SINOKLE Walnut-Shell Filter: Key Product Advantages
The SINOKLE walnut-shell filter is a new-generation high-efficiency oily wastewater filtration device independently developed by SINOKLE (Shenzhen) Technology Co., Ltd. It adopts naturally modified walnut-shell media and integrates core technologies such as deep-bed filtration structure, enhanced regenerative backwashing, anti-clogging water-distribution design, and intelligent control. It overcomes the pain points of conventional filters—low oil-removal efficiency, easy hardening and clogging, difficult regeneration, and high O&M costs—and delivers performance at the advanced industry level. Widely used in oilfield produced water, refinery oily wastewater, chemical wastewater, steel and metallurgy wastewater, circulating cooling water, and reclaimed-water reuse, it is a core unit for the deep purification and quality assurance of industrial oily wastewater. Its key advantages are as follows:
Naturally modified walnut-shell media with strong oil-removal capability and high filtration precision
It uses specially activated and modified natural walnut-shell media featuring a porous honeycomb structure and an extra-large specific surface area (800–1200 m²/g) with strong oleophilic and hydrophobic properties. Through the dual action of physical interception and chemical adsorption, it efficiently captures dispersed oil, emulsified oil, and fine suspended solids above 5 µm in water. Oil-removal efficiency for oily wastewater can reach 92%–97%, with stable effluent oil content ≤5 mg/L and suspended solids ≤3 mg/L—far surpassing conventional sand filters. This thoroughly solves the industry-wide challenge of “oil hard to remove, turbidity hard to reduce” in oily wastewater and provides high-quality influent for downstream processes.
Three-dimensional deep-bed filtration with large dirt-holding capacity and long filtration cycles
The innovative deep-bed graded filter-layer design features media graded naturally from coarse (top) to fine (bottom). Water flows top-down, forming a three-dimensional filtration system of “coarse filtration at the surface, deep filtration in the middle, and fine filtration in the inner layer,” so pollutants are evenly distributed throughout the bed and local surface clogging is avoided. Dirt-holding capacity reaches 2–3 times that of conventional sand filters, and a single filtration cycle can last 12–24 hours, greatly reducing backwash frequency. This effectively solves the conventional-equipment pain points of rapid head-loss, short cycles, and frequent shutdowns for backwashing, and suits the long-term stable operation of complex high-oil, high-suspended-solids water quality.
Elastic filter bed resists hardening, with good regeneration and long media life
Walnut-shell media is tough, highly elastic, and pressure- and wear-resistant. During filtration it compacts into a precise filter layer; during backwashing it loosens and rebounds to a fluffy state—without hardening, caking, or oil sticking—completely eliminating the hardening-failure problem of conventional media. Its natural oleophilic-hydrophobic property makes oil adsorption firm yet easy to strip during backwashing. Combined with a dedicated regeneration process, media regeneration efficiency exceeds 95%, with no performance decay over long-term operation. The media is wear- and corrosion-resistant and not prone to deformation, with a service life of 5–8 years—more than twice that of ordinary sand filters—greatly reducing consumable replacement costs.
Enhanced air-water backwashing for thorough regeneration, water saving, and low energy use
It is equipped with combined air-water backwashing plus mechanical-disturbance regeneration technology. Through the triple action of air-flow shearing, water-flow scouring, and media friction, it rapidly strips away oil, suspended solids, and other foulants retained on the media surface, achieving thorough, residue-free backwashing. Backwash is short (5–10 min) and uses little water (only 3%–5% of produced water)—over 40% water savings versus conventional filters. With no high-power rotating parts, operating energy consumption is low; together with long filtration cycles, this greatly reduces long-term energy and chemical costs, realizing energy saving, consumption reduction, and eco-friendliness.
Compact structure with small footprint and flexible skid-mounted deployment
The unit adopts a vertical cylindrical compact structure. Its internal water-distribution and collection systems use a patented anti-clogging labyrinth design with no complex redundant components, occupying only 1/2–2/3 of the footprint of conventional sand filters and requiring no large-scale civil works. It supports standardized skid-mounted integrated design: complete assembly, commissioning, and media loading are finished before delivery, so on-site only pipe and power connections are needed for rapid start-up—cutting installation time by over 60%. It suits space-constrained sites, retrofit of old projects, and mobile treatment stations, flexibly adapting to different treatment capacities (5–200 m³/h).
Corrosion-resistant durable materials suit complex water quality with stable operation
The main unit is built from anti-corrosion carbon steel (rubber-lined / epoxy-coated) or 304/316L stainless steel—corrosion-resistant, anti-aging, and high-strength—and can withstand corrosive media such as acids, alkalis, salts, and organic solvents in industrial wastewater, suiting the complex corrosive-water conditions of oilfield, refinery, and chemical industries. Internal distributors and collectors use stainless steel or high-strength ABS, resisting deformation and damage, with no leakage or failure over long-term operation. The overall equipment service life can exceed 15 years, ensuring long-term safe and stable system operation.
Fully automatic intelligent control for unattended, easy O&M
It is equipped with a PLC fully-automatic control system plus on-line pressure / flow / water-quality monitoring instruments that can monitor in real time parameters such as inlet/outlet pressure, differential pressure, flow, turbidity, and oil content, and automatically complete the full process of filtration, backwash, forward wash, and drain—requiring no manual attendance and supporting remote monitoring and parameter adjustment. It features over-limit differential-pressure, fault-alarm, and automatic shut-down protection to avoid misoperation and equipment damage. With no wearing parts, daily work is limited to periodic differential-pressure monitoring and simple maintenance, giving low O&M workload and labor cost and meeting industrial intelligent-management needs.
Wide applicability with extensive proven cases and reliable performance
The technology is mature and highly adaptable: it can be used alone for deep oil and turbidity removal from industrial oily wastewater, reclaimed-water reuse pre-treatment, and side-stream filtration of circulating water, or connected in series with hydrocyclones, coalescers, dissolved-air flotation units, and precision filters to form an integrated treatment system. It has been widely applied across petrochemical, refining, oilfield, chemical, steel, and metallurgy industries, with numerous projects achieving stable long-term compliance. Its performance is fully proven in practice, with outstanding technical reliability and economy, meeting the effluent requirements of different industries and standards.
Summary
With naturally modified walnut-shell media, deep-bed filtration, elastic anti-hardening, enhanced regeneration, and intelligent control as its core advantages, the SINOKLE walnut-shell filter comprehensively breaks through the bottlenecks of conventional filtration equipment—poor oil removal, easy hardening, difficult regeneration, high water consumption, and complex O&M. Featuring high filtration precision, large dirt-holding capacity, long filtration cycles, water-saving low consumption, compact skid-mounting, and long-life maintenance-free operation, it both efficiently removes trace oil and fine suspended solids to ensure stable compliant effluent and greatly reduces capital and operating costs. It suits the deep-purification needs of complex water quality across multiple industries and is the preferred core equipment for high-efficiency filtration and green, low-carbon treatment of industrial oily wastewater, providing reliable support for stable compliance across the entire industrial water-treatment process.
