Annotation

Purpose: to study the main indicators of sewage sludge in the town Volzhsky and the possibility of its practical application on farmlands. 

Materials and methods. The object of research is sewage sludge from waste treatment plants of the town Volzhsky, Volgograd region. The chemical composition of sewage sludge was studied under laboratory conditions. Field experiments were laid in accordance with generally accepted methods. 

Results and discussions. Experimental studies have determined that high concentration of nitrogen (3.3 %), phosphorus (4.27 %), potassium (0.31 %) was noted in the sewage sludge, the organic matter content was 32.0 %. The water extract analysis data indicate a high concentration of calcium cations (33.25 mmol/100 g of soil) and magnesium (14.25 mmol/100 g of soil), as well as sulfate anions (5.80 mmol/100 g of soil). Heavy metals are present in the sludge, but their amount is much lower than the maximum permissible concentration. When testing sewage sludge in the field, it was found that, a decrease in soil bulk density to 1.10 t/m cub. is achieved in combination with chisel tillage. (dose of sewage sludge is 5 t/ha) and up to 1.07 t/m cub. (dose of sewage sludge is 10 t/ha). The data analysis on the safflower yield shows that the processed sewage sludge application increases the yield of safflower seeds in all years of research. The variant of combined action of sludge at a dose of 10 t/ha and chisel tillage turned out to be preferable, which made it possible to increase the safflower yield to 1.51 t/ha on average over the years of research. Conclusions: under the arid conditions of Volgograd region, it is advisable to use deep chisel tillage in combination with sewage sludge at a dose of 10 t/ha in order to increase the productivity of safflower and reduce the bulk density. 

doi: 10.31774/2712-9357-2022-12-2-53-67

For quoting

Mezhevova A. S. Practical application of domestic sewage sludge waters on the example of safflower cultivation. Land Reclamation and Hydraulic Engineering. 2022;12(2):53–67. (In Russ.). https://doi.org/10.31774/2712-9357-2022-12-2-53-67.

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