A method for treating process water of a flotation arrangement, the flotation arrangement including a flotation arrangement including a mineral flotation line and a process water treatment arrangement for treating underflow of the of the mineral flotation line. The method includes the steps of a) dewatering underflow from the flotation in a gravitational solid-liquid separator; b) subjecting supernatant from step a) to cleaning flotation for collecting at least fine particles and residual flotation chemicals, for separating at least fine particles and residual flotation chemicals from the supernatant into cleaning flotation overflow, and for forming purified process water as cleaning flotation underflow; c) removing cleaning flotation overflow as tailings, and d) recirculating purified process water into the mineral flotation line.

A method for treating process water of a flotation arrangement, the flotation arrangement including a flotation arrangement including a mineral flotation line and a process water treatment arrangement for treating underflow of the of the mineral flotation line. The method includes the steps of a) dewatering underflow from the flotation in a gravitational solid-liquid separator; b) subjecting supernatant from step a) to cleaning flotation for collecting at least fine particles and residual flotation chemicals, for separating at least fine particles and residual flotation chemicals from the supernatant into cleaning flotation overflow, and for forming purified process water as cleaning flotation underflow; c) removing cleaning flotation overflow as tailings, and d) recirculating purified process water into the mineral flotation line.

An oil, water, and solid impurity separation device capable of realizing crude oil gathering and transferring is provided, which includes: a centrifuge including a liquid mixing inlet communicated to an inside thereof, and pure crude oil outlets disposed at two sides of the liquid mixing inlet and used for injecting a filtered liquid; a strainer, an input end of which is connected with one pure crude oil outlet through a pipeline, a vacuum power assembly for providing power is arranged on the pipeline; a filtering assembly, an input end of which is connected with an output end of the strainer, two individual branches are formed by an output part of the filtering assembly and an oil discharging assembly, as well as the output part of the filtering assembly and an impurity discharging assembly, respectively; one branch is an oil outlet, and another branch is an impurity outlet.

The present disclosure provides an apparatus comprising a primary treatment system configured to remove solids from an untreated fluid to generate a primary treated fluid. The apparatus further comprises an oxidation treatment system including an inlet configured to receive the primary treated fluid, an ozone inlet configured to receive ozone from an ozone generator, and an outlet configured to dispense secondary treated fluid. The apparatus may further comprise a controller in electrical communication with the ozone generator. The controller is programmed to regulate the flow of ozone through the oxidation treatment system such that an effective amount of ozone contacts the primary treated fluid to generate the secondary treated fluid. In some embodiments, the secondary treated fluid discharging from the oxidation treatment system has a chemical oxygen demand (COD) removal level of greater than 85%.

The present disclosure provides an apparatus comprising a primary treatment system configured to remove solids from an untreated fluid to generate a primary treated fluid. The apparatus further comprises an oxidation treatment system including an inlet configured to receive the primary treated fluid, an ozone inlet configured to receive ozone from an ozone generator, and an outlet configured to dispense secondary treated fluid. The apparatus may further comprise a controller in electrical communication with the ozone generator. The controller is programmed to regulate the flow of ozone through the oxidation treatment system such that an effective amount of ozone contacts the primary treated fluid to generate the secondary treated fluid. In some embodiments, the secondary treated fluid discharging from the oxidation treatment system has a chemical oxygen demand (COD) removal level of greater than 85%.

In one or more embodiments, the present invention relates to a method for producing a polyhydroxybutyrate-based resin. The method includes (a) disrupting or solubilizing microbial cells containing a polyhydroxybutyrate-based resin, and (b) separating the polyhydroxybutyrate-based resin from a composition obtained by the process (a). The process (a) and the process (b) use water with a calcium ion concentration (14.5 mg/L or less. The water used in the process (a) and the process (b) is preferably obtained by subjecting wastewater that is discharged from the production process of the polyhydroxybutyrate-based resin to microbial anaerobic and aerobic treatments, subsequently pre-filtration by a membrane bioreactor process, and further filtration with a calcium ion removal membrane This method provides the polyhydroxybutyrate-based resin with good color tone and high thermal stability.

A sewage and seawater purification apparatus has a first pump, a coarse filter, a second pump, a first centrifugal filter, a third pump, a second centrifugal filter, a fourth pump, at least one electro dialysis device, and an end storage tank. The coarse filter is connected to the first pump. The second pump is connected to and communicates with the coarse filter. The first centrifugal filter is connected to and communicates with the second pump. The third pump is connected to and communicates with the first centrifugal filter. The second centrifugal filter is connected to and communicates with the third pump. The fourth pump is connected to and communicates with the second centrifugal filter. The at least one electro dialysis device is connected to and communicates with the fourth pump. The end storage tank is connected to and communicates with the at least one electro dialysis device.

A sewage and seawater purification apparatus has a first pump, a coarse filter, a second pump, a first centrifugal filter, a third pump, a second centrifugal filter, a fourth pump, at least one electro dialysis device, and an end storage tank. The coarse filter is connected to the first pump. The second pump is connected to and communicates with the coarse filter. The first centrifugal filter is connected to and communicates with the second pump. The third pump is connected to and communicates with the first centrifugal filter. The second centrifugal filter is connected to and communicates with the third pump. The fourth pump is connected to and communicates with the second centrifugal filter. The at least one electro dialysis device is connected to and communicates with the fourth pump. The end storage tank is connected to and communicates with the at least one electro dialysis device.

Provided are direct solvent contact crystallization devices and methods. A direct solvent contact crystallization device can comprises a first liquid-liquid separator comprising an inlet stream comprising 10-35 wt. % salt and a first outlet stream comprising water and a solvent; a second liquid-liquid separator comprising an inlet stream comprising the first outlet stream of the first liquid-liquid separator and a first outlet stream comprising 95 wt. % or greater water; and a separation unit comprising an inlet stream comprising a second outlet stream of the second liquid-liquid separator, a first outlet stream comprising the solvent, and a second outlet stream comprising a recovery agent, wherein the inlet stream of the first liquid-liquid separator comprises the first outlet stream of the separation unit, and the inlet stream of the second liquid-liquid separator comprises the second outlet stream of the separation unit.

Provided are direct solvent contact crystallization devices and methods. A direct solvent contact crystallization device can comprises a first liquid-liquid separator comprising an inlet stream comprising 10-35 wt. % salt and a first outlet stream comprising water and a solvent; a second liquid-liquid separator comprising an inlet stream comprising the first outlet stream of the first liquid-liquid separator and a first outlet stream comprising 95 wt. % or greater water; and a separation unit comprising an inlet stream comprising a second outlet stream of the second liquid-liquid separator, a first outlet stream comprising the solvent, and a second outlet stream comprising a recovery agent, wherein the inlet stream of the first liquid-liquid separator comprises the first outlet stream of the separation unit, and the inlet stream of the second liquid-liquid separator comprises the second outlet stream of the separation unit.