Patent ID: 8840786
Filing Date: 2014-09-23
Classification: B03D,C02F

Abstract:
1. A system for removing dissolved contaminants, the contaminants comprising: particulate contaminants, emulsified oil contaminants, and micro-oil droplet contaminants from a refinery waste water, the system comprising: a gas floatation and primary oil contaminant removal subsystem comprising a tank having a processed water outlet, the tank connected to a source of the refinery waste water and a source of positively charged gaseous microspheres, the source of positively charged microspheres positioned to contact the free-oil contaminants in the refinery wastewater to form flocs of oil micro-droplets and gaseous microspheres in the tank; a floc removal subsystem positioned in the tank and having a skimmer positioned to remove the flocs of oil micro-droplets and gaseous microspheres from the tank to produce a processed water effluent; and a contaminant removal subsystem positioned downstream from, and in fluid communication with the processed water outlet of the gas floatation and primary oil contaminant removal subsystem, the contaminant removal subsystem comprising a source of a weighting agent positioned to contact at least the emulsified oil contaminants in the processed water to settle contaminants, the contaminant removal subsystem having an outlet constructed and arranged to provide a clarified water having less than about 5 ppm of at least one of oil contaminants and particulate contaminants without the use of any membranes or filters.