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Multi-media filter
Brief Introduction
I. Product Overview Multi-media filtration is one of the most effective methods for removing suspended solids from water. Typically serving as a pretreatment stage in water treatment systems, it primarily relies on filter media to intercept and adsorb sediment, colloids, metal ions, and organic matter, thereby eliminating impurities such as suspended solids, colloids, mud, and rust. Widely used in both water purification and wastewater treatment, multi-media filtration is favored for being pollution-free, cost-effective, and low in operational expenses. Common filter materials include stainless steel 304 and carbon steel, usually with internal epoxy or rubber lining for corrosion protection. For the water distribution system, upper distribution typically employs bell-mouth or basket-type configurations, while lower distribution includes flat plate, dome plate, or stainless steel pipe arrangements. Distribution nozzles come in two types: ABS mushroom heads and stainless steel cylindrical wire-wound nozzles. To accommodate backwashing requirements for quartz sand filters, the distributor's flow capacity is generally designed at three times the operational flow rate. II. Technical Features 1. Unique multi-chamber structure enables online backwashing (simultaneous filtration, drainage, and backwashing). 2. Tank material can be selected based on system water pressure, including carbon steel, stainless steel, and fiberglass-reinforced plastic (FRP). III. Technical Parameters 1. Treatment Efficiency ① Influent turbidity: <20 FTU; Effluent turbidity: <3 FTU ② Dirt-holding capacity: 5–15 kg/m3 (filter media) 2. Operating Environmental Parameters ① Operating temperature: 5–60°C (customizable for special temperatures) ② Operating pressure: ≤0.6 MPa ③ Inlet water pressure: ≥0.04 MPa ④ Backwash inlet pressure: ≥0.15 MPa ⑤ Inlet-outlet pressure differential: 0.01–0.015 MPa 3. Operational Parameters ① Operation mode: Pressure type ② Flow direction: Top-down ③ Filtration velocity: 8–12 m/h (up to 15 m/h maximum) ④ Operation cycle: 2–7 days ⑤ Backwash method: Water wash or air-water combined backwash ⑥ Backwash water consumption rate: 1–3% ⑦ Backwash intensity: 4–15 L/s·m2 ⑧ Backwash duration: 5–7 minutes ⑨ Bed expansion rate during backwash: 40–50% |
