Automatic dosing demulsification equipment

Automatic dosing demulsification equipment | High-efficiency oil-water separation and intelligent demulsification system

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.

Company Profile

AA SS AQUA HITECH CO., LTD. was established in 2005 in Shenzhen, China. It is a leading technology enterprise specialized in the design, manufacturing, installation, commissioning and maintenance of technical solutions for high-difficulty industrial wastewater treatment projects.

Since its establishment, the company has been fully committed to the research of treatment technologies for high-difficulty and refractory industrial wastewater, wastewater recycling and reuse technologies, and wastewater zero-discharge technologies. It strives to achieve low project costs, high outputs and optimization of total social resources.

The water treatment technology solutions and achievements developed by the company have been widely applied in multiple fields of high-difficulty and refractory organic wastewater treatment, including pharmaceutical wastewater, chemical wastewater, pesticide wastewater, laboratory wastewater, coal chemical wastewater, petrochemical wastewater, breeding wastewater, slaughterhouse wastewater, semiconductor wastewater, printing and dyeing wastewater, coating wastewater, landfill leachate, food processing wastewater, mechanical processing wastewater and domestic wastewater.

Adhering to the business philosophy of leading technology, first-class quality and sustainable service, the company endeavors to provide customers with strong technical support and realize the sustainable development and utilization of water resources.

The electrochemical wastewater treatment equipment independently developed and invented by our company can achieve a removal rate of over 99% for COD and ammonia nitrogen in refractory industrial organic wastewater featuring high salinity, high toxicity, high concentration and strong acidity or alkalinity. It has solved the long-standing problem of high-difficulty and complex wastewater treatment in the industrial wastewater treatment industry, representing a significant breakthrough in the treatment scope, methods and effects of high-difficulty and complex industrial wastewater.

CQDHX SERIES EO Electrochemical Advanced Oxidation Technology

Cutting-edge Electrode Manufacturing Technology

Over a 15-year period starting from 2010, we have been dedicated exclusively to the R&D, manufacturing and application of electrodes. Having completed more than 3,000 verification tests on electrode materials and manufacturing processes, as well as over 5,000 experiments on different types of highly complex wastewater, we have tailored the compositions of electrode substrates, surface materials and the deposition conditions of electrode surfaces by integrating the characteristics of various highly complex wastewater types. This has enabled us to achieve optimal performance in treating different categories of highly complex wastewater.

The CQDHX Series Electrode Modules are capable of meeting the requirements for treating highly complex industrial wastewater under extreme conditions. They can effectively remove organic matter (COD), ammonia nitrogen, toxic substances, bacteria, chromaticity, phosphorus and various heavy metals from refractory industrial organic wastewater characterized by high salinity, high toxicity, high concentration and strong acidity or alkalinity.

Working Mechanism of CQDHX SERIES EO Electrode Modules

Electrochemical oxidation is a technology that utilizes an applied electric field to drive chemical reactions for pollutant degradation. Its core reaction occurs at the anode of the electrolytic cell, and the operating mechanisms are primarily categorized into two types: direct oxidation and indirect oxidation, which often function synergistically.

Direct Oxidation Mechanism: Pollutant molecules migrate to and adsorb onto the anode surface. Subsequently, the anode, acting as an electron acceptor, directly extracts electrons from the pollutant molecules, causing their oxidative decomposition. This process is controlled by the mass transfer rate and relies on the catalytic activity and adsorption properties of the anode material, exhibiting a certain degree of selectivity towards different pollutants.

Mechanism of Indirect Oxidation: The anode does not directly oxidize pollutants. Instead, it generates highly oxidizing agents by electrolyzing components within the solution. These agents then diffuse into the bulk solution and carry out homogeneous oxidation of the pollutants. Depending on the type of oxidants generated, the main pathways can be categorized as follows:

Electrochemical oxidation achieves pollutant degradation through two main mechanisms: electron transfer at the anode surface and the in-situ generation of highly oxidizing species. In practical applications, particularly for complex wastewater systems, direct and indirect oxidation often work synergistically. By optimizing electrode materials and process parameters, efficient and advanced treatment of organic pollutants can be achieved.

 Technical Advantages

High Salinity Tolerance: It can effectively remove COD and ammonia nitrogen from unsaturated saline wastewater with a removal rate of up to 99%.

High Toxicity Tolerance: It can effectively remove COD and ammonia nitrogen from highly biotoxic wastewater with a removal rate of up to 99%, while efficiently eliminating the biological toxicity of the wastewater.

High Concentration Tolerance: It can effectively remove COD and ammonia nitrogen from high-concentration organic industrial wastewater with a COD level of ≤ 450,000 mg/L, achieving a removal rate of up to 99%.

Strong Acid-Alkali Tolerance: It can effectively remove COD and ammonia nitrogen from strongly acidic or alkaline wastewater with a pH value ranging from 1 to 11, with a removal rate of up to 99%.

High Safety: The equipment operates at a DC voltage ranging from 3 to 15V, causing no harm to the human body.

No chemical agents are added during wastewater treatment, and no residues or solid wastes are generated.

The electrode modules operate without scaling or clogging.

The equipment achieves a removal rate of 75–100% for high ammonia nitrogen, cyanide breakdown, decolorization, and other pollutants.

No pH adjustment is required for incoming wastewater, which significantly saves on acids, alkalis, labor costs, and floor space, while avoiding secondary pollution.

No water dilution is needed to reduce the salinity of incoming wastewater, decreasing the system’s treatment load and conserving resources.

No water dilution is needed to reduce the COD concentration of incoming wastewater, decreasing the system’s treatment load and conserving resources.

The equipment features a small footprint, occupying approximately 2% of the floor space required by traditional processes of the same capacity.

The equipment has no special environmental requirements and can be installed in well-ventilated, rainproof, non-explosion-proof areas.

The equipment operates with no noise and zero discharge of secondary pollutants.

It features fully automated operation, which is simple, safe, and does not require on-site personnel monitoring.

Equipment Specifications: 0.5T–1000T/h

Electrochemical Oxidation Equipment for Treating Common Pollutants

Application Scenarios:

Treatment of Refractory and Toxic Pharmaceutical Wastewater

Treatment of Refractory and Toxic Chemical Industry Wastewater

Treatment of Refractory and Toxic Pesticide Wastewater

Treatment of Refractory and Toxic Laboratory Wastewater

Treatment of Refractory and Toxic Coal Chemical Industry Wastewater

Treatment of Refractory and Toxic Petrochemical Wastewater

Treatment of Aquaculture Wastewater

Treatment of Slaughterhouse Wastewater

Treatment of Refractory and Toxic Semiconductor Industry Wastewater

Treatment of Refractory and Toxic Dyeing Wastewater

Treatment of Refractory and Toxic Painting/Paint Coating Wastewater

Treatment of Refractory and Toxic Landfill Leachate

Treatment of Food Processing Wastewater

Treatment of Refractory Machining Wastewater

Treatment of Domestic Sewage