A method and system for treatment of flow-back and produced water from a hydrocarbon well in which fracturing operations are carried out using a phase separation and creating of positive charge in the water.

In one aspect the invention provides a fluid treatment apparatus for treating contaminated fluid. The apparatus comprises a container having base member and a peripheral containment wall and defining a total interior volume. The apparatus further comprises at least one container inlet to receive said contaminated fluid, at least one container outlet to discharge water separated from said contaminated fluid, a separation region suitable to receive said contaminated fluid, to allow separation of said contaminated fluids into less dense contaminants, water and denser contaminants, and to store said denser contaminants as a sediment layer on the base member. The apparatus further comprises a water collection region suitable to receive water from the separation region and direct said water to said at least one container outlet, and an oil collection region, suitable to receive less dense contaminants from the separation region.

A method and system for treatment of flow-back and produced water from a hydrocarbon well in which fracturing operations are carried out using a phase separation and creating of positive charge in the water.

A method and system for treatment of flow-back and produced water from a hydrocarbon well in which fracturing operations are carried out using a phase separation and creating of positive charge in the water.

One or two continuous recirculation loops are utilized for the well-site equipment that separates produced fluids into sand, liquid, and gas during drill out and flow back that occurs after fracturing a subterranean formation. When one recirculation loop is utilized, the recirculation loop continuously recirculates fluid between the recirculation chamber of the disclosed sand removal apparatus and a shaker device. When two recirculation loops are utilized, the first recirculation loop continuously recirculates fluid between a recirculation chamber of the disclosed sand removal apparatus and a shaker device, and the second recirculation loop continuously recirculates fluid between the recirculation chamber and a gas separator.

A method and system for treatment of flow-back and produced water from a hydrocarbon well in which fracturing operations are carried out using a phase separation and creating of positive charge in the water.

Various aspects of the present disclosure are directed to sewage treatment plants and methods of operating sewage treatment plants. In one example embodiment, the sewage treatment plant includes a clarifier having an aeration region with a vent opening to blow in oxygenous gas for mixing water to be clarified and a settling region with an outlet. The sewage treatment plant further includes a wall system that delimits the at least one aeration region from the at least one settling region by the wall system. The wall system has a channel system which has at least one first opening leading to the aeration region in the region of the water level and a sludge removal device of the channel system in the region of a lower wall of the clarifier for transporting solids-rich water from the settling region into the aeration region.

An apparatus for treating a multiphase hydrocarbon-containing fluid in an oil and/or gas production facility, the apparatus comprising: (a) an inlet for a multiphase hydrocarbon-containing fluid, wherein the inlet comprises a first pipe network configured to be connectable to a plurality of oil well heads in an oil field; (b) a separation system comprising: (i) a solids separator in fluid communication with the inlet; (ii) a solids outlet connected to the solids separator; (iii) a fluid separator in fluid communication with the solids separator, the fluid separator being configured to separate the remaining multiphase hydrocarbon-containing fluid into an oil phase, a water phase and a gas phase; (iv) an oil outlet connected to the fluid separator; (v) a gas outlet connected to the fluid separator; and (vi) a water outlet connected to the fluid separator; (c) a solids cleaning system connected to the solids outlet, wherein the solids cleaning system is configured to clean deposits of residual oil from the solid particles separated by the solids separator to provide cleaned solid particles and first residual oil, the solids cleaning system having a first output for outputting the cleaned solid particles and a second output configured to output the first residual oil; and (d) a water cleaning and recycling system connected to the water outlet, wherein the water cleaning and recycling system is configured to clean residual oil from the water phase separated by the fluid separator, the water cleaning and recycling system comprising an oil filter for separating the residual oil from the water phase to provide cleaned water and second residual oil, the oil filter having a third output for recycling the cleaned water to at least one well head of the oil field, wherein the third output comprises a second pipe network configured to be connectable to the at least one well head of the oil field, and a fourth output configured to output the second residual oil. Also disclosed is a corresponding method.

One or two continuous recirculation loops are utilized for the well-site equipment that separates produced fluids into sand, liquid, and gas during drill out and flow back that occurs after fracturing a subterranean formation. When one recirculation loop is utilized, the recirculation loop continuously recirculates fluid between the recirculation chamber of the disclosed sand removal apparatus and a shaker device. When two recirculation loops are utilized, the first recirculation loop continuously recirculates fluid between a recirculation chamber of the disclosed sand removal apparatus and a shaker device, and the second recirculation loop continuously recirculates fluid between the recirculation chamber and a gas separator.

A method of treating oil and gas produced water may include: receiving produced water from one or more wells; separating an aqueous portion of the produced water from oil and solids included in the produced water in order to provide recovered water; performing anaerobic bio-digestion of organic matter included in the produced water using a biomass mixture of anaerobic bacteria obtained from a plurality of wells; aerating the recovered water in order to promote metal precipitation; and performing aerobic bio-digestion of organic matter present in the recovered water. Some embodiments may also include one or more of anoxic equalization, filtration, pasteurization, reverse osmosis, and biocide treatment of the recovered water. The recovered water may be used for oil and gas well fracking and/or land and stream application. Other methods of treating oil and gas produced water are also described.