FIELD: chemistry.
SUBSTANCE: invention relates to system of discharge flow purification, such as rain water and sewages, containing hard particles and dissolved substances. System of water purification contains, at least, one retention layer, constructed for receiving water, flowing into system, with retention layer containing media, which have composition, intended for retention of phosphorus, which contain residues of water purification; drainage layer, including drainage system under retention layer, with retention layer and drainage layer being constructed and placed in such a way that, at least, part of water, passing through retention layer will be received by drainage system.
EFFECT: improvement of removal of excessive nitrogen and phosphorus from polluted water flows.
20 cl, 8 dwg, 4 tbl
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