METHOD OF PURIFYING DAIRY INDUSTRY EFFLUENT WATER Russian patent published in 2008 - IPC C02F1/28 C02F103/32 

FIELD: chemistry.

SUBSTANCE: proposed method involves treatment of effluent water with a chemical reagent, mixing, holding and separation of the solid phase. The reagent used is clinoptilolite containing rocks - silicate zeolitic or carbonate silicate zeolitic rocks, containing the following minerals: clinoptilolite, calcite, opal, cristobalite, tridymite and quartz. The above mentioned rocks have the following chemical content in terms of oxides, in wt %: for silicate zeolitic rocks - SiO₂ 69.0-69.81, Al₂O₃ 4.22-7.61, TiO₂ 0.25-0.52, Fe₂O₃ 1.3-2.0, MgO 0.15-0.54, CaO 5.0-5.3, Na₂O 0.2-1.4, K₂O 1.49-2.27, P₂O₅ 0.33-0.42; for carbonate silicate zeolitic rocks - SiO₂ 45.0-47.0, Al₂O₃ 1.5-1.95, TiO₂ 0.1-0.2, Fe₂O₃ 0.5-0.57, MgO 2.0-3.0, CaO 20.0-22.3, Na₂O 0.6-0.7, K₂O 0.55-0.58, P₂O₅ 0.8-0.87. Treatment is carried out with the mass ratio of rocks to effluent water equal to 1:5-1:7, and the water is held for 20-30 minutes.

EFFECT: increased efficiency of purifying effluent water and prevention of secondary contamination of the filtrate, improved ecological situation during production.

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