Wastewater sludge use as a composition of soils for disturbed lands reclamation in the Far North conditions

The paper analyzes the use of sewage sludge from sewage treatment plants in the city of Novy Urengoy as part of the soil for reclamation purposes. Sewage sludge from sewerage treatment plants in Novy Urengoy meets the requirements of GOST R 54534-2011 “Resource conservation. Sewage sludge. Requirements for use for reclamation of disturbed lands” belongs to group I and can be used for biological reclamation as a soil component. The studies were carried out on three soils (variants) of different composition: the first group of soils under study consisted of lowland peat and sewage sludge; the second group is made from river sand and sewage sludge; the third group is made from lowland peat, river sand and sewage sludge. According to research results, the use of sewage sludge is recommended in soil to sludge ratios of 1 : 0.5 and 1 : 1. These ratios have the greatest positive effect on the germination of test culture plants, on the length of their aboveground part and root system in all three groups of soils: Peat : WWS, Sand : WWS, Peat + sand : WWS. The use of sediment in a ratio of 1 : 0.25 does not have a significant effect on plants in the soil samples Peat : WWS, Sand : WWS, Peat + sand : WWS, and with the component ratio Peat : WWS, Sand : OSV 1 : 1.5 has a inhibitory effect on test culture plants. In soil samples Peat + sand: WWS with a ratio of 1 : 1.5, no inhibitory effect was detected, but the difference in the assessed indicators from the 1 : 1 ratio is insignificant. The root system of test culture plants develops better on soil samples that contain sand.