World Grain - October 2008 - 61

BIOFUELS QUARTERLY: DDGS STORAGE AND HANDLING CHALLENGES

cepts utilized at ethanol plants in the
United States. They include flat storage,
automated vertical storage and a combination of both.
The flat storage concept simply requires a very large building. The flat
storage buildings are most common at
50-to-60-million-gallon-per-year ethanol plants. The DDGS is pushed or carried to receiving hoppers in the building floor and then conveyed to loadout
equipment. The main advantage of a
flat storage building is that it adequately
addresses the curing issue and may require less upfront investment than other
options. A disadvantage is that flat storage buildings are very labor intensive,
requiring front end loaders or other such
equipment to move material, a process
that can result in lower than desired
loadout rates.
The method of DDGS storage that
is most common at ethanol plants pro-

ducing in excess of 100 million gallons
(378.5 million liters) per year is automated vertical storage, where DDGS is
stored in a specially designed silo and

The method of DDGS storage
that is most common at ethanol plants producing in excess
of 100 million gallons a year is
automated vertical storage.

uses a heavy-duty reclaim auger.
Perhaps the biggest advantage of a
vertical storage system is the capability of large automated loadout rates.
The automated feature will reduce labor
costs associated with front end loader
operators. It also addresses the safety
concerns of having those operators work
in dusty building conditions.

One disadvantage of vertical storage
systems is that they may involve more
upfront capital cost. Also, a separate
building is needed if a plant operator believes a curing process is required.
An issue often raised about the vertical storage concept involves the ability to send material directly to the silo.
There are plants that send DDGS directly to the storage silo, skipping the curing portion. However, a small flat pad
is commonly used at ethanol plants for
certain conditions, such as during plant
startups, when initial DDGS production
may not be to specifications.
The third material storage and handling concept is a combination of both
flat storage and automated vertical storage. This is most commonly seen at
plant expansions where flat storage exists and advantages are seen in adding
a silo versus adding another building.
This method takes advantage of the fast,

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62

October 2008 / World Grain / www.World-Grain.com



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World Grain - October 2008

Table of Contents for the Digital Edition of World Grain - October 2008

Contents
World Grain - October 2008 - 1
World Grain - October 2008 - 2
World Grain - October 2008 - 3
World Grain - October 2008 - Contents
World Grain - October 2008 - 5
World Grain - October 2008 - 6
World Grain - October 2008 - 7
World Grain - October 2008 - 8
World Grain - October 2008 - 9
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