Multimedia Filtration MMF
Multi-layer depth filtration of suspended solids. Layered anthracite–sand–garnet beds that strain residual suspended solids and oil to protect membranes and ion exchange downstream.
System Schematic
Representative process-flow — configured to your streamUnderlying Technology & Scientific Principle
Multimedia (or dual-media) filtration uses a graded bed of materials of decreasing size and increasing density — anthracite over sand over garnet/gravel — so particles are captured in depth: large solids high in the coarse anthracite, fine particles deeper, maximising dirt-holding capacity versus a single-media filter.
Working Mechanism
Water passes down through the bed where solids are removed by straining, interception, sedimentation and adsorption onto media grains. As head-loss rises with captured solids, the bed is periodically backwashed (often with air scour) to fluidise the media, release the trapped solids and re-stratify the layers.
Separation / Removal Efficiency
Removes suspended solids to 5–10 µm nominal, typically achieving effluent TSS <5 mg/L and turbidity <1 NTU; with coagulant addition, fine colloids and residual oil are further reduced.
Operating Principle & Parameters
Filtration rate 10–30 m/h; backwash 30–50 m/h with air scour. Bed depth 0.8–1.5 m. Cycle length set by influent solids load and terminal head-loss.
Flow Rates & Volumetric Capacities
Vertical or horizontal pressure vessels from 5 to several hundred m³/h; multiple vessels in parallel for continuous service during backwash.
Fluid Media Compatibility
Anthracite, silica sand, garnet and support gravel in CS-lined or FRP vessels. Tolerant of saline and warm water; oil fouling must be controlled upstream.
System Schematic & Process Integration
Classic pre-treatment ahead of UF/RO and ion exchange, downstream of clarification or flotation; also tertiary polishing of biologically treated effluent.
Options / Variations Available
Pressure vs. gravity; dual- or tri-media; coagulant-assisted (in-line) filtration; automatic vs. manual backwash valving.
System Complexity & Automation Level
Moderate — automatic backwash on differential pressure, time or turbidity; valve nests sequenced by PLC. Robust and low-skill operation.
Applications & Performance Delivered
RO / UF pre-treatment
Reduces SDI and TSS to protect membranes and extend life.
Cooling-water side-stream filtration
Controls suspended solids and fouling in recirculating systems.
Tertiary effluent polishing
Clarifies biologically treated water before discharge or reuse.
Contaminant Removal Profile
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