This equipment is specifically designed for treating various types of oily emulsion wastewater, such as machining cutting fluids, rolling fluids, and oily cleaning wastewater. By automatically adding a demulsifier, the stable interface of the emulsion is disrupted, causing oil droplets to coalesce and precipitate. The oil is then efficiently separated by an oil-water separator. The system integrates a dosing device (dosing tank, mixer, dosing pump), a reaction tank (with agitator), and an oil-water separator. It features a high degree of automation, thorough demulsification, and can reduce the oil content of the effluent to a very low level.

core components

Fully Automatic Dosing System: Includes a corrosion-resistant dosing tank (PE/PP/stainless steel), a top-mounted mixer, and a high-precision dosing pump (mechanical diaphragm or metering pump). Used for adding inorganic or organic demulsifiers.

Demulsification Mixing Tank: Equipped with a variable-speed or constant-speed mixer to ensure thorough mixing and reaction of the demulsifier with the emulsion, rapidly breaking down the oil-water interface film.

Oil-Water Separator: Employs gravity separation, inclined plate coalescence, or air flotation-assisted separation structures to efficiently collect floating oil and discharge clean water.

Electrical Control System: PLC fully automatic control, capable of联动 (linking) water intake, dosing, mixing, oil discharge, and sludge discharge; supports manual/automatic switching and remote monitoring.

Working principle

Demulsification: The oil-containing emulsion enters the reaction tank, and an automatic dosing device adds demulsifier according to a set ratio. A mixer promotes rapid contact between the agent and the emulsion, breaking down the emulsion layer and causing tiny oil droplets to coalesce into larger droplets or oil flocs.

Oil-Water Separation: Utilizing the density difference between oil and water, the floating oil rises to the top and is sucked into an oil-water separator. A small amount of clear water is discharged from the bottom. Some equipment can be equipped with an oil skimmer or oil suction device.

Automatic Oil and Sludge Discharge: Waste oil in the oil collection tank is periodically discharged automatically or manually; a small amount of sludge settled at the bottom is periodically cleaned.

Main advantages

High demulsification efficiency: Customized dosing schemes for different emulsions, achieving oil removal rates of over 95%.

Fully automatic operation: Online pH or turbidity linkage control for dosing, with timed and quantitative dosing also possible, saving labor.

Wide applicability: Suitable for oily wastewater from industries such as machining, steel rolling, petrochemicals, and metal surface treatment.

Compact structure: Integrated skid-mounted design for easy installation and small footprint.

Corrosion-resistant design: Parts in contact with chemicals or oil are made of 316L stainless steel, PP, or PVDF.

Technical parameters:

Processing capacity: 1 – 50 m³/h (larger sizes available upon customization)

Reaction tank mixer power: 0.55 – 5.5 kW

Demulsifier dosing pump flow rate: 5 – 500 L/h

Dosing tank volume: 100L – 1500L/set

Oil-water separator type: Gravity type / Flotation-assisted type

Material: PP / 304/316L stainless steel

Application areas

Wastewater from CNC machine tools, cutting fluids, and grinding fluids; cold rolling emulsions and cleaning fluids from steel mills; pretreatment of produced water and oily wastewater from oil fields; wastewater from automobile and auto parts cleaning; wastewater from oil tank cleaning and ship ballast water. We can provide dosing formulations and equipment selection suggestions based on your emulsion composition, oil concentration, and treatment volume. Please send your water sample analysis report to obtain a customized solution.

Automatic dosing demulsification equipment 0

Tags: