FIELD: water treatment. SUBSTANCE: water treatment plant containing in-series connected water chemical- treatment unit, chemically treated water heater, deaerator, pump, multistep evaporation installation with secondary steam manifold having branches to deaerator and chemically treated water heater, is additionally provided with distillation sweetening installation with horizontal tubular apparatuses, which has heating steam manifold at its first inlet and blow pipeline at its first outlet. Secondary steam manifold in multistep evaporation installation is connected to plant manifold, blow pipeline in distillation sweetening installation to inlet of water chemical-treatment unit, and end condenser to second outlet and second inlet of distillation sweetening installation. EFFECT: reduced heat loss and reduced investment and operational cost of water chemical-treatment unit.
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