Microscreen Filter
In wastewater upgrading, reclaimed water reuse, and water plant purification, it is often necessary to stably intercept fine suspended solids in the 10–200 μm range—sand filtration requires a large footprint, and inclined screens lack sufficient precision. The rotating drum microscreen filter uses a rotating stainless steel filter mesh to achieve "inside-out filtration + outside-in automatic backwash" by hydraulic means. It operates continuously with extremely low water loss, making it an efficient choice for fine suspended solids polishing.
I. Product Positioning
The microscreen filter (rotating drum type, Rotating Drum Microscreen Filter) is a type of fine surface filtration equipment. The drum is enclosed by a 316L / 304 stainless steel microporous filter mesh. Influent enters from inside the drum, and as the drum rotates, water passes through the mesh from inside to outside, while suspended solids are intercepted on the inner surface of the mesh. The backwash system sprays from the outside to wash off and discharge the intercepted contaminants, with filtration and backwashing proceeding simultaneously and continuously. It does not perform biochemical functions; rather, it serves as a precision polishing unit for deep removal of fine suspended solids and water quality upgrading. It can be used independently for reclaimed water reuse and river/lake purification, or connected in series after sedimentation/air flotation for fine filtration.
II. Working Principle (Text Steps)
Influent distribution: Influent enters the interior of the drum through the distribution trough and is evenly distributed along the drum width to avoid biased flow impacting the filter mesh.
Inside-out filtration: As the drum rotates, water passes through the filter mesh from inside to outside by gravity head difference, and fine suspended solids are intercepted on the inner surface of the mesh.
Filtered effluent: Water that passes through the mesh collects in the water collection chamber of the equipment housing and is led out through the outlet to downstream processes or reuse points.
Automatic backwash: The backwash pump/nozzles spray from the outside of the drum inward to wash off intercepted contaminants, without requiring shutdown.
Sludge collection and discharge: The washed-off contaminants enter the discharge trough with the backwash water and are discharged from the system as concentrate/sludge.
Continuous operation: The drum rotates continuously, with filtration—backwash—discharge cycles proceeding, fully automatic throughout, without interrupting effluent flow.
Process description: The core is "drum rotation + inside-out filtration + outside-in backwash," which belongs to separation equipment of different precision and process stages compared with inclined screens (static gravity coarse screening) and grit-water separators (grit dewatering).
III. Core Advantages
High fine filtration precision Filtration pore size 10–200 μm, capable of stably intercepting fine suspended solids that are difficult for sand filtration to remove.
Continuous filtration without interruption Filtration and backwashing proceed simultaneously, no shutdown required, stable effluent.
Low water loss and low energy consumption Head loss can be as low as within 0.3 m, saving on operating electricity costs.
Compact footprint Integrated drum structure, can be directly installed above tanks or on the ground, retrofit-friendly.
Long filter mesh lifespan 316L stainless steel filter mesh is corrosion-resistant and acid-washing-free, with normal service life of several years.
Fully automatic with minimal maintenance PLC controls the drum and backwash; routine inspection is all that is needed, simple operation and maintenance.
IV. Main Technical Parameters (Typical Range Reference)
Item | Typical Range (depending on water quality and model) |
|---|---|
Filtration type | Rotating drum type (inside-out filtration + outside-in backwash) |
Filter mesh material | 316L / 304 stainless steel microporous filter mesh |
Filtration pore size | 10–200 μm (selected according to effluent requirements) |
Influent SS | Typically ≤40 mg/L (pre-sedimentation/inclined screen required if higher) |
Effluent suspended solids | Significantly reduced depending on pore size, can meet Grade 1A upgrading requirements |
Head loss | ≤0.3 m |
Single unit capacity | Tens to hundreds of m³/h (varies with drum diameter and pore size) |
Backwash method | Outside-in automatic backwash (backwash pump + nozzles) |
Installed power | Low (gear motor + backwash pump) |
Control method | PLC automatic control, protection rating IP65 |
Note: The above are typical range references. Actual pore size, flux, and effluent indicators must be determined based on influent SS, target effluent, and site conditions.
V. Typical Application Scenarios
Scenario | Description |
|---|---|
Wastewater plant upgrading | Fine suspended solids polishing for upgrading secondary effluent from Grade 1B to Grade 1A. |
Reclaimed water reuse | Advanced filtration before reuse to ensure stable reclaimed water quality. |
Industrial wastewater pretreatment | Fine suspended solids removal before biochemical treatment of high-concentration wastewater, protecting downstream membranes/biochemical processes. |
Water supply / tap water | Pretreatment fine filtration of surface water sources, reducing load on subsequent processes. |
Rivers/lakes / landscape water | Bypass filtration for water body circulation purification, algae and suspended solids removal. |
Aquaculture / slaughterhouse | Further fine filtration of fine suspended solids after coarse screening by inclined screens. |
Rainwater reuse | Purification and reuse filtration after initial rainwater diversion. |
VI. Applicable Boundaries and Selection Recommendations
Applicable boundaries: The microscreen filter is a purely physical surface fine filtration device, skilled at intercepting fine suspended solids in the 10–200 μm range; it is essentially ineffective for dissolved COD, nitrogen, and phosphorus. Influent containing dissolved pollutants requires upstream biochemical/advanced treatment. Excessively high influent SS will accelerate mesh clogging and increase backwash volume, so pre-sedimentation or inclined screens should be provided upstream.
Selection recommendations: ① Select pore size according to target effluent (finer pore size gives higher precision but lower flux); ② When influent SS is high or contains fibers, first use inclined screens/sedimentation for pre-screening before entering the microscreen filter; ③ Select 304 or 316L material based on corrosivity; ④ For large treatment capacities, select larger drum diameters or multiple units in parallel.
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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.
Use one microscreen filter to reliably capture fine suspended solids
Rihong Environmental provides specification selection, pore size matching, and complete fine filtration layout solutions for rotating drum microscreen filters. Tell us your flow rate, influent SS, and target effluent, and we will match the most suitable pore size and model for you.
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