Sedimentation Analysis of the Dispersed Phase During Treatment of Phenolic Wastewater of Coke-Chemical Production by Glauconite

Abstract

Kinetic regularities of adsorption treatment of phenolic wastewater with glauconite have been revealed. It was found that glauconite at a dose of 2 g/dm3 in combination with a 0.1% solution of cationic flocculant, which provides removal of resinous substances up to 94% for 10 min and phenols up to 20% during 20 min. As a result, the MPC of phenols and resinous substances was achieved at the stage of mechanical treatment of effluents, which are then fed for biochemical processing into aeratanks, which is 415 mg/dm³ and 25 mg/dm3, respectively. The dispersed composition of sediments after treatment of industrial wastewater with glauconite was studied. It was found that the particle radii of the polydisperse system "liquid waste – glauconite" in combination with cationic flocculant were the largest and reached r = 537 mkm, which is twice the maximum polydisperse systems "liquid waste – glauconite" and "liquid waste – glauconite" with an anionic flocculant. Sedimentation analysis showed that the sedimentation time of the sediment decreased from 17 min to 6 min in the system "liquid waste – glauconite" in combination with cationic flocculant and formed a precipitate of loose flakes, which settled quickly. The introduction of a flotation plant with a dosage of natural glauconite 2 g/dm3 in combination with a 0.1% solution of cationic flocculant at industrial treatment facilities is proposed. Engineering solutions will improve the quality of wastewater supplied for coke quenching and will make it possible to transport and dispose of sludge after waste treatment with glauconite, which is planned to be used as a raw material for the manufacture of pavements in asphalt plants.