NSF - Nut Shell Filtration

Nut Shell Filtration, combined with advanced separation technology, provides a safe and reliable oil-water treatment solution suitable for stable operations.

How It Works

Nut Shell Filtration is a high-efficiency oil removal filtration device that uses specially treated walnut shell granules as the core filter media. Leveraging its porous structure and surface characteristics, it achieves deep purification of oily wastewater. Its core advantages include a high oil removal rate (82%-93%), strong oil resistance, good regenerability, and a long service life (3-5 years). It is widely used in oily wastewater treatment fields such as oilfield produced water reinjection, petrochemical wastewater, and metallurgical industry applications, serving as a key fine filtration unit in ORF (Oil Removal Facility) systems.

Nut Shell Filtration employs a unique "physical-chemical dual-effect filtration" mode, achieving high-efficiency oil removal through three core mechanisms:

Surface Adsorption:

The natural honeycomb pore structure of walnut shells (with a porosity of 60%-70%) creates a huge specific surface area. The surface area of a single gram of filter media reaches 5-8 m², which is 3-5 times that of quartz sand, enabling strong adsorption of oil and suspended solids.

Mechanical Interception:

The gaps between filter media particles (typically 2-3mm) form a precision screen that effectively intercepts impurities larger than 20 microns, creating a multi-stage filtration barrier.

Oil Droplet Coalescence and Separation:

Oil droplets exhibit hydrophobic agglomeration on the filter media surface, forming an oil film. This film is then washed away by the shear force of water flow through the pore spaces, forming coarse oil droplets that rise and separate.

During the filtration process, water flows from top to bottom through the water distributor, the filter media layer, and the water collector to complete purification. During backwashing, an agitator tumbles the filter media, and water flows from bottom to top, restoring more than 90% of the filtration capacity within 30 minutes.

The equipment features a freely movable design to meet the application requirements of different sites.

All equipment undergoes comprehensive shop testing to ensure it meets quality requirements and guarantees complete reliability.

Product Features

Internal backwash technology
Variable internal media technology
Compact structure with high-efficiency oil removal

Downloads: NSF - Nut Shell Filtration Datasheet (PDF)