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Call to Action for a Truly Sustainable Renewable Future
August 8, 2013 – 5:07 pm | No Comment

-Include high octane/high ethanol Regular Grade fuel in EPA Tier 3 regulations.
-Use a dedicated, self-reducing non-renewable carbon user fee to fund renewable energy R&D.
-Start an Apollo-type program to bring New Ideas to sustainable biofuel and …

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Running Hot: 7 Tips for Warm Weather Ethanol Fermentation

Submitted by on September 6, 2017 – 12:57 pmNo Comment

by Claudia Geddes (Novozymes)  As you know, heat—and its partner in crime, humidity—can be a stressor on the yeast used in ethanol fermentation, affecting both yeast health and performance. Unfortunately, this often makes yeast a bottleneck for plants, as not all plants have the cooling capacity to account for peak summer production rates at the highest possible sugar levels.

Of course, not all yeasts are created equal, and some are better suited to withstand adverse process conditions. Nonetheless, there are still steps that can be taken to maintain (or improve) the health of even the most robust yeast, despite these higher temperatures.

Effectively dealing with temperature stress

The easiest way to reduce fermentation temperature is to reduce the sugar level going into fermentation. This, however, is a tradeoff that reduces yeast growth and activity. Temperature staging, where the temperature is gradually reduced to lower levels than typical later in fermentation, can also help lighten stress and avoid premature yeast death.

Here are seven more common strategies to beat the heat and achieve good fermentations:

1. Chiller inspection

2. Prepare for increased copper levels

3. Allocate chilled water resources

4. Standardize chiller water allocation procedure

5. Avoid repeatedly turning chiller on and off

6. Decrease corn solids loading

7. Monitor supplemental nitrogen

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