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Proper effluent management leads to lower maintenance costs for equipment and reduces ongoing fertiliser costs.

Other benefits include:

  • Soil moisture retaining properties
  • Improved nutrient volume
  • Indirect productivity improvements

How Effluent Management Affects Milk Production Costs

Farm profits are greatly affected by nutrients and nutrient management. When the balance between soil and fertiliser management occurs, many farmers find that they can produce more feed with no extra costs involved. Strategic fertiliser management becomes a key tool for farmers, with effluent management being a crucial piece for all dairy farm businesses.

Advantages of proper effluent management

  • Reduce costs for purchased fertilisers
  • Improve soil conditioning from organic matter
  • Increase the soils’ moisture capacity
  • Increase nutrient retaining capacity

Solid/Liquid Separation Systems

With the challenges faced by dairy farmers that own large herds, effluent management is particularly important. This separation process of removing the solids out of the effluent stream provides increased reliability in the effluent system and decreases the accumulation of sludge in the farms’ effluent ponds.

Benefits of installing a solid/liquid separation system

  • Reduce blockages in pumps and pipes
  • Reduce the sludge accumulation rate in effluent ponds
  • Utilise standard irrigation equipment for effluent distribution
  • Concentrates organic matter into one location for direct-to-pasture application
  • Reduce maintenance costs of paddocks through recycling manure solids into fertiliser

Types of Solid/Liquid Separation Systems

  • Rotary drum separators
  • Roll press separators
  • Slope screen separators
  • Centrifuges
  • Screw press separators

Screw Press Separator Systems

Screw press separator systems like McLanahan Corporation’s Screw Press Separator, operate through using an auger to compress the solids within a cylinder.

Why should you separate your manure?

While raw manure handling is not a priority for farmers during production, it can prove to be detrimental to animal herd health causing disease and environmental hazards if not separated and stored correctly.
Raw manure also tends to be a difficult material to handle and transport due to its thick, fibrous contents. With increasing farm densities, using a screw press separator can reduce land requirements needed to
process large volumes of effluent by separating solids and liquids into stackable, product and nutrient-rich liquids for your soil.

Advantages to separating manure solids can also include:

  • Solids can be sold as fertiliser after the composting period
  • Solids can be used as animal bedding material – reclaim up to 80% of bedding with this method
  • Separated nutrient rich liquids can be irrigated or used as flushing recycled water without risk of system blockages
  • Land usage can be reduced since settling ponds can be smaller

Why Separate with a McLanahan Screw Press Separator?

In the manure liquid solid separation marketplace, there are many pieces of equipment that can provide a dewatering solution for manure (slope screens separators, rotary drum separators etc).

However, the McLanahan Screw Press Separator achieves high levels of dryness due to the fact that there is a “pressing” effect pushing down on the manure. The screw press separator utilises minimal energy input to press out the liquid fraction of manure to achieve a quality dried product.

Operational and maintenance requirements are relatively small due to the automated operation of the screw press system. With McLanahan Corporation’s 180 years of experience in the agricultural environment,
we focus on incorporating automatic lubrication systems and heavyduty sealing systems to protect important rotating parts such as the gearbox and motor.

Advantages of the McLanahan Screw Press Separator include:

  • Screen aperture sizes of 0.25mm – 1.0mm
  • Heavy-duty, non-blinding wedge wire screen
  • Hardened screw surface for durability
  • Powerful and efficient 5.5kW motor
  • Mine-grade heavy-duty driveshaft seal for leak protection
  • Easy maintenance and serviceability
  • ISO 9001-2015 Certified

How does the McLanahan Screw Press Separator work?

The McLanahan Screw Press Separator uses a helical screw conveyor with specially-plated hardened surfaces for durability and long service life. The screw conveyor transfers wet manure fibre through a heavyduty
cylindrical wedge-wire screen. During transfer, the manure is pressed against adjustable outlet port paddles and the outlet port design allows for fine-tuning of the manure fibre dryness. This is possible by moving the port paddle counterweights to increase or decrease manure squeezing pressures.

During operation, manure fibre is continually being pushed forward into the outlet port paddles, allowing the pressure to squeeze out the liquid portion of the manure. This liquid portion then passes through the
cylindrical wedge-wire screen for discharge to the effluent system- free of solids.

Manure can be transferred to the system either by slurry pumping or mechanical auger/belt feeding depending on total solids content. McLanahan Corporation’s wedge-wire screens are designed and developed with anti-blocking (blinding) slot sizes. Available product slot sizes can vary from 0.25mm to 1.0mm depending on applications and dewatering requirements.

For large throughput systems, the screw press machines can be either utilised in parallel or in series if fine particle removal is required.


Meet the author

Andrew Lenehan

Andrew is the Technical Sales Specialist for Agriculture.

Andrew provides consultations and manages sales for Sand Manure Separators, Liquid Solid Separators, Rotary Bedding Dryers and Manure Augers, particularly for dairy operations.

For any information relating to our services or to arrange a consultation onsite, please contact Andrew.

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