The use of ameliorants based on the finely dispersed fraction of waste from limestone quarries and microalgae Chlorella vulgaris in a closed cycle of waste management in the primary sector of the economy

Waste from limestone quarries is a product of primary industry and the extraction of building material, and their finely dispersed fraction often remains unclaimed and is stored. This causes environmental and economic problems, as these materials are easily dispersed by gravity, water, and wind. The purpose of this work is to substantiate an innovative method for the disposal of finely dispersed waste from open pits, including in the process of biological reclamation of the quarries themselves, based on the results of a study of the properties of these materials. In the course of the study, an experimental approach was used, which compared the results of growing plants on substrates: a pure finely dispersed fraction of waste, a mixture of a fine fraction and vermicompost, as well as pure vermicompost. Special attention was paid to the study of the effect of chlorella-based additives. The results of the study showed that the finely dispersed fraction of waste from limestone quarries can be successfully used in agricultural practice as a component of the substrate for growing plants, in combination with additives based on the culture of unicellular algae. Such a substrate has the necessary nutrients and stimulates plant growth. The findings could contribute to the development of a circular economy, in which waste from one process becomes resources for another, minimizing losses and reducing environmental impact. In particular, they serve as a substantiation of the scheme developed by the authors for closing technological cycles within the framework of the industrial symbiosis of economic entities of three different industries – a depleted limestone quarry, small farms and an enterprise that creates and operates a tourist facility as a result of reclamation and landscape rehabilitation of a depleted quarry.

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