Dolphin Centrifuge supplies disc stack centrifuges (up to 12,000 Gs, 1-micron separation) for wastewater under 10% solids and decanter centrifuges (up to 4,000 RPM) for high-sludge streams over 10% solids — serving semiconductor, food processing, battery manufacturing, and municipal applications.
Overview
Industrial wastewater centrifuges fall into two broad categories based on the solids content of the waste stream. The correct choice depends on whether the wastewater has low sludge (under 10% solids) or high sludge (over 10% solids). Each type has distinct operating principles, G-force ranges, and ideal applications.
- Disc Stack Centrifuges — for wastewater with less than 10% solids. High-speed separators that remove particles down to 1 micron and separate oils. G-forces up to 12,000 Gs.
- Decanter Centrifuges — for wastewater with greater than 10% solids. High-volume, continuous sludge dewatering machines that produce a dry cake and clarified effluent.
Disc Stack Centrifuges for Low-Sludge Wastewater
Disc stack centrifuges are the preferred technology when the wastewater contains less than approximately 10% solids by volume. These machines spin at extremely high speeds, generating centrifugal forces up to 12,000 Gs. At these forces, particles as small as 1 micron are separated from the liquid phase, and any free oil is simultaneously removed via a separate discharge.
Self-cleaning disc stack models periodically eject accumulated sludge from the bowl automatically, allowing continuous, unattended operation. The following real-world examples illustrate how disc stack centrifuges handle different wastewater streams.
1. Silica Grinding Wastewater (Semiconductor Industry)
Silicon wafer manufacturing generates grinding slurry wastewater containing fine silica particles. A DMPX-070 disc stack centrifuge handles this application by clarifying the grinding water for reuse, dramatically reducing both water consumption and disposal costs.
| Specification | DMPX-070 |
|---|---|
| Motor Power | 25 HP |
| Capacity | 50 GPM @ 5% solids |
| Bowl Speed | 5,000 RPM |
| Wetted Material | 316L Stainless Steel |
| Dimensions (L × W × H) | 7′ × 6′ × 7′ |
2. Oily Wastewater (Food Processing)
Food processing plants produce oily wastewater that must be treated before discharge. A 20 GPM self-cleaning disc stack centrifuge simultaneously removes suspended solids and separates free oil from the water phase in a single pass. The three-phase separation eliminates the need for separate oil skimmers and settling tanks.
| Specification | Self-Cleaning Disc Stack |
|---|---|
| Motor Power | 10 HP |
| Capacity | 20 GPM |
| Bowl Speed | 7,800 RPM |
| Wetted Material | 316L Stainless Steel |
| Dimensions (L × W × H) | 6′ × 4′ × 5′ |
3. Battery Manufacturing Wastewater
Battery manufacturing generates chemical-laden wastewater with fine metallic particles and dissolved contaminants. A DMPX-028 disc stack centrifuge provides the high G-force needed to separate these fine particles, producing clean water suitable for recycling back into the production process.
| Specification | DMPX-028 |
|---|---|
| Motor Power | 10 HP |
| Capacity | 20 GPM @ 5% solids |
| Bowl Speed | 7,800 RPM |
| Wetted Material | 316L Stainless Steel |
| Dimensions (L × W × H) | 5′ × 5′ × 6′ |
Need Help Choosing the Right Wastewater Centrifuge?
Our engineers will evaluate your wastewater stream and recommend the optimal centrifuge type and configuration.
Decanter Centrifuges for High-Sludge Wastewater
When wastewater contains more than 10% solids, a decanter centrifuge is the appropriate choice. Decanters are designed for high-volume, continuous processing of heavy sludge. An internal scroll conveyor transports the separated solids to the discharge end while clarified liquid overflows at the opposite end.
Decanters excel at municipal biosolids dewatering, mining tailings, food processing waste, and any application where the waste stream has a significant solids load. They produce a stackable cake that is far cheaper to haul and dispose of than liquid sludge.
Available Decanter Models
| Specification | NX-314 | NX-418 | Sharples P-3000 |
|---|---|---|---|
| Motor Power | 15 HP | 25 HP | 20 HP |
| Capacity | 40 GPM @ 15% solids | 80 GPM @ 15% solids | 40 GPM @ 15% solids |
| Bowl Speed | 4,000 RPM | 4,000 RPM | 3,250 RPM |
| Scroll Torque | 2.5 kNM | 2.5 kNM | 2.5 kNM |
| Dimensions (L × W × H) | 7′ × 3′ × 5′ | 10′ × 4′ × 5′ | 8′ × 6′ × 6′ |
Choosing the Right Wastewater Centrifuge
The single most important factor is solids concentration. Wastewater with low solids content (under 10%) and fine particles benefits from the extreme G-forces of a disc stack centrifuge. Wastewater with heavy sludge loads (over 10%) requires the high-throughput solids handling of a decanter.
If the waste stream contains both oil and solids, a three-phase disc stack centrifuge can separate oil, water, and solids simultaneously. For extremely heavy sludge combined with an oily water phase, a two-stage approach — decanter followed by disc stack polishing — delivers the best results.
Contact us at (248) 522-2573 or sales@dolphincentrifuge.com with your wastewater analysis and flow rates for a no-cost equipment recommendation.
Frequently Asked Questions
What types of wastewater centrifuges are available? ▼
Two main types of industrial centrifuges handle wastewater: disc stack centrifuges for wastewater with less than 10% solids (generating up to 12,000 Gs for sub-micron particle removal), and decanter centrifuges for wastewater with more than 10% solids (producing dry sludge cake with continuous scroll discharge).
When should I use a disc stack centrifuge for wastewater? ▼
Use a disc stack centrifuge when your wastewater contains less than 10% solids by volume and requires fine particle removal down to 1 micron. Disc stack centrifuges are ideal for semiconductor wastewater, oily wastewater requiring oil-water-solids separation, and battery manufacturing wastewater with fine metallic particles.
When should I use a decanter centrifuge for wastewater? ▼
Use a decanter centrifuge when your wastewater contains more than 10% solids and you need high-volume continuous sludge dewatering. Decanters excel at municipal biosolids, mining tailings, food processing waste, and any application producing a stackable dry cake for cheaper hauling and disposal.
Can a centrifuge separate oil from wastewater? ▼
Yes. A three-phase disc stack centrifuge simultaneously separates oil, water, and solids from oily wastewater in a single pass. For extremely heavy sludge combined with an oily water phase, a two-stage approach using a decanter followed by disc stack polishing delivers the best results.
Can I test my wastewater before purchasing a centrifuge system? ▼
Yes. Dolphin Centrifuge offers a pilot sample testing program. Send us a sample of your wastewater and we will process it through our in-house lab centrifuge, delivering a full separation report including particle removal rates, recommended model, and estimated throughput. Testing eliminates uncertainty before capital commitment.
Related resources: Wastewater Centrifuge Overview | Silica Wastewater Case Study | Dewatering Centrifuge Guide | Manure Centrifuge Separator | Industrial Washer Fluid Centrifuge | Decanter Centrifuge | Disc Stack Centrifuge | Sample Testing Program | Decanter vs Disc Centrifuge | Centrifuge FAQ (101 Questions)