The invention relates to environment protection, in particular, to a technology for neutralization of filtrates, which are formed in a layer of solid domestic and industrial wastes landfills (dumps) under the action of atmospheric precipitates, and more particularly, to purification, collection and destroy of the filtrates. The invention mitigates toxicity of said filtrates, which in the course of percolating through a wastes layer, excrete toxic substance(s) therefrom and/or are saturated by their decomposition products, which are subsequently be released to cause contamination of subsoil water and/or the environmental soil.