Thin Stillage

Graver Technologies provides filtration technologies for fermentation processes such as venting, concentration and microbial control used for thin stillage.

Innovative Technologies for Fermentaion Processes

By fermenting the sugars from biomass feedstock such as corn, wheat, barley, rye, sugar cane, or sugar beets, ethanol is produced. It may be a key ingredient to the final product such as for beer and wine, but in other instances, it is recovered by distillation for whiskey and other distilled spirits. Fermentation requires good manufacturing practices to mitigate the risk of microbial contamination throughout the process to the final packaging. The use of filters for venting or feeding air, sterile filtration of water, and other key additives are essential. Where distillation is used, the remaining biomass, known as stillage, is usually converted into animal feed due to the high protein content and collected through centrifugation. Thin Stillage, the dissolved solids after centrifugation, are commonly concentrated utilizing evaporation. Alternate technology such as crossflow membranes can economically concentrate these remaining solids and other miscellaneous materials to yield a clear permeate requiring significantly less energy and improved recovery.

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About Graver's Products For Thin Stillage

Concentration of thin stillage requiring significantly less energy with improved recovery over evaporative methods
Microbial and particle control for vents or feed air
Final filters for removal of microbial contaminants in feedstock
Particle control for rinse water and CIP processes

Product Selection

ZTEC™ WB Membrane filters provide bacterial removal and microbial stabilization
TefTEC™ V - for sterile air feed using 0.2 micron hydrophobic PTFE membrane
Scepter® - Stainless Steel crossflow for high solids biomass
WaterTEC™ - for high level particle control of rinse water.
Scepter® - Stainless Steel crossflow for high solids biomass

Frequenty Asked Questions

How often should gas turbine filters be replaced?

This depends on the environment and filter type; however, pre-filters are changed every 3–6 months, while final filters may bechanged once in a year or two. Monitoring pressure drop is key to determiningreplacement timing.

What factors affect the operating life of a gas turbine filter?

Here are some factors:

Ambient dustand pollution levels
Operatinghours and load
Pulse-cleaningfrequency, depending on the type
Humidity andmoisture
Filter mediaand design

How do I know when a filter needs to be changed?

Differential pressure across the filter is animportant aspect in this case. If it increases beyond the set threshold, thefilter may be clogged or need cleaning or replacement.

What is pressure drop and why does it matter?

Pressure drop is the resistance to airflow through afilter. A high-pressure drop reduces turbine efficiency and increases energycosts. Selecting low-resistance filters helps improve performance.