Inclined Screen Filter
Wastewater from aquaculture, slaughterhouses, starch production, papermaking, and other industries often contains large amounts of coarse suspended solids, fibers, and debris. If such wastewater directly enters biological treatment or fine filtration equipment, it can easily clog screens, accumulate sludge, and increase chemical consumption. The inclined screen filter uses a single inclined stainless steel screen to efficiently separate large particulate solids from liquid by gravity flow—simple in structure, virtually no power consumption, and high capacity per unit—making it a classic first choice for front-end pretreatment and solid-liquid separation.
I. Product Positioning
The inclined screen filter (also known as inclined screen, curved screen/vibrating screen) is a type of statically inclined screening solid-liquid separation equipment. Wastewater flows from top to bottom along the inclined screen surface; liquid passes through the screen while solids are retained and slide down the incline for discharge. The entire process is primarily gravity-driven, with an optional vibration motor for anti-clogging. It does not perform fine purification tasks, but serves as the first "load reduction" step for high-solids, high-flow wastewater—removing most coarse debris, fibers, and particles first, significantly reducing the load and wear on downstream sedimentation, DAF, microfiltration, or biological treatment. The main body is made of 304/316L stainless steel, offering corrosion resistance and long service life. It can be floor-mounted or elevated on a steel frame.
II. Working Principle (Text Steps)
Inlet distribution: Incoming water is evenly distributed onto the upper end of the screen surface via a distributor or weir trough, spreading across the entire screen width to avoid channeling and impact.
Gravity filtration: Liquid passes downward through the screen slots/openings by its own weight, while coarse particles, fibers, and debris are retained on the screen surface—no pressure, no chemicals (in most cases).
Solids sliding: Retained solids continuously slide and collect toward the lower end along the inclined screen surface under gravity and (for vibrating models) micro-vibration.
Filtrate collection: Filtrate passing through the screen collects in the lower collection tank and is directed to downstream treatment units via the outlet.
Sludge discharge: Solids collected at the lower end of the screen fall into a discharge chute/receiving hopper for off-site transport or further dewatering.
Continuous operation: Inlet—separation—discharge—collection cycles continuously. Vibrating models use timed/continuous micro-vibration to shake off attached material, maintaining screen permeability and stable flux.
Process description: The entire separation is completed continuously on a single inclined screen surface. The core is "gravity through-screen + inclined discharge," which differs from the "rotary drum + backwash" mechanism of rotary drum microfiltration (e.g., Fajiesi). The inclined screen is more suited for coarse screening and high-flow pretreatment.
III. Core Advantages
Virtually no power consumption Static inclined screens require no power; only vibrating models use a small motor, resulting in extremely low energy consumption.
High flow, high throughput Wide screen surface and gravity flow allow a single unit to handle from several to hundreds of m³/h of high-solids wastewater.
Chemical-free in most cases Pure physical screening removes coarse debris without flocculants, reducing chemical and sludge costs.
Extremely simple structure, easy maintenance No complex transmission or high-pressure components; screens can be quickly removed for cleaning or replacement.
Small footprint, flexible layout Compact and modular; can be floor-mounted, on steel frames, or elevated over tanks, suitable for retrofits and new builds.
Protects downstream equipment Removing coarse debris and fibers upfront significantly reduces clogging and wear on downstream sedimentation/DAF/microfiltration/pumps.
IV. Main Technical Parameters (Typical Range Reference)
Item | Typical Range (depending on water quality and model) |
|---|---|
Screen material | 304/316L stainless steel (wedge wire or woven mesh) |
Screen slot/aperture | Slot 0.25–2 mm; woven mesh 80–1000 μm (selected by material particle size) |
Installation angle | 45°–60° (commonly 50°–55°) |
Single unit capacity | From several m³/h to hundreds of m³/h (varies with screen width and aperture) |
Applicable influent SS | Can tolerate high solids; stable operation even with thousands of mg/L coarse-particle wastewater |
Suspended solids removal | Approximately 30–70% removal of coarse/fibrous suspended solids (depending on material and aperture) |
Drive mode | Static gravity type (no power) / vibrating type (vibration motor for anti-clogging) |
Installed power | Static type ≈0; vibrating type approx. 0.1–0.75 kW |
Head loss | Minimal (gravity flow, no additional lifting required) |
Discharged sludge moisture | Relatively high; usually requires downstream dewatering equipment for further volume reduction |
Note: The above are typical range references. Actual screen slot, angle, throughput, and removal rate must be determined based on wastewater solids content, particle size, and site conditions.
V. Typical Application Scenarios
Scenario | Description |
|---|---|
Aquaculture wastewater | Pig farm, poultry, and dairy manure and flushing water; initial screening of manure and bedding. |
Slaughter and meat processing | Primary separation of meat fragments, fats, hair, and blood water debris. |
Starch / sugar / brewing | Recovery and volume reduction of large organic solids such as potato residue, sugar residue, and distiller's grains. |
Papermaking and waste paper pulping | Recovery and screening of pulp fibers, fillers, and white water. |
Fruit and vegetable processing / juice | Coarse screening separation of peel, pulp fragments, and processing wastewater. |
Municipal fecal sludge / biogas slurry | Pre-solid-liquid separation of biogas slurry and fecal sludge to reduce downstream load. |
Food fermentation | Preliminary filtration and recovery of solids-containing materials such as fermentation mash and microbial residue. |
VI. Applicable Boundaries and Selection Recommendations
Applicable boundaries: The inclined screen is a coarse/medium precision physical screening device, skilled at removing millimeter to hundred-micron coarse particles, fibers, and large debris; it is essentially ineffective for fine colloids, dissolved COD, nitrogen, and phosphorus, and is not suitable for low-solids or fine purification requirements. If downstream requires fine suspended solids to meet standards, it should be followed by fine filtration (e.g., Fajiesi rotary microfiltration, sand filtration) or sedimentation/DAF.
Selection recommendations: ① For high-fiber, sticky materials, prefer wedge wire screens to resist winding and clogging; ② When fine particles dominate, reduce screen slot or switch to woven mesh, but balance throughput; ③ For high-solids, screen-blinding conditions, choose vibrating type for anti-clogging; ④ Calculate angle and screen width based on water and solids flow to ensure smooth discharge; ⑤ Discharged sludge has high moisture; pair with screw press/dewatering equipment; ⑥ Select 304 or 316L material based on corrosivity.
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FAQ
How much does this equipment cost?
The price varies by treatment capacity, water quality, materials and configuration, so a custom quote is provided based on your actual conditions. We offer free water testing and solution design, with a detailed quote within 1 working day after requirements are confirmed.
What treatment capacity is available? Can it be customized?
Capacity is fully customizable, ranging from tens to thousands of tons per day (e.g. 0.5–30 m³/h), with non-standard design support matched precisely to your inlet/outlet requirements.
How long does delivery take?
Standard equipment typically takes about 2–4 weeks to produce; custom projects depend on scale and process. The delivery date is confirmed at contract signing, with design, manufacturing and shipping progressing on schedule.
Is installation and commissioning included?
Yes. We provide installation, system commissioning, operator training and environmental acceptance assistance, as well as long-term managed operation services on request.
What about after-sales and warranty?
We provide a warranty period and a 24/7 technical hotline, with free repair for non-human faults during the warranty period, plus spare parts supply and regular inspection services.
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