Add/Improve Coarse Solids Separation

Overview

Enhancing coarse solids separation is essential for effective manure management and optimizing overall farm operations. By adding or upgrading equipment to separate solids from liquids, farms can increase efficiency, reduce labor costs, and minimize environmental impacts. Proper separation not only improves resource recovery by repurposing solids for bedding or compost but also reduces nutrient runoff and debris in the manure, making it easier to handle. Additionally, this process enhances the quality of recycled water and reduces lagoon size and load, allowing for more strategic and efficient nutrient placement across fields.

Reference: NRCS Practice Standard 632: Waste Separation Facility

Environmental Impact

• Reduced GHG emissions (12.7-30.4 MTCO2e/year⁶)
• Improved waste separation efficiency
• Enhanced air and water quality
• Improved nutrient utilization
• Reduced solids accumulation in waste storage ponds
• Reduced use of commercial fertilizers

Greenhouse Gas Reduction

Estimated Cost

Vibratory or Rotating Screen:

Scenario Unit: Each

Scenario Typical Size: 1 unit

Total Cost/Unit: $69,604/unit

Reference: NRCS Practice Standard and Scenario: CPS 632 Waste Separation Facility Scenario #1 – Separator, Vibratory or Rotating Screen: https://www.nrcs.usda.gov/sites/default/files/2024-11/fy25-wa-scenarios.pdf, p. 1237.

 

Screw or Roller Press:

Scenario Unit: Each

Scenario Typical Size: 1 unit

Total Cost/Unit: $62,280.67/unit

Reference: NRCS Practice Standard and Scenario: CPS 632 Waste Separation Facility Scenario #2 – Separator, Screw or Roller Press: https://www.nrcs.usda.gov/sites/default/files/2024-11/fy25-wa-scenarios.pdf, p. 1238.

Financial Considerations

Cost Savings: Implementing or improving solid-liquid separation can result in significant cost savings by reducing the volume of manure to handle and store, lowering transportation and lagoon maintenance costs. This process also decreases equipment wear and tear by removing debris, reducing repair and replacement expenses. Separated solids can be repurposed as compost, soil amendments, or bedding, cutting down the need to buy and transport additional materials. The liquid effluent can be used as fertilizer, reducing the need to purchase commercial fertilizers.
Additional Revenue: The separated solids can also be sold as compost, soil amendments, or bedding, providing a potential source of added revenue to the farm.
Carbon Credit Potential: Solid-liquid separation serves as a prerequisite for many downstream manure treatments, such as cap and flare systems and nutrient recovery, which can generate carbon credits by reducing GHG emissions. Additionally, the separation of coarse solids itself can qualify for carbon credits, as it directly mitigates emissions by reducing the volume of organic material in manure that decomposes anaerobically.

Timeline

Short

Dependency / Prerequisite

Prerequisites:

• If sand is used as bedding, it is essential to remove the sand from the manure before it enters the separation system. This step is crucial to prevent rapid wear and tear on the separation equipment, which can lead to increased maintenance costs and reduced efficiency. Proper sand removal helps extend the lifespan of the equipment and ensures smoother operation.
• Ensure that there is sufficient storage capacity for both solid and liquid fractions resulting from the separation process. Proper storage is vital for the sustainable management of these materials, allowing for effective handling, treatment, and application.
• Waste separation facilities should be covered to protect them from freezing temperatures and adverse weather conditions. This precaution is necessary to prevent potential damage to the equipment, ensuring its longevity and effective operation.