Assessment of wastewater quality of various origins for targeted use in the soil reclamation system

The paper presents the results of a comprehensive study of model wastewater generated during the processing of wood biomass at various technological stages. The fundamental possibility of their use for the preparation of new target products in the soil reclamation system is demonstrated. Based on open data from the scientific literature, the agrochemical indicators of the composition of organic waste (bark, sawdust, lignin, sewage sludge) for fertilizer production are analyzed, since plant components from wood processing are traditionally used in composting processes. This technology also generates soil water with specific properties, which served as a basis for the study of specific wastewater generated during wood processing for soil reclamation and the creation of artificial soil layers. Based on a set of integral indicators, it was found that in concentrated form and with slight dilution, these specific streams can be assessed as toxic; however, with special preparation, they can serve as a biologically active substrate for green algae. Biotesting showed that the effluent from the wood preparation shop and the effluent from HTTM production in concentrated form are toxic to Daphnia magna Straus, but do not have an acute toxic effect on Paramecium caudatum and Chlorella vulgaris Beijer. With reasonable and necessary dilution with specially prepared solutions, the model compositions can exhibit growth-stimulating activity in relation to planting material recommended for landfill reclamation. The obtained results allow us to consider the studied wastewater, after appropriate preparation, as a promising secondary raw material for enriching degraded soils with organic matter, which is consistent with the principles of a circular economy and sustainable development of the forest industry. The practical significance of the work lies in substantiating the possibility of using liquid by-products of wood processing to create hydroseeding compositions for the reclamation of disturbed lands.

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