An automated produced water treatment system that injects ozone or an ozone-oxygen mixture upstream of produced water separators, with the dose rate changing dynamically as the produced water quality changes, as determined by continuous monitoring of the produced water quality by a plurality of sensors that detect water quality parameters in real time. The system may operate as a “slipstream” injection system, that draws a portion of produced water from the produced water pipeline and injects ozone or an ozone-oxygen mixture back into the pipeline with disrupting or slowing normal operations. Disinfectants or other additives may also be injected. The treatment system may be wholly or partially contained in mobile containers or trailers, for on-the-fly use in existing produced water treatment facilities. Ozone and/or nitrogen micro-bubbles and/or nano-bubbles may be introduced for friction reduction in oil and gas operations.

A process for treating water contaminated with refractory organic matter, such as per- and polyfluoroalkyl substances (PFASs), comprising the following steps: (a) lowering the pH of the water for hydrolysis of organic matter; (b) subjecting the water with lowered pH to catalytic reduction by zero valent iron for organic matter degradation; (c) optionally aerating the water to oxidise the iron to ferric hydroxide; (d) optionally clarifying the water; and (e) optionally a catalytic advanced oxidation step. A system for conducting the process is also disclosed.

A built-in micro-interface papermaking wastewater treatment system and a treatment method are provided in the present invention. The treatment system includes a papermaking wastewater tank, a grid cleaner, an adjustment tank, a centrifugal filter and a sedimentation tank which are connected in sequence, and further includes a heat exchanger, a preheater, a wet oxidation reactor, a gas-liquid separator and a biodegradation tank. A micro-interface unit for dispersing and crushing gas into gas bubbles is disposed inside the wet oxidation reactor. The micro-interface unit includes a pneumatic micro-interface generator, a gas inlet is disposed at a side wall of the wet oxidation reactor, and the gas inlet extends to an interior of the pneumatic micro-interface generator through a pipeline. By arranging the micro-interface unit inside the wet oxidation reactor of the treatment system, the consumption of air or oxygen can be reduced, which realizes low energy consumption and high treatment efficiency.

A built-in micro-interface papermaking wastewater treatment system and a treatment method are provided in the present invention. The treatment system includes a papermaking wastewater tank, a grid cleaner, an adjustment tank, a centrifugal filter and a sedimentation tank which are connected in sequence, and further includes a heat exchanger, a preheater, a wet oxidation reactor, a gas-liquid separator and a biodegradation tank. A micro-interface unit for dispersing and crushing gas into gas bubbles is disposed inside the wet oxidation reactor. The micro-interface unit includes a pneumatic micro-interface generator, a gas inlet is disposed at a side wall of the wet oxidation reactor, and the gas inlet extends to an interior of the pneumatic micro-interface generator through a pipeline. By arranging the micro-interface unit inside the wet oxidation reactor of the treatment system, the consumption of air or oxygen can be reduced, which realizes low energy consumption and high treatment efficiency.

A method for treating wastewater containing organic contaminants is disclosed. Wastewater containing organic contaminants is fed into an outer pipe of a pipe-in-pipe assembly, wherein the outer pipe concentrically surrounds an inner pipe. Oxygen is fed into the inner pipe which is rotatably mounted and is provided with openings, thereby to provide different sizes of oxygen bubbles to the outer pipe. The oxygen is dispersed into an annular portion between the outer pipe and the inner pipe thereby contacting the wastewater with oxygen; and the thus treated wastewater is collected. The inner pipe may be a tunable membrane material, and the outer pipe may have a biocatalyst material present on its inner surface.

Disclosed are methods, apparatuses and systems for the remediation of contaminated soils, groundwater, water, and/or waste using a combination of reagents. The disclosed methods may be used to treat various recalcitrant halogenated substances, such as perfluoroalkyls and polyfluoroalkyls. Particular combinations of reagents that may be used in the disclosed methods include but are not limited to: (1) persulfate, oxygen and ozone; (2) persulfate, salt, oxygen and ozone; (3) persulfate, phosphate, and/or oxygen; (4) persulfate, phosphate, oxygen and ozone; (5) persulfate, phosphate, salt and oxygen (6) persulfate, phosphate, salt, oxygen and ozone; (7) oxygen and salt; and (8) air and salt. The disclosed methods may enhance destruction of organic contaminants in the liquid phase and may also control the rate of aerosol or foam formation relative to the rate of chemical oxidation and/or reduction/transfer.

Methods and systems are provided for disinfecting water mains using ultraviolet (UV) light and advanced oxidation processes. One or more UV light sources are provided and secured to a movable device that moves axially in a pipe. The frequency and intensity of the UV light is determined based on characteristics of the pipe, such as its material and size. The rate at which the movable device moves through the pipe is also determined so that the interior surface of the pipe is properly disinfected. The movable device is remotely caused to move through the pipe. An oxidant supply component having a dispensing portion dispenses an oxidizing agent into the pipe. A portion of the emitted UV light may convert the dispensed oxidizing agent into additional oxidizing agents that further disinfect the pipe.

Provided is a clarifier unit of wastewater treatment system and a system comprising the unit, the unit including a treatment tank having a bottom wall, side walls, influent inlet, clarified water outlet and a sludge discharge outlet; wherein the unit has an oxygen supply assembly, including one or more oxygen supply elements confined to a bottom portion of the tank, each of which includes (i) a water-tight enclosure including oxygen-permeable membranes permitting oxygen permeation by, for example, a diffusion from the enclosure to a surrounding medium, and (ii) a gas inlet for receiving an oxygen-containing gas and a gas outlet for removal of gas.

A process for treating water containing contaminants comprising the steps of: (a) contacting water to be treated with an inorganic oxidising salt containing manganese or iron for a time effective for oxidising a portion of said contaminants; (b) contacting water treated in oxidation step (a) with at least a chlorine containing agent for disinfection and to generate, in situ and through reaction with chemical compounds produced in pre-oxidation step (a), a coagulant for coagulating oxidised contaminants present in the water; (c) separating coagulated contaminants from the water; and (d) subjecting water to a catalytic oxidation for oxidising residual oxidisable contaminants, said catalytic oxidation being catalysed, in part, by manganese or iron species, depending on the residual selected oxidising salt left in solution in water after oxidation step (a). Permanganates are particularly advantageous inorganic oxidising salts and chlorine dioxide is a particularly preferred chlorine containing disinfecting agent for use in step (b). Apparatus for conducting the process is also disclosed.

Disclosed is a multifunctional continuous hydrothermal oxidation experiment system, comprising a reactor (12), wherein an inlet of the reactor (12) is connected in parallel with an oxidant pipeline and a material pipeline; the oxidant pipeline comprises a gas oxidant delivery pipe and a liquid oxidant delivery pipe connected in parallel, and the gas oxidant pipe comprises an air oxidant delivery pipe and an oxygen delivery pipe connected in parallel; and a heat exchanger and a preheater are sequentially connected in series on the oxidant pipeline and the material pipeline, the oxidant pipeline and the material pipeline are in communication with an inner pipe of the heat exchanger; and the outlet of the reactor (12) is sequentially in communication, by means of piping, with a corrosion experiment device (14), an outer pipe of the heat exchanger, a cooler (16) and a gas-liquid separator (17).