A system for recovering fat, oil and grease (FOG) from wastewater has multiple annular flotation zones in a concentric configuration surrounding a central column to create progressively increasing surface areas for FOG and solid particles flotation, and thereby enhance FOG recovery and removal. Each flotation zone is equipped with an independent pressurized micro air and ozone bubbles distribution system. A controlled amount of ozone can be injected into the wastewater along with recirculated effluent and micro-size air bubbles. Upon the release of pressurized air-ozone-water mixture, micro-size bubbles are generated and distributed in each flotation zone to effectively float up FOG and solid particles in the wastewater stream.

A method for stabilising a froth or a foam comprising subjecting the froth or foam to vibrations or sound waves having a frequency of less than 20 kHz. The frequency may be less than 1 kHz, for example, a frequency of from 300 Hz to 500 Hz, or from 300 to 450 Hz, or from 300 to 400 Hz. A method for froth flotation is also described.

The present disclosure provides for devices, systems, and methods of separating PFAS compounds from wastewater leachate. After separation, the PFAS compounds can be rendered less harmful. The present disclosure provides for devices, systems, and methods that uses aeration-induced foaming to isolate PFAS from landfill leachate into a concentrated, volume reduced liquid (coalesced foam), which can be separated and treated.

“VINASSE TREATMENT PROCESS BY FLOTATION IN FLOW”, more precisely, it is a vinasse treatment process, by high performance flowing flotation system in industrial plants' facilities, resulting in obtaining concentrated vinasse sludge and treated vinasse, being said process comprised by vinasse treatment, which consists of treatment steps performed inside flotation tank, which comprises succession of coagulation systems and basins, flocculation, combined with aeration and oxygenation, in addition to a system of nano and micro bubbles in flotation basin, in which vinasse naturally flows into its storage tank, being said process results in formation of surface sludge and treated vinasse.

A water treatment apparatus using a lamella structure according to an embodiment of the present invention includes a first treatment tank which includes a plurality of inclined plates and is configured to pass water subject to treatment between the inclined plates adjacent to each other and a second treatment tank which is installed at a rear end of the first treatment tank to accommodate the water subject to treatment and into which bubbles are supplied, wherein the plurality of inclined plates include positive electrode plates and negative electrode plates that are alternately arranged, and the water subject to treatment passes between the positive electrode plate and the negative electrode plate.

A device and method for cleaning contaminated solid-liquid mixtures by removing impurities and contaminants from an aqueous paper fiber suspension by flotation. Apparatus includes a first conduit (2) for a liquid, a second conduit (3) for a solid-liquid mixture, a third conduit (4) connecting first and second conduit (2, 3), a Venturi mixing element (5) with cones (7, 11), having small through-opening into chamber (9) which forms a cavity with small through-opening (12, 13) of the cones; the through-opening of first cone (7) connected with first conduit (2) and the rough-opening connected to second conduit (2), the small through-opening (12) of first cone (7) and the non-conical conduit sections arranged in longitudinal axial alignment, a fourth conduit (6) for conveying gas, wherein the fourth conduit (6) opens to the Venturi mixing element (5), and a fractionator arranged downstream of the second conduit (3) for removing the foam produced by flotation.

Installation for treating water by flotation, comprising a substantially parallelepipedal assembly (1) produced by connecting modules (2, 2a), said assembly comprising a contact tank (3) which is provided with supply means for water to be treated (4) and supply means for white water (5), a flotation tank (6) which is provided with means for discharging treated water (7, 7a) and which is separated from said contact tank by a vertical wall (8), and means for discharging floated sludge, characterised in that said contact tank (3) is provided along said flotation tank (6) and delimits a single contact zone for said water to be treated with said white water, and in that said supply means for water to be treated (4) are configured to distribute the water to be treated in said contact tank according to a longitudinal water supply flow, the water distribution flow in the flotation tank being perpendicular to said water supply flow in said contact tank.

Several agitators for generating a mixture are described which generally have a housing and an impeller rotatably mounted within the housing. The impeller has a first end with a first end face, and plurality of protuberances and at least one compressed gas channel outlet disposed on the first end face. The agitator also has a mixing chamber that is located adjacent to the plurality of protuberances, a fluid inlet extending through the housing for supplying a mixing fluid to the mixing chamber, and a fluid outlet extending through the housing for discharging the mixture from mixing chamber. When the compressed gas and the mixing fluid are supplied to the mixing chamber, the compressed gas becomes uncompressed gas, and rotation of the impeller agitates the uncompressed gas and the mixing fluid and disperses the uncompressed gas and at least a portion of the mixing fluid to generate the mixture.

A sparger for injection of bubbles into a flotation system comprises a housing, a movable rod assembly, and a sensor system that comprises a sensor and a target that move relative to each other. One of the sensor and the target is located in the housing and the other is located on or attached to the movable rod assembly. The sensor for measuring motion, including position and vibration, relative to the target based on the movement of the movable rod assembly. The sensor system for determining operating parameters of the sparger based on the analysis of the measurement of the motion of the sensor relative to the target.

A fluidized-bed flotation unit, its use, a mineral processing apparatus, and a fluidized-bed flotation method are disclosed. The fluidized-bed flotation unit includes a tank for holding a volume of slurry. The tank includes a launder with a launder lip, a fine slurry outlet below the launder lip, and a coarse slurry outlet below the fine slurry outlet for discharging coarse output slurry from the volume of slurry. The fluidized-bed flotation unit includes a solid-liquid separation arrangement configured to collect output slurry from the volume of slurry via the fine slurry outlet and to separate suspended solids and flotation liquid from the output slurry to form a solids portion and a liquid portion.