Two Phase Decanter Centrifuge for Chemical Sludge Dewatering

The chemical sludge dewatering horizontal screw centrifuge is specially designed for continuous solid-liquid separation and sludge reduction in chemical wastewater treatment.

For most chemical sludge dewatering applications, a two-phase horizontal screw centrifuge is recommended, as the main separation target is usually solid sludge + clarified liquid.

• Electroplating sludge dewatering
• Dye and pigment wastewater sludge treatment
• Pharmaceutical chemical sludge dewatering
• Pesticide and fine chemical wastewater sludge treatment
• Daily chemical and cosmetics emulsified sludge dewatering
• Power plant FGD wastewater sludge dewatering
• Chemical precipitation sludge treatment
• Heavy metal floc separation 

Typical materials include chemical precipitated solids, emulsified flocs, heavy metal hydroxide flocs, high-salinity inorganic sludge, gypsum-based precipitates, suspended solids, flocculated sludge, and wastewater liquid phase.

• The main goal is to separate solid sludge from liquid wastewater.
• Most chemical sludge contains precipitated solids, flocs, salts, and heavy metal compounds, not a clearly separable oil phase.
• A two-phase decanter provides continuous dewatering with a simpler structure, stable operation, and lower operating complexity.

• If the sludge contains recoverable oil or solvent.
• If the process requires separation of light liquid, heavy liquid, and solids at the same time.
• If the wastewater contains emulsified oil that needs pretreatment before centrifuge separation.

1. Chemical sludge enters the rotating bowl through the feed pipe.
2. Under centrifugal force, heavier solid particles and flocs move outward and form a sediment layer.
3. The screw conveyor continuously pushes the separated solids toward the discharge end.
4. The clarified liquid phase is discharged through the liquid outlet.
5. The discharged cake is collected for further drying, stabilization, disposal, or resource treatment.

• Continuous automatic operation
• Reduced sludge volume and disposal cost
• Stable separation of chemical precipitated sludge and heavy metal flocs
• Lower suspended solids in the liquid phase
• Compact footprint compared with some traditional dewatering systems
• Flexible material options for corrosive wastewater
• Wear and corrosion protection can be customized according to sludge composition
• Suitable for high-salinity and chemically complex wastewater sludge after proper pretreatment

With proper pretreatment and chemical dosing, the Chemical Sludge Dewatering Decanter Centrifuge can typically achieve:

• 20–35% cake solids content
• 65–80% final cake moisture
• 85–95% solid capture rate
• 60–90% suspended solids reduction in separated liquid
• 30–60% sludge volume reduction
• 20–50% lower transport and disposal cost
• 16–24 hours/day continuous automatic operation

Actual results depend on sludge composition, pH, salinity, flocculation effect, feed stability, and operating settings. Pilot testing is recommended when the sludge composition varies significantly.

What is the difference between a two-phase and a three-phase decanter centrifuge?

A two-phase decanter separates solids and one liquid phase. A three-phase decanter separates solids, light liquid, and heavy liquid at the same time. For chemical sludge dewatering, a two-phase decanter is usually preferred because the main target is sludge-liquid separation.

Is polymer dosing required?

In many chemical sludge and fine solids applications, polymer dosing helps improve floc formation, separation efficiency, and cake discharge stability. The actual dosing requirement depends on sludge composition, pH, salinity, and target results.

What information is needed for model selection?

Please provide sludge source, capacity, solids content, pH, salinity, heavy metal content, chemical dosing condition, temperature, target cake dryness or liquid clarity, and operating hours.

Can this machine be made in stainless steel?

Yes. Common material options include SUS304, SUS316L, duplex stainless steel, and wear-protected parts. For highly corrosive chemical sludge, material selection should be confirmed based on chloride level, pH, temperature, and chemical composition.

Can the machine be supplied as a complete skid?

Yes. We can provide the centrifuge together with feed pump, polymer dosing unit, control cabinet, sludge tank, conveyor, and skid-mounted accessories if required.

To recommend a suitable model, please share:

• Sludge source
• Capacity requirement
• Solids content
• pH value
• Salt or chloride content
• Heavy metal type and concentration
• Polymer dosing condition, if any
• Target cake dryness or liquid clarity
• Operating hours
• Material or corrosion requirements
• Site voltage or control preference

Our engineering team can suggest a suitable two-phase decanter centrifuge configuration based on your chemical sludge dewatering project.

Contact Peony for Partnership

If you have local customer channels or project resources in chemical sludge, electroplating sludge, pharmaceutical wastewater sludge, power plant FGD wastewater sludge, high-salinity sludge, or heavy metal wastewater treatment, peony welcomes cooperation.

Send us your target market, customer type, project background, and cooperation proposal. Our team will evaluate the opportunity and provide technical and commercial support for suitable projects.