Microfiltration of gluten processing streams from corn wet milling.

Area of Science:

• Agricultural Science
• Chemical Engineering
• Food Science

Background:

• Corn wet milling separates dry matter from liquids using centrifuges or vacuum belt filtration (VBF).
• Incomplete separation leads to nutrient loss (especially protein) and reduced water quality for recycling.
• Conventional methods result in dry matter loss in liquid streams, impacting coproduct value.

Purpose of the Study:

• To compare microfiltration with conventional methods (centrifugation and VBF) for separating light and heavy gluten streams.
• To evaluate the effectiveness of microfiltration in partitioning solids and water.
• To assess the impact of microfiltration on nutrient recovery and coproduct quality.

Main Methods:

• Light and heavy gluten streams were obtained from a corn wet mill.
• Microfiltration was applied to these gluten streams.
• Permeate and concentrate from microfiltration were analyzed and compared to conventionally processed streams.

Main Results:

• Microfiltration of light gluten yielded results comparable to centrifugation.
• Conventional VBF achieved higher dry matter concentration in heavy gluten cake than microfiltration concentrate.
• Microfiltration permeate from heavy gluten had higher ash and lower soluble nitrogen than VBF filtrate.
• Microfiltration demonstrated potential for increased ash removal from concentrate.

Conclusions:

• Microfiltration is a viable alternative for separating light gluten streams, performing comparably to centrifugation.
• For heavy gluten, microfiltration offers potential advantages in ash removal, possibly enhancing coproduct value.
• Further investigation is required to determine the overall effectiveness and practicality of microfiltration in corn wet milling.