Dolphin Centrifuge

Manure Centrifuge | Benefits, Specs & Operation

Sharples P3000 Wastewater Decanter
Sharples P3000 Manure Decanter

Table of Contents

Manure handling and disposal in the livestock industry is one of the critical factors affecting cost and viability in a highly competitive market.

Effective waste handling can bring higher revenues from a previously resource-intensive operating expense.

Why Separate Manure?

The separation of manure into its solid and liquid components is important for two reasons.

Firstly, the value of dry manure is much more than that of the wetter kind.

Secondly, dry manure solids' transportation is practical and cost-effective compared to manure cost with a large water percentage.

Besides, the solids' physical separation reduces the phosphorus, which is crucial for the separated water's disposal consideration.

Separation Process

The separation of manure is the process of fractionating the manure into its liquid and solid phases. Separated manure sludge yields more value as a fertilizer and is easy to transport.

The water separated from the manure is mostly free of solids and nutrients, making it suitable for disposal. Dewatering centrifuges play a critical role in this application.

Physical means of manure separation range from gravity separation in lagoons to media separation devices (presses) and mechanical separator centrifuges.

Though each separation method has a role in the livestock industry waste management, the decanter centrifuge is the most durable, cost-effective long-term solution. 

Manure Centrifuge Operation
Manure Centrifuge Diagram


A manure centrifuge separates manure solids from the water using high centrifugal forces over 3,000 Gs. The solids are heavier and settle out to the rotating bowl wall.

The relatively lighter water stays in the center and flows out the liquid end. The rotating conveyor scrapes the manure solids to the solids' end of the bowl.

It is important to note that most Phosphorus is bound to the solids and therefore ends up the separated solids. About 50% of the Nitrogen is retained in the liquid manure.

Introducing some chemical flocculants enhances the separation process, allowing smaller particles, less than 50 µm, to be separated.


The following are the specifications for a typical Alfa Laval decanter centrifuge for manure separation.

Processing Capacity25 GPM on Untreated Liquid Manure
Centrifuge TypeHorizontal, Scroll Type Decanter Centrifuge
Bowl Speed4,000 RPM
Centrifugal Force (RCF)3,150 Gs
Scroll Differential Speed6 ~ 50 RPM
Gear Box (Torque & Type)2.5 kN-M; Planetary 
Motor Power15 HP (11 kW)
Dimensions & Weight3' x 8' x 5' (H)   2,500 Lbs


Advantages Over Filter Press

Centrifuges offer many advantages over other mechanical separation devices like filter presses, belt presses, etc.


To get more details email us or call us at (248) 522-2573

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