Brewing beer also generates a significant amount of Brewer’s Spent Grain (BSG). This organic by-product contains valuable fiber and nutrients, but its high moisture content can create challenges for brewery waste management.

Typical issues include:

• High moisture content
• Increased transportation weight
• Large storage volume
• Rapid fermentation and spoilage
• Higher waste handling costs

For breweries seeking better waste management and resource utilization, efficient spent grain dewatering can provide a practical solution.

What Happens to Spent Grain After Brewing?

During mashing and lautering, the useful soluble components are separated from the malt, leaving behind a fibrous solid material known as spent grain.

Fresh BSG commonly contains approximately 75%–85% moisture, although the actual level varies according to the brewing process and material characteristics.

When this wet material is transported or stored directly, its high water content increases weight and volume while also making long-term storage more difficult.

Mechanical dewatering can help remove part of this excess water before the next stage.

Common Methods for Spent Grain Dewatering

1. Natural Drainage

Gravity drainage is a simple method with low equipment requirements. However, the amount of water removed is limited, and the process may require significant space and residence time.

For breweries with higher production volumes, natural drainage alone may not provide sufficient dewatering performance.

2. Centrifugal Dewatering

Centrifugal systems use high-speed rotation to separate liquid from solids.

They can provide fast processing, but may involve higher energy consumption, more complex mechanical components, and greater maintenance requirements.

3. Screw Press Dewatering

A Screw Press Dewatering Machine provides continuous mechanical separation and is widely suitable for high-moisture organic materials.

Wet spent grain enters through the feed hopper and is transported forward by the rotating screw. As the material moves through the screen chamber, compression pressure gradually increases toward the discharge section.

Liquid is forced through the screen while the solid fraction continues toward the outlet.

The basic process can be summarized as:

Wet Spent Grain → Screw Conveying → Mechanical Compression → Liquid Separation → Dewatered BSG

The resulting material can then be considered for further applications such as:

• Animal feed
• Compost and organic fertilizer
• Further drying and processing
• Anaerobic digestion and biogas production
• Lower-moisture transportation and storage

Choosing the right dewatering equipment requires more than comparing the initial purchase price.

1. Processing Capacity

Determine the actual BSG production rate per hour or per day. Equipment should be selected according to the required processing capacity, including reasonable allowance for production peaks and future expansion.

2. Required Final Moisture

The target moisture content depends on the intended use of the dewatered material.

For example, requirements may differ when the material is intended for animal feed, further drying, biogas production, or composting.

Testing with the actual spent grain is therefore an important part of equipment selection.

3. Operating Stability and Energy Consumption

Breweries may operate dewatering equipment for extended periods. Stable operation, reasonable power consumption, and reliable mechanical components are important for controlling long-term operating costs.

4. Cleaning and Maintenance

Spent grain is a wet organic material, making convenient cleaning and maintenance essential.

When evaluating equipment, breweries should consider:

• Screen removal and cleaning
• Replacement of wear parts
• Lubrication access
• Discharge pressure adjustment
• Spare parts availability
• Technical support

5. Total Cost of Ownership

The overall investment should include more than the machine price.

A complete evaluation should consider:

Equipment + Installation + Electricity + Maintenance + Labor + Spare Parts

This approach provides a more accurate understanding of long-term operating costs.

Improving Brewery Spent Grain Resource Recovery

Brewer’s spent grain does not have to be treated only as a waste material.

With suitable dewatering and handling technology, breweries can reduce the amount of excess water before transportation or further processing. This can improve material handling efficiency while creating more opportunities for resource utilization.

Brewery → Spent Grain → Screw Press → Dewatered BSG → Further Utilization

For breweries handling large quantities of wet spent grain, an appropriate screw press system can help reduce handling pressure, improve transportation efficiency, and support more sustainable by-product management.

Contact Huatao Group

Email: team2@huataogroup.com
Tel / WhatsApp / WeChat: +86 17732852676

Contact us with your spent grain type, moisture content, and processing capacity for technical information and a suitable dewatering solution.

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