METHOD FOR CONDUCTING WATER-CHEMICAL REGIME AND REGENERATION OF BAROMEMBRANE WATER TREATMENT PLANT USING UNIFIED CORRECTION AND WASHING COMPOSITION Russian patent published in 2021 - IPC C02F1/44 C02F1/52 C02F9/04 C02F9/08 B01D61/14 B01D65/06 

FIELD: water treatment.

SUBSTANCE: method for conducting the water-chemical regime and regeneration of a baromembrane water treatment plant using a unified correction-washing composition, including ultrafiltration blocks, booster and/or main reverse osmosis blocks, using a unified correction-washing composition containing FeCl₃ coagulant, NaClO (solution with a mass fraction of 50%), Na₂S₂O₅ (solution with a mass fraction of 10%), H₂SO₄ (solution with a mass fraction of 92%), NaOH (solution with a mass fraction of 42%), Na₅P₃O₁₀, trilon B, technical citric acid, Ecotrit® UNI 1 antiscalant, including pre-purification of the source water and chemical washing with acid and alkaline detergents, where coagulation with ferric chloride (FeCl₃) is used as a pre-purification of the feed water of ultrafiltration and reverse osmosis systems; to prevent the formation of soluble forms of iron and deposits of organic compounds on the membrane surface, the pH of the source water is maintained at the level of 8.2-9.0; as an acidic detergent of ultrafiltration and reverse osmosis systems, an aqueous solution of citric acid (2200 mg/dm³) with a temperature of 35-40°C, acidified with sulfuric acid (630 mg/dm³) to pH = 2.0 is used; as an alkaline detergent of ultrafiltration systems, an aqueous solution of sodium hypochlorite (100 mg/dm³) with a temperature of 30-35°C, alkalized with sodium alkali (400 mg/dm³) to pH = 12.0; as an inhibitor of salt deposition, the anti-scalant Ecotrit® UNI 1, which does not contain phosphates, is used.

EFFECT: creation of a universal and effective method for maintaining the WCR, which contributes to a minimum number of chemical washings by preventing deposits of membrane contamination.

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