How ultrasonic filtration systems work and where oil and other contaminants are stored after filtration.

The working principle of ultrasonic filtration system

Ultrasonic Cavitation Effect

The system installs an ultrasonic transducer near the filter medium (such as a filter screen or filter film) to emit high-frequency sound waves (usually 20kHz ~ 1MHz).

Sound waves generate a "cavitation bubble" in the liquid, which instantly releases shock waves when the bubble bursts, which can break contaminant aggregates (such as oil sludge, particles) and prevent filter hole clogging.

Synergistic filter mechanism

Physical filtration: Traditional filter materials (such as metal filters, ceramic membranes) intercept larger particles.

Ultrasonic Assistance: Ultrasound forces tiny particles away from the filter surface, improving filtration efficiency and extending filter life.

Separation process: For oil and water mixtures, ultrasound can also accelerate oil and water separation (using density differences).

Multi-level processing (optional)

Some systems combine centrifugal separation, adsorption materials (such as activated carbon) or electrostatic precipitation to further improve the purification effect.

Storage of contaminants and waste oils after filtration

Pollutant Collection Method

Filter sludge retention: Solid particles (such as metal chips, dust) are captured by the filter material and accumulate in the filter cylinder or filter bag and need to be replaced or cleaned periodically.

Separation of sediment: Higher-density contaminants (e.g. moisture, heavy metals) may be deposited into the collection tank at the bottom of the system.

Waste oil storage: Separated waste oil is imported into a dedicated oil storage tank (usually equipped with a level sensor to prevent overflow).

Storage Design Points

Leakproof: The tank has a sealed design with corrosion-resistant materials (such as stainless steel or HDPE).

Automated discharge: High-end systems automatically discharge waste oil/contaminants to external containers via valve control.

Environmental treatment: Stored waste oils and pollutants must be returned to professional institutions for recycling (such as incineration, recycling).

Typical application scenarios

Industrial oil purification: extend the service life of hydraulic oil, cutting fluid.

Fuel treatment: Remove moisture and glue from diesel.

Wastewater treatment: separation of emulsified oil or heavy metals.

IV. Advantages and Precautions

Advantages: energy saving (reduced filter replacement frequency), high efficiency (can handle sub-micron particles).

Note: The ultrasonic parameters must match the liquid properties to avoid excessive cavitation damage to the equipment.