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A Walnut Shell Filter is a deep-bed pressure filtration system specifically engineered for the removal of oil and suspended solids from water. Unlike traditional multi-media filters, it utilizes crushed black walnut shells as the filter medium. This natural material is uniquely "hydrophilic and oleophobic"—it attracts water while repelling oil—allowing for high-speed filtration and easy backwashing without media clumping. As a specialized China Walnut Shell Filter manufacturer, Qingdao Yimei provides robust systems designed to meet the rigorous demands of oily water reinjection and industrial discharge standards.
Depending on the automation requirements and oil concentration, we offer two primary configurations:
Vertical Pressure Walnut Shell Filters: The most common design for onshore oil fields and industrial plants, providing high filtration flux in a compact footprint.
Horizontal Deep-Bed Filters: Engineered for large-scale water treatment facilities where higher flow rates and longer contact times are required for ultra-polished effluent.
Automated Backwash Systems: Featuring high-shear agitators or external scrubbers to ensure the oily contaminants are completely stripped from the media during the cleaning cycle.
Qingdao Yimei’s industrial walnut shell filters are built to outperform standard media filters through superior mechanical design:
High Oil Adsorption Capacity: Our systems can handle influent oil concentrations of up to 50–100 mg/L, reducing them to less than 5 mg/L in a single pass.
Superior Backwash Efficiency: Equipped with a high-power internal agitator, our design ensures the walnut shell media is thoroughly cleaned, preventing the "mud-balling" effect common in inferior systems.
Durable Internal Components: We use high-grade SUS304/316 stainless steel for internal distributors and wedge-wire laterals to prevent media loss and ensure a long lifespan of over 15 years.
Low Operating Costs: The walnut shell media is physically hard and chemically stable, requiring minimal annual makeup (typically less than 5% loss) and no chemical surfactants for backwashing.
PLC-Controlled Intelligence: Fully automated sequences for filtration, agitation, and backwashing ensure stable operation with minimal operator oversight.
While other filters clog, our industrial walnut shell filters excel in these challenging environments:
Oil & Gas Produced Water: Crucial for treating produced water for reservoir reinjection, ensuring the protection of sensitive geological formations from plugging.
Steel & Metallurgical Plants: Removing cooling oils and mill scale from recycled process water in rolling mills and continuous casting lines.
Machinery & Parts Washing: Clarifying detergent-rich oily wastewater for closed-loop recycling, significantly reducing disposal costs.
Refinery Effluent Polishing: Acting as a final guard filter after DAF units to meet stringent environmental discharge permits.
Selecting Qingdao Yimei means securing a partner who understands the complexities of heavy-duty filtration.
Direct Engineering & Manufacturing: We produce all pressure vessels in our 36,000m² facility. This direct control allows us to offer a highly competitive walnut shell filter price while ensuring ASME/ISO quality standards.
Specialized Media Sourcing: We don't just provide the tank; we provide high-quality, high-density black walnut shell media specifically graded for industrial water treatment.
Custom Skid-Mounted Solutions: We offer fully integrated, skid-mounted systems (including pumps, valves, and controls) that are factory-tested and ready for immediate on-site connection.
Expert Field Service: With experience in 120+ countries, our technical team provides deep-dive water analysis and on-site commissioning to ensure your oil-removal targets are hit from day one.
Solve your oily wastewater challenges with the industry's most reliable filtration technology. Contact Qingdao Yimei today for a technical proposal and a customized Walnut Shell Filter price quote.
