BC Coast Municipal WWTP: Centrifuge and Polymer Package Case Study
A HAUS DDE 3532 decanter with stainless cake conveyor, emulsion polymer unit and a BC-built control panel dewaters digested sludge at a municipal wastewater plant on the BC coast.
The application
A town on the BC coast tendered the supply of a new dewatering centrifuge in 2024 for the waste activated sludge leaving its aerobic digester.
Archer won the contract with a HAUS DDE 3532 from its Port Coquitlam stock, an emulsion polymer make-down unit, also in stock, a stainless screw conveyor and a control panel designed and built in BC. Keeping the centrifuge model and spare parts – including a complete rotating assembly – in stock lets the town turn round its annual maintenance quickly.
The equipment shipped in July 2025 and was commissioned with the installing contractor that summer. The panel logs process data every half second for troubleshooting.
What Archer supplied
- One HAUS DDE 3532 dual-drive decanter centrifuge (bowl 353 mm × 1,160 mm, 15 kW main drive, 7.5 kW back-drive, 3,150 N·m gearbox)
- Stainless steel centrate chutes and a stainless steel cake screw conveyor
- Kozegho Polyne 100 in-line emulsion polymer make-down system
- Stainless steel NEMA 4X control panel with PLC, touch screen and on-board data logging; option for a cellular router to Archer’s remote-monitoring server
- Spare rotating assembly (bowl, scroll, gearbox and bearing housings) for fast change-out
- Start-up, commissioning, operator training and performance optimization
Design basis
| Feed | Waste activated sludge after aerobic digestion |
|---|---|
| Feed flow | 5–7.2 m³/h |
| Feed solids | 0.9–3 % dry solids before polymer |
| Guarantee | Cake ≥ 18 % TS (passes the paint filter test), capture ≥ 95 %, polymer ≤ 24 kg/t DS |
| Bowl | 3,800 rpm (2,832 G), L/D 3.29, 15° cone |
Design figures from Archer proposal 24021301 (March 2024).
The installation in 3D
We model every installation in SolidWorks before anything is ordered, to check access, lifting and conveyor routes in the room.
- HAUS decanter centrifuge
- Main drive motor
- Concrete centrifuge plinths
- Stainless steel inclined cake screw conveyor
- Conveyor drive
- Conveyor support frame
- Cake bin
Related
- Decanter Centrifuges: hAUS decanters for sludge dewatering and process separation.
- Polymer Systems: dry and emulsion polymer make-down.
- Screw Conveyors: cake and bulk solids conveyors.
- Municipal Water and Wastewater: equipment for municipal treatment plants.
- Remote Monitoring: iIoT monitoring and remote support.
- All case studies: more Archer projects in the field.