Sewage (Wastewater) Treatment Filters

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Packaging & Delivery

Product Description

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Brand: lanyao

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Product Description

Sewage (Wastewater) Treatment Filters – Overview and Common Types

Sewage-treatment filters are units that remove suspended solids, colloids, part of the organic load and bacteria from wastewater by physical (and sometimes chemical or biological) mechanisms. They are used for preliminary, advanced or reuse-grade polishing in both municipal and industrial plants. Main categories are described below.

1. Screens / Micro-strainers

Drum or band screens with 0.1–3 mm openings retain coarse floating matter.

2. Media filters

- Gravity sand, anthracite or multi-layer beds – suitable for settled effluent (SS < 50 mg L⁻¹).

- Pressure sand or activated-carbon filters – steel pressure vessels (0.3–1.0 MPa) save space and can polish turbidity, taste and COD sequentially.

3. Continuous back-wash sand filters (moving-bed)

Dirty sand is air-lifted, washed and returned; 24 h uninterrupted operation for high-SS streams.

4. Fibre-ball / fibre-bundle filters

High porosity and variable pore size allow 20–40 m h⁻¹ filtration velocity; often applied as side-stream filters or before RO.

5. Membrane filtration

- Microfiltration (MF) 0.1–1 µm – removes turbidity and algae.

- Ultrafiltration (UF) 0.01–0.1 µm – rejects colloids, bacteria and macromolecules.

- Nanofiltration / Reverse osmosis (NF/RO) – desalination, hardness and heavy-metal removal for reuse or stringent discharge.

6. Bio-filters

Trickling or aerated bio-filters (BAF) combine biodegradation and solids capture for high-COD effluents.

7. Automatic self-cleaning screen filters

Stainless woven mesh (20–200 µm) with suction or brush cleaning, triggered by ΔP/time, < 1 % back-wash water; widely used for steel casting, power-plant circuits and drip irrigation.

Modern filters integrate automatic back-washing, VFD constant-pressure control and on-line monitoring, reducing labour and water loss while protecting downstream membranes or biological stages. Selection should consider influent SS, particle-size distribution, flow-rate, target effluent quality and footprint.