Environmental Engineering Reference
In-Depth Information
Table 3.
Table 5.
Criteria Values
1
< 45 gallons of ethanol per bone dry ton
2 46 - 50 gallons of ethanol per bone dry ton
3
51 - 60 gallons of ethanol per bone dry ton
4 61 - 65 gallons of ethanol per bone dry ton
5 > 65 gallons of ethanol per bone dry ton
Criteria Values
1
Feedstock in unavailable during some months
2 Very major monthly variation
3
Noticeable monthly variation
4 Very minor monthly variation
5 No appreciable monthly variation
Table 4.
Table 6.
Criteria Values
1
< 100,000 bone dry tons
2 100,000 - 499,000 bone dry tons
3
500,000 - 999,000 bone dry tons
4 1,000,000 - 2,000,000 bone dry tons
5 > 2,000,000 bone dry tons
Criteria Values
1
> $40 per bone dry ton
2 $31 - $40 per bone dry ton
3
$21 - $30 per bone dry ton
4 $11 - $20 per bone dry ton
5 $0 - $10 per bone dry ton
Table 7.
A description and relative weighting of each of
these criteria follows (Tables 3, 4, 5, 6 and 7).
Criteria Values
1
Competing industry consumes all at higher price
2 Competing industry, pays higher price
3
Competing industry, pays similar price
4 Competing industry, pays lower price
5 No competing industries
Yield (10 pts)
Yield is defined as the number of gallons of etha-
nol produced from a single bone dry ton of raw
material. This is an important number, because
it represents the efficiency that is realized from
using a particular biomass as raw material. Higher
yields are better. Yield only has a minor affect on
overall cost and supply, so it is weighted at ten
points (Table 3).
Feedrate (10 pts)
Feedrate is defined as variability from month to
month in the amounts of raw material available.
This is a qualitative criteria based on observations
of seasonal variation for a particular raw material.
Feedrate potentially affects the available supply
of ethanol from the supply chain, but can be miti-
gated through storage of either the raw materials
or ethanol. Given the possibility of mitigation,
feedrate is weighted at ten points (Table 5).
Availability (40 pts)
Availability is defined as the total amounts of a
raw material available annually in bone dry tons.
This is very important, because it potentially limits
the available supply of ethanol from the supply
chain. If this supply is not able to meet the market
demand, then the supply chain is not effective.
Given this major affect on supply, availability is
weighted at forty points (Table 4).
Collection (10 pts)
Collection is defined as potential costs in dollars
of collecting raw materials for use as cellulosic
feedstock. This criteria includes all costs necessary
