Phytotesting of sewage sludge
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Abstract
The article assesses the possibility of using sewage sludge from the sludge chamber of the Minsk wastewater treatment plant as an unconventional organomineral fertilizer. It is necessary to take into account the degree of contamination of sewage sludge for their further effective use. To assess the level of contamination of silt sediments, we used biological rapid diagnostics-phytotesting. The monocotyledonous plant Hordeum vulgare and the dicotyledonous plant Lepidium sativum were selected as test objects. The main indicators of plant growth and development were determined: germinating capacity, the length of the ground part of the plant and its biomass, the length and development of the root system . Germinating capacity in the experimental samples decreased by an average of 20 % compared to the control sample. Indicators such as the length and development of the plant’s root system and its biomass are suppressed when using sewage sludge as fertilizer. The results obtained may be related to exposure to toxic substances contained in sewage sludge. Sewage sludge contains heavy metals such as Mn (0,58 %), Fe (13,74 %), Cu (1,27 %), Zn (3,22 %), As (0,08 %). However, the results of the elemental analysis of the ash of sewage sludge and the ground part of the test objects grown on the soil with precipitation doses of 4 and 8 t / ha showed that the accumulation of heavy metals in the biomass of the test objects does not occur. At doses of 4 and 8 t/ha of sewage sludge, there is a slight accumulation of zinc and copper in the ground part of the watercress; the accumulation of heavy metals in the biomass of barley is not observed .
About the Authors
E. A. Flyurik
Belarusian State Technological University
Belarus
Belarus
Minsk
A. A. Masekhnovich
Belarusian State Technological University
Belarus
Belarus
Minsk
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Review
For citations:
Flyurik E.A., Masekhnovich A.A. Phytotesting of sewage sludge. Natural resources. 2022;(1):38-43. (In Russ.)
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