FIELD: agriculture.
SUBSTANCE: group of inventions can be used in agriculture in the regions of irrigated agriculture for fertigation: irrigation and simultaneous application of mineral fertilizers in the form of solutions. Method and installation options for its implementation include the processing of source water in three successively located ion-exchange columns – two with cationite (C3, C1) and one (C2) with anion exchange resin in the form of agrochemically valuable components of the obtained complex mineral fertilizer. Solution from the exit of the second along the flow of the cation column (C1) is sent to the nanofiltration (NF) unit to obtain a concentrate and permeate. One part of the latter is sent to the anion exchange column (C2) to produce a solution of complex mineral fertilizer at its outlet, and the other to the desalination plant (DES) to obtain demineralized water at the same time as the fertilizer to prepare the fertigation solution. Salt concentrate after desalination, collected in reservoirs (R1), is used for regeneration of the cation exchanger in the column (C1), and regenerate of this column together with the salt containing the cationic component of the resulting fertilizer - for regeneration by the first column (C3). In the anion exchange column (C2), regeneration is carried out using a salt containing the anionic component of the resulting fertilizer. Installation options are different schemes for the preservation and reuse of the regenerating solution, displaced from the free volume of the columns. In one embodiment, a common reservoir (R1) is used for externally supplied and displaced regenerating solution, and in the other, two separate containers.
EFFECT: inventions prevent ingress of harmful components into the resulting mineral fertilizer, disruption of the desalination plant, as well as the formation of insoluble precipitates in columns and waste solutions; in addition, the concentrate after nanofiltration is additionally obtained by complex fertilizer.
27 cl, 9 dwg, 16 tbl, 6 ex
