This study addresses the loss of land for other uses resulting from economic activities and waste disposal, highlights the need to develop alternative fertilizers suitable for the biological stage of land reclamation and subsequent landscaping, and examines the resource potential of industrial wastes for producing nutrient amendments. The most promising waste processing approaches involve producing sewage sludge-based fertilizers through composting with other industrial wastes of various origins. A combined computational and experimental approach was used to develop composting mixtures, enabling optimization of the C:N, moisture content, and pH while incorporating visual assessments during laboratory trial mixing. The fertilizers produced were assessed qualitatively and quantitatively for veterinary, sanitary, hygienic, toxicological, and agrochemical parameters in accordance with applicable regulatory requirements. A plant growth experiment using artificial soil demonstrated their effectiveness in improving key plant productivity parameters, including seed germination, plant biomass, and maximum plant height. Potential factors limiting fertilizer application were identified as toxic element contents and possible imbalances between moisture retention and air exchange caused by reduced soil substrate density at high fertilizer mass fractions. These findings confirm the feasibility of reusing wastes of various origins to restore land quality and expand the range of alternative fertilizers.

The article presents the analysis of the existing approach to wastewater sludge treatment and justifies the selection of the most promising management technology that allows maximum use of wastewater sludge resource po-tential. To obtain a useful product (biocompost) suitable for use as part of technogenic soil, experimental studies of aerobic stabilization of organic matter of dehydrated urban wastewater sludge with the addition of other waste by using passive composting technology were carried out. The technology is included in the list of best available technologies (BAT). The selection of the most optimal components for the mixture was based on the results of determining the C and N content, humidity and pH of the components used that ensured the composting of organic waste. The results of laboratory studies of the obtained biocompost according to the main agrochemical and sanitary-epidemiological indicators are presented. Testing was carried out according to the criterion of toxicity of the biocompost’s aqueous extract. The assessment of the technogenic soil was performed when using biocompost in its composition for compliance with existing hygienic requirements for soil quality in the Russian Federation. Based on the results of the vegetation experiment, optimal formulations of the technogenic soil were determined, i.e., the ratio of biocompost and sand, under which the most favorable conditions for plant growth are observed according to a combination of factors such as the number of germinated seeds, the maximum height of plants and the amount of biomass. The conducted research makes it possible to increase the proportion of recycled urban wastewater sludge in the future to obtain soils characterized by a high degree of nutrient availability for plants and potentially suitable for use in landscaping, the biological stage of reclamation of technogenically disturbed lands, as well as for growing herbaceous plants in open and protected soil.