of biodigestate in three doses exceeded the corresponding values for sewage sludge by 14-45%. At the same time the content of zinc, cobalt, nickel and lead in loess-like loam after the introduction of sewage sludge in three doses exceeded the corresponding values for biodigestate by 9-11%, and for cadmium and chromium by 31-40%. The content of trace elements, including toxic ones, in switchgrass biomass was small and did not exceed the recommended limits for plants even with the introduction of large doses of sewage sludge and biodigestate. In general, the uptake of trace elements in plots with sewage sludge was higher than in areas with biodigestate. The thermal effect of biodigestate application was more pronounced than that of sewage sludge.

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