Title : Treatment of a petrochemical industries wastewater from oil products with hydrophobic carbonate sludge
Technology for the adsorption treatment of a petrochemical industry's wastewater from oil films and dissolved oil products by developed powdery and granular sorption materials based on carbonate sludge is proposed. Carbonate sludge is an energy waste generated during the preliminary purification of raw water during liming and coagulation. The technological characteristics and the adsorption capacity of the sludge with respect to dissolved and emulsified oil products are determined. To increase the adsorption capacity and wettability by nonpolar compounds, it is proposed to carry out volumetric hydrophobization of carbonate sludge with Silor silicone fluid. Powdered material was obtained by modifying sludge (humidity 3%, particle size dh = 0.01–0.05 mm) with 100% Silor liquid with a volume ratio of the solid and liquid phase of 5: 1 followed by heat treatment at 150°C for 60 min until a constant mass was established. The oil capacity of the material of 0.95 g/g, the contact angle of 115°, and the technological characteristics of the sorption material were determined. For petrochemical industries' wastewater treatment from oil products, it is proposed to use the material for collecting floating oil films in the sumps of the technological scheme. Technology has been developed for producing granular sorption material: granules formed from carbonate sludge when mixed in a ratio of 1: 2 with a binder liquid sodium glass are heat-treated at 700°C for 60 min, then 5% are impregnated with Silor water emulsion and dried to constant weight. It is proposed to use granular material in technological schemes for the posttreatment of wastewater from dissolved oil products as a load in adsorption filters.