Overview
The CG Mechanical Filter™ is a pressure-driven multimedia filtration system for tertiary polishing of biologically treated effluent, drinking water clarification, and industrial process water treatment. A layered bed of anthracite, sand, and garnet captures residual suspended solids and turbidity passing through secondary biological treatment, producing consistently low-turbidity effluent suitable for NEQS-compliant discharge, direct reuse, or further membrane treatment (UF/RO). The system operates automatically with timed or differential pressure-triggered backwash cycles using combined air scour and water flush, requiring minimal operator intervention.
Working Principle
Pre-treated water is pumped through the top of the filter vessel under pressure (0.5–3 bar) and flows downward through the layered media bed. Coarse anthracite in the upper layer captures large floc and suspended particles. The middle sand layer removes finer particles. The bottom garnet layer provides fine polishing. Suspended solids accumulate progressively until the differential pressure reaches the set trigger point. A pressure-triggered backwash cycle initiates: simultaneous air scour and upward water wash fluidise and clean the media, backwash water carries removed solids to a waste channel, and the media re-stratifies ready for the next filtration run.
Key Technical Features
- Anthracite-sand-garnet multi-media bed
- Effluent SS: <5 mg/L
- Effluent turbidity: <1 NTU
- Pressure vessel: FRP, mild steel epoxy, or SS304
- Operating pressure: 0.5–3 bar
- Automated air-water combined backwash
- Timer or differential pressure triggered backwash
- Flow rate: 10–500 m³/hr per vessel
- Single or parallel filter banks for continuous flow
- Suitable as pre-treatment before UF/RO membranes
- Media replacement interval: 5–10 years
Design Parameters
| Parameter | Value |
|---|---|
| Flow Range | 10–500 m³/hr/vessel |
| Media | Anthracite/Sand/Garnet |
| Effluent Turbidity | <1 NTU |
| Effluent SS | <5 mg/L |
| Operating Pressure | 0.5–3 bar |
| Vessel Material | FRP/MS Epoxy/SS |
| Backwash | Auto Air-Water |
| Media Life | 5–10 years |
Applications
- Tertiary polishing of SBR, MBR, BAF effluent
- Pre-treatment before UF or RO membranes
- Drinking water turbidity removal
- Industrial process water treatment
- Swimming pool and recreational water
- Cooling tower make-up water preparation
- Iron and manganese removal from groundwater
Advantages
- Removes residual turbidity to <1 NTU — enables reuse qualification
- Automated backwash — no operator-intensive cleaning
- Multi-media bed maximises filtration run length
- FRP vessel option — lightweight, corrosion-resistant
- Parallel vessels enable 100% uptime continuous filtration
- Pre-treatment for UF/RO extends membrane life significantly
Frequently Asked Questions
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